阅读说明：本技术 一种能量路由器、直流配电网合环控制系统以及控制方法 (Energy router, direct-current power distribution network closed-loop control system and control method ) 是由 段青 盛万兴 李鹏华 沙广林 赵彩虹 马春燕 于 2020-05-28 设计创作，主要内容包括：本发明涉及一种能量路由器、直流配电网合环控制系统以及控制方法,与直流母线并联的输入侧变流器,用于将换流站接入能量路由器的直流电压转换为第一预期电压等级后作为直流母线的电压；与直流母线并联的输出侧变流器,用于将直流母线的电压转换为第二预期电压等级的交流电和直流电后为接入能量路由器的交流负载和直流负载供电；本发明将不同变流器与直流母线连接,可实现直流配电网的实时互联及合环潮流控制,将不同电压等级和不同特性的高质量电能提供给用户,操作简单,不需要复杂的切换控制。(The invention relates to an energy router, a direct-current distribution network closed-loop control system and a control method.A converter on the input side, which is connected with a direct-current bus in parallel, is used for converting direct-current voltage of a converter station, which is accessed to the energy router, into a first expected voltage class and then is used as the voltage of the direct-current bus; the output side converter is connected with the direct current bus in parallel and used for converting the voltage of the direct current bus into alternating current and direct current of a second expected voltage level and then supplying power to an alternating current load and a direct current load which are connected to the energy router; according to the invention, different converters are connected with the direct current bus, real-time interconnection and closed loop power flow control of the direct current distribution network can be realized, high-quality electric energy with different voltage grades and different characteristics is provided for users, the operation is simple, and complex switching control is not required.)

1. An energy router, comprising: a direct current bus;

the input side converter is connected with the direct current bus in parallel and used for converting direct current voltage of the converter station accessed to the energy router into a first expected voltage level and then taking the first expected voltage level as the voltage of the direct current bus;

and the output side converter is connected with the direct current bus in parallel and used for converting the voltage of the direct current bus into alternating current and direct current with a second expected voltage level and then supplying power to the alternating current load and the direct current load connected into the energy router.

2. The energy router of claim 1 wherein said input side converter in parallel with said dc bus comprises: at least two first dc flow devices;

the output side converter connected in parallel with the direct current bus comprises: at least one second dc converter and at least one ac converter.

3. The energy router of claim 2, wherein the dc bus comprises: a pseudo bipolar dc bus;

the low-voltage ports of the at least two first direct-current converters are connected with the positive electrode and the negative electrode of the pseudo bipolar direct-current bus, and the high-voltage ports of the at least two first direct-current converters are connected with different converter stations;

a high-voltage port of the second direct current converter is connected with the anode and the cathode of the pseudo bipolar direct current bus, and a low-voltage port of the second direct current converter is connected with a direct current load;

and a direct current port of the alternating current converter is connected with the anode and the cathode of the pseudo bipolar direct current bus, and an alternating current port is connected with an alternating current load.

4. The energy router of claim 2, wherein the dc bus comprises: two pseudo-bipolar dc busses;

the at least two first dc current transformers comprise: two low pressure ports;

one low-voltage port of each of the at least two first direct-current converters is connected with the positive electrode and the negative electrode of one of the two pseudo-bipolar direct-current buses, the other low-voltage port of each of the at least two first direct-current converters is connected with the positive electrode and the negative electrode of the other pseudo-bipolar direct-current bus of the two pseudo-bipolar direct-current buses, and high-voltage ports of the at least two first direct-current converters are connected with different converter stations;

a high-voltage port of the second direct current converter is connected with the positive electrode and the negative electrode of one of the two pseudo-bipolar direct current buses, and a low-voltage port of the second direct current converter is connected with a direct current load;

and a direct current port of the alternating current converter is connected with the anode and the cathode of one of the two pseudo-bipolar direct current buses, and an alternating current port is connected with an alternating current load.

5. The energy router of claim 2, wherein the dc bus comprises: a true bipolar direct current bus;

the low-voltage port of at least one of the at least two first direct-current converters is connected with the positive electrode and the zero line of the true bipolar direct-current bus, the low-voltage port of at least one of the at least two first direct-current converters is connected with the negative electrode and the zero line of the true bipolar direct-current bus, and the high-voltage ports of the at least two first direct-current converters are connected with different converter stations;

the high-voltage port of the second direct current converter is connected with the negative electrode and the zero line of the pseudo bipolar direct current bus, and the low-voltage port of the second direct current converter is connected with a direct current load;

and a direct current port of the alternating current converter is connected with the positive pole and the zero line of the pseudo bipolar direct current bus, and an alternating current port is connected with an alternating current load.

6. The energy router of claim 3, wherein the first desired voltage level comprises: 750 kVDC;

the second desired voltage level of direct current comprises: 375 kVDC;

the alternating current of the second desired voltage level comprises: 380 kVAC.

7. The energy router of claim 4, wherein the first expected voltage level comprises: 750kVDC and 375 kVDC;

the direct current at the second desired voltage level is 110 vdc;

the alternating current at the second desired voltage level is 380 kVAC.

8. The energy router of claim 5, wherein the first desired voltage level comprises: 750 kVDC;

the direct current at the second desired voltage level is 110 vdc;

the alternating current at the second desired voltage level is 380 kVAC.

9. The utility model provides a direct current distribution network closes ring control system which characterized in that includes:

an energy router according to any one of claims 1 to 8;

the converter station is connected with the input side converter in the energy router;

and the direct current load and the alternating current load are connected with the output side converter in the energy router.

10. A method of controlling the system of claim 9, comprising:

converting the direct-current voltage of the converter station accessed to the energy router into a first expected voltage level and then using the first expected voltage level as the voltage of a direct-current bus;

and converting the voltage of the direct current bus into alternating current and direct current with a second expected voltage level, and then supplying power to the direct current load and the alternating current load connected to the energy router.

Technical Field

The invention relates to the technical field of energy Internet, in particular to an energy router, a direct-current power distribution network closed loop control system and a control method.

Background

The ubiquitous power Internet of things construction is an important content and key link of energy Internet construction. At present, carry out the interconnection at direct current distribution network to when providing the alternating current-direct current power supply to the landing point, adopt complicated circuit breaker and change over switch to connect earlier, then the reuse DC transformer supplies power, and it has multiple shortcoming: the open loop operation cannot realize real-time closed loop power flow control; when the power flow is controlled by switching on and off the change-over switch, the cooperation of multiple parts is needed; the control and operation scheme is relatively complex, and a plurality of operation modes must be formulated; when the problems of flexible real-time interconnection of a direct-current distribution line, alternating-current and direct-current hybrid power supply and access of a distributed power supply are solved, the defects that real-time loop closing power flow control cannot be realized and operation is complex are more prominent.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to solve the problems of flexible real-time interconnection and loop closing power flow control of a direct current distribution line of an alternating current and direct current hybrid power distribution network, access of alternating current and direct current hybrid power supply and a distributed power supply and the like in the construction of an energy internet by arranging different converters to be connected with a direct current bus.

The purpose of the invention is realized by adopting the following technical scheme:

the invention provides an energy router, the improvement of which is that the energy router comprises:

a direct current bus;

the input side converter is connected with the direct current bus in parallel and used for converting direct current voltage of the converter station accessed to the energy router into a first expected voltage level and then taking the first expected voltage level as the voltage of the direct current bus;

and the output side converter is connected with the direct current bus in parallel and used for converting the voltage of the direct current bus into alternating current and direct current with a second expected voltage level and then supplying power to the alternating current load and the direct current load connected into the energy router.

Preferably, the input-side converter connected in parallel with the dc bus includes: at least two first dc flow devices;

the output side converter connected in parallel with the direct current bus comprises: at least one second dc converter and at least one ac converter.

Further, the dc bus includes: a pseudo bipolar dc bus;

the low-voltage ports of the at least two first direct-current converters are connected with the positive electrode and the negative electrode of the pseudo bipolar direct-current bus, and the high-voltage ports of the at least two first direct-current converters are connected with different converter stations;

a high-voltage port of the second direct current converter is connected with the anode and the cathode of the pseudo bipolar direct current bus, and a low-voltage port of the second direct current converter is connected with a direct current load;

and a direct current port of the alternating current converter is connected with the anode and the cathode of the pseudo bipolar direct current bus, and an alternating current port is connected with an alternating current load.

Further, the dc bus includes: two pseudo-bipolar dc busses;

the at least two first dc current transformers comprise: two low pressure ports;

one low-voltage port of each of the at least two first direct-current converters is connected with the positive electrode and the negative electrode of one of the two pseudo-bipolar direct-current buses, the other low-voltage port of each of the at least two first direct-current converters is connected with the positive electrode and the negative electrode of the other pseudo-bipolar direct-current bus of the two pseudo-bipolar direct-current buses, and high-voltage ports of the at least two first direct-current converters are connected with different converter stations;

a high-voltage port of the second direct current converter is connected with the positive electrode and the negative electrode of one of the two pseudo-bipolar direct current buses, and a low-voltage port of the second direct current converter is connected with a direct current load;

and a direct current port of the alternating current converter is connected with the anode and the cathode of one of the two pseudo-bipolar direct current buses, and an alternating current port is connected with an alternating current load.

Further, the dc bus includes: a true bipolar direct current bus;

the low-voltage port of at least one of the at least two first direct-current converters is connected with the positive electrode and the zero line of the true bipolar direct-current bus, the low-voltage port of at least one of the at least two first direct-current converters is connected with the negative electrode and the zero line of the true bipolar direct-current bus, and the high-voltage ports of the at least two first direct-current converters are connected with different converter stations;

the high-voltage port of the second direct current converter is connected with the negative electrode and the zero line of the pseudo bipolar direct current bus, and the low-voltage port of the second direct current converter is connected with a direct current load;

and a direct current port of the alternating current converter is connected with the positive pole and the zero line of the pseudo bipolar direct current bus, and an alternating current port is connected with an alternating current load.

Further, the first desired voltage level includes: 750 kVDC;

the second desired voltage level of direct current comprises: 375 kVDC;

the alternating current of the second desired voltage level comprises: 380 kVAC.

Further, the first desired voltage level includes: 750kVDC and 375 kVDC;

the direct current at the second desired voltage level is 110 vdc;

the alternating current at the second desired voltage level is 380 kVAC.

Further, the first desired voltage level includes: 750 kVDC;

the direct current at the second desired voltage level is 110 vdc;

the alternating current at the second desired voltage level is 380 kVAC.

Based on the same invention concept, the invention also provides a direct current distribution network closed loop control system, and the improvement is that the system comprises:

an energy router as described previously;

the converter station is connected with the input side converter in the energy router;

and the direct current load and the alternating current load are connected with the output side converter in the energy router.

Based on the same invention concept, the invention also provides a control method of the direct current distribution network closed loop control system, and the improvement is that the control method comprises the following steps:

converting the direct-current voltage of the converter station accessed to the energy router into a first expected voltage level and then using the first expected voltage level as the voltage of a direct-current bus;

and converting the voltage of the direct current bus into alternating current and direct current with a second expected voltage level, and then supplying power to the direct current load and the alternating current load connected to the energy router.

Compared with the closest prior art, the invention has the following beneficial effects:

the invention relates to an energy router, a direct current distribution network closed loop control system and a control method, wherein a direct current bus is used for carrying out closed loop control on a direct current distribution network; the input side converter is connected with the direct current bus in parallel and used for converting direct current voltage of the converter station accessed to the energy router into a first expected voltage level and then taking the first expected voltage level as the voltage of the direct current bus; the output side converter is connected with the direct current bus in parallel and used for converting the voltage of the direct current bus into alternating current and direct current of a second expected voltage level and then supplying power to an alternating current load and a direct current load which are connected to the energy router; according to the invention, different converters are connected with the direct current bus, so that real-time interconnection and closed loop power flow control of the direct current power distribution network can be realized, high-quality electric energy with different voltage grades and different characteristics is provided for users, the operation is simple, and complex switching control is not needed;

the alternating current converter and the direct current converter in the scheme are connected with an alternating current load and a direct current load, so that the construction of a microgrid is realized;

the input side converter connected with the direct current bus in parallel comprises at least two first direct current converters, and a plurality of first direct current converters can be added according to actual needs to perform loop closing control.

Drawings

FIG. 1 is a schematic diagram of an energy router of the present invention;

fig. 2 is a first structural diagram of an energy router according to an embodiment of the present invention;

fig. 3 is a second structural diagram of an energy router according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a third structure of the energy router according to the embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a closed loop control system of a DC distribution network according to the present invention;

fig. 6 is a flow chart of a control method of the closed loop control system of the direct current distribution network.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides an energy router, as shown in fig. 1, the system:

a direct current bus;

the input side converter is connected with the direct current bus in parallel and used for converting direct current voltage of the converter station accessed to the energy router into a first expected voltage level and then taking the first expected voltage level as the voltage of the direct current bus;

and the output side converter is connected with the direct current bus in parallel and used for converting the voltage of the direct current bus into alternating current and direct current with a second expected voltage level and then supplying power to the alternating current load and the direct current load connected into the energy router.

In order to more clearly illustrate the objects of the present invention, the following embodiments are further described.

In an embodiment of the present invention, the input-side converter connected in parallel to the dc bus includes: at least two first dc flow devices;

the output side converter connected in parallel with the direct current bus comprises: at least one second dc converter and at least one ac converter.

Further, as shown in fig. 2, the dc bus includes: a pseudo bipolar dc bus;

the low-voltage ports of the at least two first direct-current converters (the converter 1 and the converter 2) are connected with the positive electrode and the negative electrode of the pseudo bipolar direct-current bus, and the high-voltage ports are connected with different converter stations (the converter station 1 and the converter station 2);

a high-voltage port of the second direct current converter (converter 3) is connected with the anode and the cathode of the pseudo bipolar direct current bus, and a low-voltage port is connected with a direct current load;

and a direct current port of the alternating current converter (converter 4) is connected with the anode and the cathode of the pseudo bipolar direct current bus, and an alternating current port is connected with an alternating current load.

In fig. 2, the first desired voltage level includes: 750 kVDC; the corresponding power is 1MW or 3 MW; the second desired voltage level of direct current comprises: 375 kVDC; the corresponding power is 1 MW; the alternating current of the second desired voltage level comprises: 380 kVAC; the corresponding power is 1 MW. The low-voltage port of the input side converter 5 is connected with the positive and negative electrodes of the pseudo-bipolar direct-current bus, the high-voltage port is connected with the converter station 3, and the voltage grade can be designed according to actual needs in a matching mode.

Further, as shown in fig. 3, the dc bus includes: two pseudo-bipolar dc busses;

the at least two first dc current transformers comprise: two low pressure ports;

one low-voltage port of each of the at least two first direct-current converters (converters 1 and 2) is connected with the positive electrode and the negative electrode of one of the two pseudo-bipolar direct-current buses, the other low-voltage port is connected with the positive electrode and the negative electrode of the other pseudo-bipolar direct-current bus of the two pseudo-bipolar direct-current buses, and high-voltage ports of the at least two first direct-current converters are connected with different converter stations;

a high-voltage port of the second direct current converter (converter 3) is connected with the positive electrode and the negative electrode of one pseudo bipolar direct current bus in the two pseudo bipolar direct current buses, and a low-voltage port is connected with a direct current load;

and a direct current port of the alternating current converter (converter 4) is connected with the positive electrode and the negative electrode of one of the two pseudo-bipolar direct current buses, and an alternating current port is connected with an alternating current load.

Wherein the first expected voltage level comprises: 750kVDC and 375 kVDC; the corresponding power is 1.5 MW; the direct current at the second desired voltage level is 110 vdc; the corresponding power is 500 kW; the alternating current of the second expected voltage level is 380 kVAC; the corresponding power is 1 MW. The low-voltage port of the input side converter 5 is connected with the positive and negative electrodes of a pseudo bipolar direct current bus, the high-voltage port is connected with the converter station 3, and the voltage grade can be matched and designed according to actual requirements

Further, as shown in fig. 4, the dc bus includes: a true bipolar direct current bus;

the low-voltage port of at least one first direct-current converter (converter 2) in the at least two first direct-current converters is connected with the positive pole and the zero line of the true bipolar direct-current bus, the low-voltage port of at least one first direct-current converter (converter 1) in the at least two first direct-current converters is connected with the negative pole and the zero line of the true bipolar direct-current bus, and the high-voltage ports of the at least two first direct-current converters are connected with different converter stations;

a high-voltage port of the second direct current converter (converter 3) is connected with the negative electrode and the zero line of the pseudo bipolar direct current bus, and a low-voltage port is connected with a direct current load;

and a direct current port of the alternating current converter (converter 4) is connected with the positive electrode and the zero line of the pseudo bipolar direct current bus, and an alternating current port is connected with an alternating current load.

Wherein the first expected voltage level comprises: 750 kVDC; the corresponding power is 1.5-3 MW; the direct current at the second desired voltage level is 110 vdc; the corresponding power is 500 kW; the alternating current of the second expected voltage level is 380 kVAC; the corresponding power is 1 MW. The low-voltage port of the input side converter 5 is connected with the positive and negative electrodes of the true bipolar direct current bus, the high-voltage port is connected with the converter station 3, and the voltage grade can be designed according to actual needs in a matching mode.

The voltage level of the converter station 1 is 10kVDC, and the power level is 2 MW; the voltage level of the converter station 2 is 10 vdc and the power level is 1 MW.

Based on the same inventive concept, the present invention further provides a dc distribution network closed loop control system, as shown in fig. 5, including:

an energy router as described previously;

the converter station is connected with the input side converter in the energy router;

and the direct current load and the alternating current load are connected with the output side converter in the energy router.

Based on the same inventive concept, the present invention further provides a control method of a dc distribution network closed-loop control system, as shown in fig. 6, including:

converting the direct-current voltage of the converter station accessed to the energy router into a first expected voltage level and then using the first expected voltage level as the voltage of a direct-current bus;

and converting the voltage of the direct current bus into alternating current and direct current with a second expected voltage level, and then supplying power to the direct current load and the alternating current load connected to the energy router.

In summary, the present invention relates to an energy router, a dc distribution network closed loop control system and a control method, a dc bus; the input side converter is connected with the direct current bus in parallel and used for converting direct current voltage of the converter station accessed to the energy router into a first expected voltage level and then taking the first expected voltage level as the voltage of the direct current bus; the output side converter is connected with the direct current bus in parallel and used for converting the voltage of the direct current bus into alternating current and direct current of a second expected voltage level and then supplying power to an alternating current load and a direct current load which are connected to the energy router; according to the invention, different converters are connected with the direct current bus, so that real-time interconnection and closed loop power flow control of the direct current power distribution network can be realized, high-quality electric energy with different voltage grades and different characteristics is provided for users, the operation is simple, and complex switching control is not needed;

the alternating current converter and the direct current converter in the scheme are connected with an alternating current load and a direct current load, so that the construction of a microgrid is realized;

the input side converter connected with the direct current bus in parallel comprises at least two first direct current converters, and a plurality of first direct current converters can be added according to actual needs to perform loop closing control.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.