CN112636353A

CN112636353A - Power distribution system and control method thereof

Info

Publication number: CN112636353A
Application number: CN202011388075.3A
Authority: CN
Inventors: 陈盛燃; 钟荣富; 夏云峰; 黄匀飞; 薛峰; 何文志; 赵树宏
Original assignee: Guangdong Power Grid Co Ltd; Dongguan Power Supply Bureau of Guangdong Power Grid Co Ltd
Current assignee: Guangdong Power Grid Co Ltd; Dongguan Power Supply Bureau of Guangdong Power Grid Co Ltd
Priority date: 2020-12-01
Filing date: 2020-12-01
Publication date: 2021-04-09

Abstract

The invention discloses a power distribution system and a control method thereof. The power distribution system includes: a power electronic transformer comprising a first port, a second port and a third port; the output port of the alternating current power supply subsystem is electrically connected with the first port of the power electronic transformer; the input port of the alternating current power distribution subsystem is electrically connected with the second port of the power electronic transformer; the first port of the direct current distribution subsystem is electrically connected with the third port of the power electronic transformer; the direct current power distribution subsystem comprises an energy storage module, and the energy storage module is used for providing energy for the direct current power distribution subsystem when the alternating current power supply subsystem fails and providing energy for the alternating current power distribution subsystem through the power electronic transformer. The invention can improve the power supply reliability of the power distribution system.

Description

Power distribution system and control method thereof

Technical Field

The embodiment of the invention relates to the technical field of power grid operation, in particular to a power distribution system and a control method thereof.

Background

With the rapid development of power distribution technologies and power electronic device control technologies, grid structures of power distribution networks have more possibilities, and develop towards more intelligent, more efficient and more direct modes. At present, the Power Electronic Transformer (PET) technology is mature, and the number of demonstration projects for applying Power Electronic Transformer equipment is increasing.

The power electronic transformer has the characteristics of flexible control, high energy conversion efficiency, multiple ports and the like, and is very suitable for being applied to a power supply and distribution system with alternating current and direct current hybrid loads. However, the current ac/dc hybrid power distribution system based on the power electronic technology also has the problems that the load power supply loop corresponding to the ac feeder is single, and the power flow transfer capability of the ac/dc hybrid power distribution system is low, so that when multiple faults occur in the power transmission lines in the ac system and the dc system, normal power supply to the non-fault power transmission lines cannot be ensured. Therefore, the conventional power distribution system has a problem of poor power supply reliability.

Disclosure of Invention

The embodiment of the invention provides a power distribution system and a control method thereof, which are used for improving the power supply reliability of the power distribution system.

In a first aspect, an embodiment of the present invention provides a power distribution system, where the power distribution system includes:

a power electronic transformer comprising a first port, a second port and a third port;

the output port of the alternating current power supply subsystem is electrically connected with the first port of the power electronic transformer;

the input port of the alternating current power distribution subsystem is electrically connected with the second port of the power electronic transformer;

the first port of the direct current distribution subsystem is electrically connected with the third port of the power electronic transformer; the direct current power distribution subsystem comprises an energy storage module, and the energy storage module is used for providing energy for the direct current power distribution subsystem when the alternating current power supply subsystem fails and providing energy for the alternating current power distribution subsystem through the power electronic transformer.

Optionally, the ac power supply subsystem includes: a first bus and a first circuit breaker;

the first bus is electrically connected with a first port of the power electronic transformer; the first circuit breaker is connected in series with the first bus, and the first circuit breaker is used for controlling whether the first bus supplies power to the power electronic transformer.

Optionally, the ac power distribution subsystem comprises: a second bus, a second circuit breaker, and a first load;

the second bus is electrically connected with a second port of the power electronic transformer; the second circuit breaker is connected in series with the second bus and is used for controlling whether the second bus is electrified or not; the first load is electrically connected to the second bus bar; the second bus bar provides energy to the first load.

Optionally, the first load comprises: at least one of air conditioning, lighting, electrical outlets, and power equipment.

Optionally, the dc power distribution subsystem further includes: a third bus, a third circuit breaker, and a second load;

the third bus is electrically connected with a third port of the power electronic transformer; the energy storage module is electrically connected with the third bus; the third circuit breaker is connected in series with the third bus and is used for controlling the on-off between the power electronic transformer and the third bus; the second load is electrically connected to the third bus bar; the third bus bar provides energy to the second load.

Optionally, the energy storage module comprises: the energy storage unit, the new energy power generation unit, the fourth circuit breaker and the fifth circuit breaker;

the energy storage unit is electrically connected with the third bus through the fourth circuit breaker; and the new energy power generation unit is electrically connected with the third bus through the fifth circuit breaker.

Optionally, the second load comprises: at least one of a server, an automobile charging pile, a direct current air conditioner, direct current lighting and a direct current socket.

In a second aspect, an embodiment of the present invention provides a method for controlling a power distribution system, where the method for controlling a power distribution system includes the following steps:

judging whether the AC power supply subsystem fails;

if so, controlling the energy storage module to provide energy for the direct current power distribution subsystem; and controlling the energy storage module to provide energy to the alternating current power distribution subsystem through the power electronic transformer;

otherwise, providing energy to the direct current distribution subsystem and the alternating current distribution subsystem by the alternating current power supply subsystem through the power electronic transformer.

Optionally, the control method of the power distribution system further includes:

judging whether the alternating current power distribution subsystem has a fault;

if so, controlling the AC power distribution subsystem to be powered off; the ac power supply subsystem provides energy to the dc power distribution subsystem through the power electronic transformer.

judging whether the direct current power distribution subsystem has a fault;

if yes, controlling the connection between the power electronic transformer and the direct current distribution subsystem to be disconnected; the energy storage module provides energy to the DC power distribution subsystem.

In the power distribution system provided by the embodiment of the invention, the power electronic transformer is arranged to be connected with the alternating current power supply subsystem, the direct current power distribution subsystem and the alternating current power distribution subsystem to form an alternating current-direct current hybrid power distribution system. Any two ports among the first port, the second port and the third port of the power electronic transformer can perform bidirectional flow of energy, and the power flow transfer capacity of the alternating current-direct current hybrid power distribution system is improved. And the energy storage module is arranged in the direct current distribution subsystem, and due to the existence of the energy storage module and the characteristic that energy can flow bidirectionally among the ports of the power electronic transformer, even if the alternating current power supply subsystem breaks down, the energy storage module can be adopted to provide energy for the direct current distribution subsystem and the alternating current distribution subsystem, so that the flexibility of power supply of the whole power distribution system is increased, and the reliable power supply of a non-fault line when the power distribution system breaks down is ensured. Therefore, compared with the prior art, the embodiment of the invention can improve the reliability of the power distribution system.

Drawings

Fig. 1 is a schematic structural diagram of a power distribution system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an alternative power distribution system provided by embodiments of the present invention;

fig. 3 is a schematic flow chart of a control method of a power distribution system according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of an operating mode of a power distribution system provided by an embodiment of the present invention;

fig. 5 is a schematic flowchart of full-operation startup of a power distribution system according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

The embodiment of the invention provides a power distribution system. Fig. 1 is a schematic structural diagram of a power distribution system according to an embodiment of the present invention. As shown in fig. 1, the power distribution system includes: a Power Electronic Transformer (PET)110, an ac power subsystem 120, an ac power distribution subsystem 130, and a dc power distribution subsystem 140.

The power electronic transformer 110 includes a first port 111, a second port 112, and a third port 113. The output port of the ac power supply subsystem 120 is electrically connected to the first port 111 of the power electronic transformer 110; the input port of the ac distribution subsystem 130 is electrically connected to the second port 112 of the power electronic transformer 110; a first port of the dc power distribution subsystem 140 is electrically connected to the third port 113 of the power electronic transformer 110. The dc power distribution subsystem 140 includes an energy storage module 141, and the energy storage module 141 is configured to provide energy to the dc power distribution subsystem 140 and to provide energy to the ac power distribution subsystem 130 through the power electronic transformer 110 when the ac power supply subsystem 120 fails.

In the embodiment of the present invention, the power electronic transformer 110 is used as an interface for energy conversion, and is respectively connected to the ac power supply subsystem 120, the ac power distribution subsystem 130, and the dc power distribution subsystem 140 to form an ac/dc hybrid power distribution system. Alternatively, the power distribution system can be applied to power supply of an office life park with alternating current and direct current hybrid loads. The system can provide cleaner and more diversified electricity utilization services for users in the office life park.

Compared with the traditional transformer, the power electronic transformer 110 adopts power electronic devices (such as IGBT) to carry out voltage conversion, has small volume and high enough power density, avoids the use of insulating oil, and is cleaner and more environment-friendly. Besides the functions of electric energy conversion and transmission of the traditional power transformer, the power electronic transformer 110 can realize the real-time control of the amplitude and phase of the alternating-current side voltage of the transformer by the primary and secondary voltage source converters, can realize the flexible regulation of the primary and secondary voltage, current and power of the transformer, has good control performance in the transient process, has the function of a circuit breaker, and does not need a traditional relay protection device of the transformer and the like. Thus, the ports of power electronic transformer 110 can perform open and close operations, and power electronic transformer 110 has the potential to isolate power system line faults. In addition, any two ports of the power electronic transformer 110 have a function of bidirectional energy flow, so that the power flow adjustment of the whole system is more flexible.

Illustratively, taking an office living park as an example, the ac power subsystem 120 may be a 10kV ac power subsystem; in order to meet the requirements of various domestic and office electricity, the alternating current power distribution subsystem 130 can be a 380V alternating current power utilization subsystem; the dc power distribution subsystem 140 may be a 240V dc power subsystem.

Alternatively, in the dc power distribution subsystem 140, the energy storage module 141 may store energy in various forms such as mechanical energy, thermal energy, electromagnetic energy, etc., and when the energy storage module 141 is required to supply power, the energy storage module 141 converts the energy into electric energy to be transmitted to the outside. The energy storage module may be a battery pack or an energy storage machine, for example.

During normal operation of the power distribution system, the ac power distribution subsystem 130 and the dc power distribution subsystem 140 are powered by the ac power supply subsystem 120. Specifically, the energy of the ac power supply subsystem 120 is transmitted to the ac power distribution subsystem 130 through the first port 111 and the second port 112 of the power electronic transformer 110 via overvoltage conversion; and the energy of the ac power supply subsystem 120 is rectified and converted into dc power through the first port 111 and the third port 113 of the power electronic transformer 110, and is transmitted to the dc power distribution subsystem 140. When the load in the dc power distribution subsystem 140 suddenly increases and the energy of the ac power supply subsystem 110 is not available or sufficient, the energy storage module 141 may be started to meet the power demand of the dc power distribution subsystem 140.

When the ac power subsystem 120 fails or the first port 111 of the power electronic transformer 110 fails for external or internal reasons, the first port 111 of the power electronic transformer 110 may be controlled to be locked, so as to disconnect the ac power subsystem 120 from the power electronic transformer 110, i.e. to disconnect the main energy source of the system. At this point, the energy storage module 141 in the dc power distribution subsystem 140 may be activated to provide energy to the dc power distribution subsystem 140 and the ac power distribution subsystem 130 through the energy storage module 141. Specifically, the energy storage module 141 provides energy directly to the dc power distribution subsystem 140; and the energy of the energy storage module 141 is converted into alternating current through the third port 113 and the second port 112 of the power electronic transformer 110 by inversion, and the alternating current is provided to the alternating current distribution subsystem 130.

In the power distribution system provided by the embodiment of the invention, the power electronic transformer 110 is arranged to be connected with the alternating current power supply subsystem 120, the direct current power distribution subsystem 130 and the alternating current power distribution subsystem 140 to form an alternating current and direct current hybrid power distribution system. Any two ports among the first port 111, the second port 112 and the third port 113 of the power electronic transformer 110 can perform bidirectional flow of energy, so that the power flow transfer capability of the alternating current/direct current hybrid power distribution system is increased. And the energy storage module 141 is arranged in the direct current distribution subsystem 140, and due to the existence of the energy storage module 141 and the characteristic that energy can flow bidirectionally between the ports of the power electronic transformer 110, even if the alternating current power supply subsystem 120 fails, the energy storage module 141 can be adopted to provide energy for the direct current distribution subsystem 140 and the alternating current distribution subsystem 130, so that the flexibility of power supply of the whole power distribution system is increased, and the reliable power supply of a non-fault line when the power distribution system fails is ensured. Therefore, the embodiment of the invention can improve the reliability of the power distribution system.

Fig. 2 is a schematic structural diagram of another power distribution system provided in the embodiment of the present invention. Referring to fig. 2, on the basis of the above embodiments, this embodiment provides a possible implementation manner for the specific configuration of each sub-module, and optionally, the ac power supply subsystem 120 includes: a first bus bar W1 and a first circuit breaker CB 1. The first busbar W1 is electrically connected to the first port 111 of the power electronic transformer 110; the first circuit breaker CB1 is connected in series to the first bus W1, and the first circuit breaker CB1 is used to control whether the first bus W1 supplies power to the power electronic transformer 110.

Optionally, the first circuit breaker CB1 is correspondingly arranged according to the voltage level of the first bus bar W1. Illustratively, taking an office living park as an example, the first bus W1 may be a 10kV AC bus, and the first circuit breaker CB1 may be a mechanical circuit breaker, a solid-state circuit breaker, or a hybrid circuit breaker, which may be selected according to actual needs, and is not limited herein. When the first bus W1 is required to supply power to the power electronic transformer 110, the first circuit breaker CB1 is closed first, and then the first port 111 of the power electronic transformer 110 is started. When the first bus bar W1 fails or needs to be overhauled, the first circuit breaker CB1 can be controlled to open and cut off the connection between the first bus bar W1 and the power electronic transformer 110.

With continued reference to fig. 2, based on the above embodiments, the ac power distribution subsystem 130 optionally includes: a second bus W2, a second breaker CB2 and a first load 131. Wherein, the second bus bar W2 is electrically connected with the second port 112 of the power electronic transformer 110; the second circuit breaker CB2 is connected in series to the second bus W2, and the second circuit breaker CB2 is used for controlling whether the second bus W2 is electrified or not; the first load 131 is electrically connected to the second bus bar W2; the second busbar W2 provides energy to the first load 131.

Optionally, the second circuit breaker CB2 is correspondingly arranged according to the voltage level of the second bus bar W2. For example, taking an office living park as an example, the second bus W2 may be a 380V AC bus, and the second circuit breaker CB2 may be a mechanical circuit breaker, a solid-state circuit breaker, or a hybrid circuit breaker, which may be selected according to actual needs, and is not limited herein. When the power electronic transformer 110 is required to transmit electric energy to the second bus W2, the second circuit breaker CB2 is closed first, and then the second port 112 of the power electronic transformer 110 is started. When the second bus W2 fails or needs to be overhauled, the second circuit breaker CB2 can be controlled to open and cut off the connection between the second bus W2 and the power electronic transformer 110. The first load 131 is an ac load, and the energy source thereof is the second bus W2.

With continued reference to fig. 2, based on the above embodiments, the first load 131 optionally includes: at least one of an air conditioner 11, a lighting 12, a socket 13, and a power device 14. The various loads in the first load 131 may be connected in series or in parallel. Each load device of the first load 131 illustratively includes a voltage conversion device therein, which converts the voltage on the second bus W2 into a voltage required for its own operation.

With continued reference to fig. 2, based on the foregoing embodiments, optionally, the dc power distribution subsystem 140 further includes: a third bus W3, a third breaker CB3 and a second load 142. Wherein, the third bus bar W3 is electrically connected with the third port 113 of the power electronic transformer 110; the energy storage module 141 is electrically connected to the third bus bar W3; the third circuit breaker CB3 is connected in series with the third bus W3, and the third circuit breaker CB3 is used for controlling the connection and disconnection between the power electronic transformer 110 and the third bus W3; the second load 142 is electrically connected to the third bus bar W3; the third busbar W3 provides energy to the second load 142.

Optionally, the third circuit breaker CB3 is correspondingly arranged according to the voltage level of the third bus W3. For example, taking an office living park as an example, the third bus W3 may be a 240V DC bus, and the third circuit breaker CB3 may be a DC circuit breaker, which may be a mechanical circuit breaker, a solid-state circuit breaker, or a hybrid circuit breaker, and may be selected according to actual needs, which is not limited herein. When the power electronic transformer 110 is required to transmit electric energy to the third bus W3, the third circuit breaker CB3 is closed first, and then the third port 113 of the power electronic transformer 110 is started. When the third bus bar W3 fails or needs to be overhauled, the third circuit breaker CB3 can be controlled to open and cut off the connection between the third bus bar W3 and the power electronic transformer 110. The second load 142 is a dc load, and its energy source is the third bus W3.

With continued reference to fig. 2, based on the above embodiments, the second load 142 optionally includes: at least one of a server 31, an automobile charging post 32, a dc air conditioner 33, a dc lighting 34, and a dc outlet 35. Each load device of the second load 142 illustratively includes a voltage conversion device to convert the voltage on the third bus W3 into a voltage required for its operation.

With continued reference to fig. 2, based on the above embodiments, the energy storage module 141 optionally includes: the energy storage unit 21, the new energy power generation unit 22, a fourth circuit breaker CB4 and a fifth circuit breaker CB 5. The energy storage unit 21 is electrically connected with a third bus W3 through a fourth circuit breaker CB 4; the new energy power generation unit 22 is electrically connected to the third bus bar W3 through a fifth circuit breaker CB 5.

Alternatively, the energy storage unit 21 may be a battery pack or an energy storage machine, etc.; the new energy power generation unit 22 may use photovoltaic power generation or wind power generation. The fourth circuit breaker CB4 and the fifth circuit breaker CB5 are both direct current circuit breakers.

In the embodiment of the invention, by arranging the new energy power generation unit 22, clean energy is developed and utilized, the requirements of green economy, energy conservation and emission reduction are responded, and the pressure of a power grid can be relieved; and the energy storage unit 21 is arranged to store the electric energy provided by the new energy power generation unit 22, so that the utilization rate of the electric energy generated by the new energy power generation unit 22 is improved. Therefore, the energy storage module 141 is required to supply power, and the problem that the electric energy generated by the new energy power generation unit 22 is insufficient while the new energy power generation is used immediately can be solved. And, set up fourth circuit breaker CB4 and fifth circuit breaker CB5, can effectively control the opportunity that energy storage module 141 inserts third generating line W3, make the distribution system more safe and reliable.

The embodiment of the invention also provides a control method of the power distribution system, which can be executed by the control device and is used for controlling the operation of the power distribution system provided by any embodiment, and the control method has corresponding beneficial effects.

Fig. 3 is a flowchart illustrating a control method of a power distribution system according to an embodiment of the present invention. Referring to fig. 3, the control method of the power distribution system includes:

and S110, starting the power electronic transformer.

Wherein starting the power electronic transformer may comprise starting each port of the power electronic transformer in turn.

And S120, judging whether the AC power supply subsystem has a fault, if so, executing S130, and otherwise, executing S140.

Wherein, the ac power supply subsystem fault may include: faults such as grounding, bird strike and the like occur on a bus in the alternating current power supply subsystem, equipment in the alternating current power supply subsystem fails and the like occur; it may also be included that the first port of the power electronic transformer fails for internal or external reasons.

S130, controlling the energy storage module to provide energy for the direct current power distribution subsystem; and controlling the energy storage module to provide energy to the alternating current power distribution subsystem through the power electronic transformer.

When the alternating current power supply subsystem breaks down, the first port of the power electronic transformer is controlled to be locked. The energy storage module provides energy required by the whole system. At this point, the power distribution system may be said to operate in an off-grid mode. In this mode, the energy storage module directly provides energy to the direct current power distribution subsystem; and the energy of the energy storage module is converted into alternating current through the third port and the second port of the power electronic transformer through inversion, and the energy is provided for the alternating current distribution subsystem.

And S140, the alternating current power supply subsystem supplies energy to the direct current distribution subsystem and the alternating current distribution subsystem through the power electronic transformer.

When the alternating current power supply subsystem does not have a fault, the power distribution system normally operates, the power electronic transformer and each subsystem operate on line, and at the moment, the power distribution system can be called to operate in a full operation mode. In the mode, the energy of the alternating current power supply subsystem is transmitted to the alternating current power distribution subsystem through the first port and the second port of the power electronic transformer through overvoltage transformation; and the energy of the alternating current power supply subsystem is converted into direct current through the first port and the third port of the power electronic transformer through rectification, and is transmitted to the direct current power distribution subsystem.

On the basis of the foregoing embodiments, optionally, the control method of the power distribution system further includes the following steps:

judging whether the alternating current power distribution subsystem has a fault; if yes, executing the next step; if not, the full operation mode is continued.

Wherein, the alternating current power distribution subsystem fault can include: faults such as grounding, bird strike and the like occur on a bus in the alternating current power distribution subsystem, equipment in the alternating current power distribution subsystem fails and the like occur; it may also be included that the second port of the power electronic transformer fails for internal or external reasons.

Controlling the AC power distribution subsystem to be powered off; the ac power supply subsystem provides energy to the dc power distribution subsystem through the power electronics transformer.

When the alternating current distribution subsystem breaks down, the second port of the power electronic transformer is controlled to be locked, the connection between the power electronic transformer and the alternating current distribution subsystem is cut off, and the energy required by the direct current distribution subsystem is provided by the alternating current power supply subsystem. The power distribution system may now be said to operate in the third bus bar mode of operation. In the mode, the alternating current power distribution subsystem is directly powered off because other energy sources are not involved; the energy of the alternating current power supply subsystem is converted into direct current through the first port and the third port of the power electronic transformer through rectification, and the direct current is transmitted to the direct current power distribution subsystem.

judging whether the direct current power distribution subsystem has a fault; if yes, executing the next step; if not, the full operation mode is continued.

Wherein, the direct current distribution subsystem fault can include: faults such as grounding, bird strike and the like occur on a bus in the direct current power distribution subsystem, equipment in the direct current power distribution subsystem fails and the like occur; it may also be included that the third port of the power electronic transformer fails for internal or external reasons.

Controlling the disconnection between the power electronic transformer and the direct current distribution subsystem; the energy storage module provides energy to the direct current power distribution subsystem.

When the direct current distribution subsystem breaks down, the third port of the power electronic transformer is controlled to be locked, the connection between the power electronic transformer and the direct current distribution subsystem is cut off, and the energy required by the alternating current distribution subsystem is provided by the alternating current power supply subsystem. The power distribution system may now be said to operate in the second bus bar mode of operation. In the mode, an energy storage module in the direct current power distribution subsystem provides energy for the direct current power distribution subsystem; the energy of the AC power supply subsystem is transmitted to the AC power distribution subsystem through the overvoltage transformation through the first port and the second port of the power electronic transformer.

and when the alternating current distribution subsystem and the direct current distribution subsystem both have faults, the second port and the third port of the power electronic transformer are controlled to be locked. At the moment, only the PET in the power distribution system runs in an idle mode, and the operation mode is called a PET single-machine operation mode.

The above embodiments exemplarily show five operation modes of the power distribution system, and in order to more clearly explain the function of the power electronic transformer when the power distribution system is switched between different operation modes, the following description is made with reference to fig. 4. Fig. 4 is a schematic diagram of an operation mode of a power distribution system according to an embodiment of the present invention. Referring to fig. 4, on the basis of the above embodiment, optionally, the operation of the power distribution system includes: the system comprises five operation modes, namely a full operation mode, an off-grid operation mode, a second bus operation mode, a third bus operation mode and a PET single machine operation mode.

When the power distribution system is switched from the full operation mode to the second bus operation mode, the third port of the PET needs to be controlled to be locked, otherwise, the third port of the PET is controlled to be conducted. When the power distribution system is switched from the full operation mode to the third bus operation mode, the second port of the PET needs to be controlled to be locked, and otherwise, the second port of the PET is controlled to be conducted. When the power distribution system is switched from the full operation mode to the off-grid mode, the first port of the PET needs to be controlled to be locked, and otherwise, the first port of the PET is controlled to be switched on. When the power distribution system is switched from the full operation mode to the PET single machine operation mode, the second port and the third port of the PET are required to be controlled to be locked, otherwise, the second port and the third port of the PET are controlled to be switched on. When the power distribution system is switched from the second bus operation mode to the PET single-machine operation mode, the second port of the PET needs to be controlled to be locked, otherwise, the second port of the PET is controlled to be conducted. When the power distribution system is switched from the third bus operation mode to the PET single machine operation mode, the third port of the PET needs to be controlled to be locked, otherwise, the third port of the PET is controlled to be conducted.

Fig. 5 is a schematic flowchart of full-operation startup of a power distribution system according to an embodiment of the present invention. The following describes a start-up procedure in the full operation mode of the power distribution system with reference to fig. 5. Optionally, the power distribution system full operation startup comprises the following steps:

and S210, closing the first breaker.

S220, judging whether the first bus is electrified or not; if yes, go to S230; otherwise, ending the starting.

And S230, starting a first port of the power electronic transformer.

S240, judging whether the power electronic transformer is electrified or not; if yes, executing S250; otherwise, ending the starting.

And S250, closing the second breaker.

And S260, starting a second port of the power electronic transformer.

S270, judging whether the second bus is electrified or not; if yes, go to step S280; otherwise, ending the starting.

And S280, closing a third breaker.

And S290, starting a third port of the power electronic transformer.

S2A0, judging whether the third bus is electrified or not; if yes, go to S2B 0; otherwise, ending the starting.

And S2B0, closing a fourth breaker.

S2C0, judging whether the energy storage unit is normally connected to the third bus; if yes, perform S2D 0; otherwise, ending the starting.

And S2D0, closing a fifth breaker.

S2E0, judging whether the new energy power generation unit is normally connected to the third bus; if yes, go to S2F 0; otherwise, ending the starting.

And S2F0, completing the starting of the full operation of the power distribution system.

In summary, the starting process of the power distribution system in the full operation mode is realized through S210-S2F 0. For the power electronic transformer, the process of starting in the full operation mode is the process of sequentially starting each port, and for each subsystem, the process of starting in the full operation mode is the process of establishing the connection between the subsystem and the power electronic transformer. It should be noted that, in each stage, it is necessary to check whether the system is operating normally, and only under normal conditions, the next step can be performed, otherwise, the system is stopped and operations such as fault handling are performed.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An electrical distribution system, comprising:

2. The power distribution system of claim 1, wherein the ac power subsystem comprises: a first bus and a first circuit breaker;

3. The power distribution system of claim 1, wherein the ac power distribution subsystem comprises: a second bus, a second circuit breaker, and a first load;

4. The power distribution system of claim 3, wherein the first load comprises: at least one of air conditioning, lighting, electrical outlets, and power equipment.

5. The power distribution system of claim 1, wherein the dc power distribution subsystem further comprises: a third bus, a third circuit breaker, and a second load;

6. The power distribution system of claim 5, wherein the energy storage module comprises: the energy storage unit, the new energy power generation unit, the fourth circuit breaker and the fifth circuit breaker;

7. The power distribution system of claim 5, wherein the second load comprises: at least one of a server, an automobile charging pile, a direct current air conditioner, direct current lighting and a direct current socket.

8. A method of controlling a power distribution system, comprising:

judging whether the AC power supply subsystem fails;

9. The method of controlling a power distribution system according to claim 8, further comprising:

10. The method of controlling a power distribution system according to claim 8, further comprising:

judging whether the direct current power distribution subsystem has a fault;