阅读说明：本技术 具备互联、供电同步功能的分布式储能电源系统 (Distributed energy storage power supply system with interconnection and power supply synchronization functions ) 是由 张波 陈攀 周万程 冯新 于 2021-08-18 设计创作，主要内容包括：本发明提供了一种具备互联、供电同步功能的分布式储能电源系统,包括：多个储能电源,多个储能电源分布式地设置在不同的位置并从不同的位置接入用电局域网；储能电源包括电池、DC-DC升压器、DC-AC逆变器、与滤波器单元、控制器,电池的输出端依次通过DC-DC升压器、DC-AC逆变器、滤波器单元接入用电局域网,用电局域网的输出电压反馈至控制器,控制器与DC-DC升压器、DC-AC逆变器电连接；多个储能电源的控制器之间相互通信,以使所有储能电源向用电局域网的输出同频、同幅、和同相。本发明使得用户无需将购置的所有储能电源设备都集中放在一起,而是按需放置在同一用电局域网内部的不同空间,即便在主网断电时,所有储能电源设备也能互联,同步为局域电网供电。(The invention provides a distributed energy storage power supply system with interconnection and power supply synchronization functions, which comprises: the energy storage power supplies are arranged at different positions in a distributed manner and are connected to the power utilization local area network from different positions; the energy storage power supply comprises a battery, a DC-DC booster, a DC-AC inverter, a filter unit and a controller, the output end of the battery is connected to the power consumption local area network through the DC-DC booster, the DC-AC inverter and the filter unit in sequence, the output voltage of the power consumption local area network is fed back to the controller, and the controller is electrically connected with the DC-DC booster and the DC-AC inverter; the controllers of the energy storage power supplies are communicated with each other, so that the outputs of all the energy storage power supplies to the power utilization local area network are same in frequency, amplitude and phase. According to the invention, a user does not need to put all purchased energy storage power supply equipment together in a centralized manner, but put the energy storage power supply equipment in different spaces in the same power utilization local area network as required, and all the energy storage power supply equipment can be interconnected to synchronously supply power to the local area network even when the main network is powered off.)

1. A distributed energy storage power supply system with interconnection and power supply synchronization functions is characterized by comprising: the energy storage power supplies are arranged at different positions in a distributed manner and are connected to the power utilization local area network from different positions;

the energy storage power supply comprises a battery, a DC-DC booster used for boosting the battery to meet the requirement of post-stage input, a DC-AC inverter used for converting direct current into alternating current, a filter unit connected with the DC-AC inverter, and an independent controller used for controlling the DC-DC booster and the DC-AC inverter, wherein the output end of the battery is connected to an electric local area network sequentially through the DC-DC booster, the DC-AC inverter and the filter unit, the output voltage of the electric local area network is fed back to the controller, and the controller is electrically connected with the DC-DC booster and the DC-AC inverter;

the controllers of the energy storage power supplies are communicated with each other, so that the outputs of all the energy storage power supplies to the power utilization local area network are same in frequency, amplitude and phase.

2. The distributed energy storage power system with interconnection and power supply synchronization functions as claimed in claim 1, wherein the DC-AC inverter comprises four PWM switching tubes, and the energy storage power supply further comprises a real-time clock connected to the controller, wherein the real-time clock sends a hard interrupt to the controller, and the hard interrupt triggers the controller to control the PWM switching tubes to be turned on or off.

3. The distributed energy storage power system with interconnection and power supply synchronization functions as claimed in claim 2, wherein the energy storage power further comprises a wireless communication module connected to the controller, and the controllers of the plurality of energy storage power systems communicate with each other through the respective wireless communication modules.

4. The distributed energy storage power system with interconnection and power supply synchronization functions as claimed in claim 3, further comprising a relay connected to the main power grid, wherein the relay has a power failure detection function, and the relay is disconnected in case of power failure so as to isolate the power utilization local area network from the main power grid.

5. The distributed energy storage power system with the interconnection and power supply synchronization function according to claim 3, wherein the controllers of the plurality of energy storage power sources communicate with each other, so that the outputs of all the energy storage power sources to the power utilization local area network have the same frequency, the same amplitude and the same phase, and comprise:

when any one of the energy storage power supplies detects that the main power grid is out of power, the controller of the energy storage power supply drives all PWM switching tubes to be disconnected through the control switch, sends broadcast signals to all other energy storage power supplies through the wireless communication module, receives the broadcast signals from all other energy storage power supplies, determines the energy storage power supply as a synchronous host, and determines all other energy storage power supplies as slaves;

the synchronous host reads a current timestamp t _1 from a real-time clock in the synchronous host and broadcasts a preparation signal with the timestamp to the slave through a wireless communication module;

after receiving the preparation signal, each slave machine checks the current time stamp of each internal real-time clock, and returns the current state of each slave machine to the synchronous host machine through each wireless communication module after confirming that the error of the time stamp is within the range of delta t;

after receiving the state information reported back by the slave machines in the power utilization local area network, the synchronous host machine enables a real-time clock arranged in the synchronous host machine to set a synchronous output timestamp t _2 and broadcasts the synchronous output timestamp t _2 to each slave machine through a wireless communication module; each slave machine interacts with the respective real-time clock, a timestamp t _2 is set, and success setting information is reported back to the synchronous host machine through the wireless communication module;

when the real-time clocks in all energy storage power supplies including the synchronous master and the slave in the power utilization local area network run to the set timestamp t _2, the real-time clock of each energy storage power supply generates the hard interrupt;

when the controller of each energy storage power supply receives the hard interrupt signal, the corresponding switch drive is opened, and the output of the DC-AC inverter is started; meanwhile, the controller of each slave machine detects the output in real time, and ensures that the output of the slave machine and the synchronous host machine have the same frequency, the same amplitude and the same phase.

Technical Field

The invention relates to the field of energy storage power supplies, in particular to a distributed energy storage power supply system with interconnection and power supply synchronization functions.

Background

At present, the single power of the consumption-level energy storage power supply is within 2kW, and under the condition of power failure, the single power consumption of a family can not be met far. In order to solve the problem, the existing products improve the overall output power by connecting an ac terminal or a dc terminal (battery) in parallel, and this method needs to put a plurality of energy storage systems together, connect them with each other through a cable (often seen in ac parallel connection) or a parallel connection interface (dc parallel connection) designed by the products, and then output them to the electric equipment.

With the rapid development of energy storage technology, consumer-grade energy storage products will be widely popularized, and one family will purchase one or more energy storage systems near different household appliances to ensure that the household appliances can still work (such as air conditioners, refrigerators and the like) when power is cut off accidentally.

However, the prior art has the following disadvantages: the single energy storage power supply (even if the single energy storage power supply has a grid-connected function) is limited by self power limitation, the power supply of a plurality of large household appliances under the condition of power failure cannot be met, the cascade connection is needed, and a power supply method based on the existing product is adopted, namely, the power supply method is integrated in parallel (all the energy storage power supplies are put together and combined through cables or interfaces), so that a lot of inconvenience is brought to a user.

Disclosure of Invention

The invention provides a distributed energy storage power supply system with interconnection and power supply synchronization functions, and aims to solve at least one technical problem.

To solve the above problems, according to an aspect of the present invention, there is provided a distributed energy storage power supply system having interconnection and power supply synchronization functions, including: the energy storage power supplies are arranged at different positions in a distributed manner and are connected to the power utilization local area network from different positions;

the energy storage power supply comprises a battery, a DC-DC booster used for boosting the battery to meet the requirement of post-stage input, a DC-AC inverter used for converting direct current into alternating current, a filter unit connected with the DC-AC inverter, and an independent controller used for controlling the DC-DC booster and the DC-AC inverter, wherein the output end of the battery is connected to an electric local area network sequentially through the DC-DC booster, the DC-AC inverter and the filter unit, the output voltage of the electric local area network is fed back to the controller, and the controller is electrically connected with the DC-DC booster and the DC-AC inverter;

the controllers of the energy storage power supplies are communicated with each other, so that the outputs of all the energy storage power supplies to the power utilization local area network are same in frequency, amplitude and phase.

Preferably, the DC-AC inverter includes four PWM switching tubes, and the energy storage power supply further includes a real-time clock connected to the controller, where the real-time clock sends a hard interrupt to the controller, and the hard interrupt triggers the controller to control the PWM switching tubes to be turned on or off.

Preferably, the energy storage power supply further comprises a wireless communication module connected with the controller, and the controllers of the plurality of energy storage power supplies are communicated with each other through the respective wireless communication modules.

Preferably, the distributed energy storage power supply system further comprises a relay connected with the main power grid, the relay has a power failure detection function, and the relay is disconnected in the case of power failure so as to isolate the power utilization local area network from the main power grid.

Preferably, the controllers of the energy storage power supplies are in communication with each other, so that the output of all the energy storage power supplies to the power utilization local area network is in the same frequency, the same amplitude and the same phase, and comprises:

when any one of the energy storage power supplies detects that the main power grid is out of power, the controller of the energy storage power supply drives all PWM switching tubes to be disconnected through the control switch, sends broadcast signals to all other energy storage power supplies through the wireless communication module, receives the broadcast signals from all other energy storage power supplies, determines the energy storage power supply as a synchronous host, and determines all other energy storage power supplies as slaves;

the synchronous host reads a current timestamp t _1 from a real-time clock in the synchronous host and broadcasts a preparation signal with the timestamp to the slave through a wireless communication module;

after receiving the preparation signal, each slave machine checks the current time stamp of each internal real-time clock, and returns the current state of each slave machine to the synchronous host machine through each wireless communication module after confirming that the error of the time stamp is within the range of delta t;

after receiving the state information reported back by the slave machines in the power utilization local area network, the synchronous host machine enables a real-time clock arranged in the synchronous host machine to set a synchronous output timestamp t _2 and broadcasts the synchronous output timestamp t _2 to each slave machine through a wireless communication module; each slave machine interacts with the respective real-time clock, a timestamp t _2 is set, and success setting information is reported back to the synchronous host machine through the wireless communication module;

when the real-time clocks in all energy storage power supplies including the synchronous master and the slave in the power utilization local area network run to the set timestamp t _2, the real-time clock of each energy storage power supply generates the hard interrupt;

when the controller of each energy storage power supply receives the hard interrupt signal, the corresponding switch drive is opened, and the output of the DC-AC inverter is started; meanwhile, the controller of each slave machine detects the output in real time, and ensures that the output of the slave machine and the synchronous host machine have the same frequency, the same amplitude and the same phase.

Due to the adoption of the technical scheme, the invention enables a user not to centralize all the purchased energy storage power supply equipment together, but to place the energy storage power supply equipment in different spaces in the same power utilization local area network according to the needs, and all the energy storage power supply equipment can be interconnected to synchronously supply power to the local area network even when the main network is powered off.

Drawings

Fig. 1 schematically illustrates an internal block diagram of a distributed energy storage power supply in one embodiment of the invention;

fig. 2 schematically shows a block diagram of an inverter unit and a control unit with wireless communication and synchronization functions.

Detailed Description

The following detailed description of embodiments of the invention, but the invention can be practiced in many different ways, as defined and covered by the claims.

In order to solve the problems in the prior art, the invention provides a distributed energy storage power supply with interconnection and power supply scheduling functions based on a bidirectional inversion technology and an alternating current synchronization technology, the distributed energy storage power supply comprises a plurality of energy storage power supplies, each energy storage power supply can be randomly distributed at any position in a power utilization range, the energy storage power supplies are interconnected through a wireless communication technology (such as LoraWAN, 3G/4G and the like based on a narrow-band Internet of things technology), a high-precision (microsecond-level) timestamp is synchronously output through an RTC (real time clock), output synchronization is realized by utilizing an internal power supply network in a power utilization area, and power is supplied to the outside in a coordinated and gathered manner under the condition that the physical positions of an energy storage system are dispersed.

As shown in fig. 1, each of the energy storage power supplies in the present invention internally includes a DC-DC booster for boosting a battery to satisfy a post-stage input, a DC-AC inverter for converting a direct current into an alternating current, a filter unit connected to the DC-AC inverter, and a controller for independently controlling the DC-DC booster and the DC-AC inverter. In fig. 1, only two energy storage power sources are shown in parallel to output power, and in fact, multiple energy storage power sources may be included in the application example.

As shown in fig. 2, the energy storage power inverter comprises four PWM switching tubes S11-S14, wherein positive voltage is output when S11 and S14 are turned on, and negative voltage is output when S13 and S12 are turned on. The energy storage power supply inversion part comprises a gate level driver with four PWM switching tubes, a controller (such as a microcontroller or a DSP or a microprocessor) for controlling the gate level driver, a high-precision real-time clock connected with the controller, and a wireless communication module (a ZigBee or LoraWan or 3G/4G/5G network based on a narrow-band communication technology) connected with the controller.

Next, a specific operation principle of the present invention will be explained.

Under the condition of power failure, a relay (with a power failure detection function) connected with the main power grid is disconnected, and the power utilization local area network is isolated from the main power grid.

When one energy storage power supply inverter (1-n) outputs and detects that the main power grid loses power, an internal controller of the energy storage power supply inverter drives and disconnects all switch tubes through a control switch, then the internal controller sends out a broadcast signal through a wireless communication module and receives the broadcast signal from other energy storage power supply inverters (1-n), and a synchronous host (assumed as m) is determined;

the synchronous host m interacts with the high-precision synchronous clock, reads a current timestamp t _1, broadcasts a preparation signal with the timestamp through the wireless communication module, other energy storage power supplies check the current timestamp of the high-precision real-time clock after receiving the preparation signal, confirms that the timestamp error is within a specified range delta t, and returns the current state (such as the state information of battery capacity, battery temperature and the like) to the host through the wireless communication module.

After receiving the state information reported by the slave machines in the power utilization local area network, the synchronous master machine m sets a high-precision real-time clock to set a synchronous output timestamp t _2, broadcasts the synchronous output timestamp t _2 to each slave machine through the wireless communication module, each slave machine interacts with the respective high-precision real-time clock module to set the timestamp t _2, and reports the setting success information to the master machine through the wireless communication module.

When the real-time clocks in all energy storage power inverters in the power utilization local area network run to the set timestamp t _2, hardware interruption is generated, after the controller receives the hardware interruption signal, the switch is turned on to drive, the inverter output is started, meanwhile, the controllers of other slaves except the master m detect the output in real time, and the output of the slaves is guaranteed to be in the same frequency, the same amplitude and the same phase as the master.

The innovation of the invention is that:

(1) by utilizing a narrow-band wireless communication technology and an ad hoc network technology, other energy storage power supplies (which can be distributed at different positions) in the same power utilization network realize synchronous output at an accurate time point, and power is supplied to other power utilization equipment in a local power utilization network under the condition of power failure.

(2) The synchronous output design of the invention does not limit the use mode of users, namely, the users can access the electric equipment to the inversion output of the energy storage power supply or an alternating current socket inside the local area power grid to supply power to the electric equipment.

(3) The invention has the following advantages: the user need not all the energy storage power supply equipment of purchasing all put together in a concentrated way, but places the different spaces in same power consumption LAN as required, even if when the major network outage, all energy storage power supply equipment also can interconnect, supplies power for the LAN in step.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.