阅读说明：本技术 离网型混合供电控制系统、方法及装置 (Off-grid hybrid power supply control system, method and device ) 是由 路广宁 任丽娜 兰云海 梁晶晶 于 2020-05-15 设计创作，主要内容包括：本申请提供了一种离网型混合供电控制系统、方法及装置,涉及电力技术领域。该离网型混合供电控制系统,包括：柴油发电机、储能设备及控制器；其中,柴油发电机通过第一开关与交流母线连接,储能设备通过第二开关与交流母线连接,交流母线与负载连接；控制器用于获取负载的功率,根据负载的功率与至少一个预设负载功率范围,控制第一开关和第二开关闭合或断开,以控制柴油发电机和/或储能设备与交流母线连通,为负载供电。利用本申请的技术方案能够提高柴油发电机的供电稳定性。(The application provides an off-grid hybrid power supply control system, method and device, and relates to the technical field of electric power. This off-grid hybrid power supply control system includes: the system comprises a diesel generator, energy storage equipment and a controller; the diesel generator is connected with an alternating current bus through a first switch, the energy storage equipment is connected with the alternating current bus through a second switch, and the alternating current bus is connected with a load; the controller is used for obtaining the power of the load, and controlling the first switch and the second switch to be switched on or switched off according to the power of the load and at least one preset load power range so as to control the diesel generator and/or the energy storage device to be communicated with the alternating current bus and supply power to the load. The technical scheme of this application can improve diesel generator's power supply stability.)

1. An off-grid hybrid power supply control system, comprising: the system comprises a diesel generator, energy storage equipment and a controller; wherein the content of the first and second substances,

the diesel generator is connected with an alternating current bus through a first switch, the energy storage equipment is connected with the alternating current bus through a second switch, and the alternating current bus is connected with the load;

the controller is used for obtaining the power of the load, and controlling the first switch and the second switch to be switched on or switched off according to the power of the load and at least one preset load power range so as to control the diesel generator and/or the energy storage device to be communicated with the alternating current bus and supply power to the load.

2. The off-grid hybrid power supply control system according to claim 1, wherein the controller is disposed in the energy storage device, and the controller is connected to the first coil and the second coil, and is further configured to control the first coil and/or the second coil to be powered on or powered off;

wherein the first switch is closed when the first coil is energized; when the first coil loses power, the first switch is switched off;

when the second coil is electrified, the second switch is closed; when the second coil loses power, the second switch is disconnected.

3. The off-grid hybrid power supply control system of claim 1, wherein the controller is specifically configured to:

when the power of the load is in a first preset load power range, controlling the first switch to be switched off, and controlling the second switch to be switched on, so that the energy storage device supplies power to the load through the alternating current bus;

when the power of the load is in a second preset load power range, controlling the first switch to be closed, and closing the second switch to enable the diesel generator to supply power to the load through the alternating current bus and charge the energy storage device through the alternating current bus;

when the power of the load is in a third preset load power range, controlling the first switch to be closed and the second switch to be opened, so that the diesel generator supplies power to the load through the alternating current bus;

the lower limit value of the second preset load power range is greater than the upper limit value of the first preset load power range, and the lower limit value of the third preset load power range is greater than the upper limit value of the second preset load power range.

4. The off-grid hybrid power supply control system of claim 3, wherein the controller is further configured to:

before switching from controlling the diesel generator to supply power to the load to controlling the energy storage device to supply power to the load, or switching from controlling the energy storage device to supply power to the load to control the diesel generator to supply power to the load, power transmission parameters are acquired from the diesel generator and the energy storage device respectively, and the power transmission parameters of the energy storage device are synchronized with the power transmission parameters of the diesel generator.

5. The off-grid hybrid power supply control system of claim 4, wherein the power transmission parameters comprise voltage magnitude and phase.

6. The off-grid hybrid power supply control system of claim 1, further comprising:

the load is connected with the alternating current bus through a third switch.

7. A control method of an off-grid hybrid power supply control system, which is applied to the off-grid hybrid power supply control system according to any one of claims 1 to 6, the method comprising:

acquiring the power of the load;

and controlling the first switch and the second switch to be switched on or switched off according to the power of the load and at least one preset load power range so as to control the diesel generator and/or the alternating current bus to be communicated with the alternating current bus.

8. The method of claim 7, wherein the controlling the first switch and the second switch to be closed or opened according to the power of the load and at least one preset load power range comprises:

when the power of the load is within a first preset load power range, controlling the first switch to be switched off, and controlling the second switch to be switched on, so that the energy storage device supplies power to the load through the alternating current bus;

when the power of the load is within a second preset load power range, controlling the first switch to be closed, and closing the second switch to enable the diesel generator to supply power to the load through the alternating current bus and charge the energy storage device through the alternating current bus;

when the power of the load is in a third preset load power range, controlling the first switch to be closed and the second switch to be opened so that the diesel generator supplies power to the load through the alternating current bus;

the lower limit value of the second preset load power range is greater than the upper limit value of the first preset load power range, and the lower limit value of the third preset load power range is greater than the upper limit value of the second preset load power range.

9. The method of claim 7, further comprising:

before switching from controlling the diesel generator to supply power to the load to controlling the energy storage device to supply power to the load, or switching from controlling the energy storage device to supply power to the load to control the diesel generator to supply power to the load, power transmission parameters are acquired from the diesel generator and the energy storage device respectively, and the power transmission parameters of the energy storage device are synchronized with the power transmission parameters of the diesel generator.

10. The method of claim 9, wherein the power transmission parameters include voltage magnitude and phase.

11. A control apparatus of an off-grid hybrid power supply control system, comprising a processor, a memory, and a program or instructions stored on the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the control method of the off-grid hybrid power supply control system according to any one of claims 7 to 10.

Technical Field

The application belongs to the technical field of electric power, and particularly relates to an off-grid hybrid power supply control system, method and device.

Background

With the rapid development of science and technology, the demand for energy in various fields is gradually increased. In some sparsely populated areas, remote areas, or special electricity usage situations, it is difficult to supply power completely. In order to solve the problem that the power is difficult to supply, a diesel generator can be adopted for supplying power.

The diesel generator is power mechanical equipment which takes diesel oil and the like as fuel and drives the generator to generate electricity by the diesel generator. Because the load of diesel generator power supply can change, can not guarantee that diesel generator moves with steady state, lead to diesel generator's power supply poor stability.

Disclosure of Invention

The embodiment of the application provides an off-grid hybrid power supply control system, method and device, which can improve the power supply stability of a diesel generator.

In a first aspect, an embodiment of the present application provides an off-grid hybrid power supply control system, including: the system comprises a diesel generator, energy storage equipment and a controller; the diesel generator is connected with an alternating current bus through a first switch, the energy storage equipment is connected with the alternating current bus through a second switch, and the alternating current bus is connected with a load; the controller is used for obtaining the power of the load, and controlling the first switch and the second switch to be switched on or switched off according to the power of the load and at least one preset load power range so as to control the diesel generator and/or the energy storage device to be communicated with the alternating current bus and supply power to the load.

In some possible embodiments, a controller is disposed in the energy storage device, and the controller is connected to the first coil and the second coil respectively, and is further configured to control the first coil and/or the second coil to be powered on or powered off; when the first coil is electrified, the first switch is closed; when the first coil loses power, the first switch is switched off; when the second coil is electrified, the second switch is closed; when the second coil loses power, the second switch is disconnected.

In some possible embodiments, the controller is specifically configured to: when the power of the load is in a first preset load power range, the first switch is controlled to be switched off, and the second switch is controlled to be switched on, so that the energy storage equipment supplies power to the load through the alternating current bus; when the power of the load is in a second preset load power range, controlling the first switch to be closed and the second switch to be closed so that the diesel generator supplies power to the load through the alternating current bus and charges the energy storage equipment through the alternating current bus; when the power of the load is in a third preset load power range, controlling the first switch to be closed and the second switch to be opened, so that the diesel generator supplies power to the load through the alternating current bus; the lower limit value of the second preset load power range is larger than the upper limit value of the first preset load power range, and the lower limit value of the third preset load power range is larger than the upper limit value of the second preset load power range.

In some possible embodiments, the controller is further configured to: before switching from controlling the diesel generator to supply power to the load to controlling the energy storage device to supply power to the load, or switching from controlling the energy storage device to supply power to the load to controlling the diesel generator to supply power to the load, power transmission parameters are acquired from the diesel generator and the energy storage device respectively, and the power transmission parameters of the energy storage device are synchronized with the power transmission parameters of the diesel generator.

In some possible embodiments, the power transmission parameters include voltage magnitude and phase.

In some possible embodiments, the off-grid hybrid power supply control system further includes: and the load is connected with the alternating current bus through the third switch.

In a second aspect, an embodiment of the present application provides a control method for an off-grid hybrid power supply control system, which is applied to the off-grid hybrid power supply control system in the technical solution of the first aspect, and the method includes: acquiring the power of a load; and controlling the first switch and the second switch to be switched on or switched off according to the power of the load and at least one preset load power range so as to control the diesel generator and/or the alternating current bus to be communicated with the alternating current bus.

In some possible embodiments, controlling the first switch and the second switch to be closed or opened according to the power of the load and at least one preset load power range includes: when the power of the load is within a first preset load power range, controlling the first switch to be switched off and the second switch to be switched on so that the energy storage equipment supplies power to the load through the alternating current bus; when the power of the load is within a second preset load power range, controlling the first switch to be closed and the second switch to be closed so that the diesel generator supplies power to the load through the alternating current bus and charges the energy storage equipment through the alternating current bus; when the power of the load is within a third preset load power range, controlling the first switch to be closed and the second switch to be opened so that the diesel generator supplies power to the load through the alternating current bus; the lower limit value of the second preset load power range is larger than the upper limit value of the first preset load power range, and the lower limit value of the third preset load power range is larger than the upper limit value of the second preset load power range.

In some possible embodiments, the method further comprises: before switching from controlling the diesel generator to supply power to the load to controlling the energy storage device to supply power to the load, or switching from controlling the energy storage device to supply power to the load to controlling the diesel generator to supply power to the load, power transmission parameters are acquired from the diesel generator and the energy storage device respectively, and the power transmission parameters of the energy storage device are synchronized with the power transmission parameters of the diesel generator.

In some possible embodiments, the power transmission parameters include voltage magnitude and phase.

In a third aspect, an embodiment of the present application provides a control device of an off-grid hybrid power supply control system, including a processor, a memory, and a program or an instruction stored in the memory and executable on the processor, where the program or the instruction is executed by the processor to implement the control method of the off-grid hybrid power supply control system in the technical solution of the second aspect.

The embodiment of the application provides an off-grid hybrid power supply control system, method and device, wherein a diesel generator is connected with an alternating current bus through a first switch. The energy storage device is connected with the alternating current bus through the second switch. The ac bus is connected to a load. The controller can control the on-off states of the first switch and the second switch according to the obtained power of the load and a preset load power range so as to control the diesel generator and/or the energy storage device to be communicated with the alternating current bus and supply power to the load. Under the condition that the power of the load is different, the energy storage device can be introduced to supply power to the load, frequent output change of the diesel generator in the operation process is avoided, and under the condition that the energy storage device can supply power to the load, the diesel generator can keep stable output, so that the power supply stability of the diesel generator is improved.

Drawings

The present application will be better understood from the following description of specific embodiments of the invention taken in conjunction with the accompanying drawings. Wherein like or similar reference numerals refer to like or similar features.

Fig. 1 is a schematic structural diagram of an off-grid hybrid power supply control system according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of an off-grid hybrid power supply control system according to another embodiment of the present application;

fig. 3 is a flowchart of a control method of an off-grid hybrid power supply control system according to an embodiment of the present application;

fig. 4 is a flowchart of a control method of an off-grid hybrid power supply control system according to another embodiment of the present application;

fig. 5 is a flowchart of a control method of an off-grid hybrid power supply control system according to another embodiment of the present application;

fig. 6 is a schematic structural diagram of a control device of an off-grid hybrid power supply control system according to an embodiment of the present application.

Detailed Description

Features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof. The present application is in no way limited to any specific configuration and algorithm set forth below, but rather covers any modification, replacement or improvement of elements, components or algorithms without departing from the spirit of the present application. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present application.

With the increase of the demand for energy, the construction of electric power is gradually developing. However, due to the high requirement and high cost of power grid distribution, power grid power supply cannot cover some sparsely populated areas, remote areas or special power utilization occasions. For example, a base station for communication in a remote area may be located on an open mountain top, and it is difficult for a power grid to cover the base station. The embodiment of the application provides an off-grid hybrid power supply control system, method and device, which can perform hybrid power supply on a load by using a diesel generator and energy storage equipment in an off-grid state, namely a non-grid-covered state. In this application embodiment off-grid type power supply control system, diesel generator can be in the operation of comparatively stable state, and power supply stability is higher.

Fig. 1 is a schematic structural diagram of an off-grid hybrid power supply control system according to an embodiment of the present application. As shown in fig. 1, the off-grid hybrid power supply control system may include a diesel generator 11, an energy storage device 12, and a controller 13.

The diesel generator 11 is connected to the ac bus 15 through a first switch K1. The energy storage device 12 is connected to the ac busbar 15 via a second switch K2. The ac busbar 15 is connected to the load 14.

The diesel generator 11 may be used to power a load 14 and also to charge the energy storage device 12. The energy storage device 12 is capable of storing electrical energy that may be used to power the load 14. Specifically, the energy storage device 12 may be a modular energy storage all-in-one machine. The load 14 requiring power may change, for example, during a certain period of time, the load 14 includes the electric device E1 requiring power and the electric device E2. In another time period, the load 14 includes powered device E1, powered device E2, and powered device E3 that require power.

The first switch K1 and the second switch K2 may be switching devices such as contact switches, and the types of the first switch K1 and the second switch K2 are not limited herein. For example, the first switch K1 and the second switch K2 may be contact switches such as contactors or relays.

The controller 13 may be a device independent of the energy storage device 12 and the diesel engine, or may be a device installed in the energy storage device 12, and is not limited herein. For example, the controller 13 may be an Energy Management Unit (EMU) installed in the Energy storage device 12. The controller 13 is configured to obtain power of the load 14, and control the first switch K1 and the second switch K2 to be closed or opened according to the power of the load 14 and at least one preset power range of the load 14, so as to control the diesel generator 11 and/or the energy storage device 12 to communicate with the ac bus 15 to supply power to the load 14. Specifically, the controller 13 may collect the power of the load 14 in real time, or collect the power voltage and the power current of the load 14 in real time, and calculate the power of the load 14 according to the power voltage and the power current, or obtain the power of the load 14 by using other methods, which is not limited herein.

When the first switch K1 is closed, the diesel generator 11 is communicated with the ac bus 15, and the diesel generator 11 can output electric energy to the ac bus 15 and transmit the electric energy through the ac bus 15. When the first switch K1 is opened, the diesel generator 11 and the ac bus 15 are turned off. When the second switch K2 is closed, the energy storage device 12 is in communication with the ac bus 15. In some cases, the energy storage device 12 may output electrical energy to the ac bus 15 for transmission through the ac bus 15. In other cases, the energy storage device 12 may also draw power from the ac bus 15 to charge itself.

The load 14 to be powered changes, so does the power of the load 14. Different preset load 14 power ranges correspond to different control strategies for controlling the first switch K1 and the second switch K2 to be closed or opened. The controller 13 can control the on-off states of the first switch K1 and the second switch K2 according to a preset load 14 power range in which the acquired power of the load 14 falls, so as to select the diesel generator 11 to supply power to the load 14; or, the energy storage device 12 is selected to supply power to the load 14; or, the diesel generator 11 is selected to supply power to the load 14 and charge the energy storage device 12; alternatively, the diesel generator 11 and the energy storage device 12 are selected to jointly supply power to the load 14, and the invention is not limited thereto.

In the present embodiment, the diesel generator 11 is connected to the ac bus 15 via the first switch K1. The energy storage device 12 is connected to the ac busbar 15 via a second switch K2. The ac busbar 15 is connected to the load 14. The controller 13 can control the on-off states of the first switch K1 and the second switch K2 according to the obtained power of the load 14 and the preset power range of the load 14, so as to control the diesel generator 11 and/or the energy storage device 12 to be communicated with the alternating current bus 15 to supply power to the load 14. Under the condition that the power of the load 14 is different, the energy storage device 12 can be introduced to supply power to the load 14, so that frequent output change of the diesel generator 11 in the operation process is avoided, and under the condition that the energy storage device 12 can supply power to the load 14, the diesel generator 11 can keep stable output, so that the power supply stability of the diesel generator 11 is improved.

Moreover, the power supply stability of the diesel generator 11 is improved, the power generation quality of the diesel generator 11 is improved, the aging speed of the diesel generator 11 can be reduced, and the service life of the diesel generator 11 is prolonged. In the case where the energy storage device 12 is capable of powering the load 14, the fuel consumption of the diesel engine may also be reduced.

Fig. 2 is a schematic structural diagram of an off-grid hybrid power supply control system according to another embodiment of the present application. As shown in fig. 2, the controller 13 is provided in the energy storage device 12. The controller 13 may be connected to the first coil D1 and the second coil D2, respectively. The controller 13 may be used to control the first coil D1 and/or the second coil D2 to be powered or de-powered. The off-grid power supply control system may also include a load 14. The load 14 may be connected to the ac busbar 15 by a third switch K3. When the third switch K3 is closed, the load 14 communicates with the ac busbar 15. It should be noted that, when the diesel generator 11 and/or the energy storage device 12 supplies power to the load 14, the third switch K3 is closed by default, and the description will not be repeated below.

The controller 13 may control the first switch K1 to be turned on or off by controlling the first coil D1 to be powered on or powered off. Specifically, when the first coil D1 is energized, the first switch K1 is closed. When the first coil D1 loses power, the first switch K1 is opened. The controller 13 may control the second switch K2 to be closed or opened by controlling the second coil D2 to be powered on or powered off. Specifically, when the second coil D2 is energized, the second switch K2 is closed. When the second coil D2 loses power, the second switch K2 is opened.

For example, the first switch K1 and the second switch K2 are both contact switches. When the first coil D1 is energized, the contacts of the first switch K1 attract each other, i.e., the first switch K1 is closed. When the first coil D1 loses power, the contacts of the first switch K1 are separated from each other, i.e., the first switch K1 is opened. Similarly, when the second coil D2 is powered, the contacts of the second switch K2 attract each other, that is, the second switch K2 is closed. When the second coil D2 loses power, the contacts of the second switch K2 are separated from each other, i.e., the second switch K2 is opened.

In some examples, the preset load 14 power ranges may include a first preset load 14 power range, a second preset load 14 power range, and a third preset load 14 power range. Wherein, the lower limit value of the power range of the second preset load 14 is greater than the upper limit value of the power range of the first preset load 14. The lower limit of the power range of the third preset load 14 is greater than the upper limit of the power range of the second preset load 14.

When the obtained power of the load 14 is within the first preset load 14 power range, the controller 13 controls the first switch K1 to be opened, and the second switch K2 to be closed, so that the energy storage device 12 is communicated with the ac bus 15, and the load 14 is supplied with power through the ac bus 15. Specifically, the controller 13 may also monitor the electric energy stored in the energy storage device 12, and when the obtained power of the load 14 is within a first preset power range of the load 14 and the electric energy stored in the energy storage device 12 is greater than a preset electric energy threshold, the controller 13 controls the first switch K1 to be opened and the second switch K2 to be closed. The first switch K1 is opened, the second switch K2 is closed, and the power output by the energy storage device 12 reaches the load 14 through the second switch K2, the ac bus 15 and the third switch K3.

In the first preset load 14 power range, the second preset load 14 power range and the third preset load 14 power range, the power value in the first preset load 14 power range is smaller than the power value in the second preset load 14 power range and the power value in the third preset load 14 power range. The output power of the diesel generator 11 is greater than the output power of the energy storage device 12. The power of the load 14 is within the first predetermined load 14 power range, which indicates that the power of the load 14 is less than or equal to the output power that can be provided by the energy storage device 12. That is, the first predetermined load 14 power range is a predetermined load 14 power range indicating that the power of the load 14 is less than or equal to the output power that can be provided by the energy storage device 12. When the power of the load 14 is within the power range of the first preset load 14, the energy storage device 12 can be controlled to supply power to the load 14, and the diesel generator 11 is not used to supply power to the load 14, so that the condition that the diesel generator 11 accelerates the aging of the diesel generator 11 by using the relatively low power output of the diesel generator 11 is avoided. The predetermined power threshold is a power threshold sufficient to power load 14. The energy storage device 12 stores more than a predetermined threshold amount of energy, indicating that the energy storage device 12 has sufficient energy to power the load 14.

When the power of the load 14 is in the second preset load 14 power range, the first switch K1 is controlled to be closed, and the second switch K2 is controlled to be closed, so that the diesel generator 11 supplies power to the load 14 through the alternating current bus 15, and charges the energy storage device 12 through the alternating current bus 15. The first switch K1 is closed, the second switch K2 is closed, and a part of the electric energy output by the diesel generator 11 reaches the energy storage device 12 through the first switch K1, the alternating current bus 15 and the second switch K2 to charge the energy storage device 12. Another part of the electric power output by the diesel generator 11 reaches the load 14 through the first switch K1, the ac bus 15 and the third switch K3.

In the first preset load 14 power range, the second preset load 14 power range and the third preset load 14 power range, the power value in the second preset load 14 power range is greater than the power value in the first preset load 14 power range and is less than the power value in the third preset load 14 power range. The output power of the diesel generator 11 is greater than the output power of the energy storage device 12. The power of the load 14 is within the second preset load 14 power range, which means that the power of the load 14 is greater than the output power that can be provided by the energy storage device 12 and less than the stable output power that can be provided by the diesel generator 11. That is, the second preset load 14 power range is a preset load 14 power range indicating that the power of the load 14 is greater than the output power that can be provided by the energy storage device 12 and less than the stable output power that can be provided by the diesel generator 11. The power of the load 14 is within the power range of the second preset load 14, in order to ensure that the diesel generator 11 can keep stable output power, the diesel generator 11 can supply power to the load 14 and charge the energy storage device 12 at the same time, the diesel generator 11 is fully utilized, the service efficiency of the diesel generator 11 is improved, the stable operation of the diesel generator 11 can also be ensured, the aging speed of the diesel generator 11 is reduced, the service life of the diesel generator 11 is prolonged, and the power supply stability of the diesel generator 11 is improved.

When the power of the load 14 is in the third preset load 14 power range, the first switch K1 is controlled to be closed, and the second switch K2 is controlled to be opened, so that the diesel generator 11 supplies power to the load 14 through the alternating current bus 15. The first switch K1 is closed, the second switch K2 is opened, and the electric power output by the diesel generator 11 reaches the load 14 through the first switch K1, the alternating current bus 15 and the third switch K3.

In the first preset load 14 power range, the second preset load 14 power range and the third preset load 14 power range, the power value in the third preset load 14 power range is greater than the power value in the first preset load 14 power range and the power value in the second preset load 14 power range. The output power of the diesel generator 11 is greater than the output power of the energy storage device 12. The power of the load 14 is within the third predetermined load 14 power range, which means that the power of the load 14 is smaller than the maximum output power provided by the diesel generator 11 and/or the stable output power provided by the diesel generator 11. That is, the third preset load 14 power range is a preset load 14 power range indicating that the power of the load 14 is smaller than the maximum output power that can be provided by the diesel generator 11 and/or the stable output power that can be provided by the diesel generator 11. The power of the load 14 is within the power range of the third preset load 14, the diesel generator 11 can be controlled to supply power to the load 14, the energy storage device 12 is not used for supplying power to the load 14, the device for supplying power to the load 14 can be flexibly adjusted, and the diesel generator 11 is fully used.

In the above embodiment, the operations of the diesel generator 11 and the energy storage device 12 are both off-grid operations. In some examples, there may be situations where the diesel generator 11 is not operational or the energy storage device 12 is not operational. When the diesel generator 11 fails to operate, for example, the diesel generator 11 fails to operate due to a fault, the controller 13 may control the first switch K1 to be opened and the second switch K2 to be closed, so that the energy storage device 12 supplies power to the load 14. When the energy storage device 12 fails to operate, for example, the energy storage device 12 fails to operate, the controller 13 may control the first switch K1 to be closed and the second switch K2 to be opened, so that the diesel generator 11 supplies power to the load 14.

During the operation of the off-grid hybrid power supply system, the power of the load 14 changes, and the controller 13 needs to switch from controlling the diesel generator 11 to supply power to the load 14 to control the energy storage device 12 to supply power to the load 14, or the controller 13 needs to switch from controlling the energy storage device 12 to supply power to the load 14 to control the diesel generator 11 to supply power to the load 14. In order to ensure that the power supply switching does not generate sudden change and can smoothly and seamlessly realize the switching, before the controller 13 switches from controlling the diesel generator 11 to supply power to the load 14 to control the energy storage device 12 to supply power to the load 14, or switches from controlling the energy storage device 12 to supply power to the load 14 to control the diesel generator 11 to supply power to the load 14, the controller 13 can respectively collect power transmission parameters from the diesel generator 11 and the energy storage device 12 and synchronize the power transmission parameters of the energy storage device 12 with the power transmission parameters of the diesel generator 11.

Specifically, a first power transmission parameter collection point may be set between the diesel generator 11 and the first switch K1, and the controller 13 collects the power transmission parameters of the diesel generator 11 from the first power transmission parameter collection point. A second power transmission parameter acquisition point may be provided between the energy storage device 12 and the second switch K2, from which the controller 13 acquires the power transmission parameters of the energy storage device 12. The number of the first power transmission parameter collection points may be set according to a power transmission line between the diesel generator 11 and the first switch K1, and the number of the second power transmission parameter collection points may be set according to a power transmission line between the energy storage device 12 and the second switch K2, which is not limited herein.

For example, as shown in fig. 2, first transmission parameter acquisition points a1, B1, C1 and N1 may be provided between diesel generator 11 and first switch K1, and second transmission parameter acquisition points a2, B2, C2 and N2 may be provided between energy storage device 12 and second switch K2. Controller 13 acquires output signals UA1, UB1, UC1 and UN1 from first power transmission parameter acquisition points a1, B1, C1 and N1, respectively, and acquires output signals UA2, UB2, UC2 and UN2 from second power transmission parameter acquisition points a2, B2, C2 and N2, respectively. The controller 13 can obtain the power transmission parameters of the diesel generator 11 according to the collected output signals UA1, UB1, UC1 and UN1, and the controller 13 can obtain the power transmission parameters of the energy storage device 12 according to the collected output signals UA2, UB2, UC2 and UN 2.

It should be noted that, the method for synchronously calculating the power transmission parameter of the energy storage device 12 and the power transmission parameter of the diesel generator 11 is not limited herein, for example, a phase-locked loop calculation method may be adopted to calculate a difference between the power transmission parameter of the energy storage device 12 and the power transmission parameter of the diesel generator 11, and adjust the power transmission parameter of the energy storage device 12 according to the difference until the difference between the power transmission parameter of the energy storage device 12 and the power transmission parameter of the diesel generator 11 is 0 or tends to 0, so as to complete synchronization between the power transmission parameter of the energy storage device 12 and the power transmission parameter of the diesel generator 11.

In some examples, the power transmission parameters include voltage magnitude and phase. The voltage amplitude may in particular be an effective value of the voltage. That is, the controller 13 synchronizes the voltage amplitude of the energy storage device 12 with the voltage amplitude of the diesel generator 11, and synchronizes the phase of the energy storage device 12 with the phase of the diesel generator 11. The voltage amplitude difference between the energy storage device 12 and the diesel generator 11 and the phase difference between the energy storage device 12 and the diesel generator 11 can be calculated by a difference calculation method such as a phase-locked loop calculation method. The controller 13 adjusts the output of the energy storage device 12 by using the voltage amplitude difference value and the phase difference value, so that the voltage amplitude difference value between the energy storage device 12 and the diesel generator 11 is 0 or tends to 0, and the phase difference value between the energy storage device 12 and the diesel generator 11 is 0 or tends to 0, thereby completing the synchronization of the power transmission parameters of the energy storage device 12 and the power transmission parameters of the diesel generator 11.

After the power transmission parameters of the energy storage device 12 are synchronized with the power transmission parameters of the diesel generator 11, the controller 13 may control the first switch K1 and the second switch K2 to be turned on or off by controlling the first coil D1 and the second coil D2 to obtain or lose power, so as to implement seamless and smooth switching between the power supply of the diesel generator 11 and the power supply of the energy storage device 12.

Fig. 3 is a flowchart of a control method of an off-grid hybrid power supply control system according to an embodiment of the present application. The control method of the off-grid hybrid power supply control system can be applied to the off-grid hybrid power supply control system in the embodiment and is executed by the control device. As shown in fig. 3, the control method of the off-grid hybrid power supply control system may include step S201 and step S202.

In step S201, the power of the load is acquired.

The control device executing the control method may specifically be the controller in the above embodiment. The control device may be a device independent of the diesel generator and the energy storage device, or may be installed in the energy storage device, and is not limited herein.

In step S202, the first switch and the second switch are controlled to be closed or opened according to the power of the load and at least one preset load power range, so that the diesel generator and/or the alternating current bus are controlled to be communicated with the alternating current bus.

For specific descriptions of step S201 and step S202, reference may be made to relevant contents in the above embodiments, and details are not repeated here.

In the embodiment of the application, the control device can control the on-off states of the first switch and the second switch according to the acquired power of the load and the preset load power range so as to control the diesel generator and/or the energy storage device to be communicated with the alternating current bus and supply power to the load. Under the condition that the power of the load is different, the energy storage device can be introduced to supply power to the load, frequent output change of the diesel generator in the operation process is avoided, and under the condition that the energy storage device can supply power to the load, the diesel generator can keep stable output, so that the power supply stability of the diesel generator is improved.

And the power supply stability of the diesel generator is improved, the power generation quality of the diesel generator is improved, the aging speed of the diesel generator can be reduced, and the service life of the diesel generator is prolonged. And under the condition that the energy storage equipment can supply power to the load, the oil consumption of the diesel engine can be reduced.

In some examples, the preset load power ranges may include a first preset load power range, a second preset load power range, and a third preset load power range. And the lower limit value of the second preset load power range is larger than the upper limit value of the first preset load power range. The lower limit value of the third preset load power range is larger than the upper limit value of the second preset load power range.

Fig. 4 is a flowchart of a control method of an off-grid hybrid power supply control system according to another embodiment of the present application. Fig. 4 differs from fig. 3 in that step S202 shown in fig. 3 can be refined to step S2021, step S2022, or step S2023.

In step S2021, when the power of the load is within the first preset load power range, the first switch is controlled to be opened, and the second switch is controlled to be closed, so that the energy storage device supplies power to the load through the ac bus.

In step S2022, when the power of the load is in the second preset load power range, the first switch is controlled to be closed, and the second switch is controlled to be closed, so that the diesel generator supplies power to the load through the ac bus and charges the energy storage device through the ac bus.

In step S2023, when the power of the load is in the third preset load power range, the first switch is controlled to be closed, and the second switch is controlled to be opened, so that the diesel generator supplies power to the load through the ac bus.

The specific descriptions of step S021, step S2022 and step S2023 can refer to the related contents in the above embodiments, and are not repeated herein.

Fig. 5 is a flowchart of a control method of an off-grid hybrid power supply control system according to another embodiment of the present application. The control method of the off-grid hybrid power supply control system may include steps S301 to S30

In step S301, the power of the load is acquired.

In step S302, the on-off state of the first switch to be adjusted and the on-off state of the second switch to be adjusted are determined according to the power of the load and at least one preset load power range.

In step S303, if the determined on-off state that the first switch needs to be adjusted and the determined on-off state that the second switch needs to be adjusted indicate that the diesel generator is switched to control the energy storage device to supply power to the load, or indicate that the diesel generator is switched to control the energy storage device to supply power to the load, power transmission parameters are collected from the diesel generator and the energy storage device, respectively, and the power transmission parameters of the energy storage device are synchronized with the power transmission parameters of the diesel generator.

That is, before switching from controlling the diesel generator to supply power to the load to controlling the energy storage device to supply power to the load, or switching from controlling the energy storage device to supply power to the load to controlling the diesel generator to supply power to the load, power transmission parameters are acquired from the diesel generator and the energy storage device respectively, and the power transmission parameters of the energy storage device are synchronized with the power transmission parameters of the diesel generator.

In some examples, the power transmission parameters include voltage magnitude and phase.

In step S304, the first switch is controlled to adjust to the determined on-off state to be adjusted, and the second switch is controlled to adjust to the determined on-off state to be adjusted.

After the power transmission parameters of the energy storage equipment are synchronous with the power transmission parameters of the diesel generator, the controller can control the first switch and the second switch to be switched on or off so as to realize seamless smooth switching between the power supply of the diesel generator and the power supply of the energy storage equipment.

The embodiment of the application also provides a control device of the off-grid hybrid power supply control system. Fig. 6 is a schematic structural diagram of a control device of an off-grid hybrid power supply control system according to an embodiment of the present application. As shown in fig. 6, the control device 400 includes a memory 401, a processor 402, and a program or instructions stored on the memory 401 and executable on the processor 402.

In one example, the processor 402 may include a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or may be configured to implement one or more integrated circuits of embodiments of the present application.

Memory 401 may include mass storage for data or instructions. By way of example, and not limitation, memory 401 may include an HDD, floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or Universal Serial Bus (USB) drive, or a combination of two or more of these. Memory 401 may include removable or non-removable (or fixed) media, where appropriate. The memory 401 may be internal or external to the terminal hotspot activation control device 400, where appropriate. In a particular embodiment, the memory 401 is a non-volatile solid-state memory. In a particular embodiment, the memory 401 includes Read Only Memory (ROM). Where appropriate, the ROM may be mask-programmed ROM, Programmable ROM (PROM), Erasable PROM (EPROM), Electrically Erasable PROM (EEPROM), electrically rewritable ROM (EAROM), or flash memory or a combination of two or more of these.

The processor 402 executes a program or instructions corresponding to the executable program code by reading the executable program code stored in the memory 401, for implementing the control method of the off-grid hybrid power supply control system in the above-described embodiment.

In one example, the control device 400 may also include a communication interface 403 and a bus 404. As shown in fig. 6, the memory 401, the processor 402, and the communication interface 403 are connected by a bus 404 to complete communication therebetween.

The communication interface 403 is mainly used for implementing communication between modules, apparatuses, units and/or devices in the embodiments of the present application. Input devices and/or output devices may also be accessed through communication interface 403.

The bus 404 comprises hardware, software, or both that couple the components of the control device 400 to one another. By way of example, and not limitation, the bus 404 may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hyper Transport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an infiniband interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a video electronics standards association local (VLB) bus, or other suitable bus, or a combination of two or more of these. Bus 404 may include one or more buses, where appropriate. Although specific buses are described and shown in the embodiments of the application, any suitable buses or interconnects are contemplated by the application.

It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For the control method embodiment and the control device embodiment, the relevant points can be referred to the description part of the off-grid hybrid power supply control system embodiment. The present application is not limited to the particular steps and structures described above and shown in the drawings. Those skilled in the art may make various changes, modifications and additions or change the order between the steps after appreciating the spirit of the present application. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.

It will be appreciated by persons skilled in the art that the above embodiments are illustrative and not restrictive. Different features which are present in different embodiments may be combined to advantage. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art upon studying the drawings, the specification, and the claims. In the claims, the term "comprising" does not exclude other means or steps; the word "a" or "an" does not exclude a plurality; the terms "first" and "second" are used to denote a name and not to denote any particular order. Any reference signs in the claims shall not be construed as limiting the scope. The functions of the various parts appearing in the claims may be implemented by a single hardware or software module. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.