CN110943457B - Distributed power flow control system and method - Google Patents
Distributed power flow control system and method Download PDFInfo
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- CN110943457B CN110943457B CN201811118870.3A CN201811118870A CN110943457B CN 110943457 B CN110943457 B CN 110943457B CN 201811118870 A CN201811118870 A CN 201811118870A CN 110943457 B CN110943457 B CN 110943457B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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Abstract
The invention provides a distributed power flow control system and a distributed power flow control method, which comprise the following steps: the distributed power flow controller, the main controller and the energy management module are arranged; the main controller is connected with the energy management module and the distributed power flow controller; the distributed power flow controllers are distributed, arranged on the strain tower and used for acquiring running data and self state information of the line and transmitting the running data and the self state information to the main controller; executing a corresponding working mode according to the adjusting instruction; the main controller generates a regulating instruction based on the received regulating target and a preset control strategy, transmits the regulating instruction to the distributed power flow controller, and transmits data uploaded by the distributed power flow controller to the energy management module; and the energy management module combines a scheduling plan according to the equipment state information and the power transmission line data sent by the master controller, formulates a power transmission line regulation target and transmits the power transmission line regulation target to the master controller. The distributed power flow controller provided by the invention has the advantages of higher reliability, convenience in installation and maintenance, electromagnetic interference resistance and compact structure.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a distributed power flow control system and a distributed power flow control method.
Background
In an electric power system without any power flow control device, the power flow of a power grid is naturally distributed mainly according to impedance functions of a system power transmission line and the like, and compared with a high-impedance power transmission line, the low-impedance power transmission line bears larger system power flow. However, such a naturally formed uncontrolled power flow distribution is not generally the desired power flow distribution for system operation, and may cause a series of problems such as insufficient transmission capacity, large transmission loss, out-of-limit voltage, and even damage to system stability.
In order to improve the tidal current distribution of the system, the electric power system mainly adopts the counter measures of newly built power plants and power transmission lines for a long time; however, a large amount of valuable land resources are occupied by newly-built power plants and power transmission lines, and the construction cost is high and the period is long. Therefore, an idea and a scheme for modifying and upgrading the existing line by adopting a power electronic technology are proposed, namely, a Flexible AC Transmission System (FACTS) is adopted, so as to achieve the purposes of controlling the System current and improving the System stability level and the Transmission capacity.
The FACTS technology is a product of combining modern power electronic technology and traditional power flow control technology, can reasonably control system power flow and node voltage, reduces power loss and power generation cost, and greatly improves stability and economy of system operation. However, the centralized large FACTS equipment has a complex structure, a large floor area, a high one-time investment cost, and a high requirement for daily operation and maintenance personnel, and the reliability of the control and protection system, the power electronic devices, the cooling system, and the like of the centralized large FACTS equipment is yet to be further improved. Aiming at the requirements of flexibly adjusting system parameters and network structures, improving the response speed of a control device and controlling the trend and distribution of power grid flow, the power science research institute of the United states and West House company in the 80 th century proposed a flexible alternating current transmission technology FACTS. Depending on the connection, FACTS controllers can be divided into parallel compensation devices (e.g. static var compensators, static synchronous compensators), series compensation devices (e.g. controllable series compensation) and series-parallel compensation devices (e.g. unified power flow controllers).
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a distributed power flow control method and a distributed power flow control system.
A distributed power flow control system, comprising: the system comprises a plurality of distributed power flow controllers, a master controller and an energy management module;
the main controller is respectively connected with the energy management module and the distributed power flow controller;
the distributed power flow controller is used for: collecting the running data of the line and the state information of the line, and transmitting the running data and the state information to the main controller; executing corresponding working modes according to the adjusting instructions sent by the main controller, wherein the distributed power flow controllers are respectively arranged on sub-control stations on the strain tower;
the master controller is used for: generating a regulating instruction based on the received energy management module regulating target and a preset control strategy, and transmitting the regulating instruction to the distributed power flow controller; the distributed power flow controller is also used for transmitting data uploaded by the distributed power flow controller to the energy management module;
the energy management module is to: and according to the equipment state information sent by the master controller and the data of the power transmission line, a scheduling plan is combined, an adjusting target of the power transmission line is made, and the adjusting target is transmitted to the master controller.
Preferably, the distributed power flow controller includes: the device comprises an electrical appliance assembly, a current sampling circuit and a control unit, wherein the electrical appliance assembly is coupled with the power transmission line;
the electrical component comprises a coupling transformer, a BPS module and a VSC module which are connected in parallel; wherein the BPS module comprises: the TBS module and the mechanical switch K are connected in parallel; the coupling transformer is coupled with the transmission line;
the current sampling circuit is configured to: collecting current information of the power transmission line;
the control unit is used for: analyzing the adjusting instruction sent by the main controller into a first adjusting instruction and a second adjusting instruction; the on-off of the mechanical switch K is controlled through the first adjusting instruction; the second regulating instruction is a pulse signal sent by the control unit to the VSC module.
Preferably, the distributed power flow controller further includes an energy obtaining circuit;
the energy taking circuit is used for: and carrying out work energy obtaining on the control unit.
Preferably, the electrical component further comprises: PT1 module, MOV module, current-limiting reactance, LC filtering module and capacitor;
the LC filtering module is connected with the VSC module in series and then connected with the capacitor in parallel;
connecting the parallel circuit and the current-limiting reactance in series;
connecting the series circuit in parallel with the BPS module;
the PT1 module is connected in parallel with the MOV module and then connected in parallel with the BPS module.
Preferably, the master controller is specifically configured to: and dividing the total input capacity by the capacity of the single distributed power flow controller to obtain the number of the distributed power flow controllers needing to be input.
Preferably, the energy management module is specifically configured to: and calculating the total capacity of the distributed power flow controller required to be invested according to a scheduling plan.
Preferably, the master controller and the energy management module EMS are arranged in a transformer substation;
the distributed power flow controller further comprises: a wireless communication module;
the substation further comprises: a wireless transceiver module;
the distributed power flow controller is communicated with the master controller through the wireless communication module and the wireless transceiving module.
Preferably, the distributed power flow controller communicates with the master controller through the wireless communication module and the wireless transceiver module, and the wireless communication module communicates with the wireless transceiver module through a GPRS general channel or a LORA dedicated channel.
A distributed power flow control method, comprising:
the distributed power flow controller collects the running data of the line and the state information of the distributed power flow controller and transmits the running data and the state information to the main controller;
the main controller transmits the data uploaded by the distributed power flow controller to an energy management module;
the energy management module combines a scheduling plan based on the state information of each distributed power flow controller and the operation data of the power transmission line, makes an adjusting target of the power transmission line, and transmits the adjusting target to the master controller;
the main controller calculates the number of distributed power flow controllers needing to be put into and the working modes of the put distributed power flow controllers based on the adjustment target, generates a scheduling instruction and transmits the scheduling instruction to the corresponding distributed power flow controllers;
and the distributed power flow controller executes the adjusting instruction to realize distributed power flow control.
Preferably, the energy management module makes an adjustment target of the power transmission line based on the status information of each distributed power flow controller and the operation data of the power transmission line in combination with a scheduling plan, and transmits the adjustment target to the master controller, including:
and the adjusting target is that the energy management module calculates the total capacity of the distributed power flow controller which needs to be invested according to a scheduling plan.
Preferably, the master controller calculates the number of distributed power flow controllers to be invested and the working modes of the invested distributed power flow controllers based on the adjustment target, generates a scheduling instruction, and transmits the scheduling instruction to the corresponding distributed power flow controllers, and the method includes:
and the main controller divides the total capacity to be input by the capacity of a single distributed power flow controller according to the power flow distribution condition of the power transmission line to obtain the quantity of the distributed power flow controllers to be input as a control instruction.
Preferably, the selecting the corresponding operation mode according to the adjustment target includes:
when the system needs to realize multi-stage impedance adjustment, a small-capacity series reactor mode 1 is adopted;
when the adjustment target is that the distributed power flow controller is required to be low in power consumption and power electronic devices in the circuit are free of high-frequency turn-off loss, a small-capacity series reactor mode 2 is adopted;
when capacitive compensation or inductive compensation is required to be carried out on a power transmission system line to realize rapid and continuous impedance adjustment, a high-capacity reactive injection mode is adopted;
when the power transmission line has a fault of overlarge outgoing point current, a fault protection mode is adopted for protecting internal components of the distributed power flow controller from being damaged.
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
in the distributed power flow control system, the main controller and the energy management module are split into remote controls, so that the size and the weight of the body are reduced to the greatest extent, a large amount of civil construction cost is saved, the distributed power flow controller is small in size, compact in structure, convenient to install and maintain, capable of being directly hung on the strain tower and free of occupying ground land resources.
Drawings
FIG. 1 is a block diagram of a power flow control system according to the present invention;
FIG. 2 is a diagram of a distributed power flow controller of the present invention;
fig. 3 is a flowchart of a distributed power flow control method according to the present invention.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the drawings in the specification.
As shown in fig. 1, the distributed power flow control system provided by the present invention includes: the distributed power flow controller, the main controller and the energy management module are arranged;
the main controller is respectively connected with the energy management module and the distributed power flow controller;
the distributed power flow controller is used for: collecting the running data of the line and the state information of the line, and transmitting the running data and the state information to the main controller; executing a corresponding working mode according to an adjusting instruction sent by the main controller; the distributed power flow controller corresponds to a DPFC subunit in this embodiment;
the master controller is used for: generating a regulating instruction based on the received energy management module regulating target and a preset control strategy, and transmitting the regulating instruction to the distributed power flow controller; the distributed power flow controller is also used for transmitting data uploaded by the distributed power flow controller to the energy management module;
the energy management module is to: and according to the equipment state information sent by the master controller and the data of the power transmission line, a scheduling plan is combined, an adjusting target of the power transmission line is made, and the adjusting target is transmitted to the master controller.
As shown in fig. 2, the distributed power flow controller includes: the device comprises an electrical appliance assembly, a current sampling circuit and a control unit, wherein the electrical appliance assembly is coupled with the power transmission line;
the electrical component comprises a coupling transformer, a BPS module and a VSC module which are connected in parallel; wherein the BPS module comprises: the TBS module and the mechanical switch K are connected in parallel; the coupling transformer is coupled with the transmission line;
the current sampling circuit is configured to: collecting current information of the power transmission line;
the control unit is used for: analyzing the adjusting instruction sent by the main controller into a first adjusting instruction and a second adjusting instruction; the on-off of the mechanical switch K is controlled through the first adjusting instruction; the second regulating instruction is a pulse signal sent by the control unit to the VSC module.
The distributed power flow controller also comprises an energy taking circuit;
the energy taking circuit is used for: and carrying out work energy obtaining on the control unit.
The electrical component further comprises: PT1 module, MOV module, current-limiting reactance, LC filtering module and capacitor;
the LC filter module is connected with the VSC module in series and then connected with the capacitor in parallel;
connecting the parallel circuit with the current-limiting reactance in series;
connecting the series circuit in parallel with the BPS module;
the PT1 module is connected in parallel with the MOV module and then connected in parallel with the BPS module.
The master controller is specifically configured to: and dividing the total input capacity by the capacity of a single distributed power flow controller to obtain the number of distributed power flow controllers needing to be input.
The energy management module is specifically configured to: and calculating the total capacity of the distributed power flow controller required to be invested according to a scheduling plan.
The distributed power flow controller is a sub-control station arranged on the strain tower;
the master controller and the energy management module EMS are arranged in the transformer substation;
the distributed power flow controller further comprises: a wireless communication module;
the substation further comprises: a wireless transceiver module;
the distributed power flow controller is communicated with the master controller through the wireless communication module and the wireless transceiving module.
The distributed power flow controller is communicated with the master controller through the wireless communication module and the wireless transceiving module, and the wireless communication module is communicated with the wireless transceiving module through a General Packet Radio Service (GPRS) general channel or a long distance radio (LORA) special channel.
As shown in fig. 3, based on the same inventive concept, the present invention further provides a distributed power flow control method, which is characterized by comprising:
the distributed power flow controller collects the running data of the line and the state information of the distributed power flow controller and transmits the running data and the state information to the main controller;
the main controller transmits the data uploaded by the distributed power flow controller to an energy management module;
the energy management module combines a scheduling plan based on the state information of each distributed power flow controller and the operation data of the power transmission line, makes an adjusting target of the power transmission line, and transmits the adjusting target to the master controller;
the main controller calculates the number of distributed power flow controllers needing to be put into and the working modes of the put distributed power flow controllers based on the adjustment target, generates a scheduling instruction and transmits the scheduling instruction to the corresponding distributed power flow controllers;
and the distributed power flow controller executes the adjusting instruction to realize distributed power flow control.
The energy management module combines a scheduling plan based on the state information of each distributed power flow controller and the operation data of the power transmission line, makes an adjusting target of the power transmission line, and transmits the adjusting target to the main controller, and the energy management module comprises:
and the adjusting target is that the energy management module calculates the total capacity of the distributed power flow controller which needs to be invested according to a scheduling plan.
The main controller calculates the number of distributed power flow controllers needing to be invested and the working modes of the invested distributed power flow controllers based on the adjustment target, generates a scheduling instruction and transmits the scheduling instruction to the corresponding distributed power flow controllers, and the method comprises the following steps:
and the main controller divides the total capacity to be input by the capacity of a single distributed power flow controller according to the power flow distribution condition of the power transmission line to obtain the quantity of the distributed power flow controllers to be input as a control instruction.
The selecting the corresponding working mode according to the adjustment target comprises:
when the system needs to realize multi-stage impedance adjustment, a small-capacity series reactor mode 1 is adopted, a control unit in the distributed power flow controller blocks trigger pulses to enable a VSC module not to work, and the control unit controls a mechanical switch k to be opened to enable a secondary side of a coupling transformer to be open-circuited and to be equivalent to the excitation impedance of the coupling transformer of a series access system;
when the adjustment target is that the distributed power flow controller is required to have low power consumption and the power electronic devices in the circuit have no high-frequency turn-off loss, a small-capacity series reactor mode 2 is adopted, a control unit in the distributed power flow controller blocks trigger pulses to enable a VSC module to not work, and the control unit controls a mechanical switch K to be closed to enable a secondary side of a coupling transformer to be in short circuit, which is equivalent to leakage reactance of the coupling transformer of a series access system;
when capacitive compensation or inductive compensation is needed to be performed on a power transmission system line to achieve rapid and continuous impedance adjustment, a high-capacity reactive power injection mode is adopted, a control unit in the distributed power flow controller sends a trigger pulse to a VSC module, an LC filter enables a current waveform flowing into a coupling transformer to be a sine wave, and the control unit controls a mechanical switch K to be opened so that a voltage converter can output capacitive reactive power and inductive reactive power;
when the transmission line out-point current is in a too large fault, in order to protect internal components of the distributed power flow controller from being damaged, a fault protection mode is adopted, and a control unit in the distributed power flow controller sends a closing instruction to the TBS module and the mechanical switch K, so that the short-circuit current of the transmission line is not coupled on the VSC side. The distributed power flow controllers are distributed, the capacity of each distributed power flow controller is small, and the distributed power flow controllers achieve the same effect as a centralized unified power flow controller through a plurality of distributed distribution modes;
the GPRS and LORA wireless communication modes are adopted, and the two modes are mutually standby, so that the reliability of system operation is improved;
the distributed power flow controller is directly suspended on the line without complex insulation measures, the point position of the distributed power flow controller is completely the same as that of the power transmission line, insulation problems are not considered too much, and insulation cost is saved;
compared with a centralized unified power flow controller, the distributed power flow controller does not occupy a large amount of land resources, and a large amount of civil engineering construction cost is saved.
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 intended to illustrate the technical solution of the present invention and not to limit the same, and a person of ordinary skill in the art can make modifications or equivalents to the specific embodiments of the present invention with reference to the above embodiments, and such modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims of the present invention as set forth in the claims.
Claims (11)
1. A distributed power flow control system comprising: the system comprises a plurality of distributed power flow controllers, a master controller and an energy management module;
the main controller is respectively connected with the energy management module and the distributed power flow controller;
the distributed power flow controller is used for: collecting the running data of the line and the state information of the line, and transmitting the running data and the state information to the main controller; executing corresponding working modes according to the adjusting instructions sent by the main controller, wherein the distributed power flow controllers are respectively arranged on sub-control stations on the strain tower;
the master controller is used for: generating a regulating instruction based on the received energy management module regulating target and a preset control strategy, and transmitting the regulating instruction to the distributed power flow controller; the distributed power flow controller is also used for transmitting data uploaded by the distributed power flow controller to the energy management module;
the energy management module is to: according to the equipment state information sent by the master controller and the data of the power transmission line, a scheduling plan is combined, an adjusting target of the power transmission line is made, and the adjusting target is transmitted to the master controller;
the distributed power flow control method realized by the system is characterized by comprising the following steps:
the distributed power flow controller collects the running data of the line and the state information of the distributed power flow controller and transmits the running data and the state information to the main controller;
the master controller transmits the data uploaded by the distributed power flow controller to an energy management module;
the energy management module combines a scheduling plan based on the state information of each distributed power flow controller and the operation data of the power transmission line, makes an adjusting target of the power transmission line, and transmits the adjusting target to the master controller;
the main controller calculates the number of distributed power flow controllers needing to be put into and the working modes of the put distributed power flow controllers based on the adjustment target, generates a scheduling instruction and transmits the scheduling instruction to the corresponding distributed power flow controllers;
the distributed power flow controller executes the adjusting instruction to realize distributed power flow control;
selecting a corresponding working mode according to the adjustment target, comprising:
when the system needs to realize multi-stage impedance adjustment, a small-capacity series reactor mode 1 is adopted; a control unit in the distributed power flow controller blocks the trigger pulse to enable the VSC module not to work, and controls a mechanical switch k to be opened to enable a secondary side of the coupling transformer to be open-circuited and to be equivalent to the excitation impedance of the coupling transformer of a series access system;
when the adjustment target is that the distributed power flow controller is required to be low in power consumption and power electronic devices in the circuit are free of high-frequency turn-off loss, a small-capacity series reactor mode 2 is adopted; a control unit in the distributed power flow controller blocks the trigger pulse to enable the VSC module to not work, controls a mechanical switch K to be closed to enable a secondary side of the coupling transformer to be in short circuit, and is equivalent to the leakage reactance of the coupling transformer connected into a system in series;
when capacitive compensation or inductive compensation is required to be carried out on a power transmission system line to realize rapid and continuous impedance adjustment, a high-capacity reactive injection mode is adopted;
when the power transmission line has a fault of overlarge current, a fault protection mode is adopted for protecting internal components of the distributed power flow controller from being damaged.
2. The distributed power flow control system of claim 1, wherein the distributed power flow controller comprises: the device comprises an electrical component, a current sampling circuit and a control unit, wherein the electrical component is coupled with the power transmission line;
the electrical component comprises a coupling transformer, a BPS module and a VSC module which are connected in parallel; wherein the BPS module comprises: the TBS module and the mechanical switch K are connected in parallel; the coupling transformer is coupled with the transmission line;
the current sampling circuit is configured to: collecting current information of the power transmission line;
the control unit is used for: analyzing the adjusting instruction sent by the main controller into a first adjusting instruction and a second adjusting instruction; the on-off of the mechanical switch K is controlled through the first adjusting instruction; the second regulating instruction is a pulse signal sent by the control unit to the VSC module.
3. The distributed power flow control system of claim 1, wherein the distributed power flow controller further comprises an energy extraction circuit;
the energy taking circuit is used for: and carrying out work energy obtaining on the control unit.
4. The distributed power flow control system of claim 2, wherein the appliance assembly further comprises: PT1 module, MOV module, current-limiting reactance, LC filtering module and capacitor;
the LC filtering module is connected with the VSC module in series and then connected with the capacitor in parallel;
connecting the parallel circuit and the current-limiting reactance in series to form a series circuit;
connecting the series circuit in parallel with the BPS module;
the PT1 module is connected in parallel with the MOV module and then connected in parallel with the BPS module.
5. The distributed power flow control system of claim 1, wherein the master controller is specifically configured to: and dividing the total input capacity by the capacity of a single distributed power flow controller to obtain the number of distributed power flow controllers needing to be input.
6. The distributed power flow control system of claim 1, wherein the energy management module is specifically configured to: and calculating the total capacity of the distributed power flow controller required to be invested according to a scheduling plan.
7. The distributed power flow control system of claim 1, wherein the master controller and the energy management module (EMS) are arranged in a substation;
the distributed power flow controller further comprises: a wireless communication module;
the substation further comprises: a wireless transceiver module;
the distributed power flow controller is communicated with the master controller through the wireless communication module and the wireless transceiving module.
8. The distributed power flow control system of claim 7, wherein the distributed power flow controller communicates with the master controller via the wireless communication module and the wireless transceiving module, comprising:
the wireless communication module communicates with the wireless transceiver module through a GPRS general channel or a LORA dedicated channel.
9. A distributed power flow control method, comprising:
the distributed power flow controller collects the running data of the line and the state information of the distributed power flow controller and transmits the running data and the state information to the main controller;
the main controller transmits the data uploaded by the distributed power flow controller to an energy management module;
the energy management module combines a scheduling plan based on the state information of each distributed power flow controller and the operation data of the power transmission line, makes an adjusting target of the power transmission line, and transmits the adjusting target to the master controller;
the main controller calculates the number of distributed power flow controllers needing to be put into and the working modes of the put distributed power flow controllers based on the adjustment target, generates a scheduling instruction and transmits the scheduling instruction to the corresponding distributed power flow controllers;
the distributed power flow controller executes the scheduling instruction to realize distributed power flow control;
selecting a corresponding working mode according to the adjustment target, comprising:
when the system needs to realize multi-stage impedance adjustment, a small-capacity series reactor mode 1 is adopted; a control unit in the distributed power flow controller blocks the trigger pulse to enable the VSC module not to work, and controls a mechanical switch k to be opened to enable a secondary side of the coupling transformer to be open-circuited and to be equivalent to the excitation impedance of the coupling transformer of a series access system;
when the adjustment target is that the distributed power flow controller is required to be low in power consumption and power electronic devices in the circuit are free of high-frequency turn-off loss, a small-capacity series reactor mode 2 is adopted; a control unit in the distributed power flow controller blocks the trigger pulse to enable the VSC module not to work, controls a mechanical switch K to be closed to enable a secondary side of the coupling transformer to be in short circuit, and is equivalent to leakage reactance of the coupling transformer of a series access system;
when capacitive compensation or inductive compensation is required to be carried out on a power transmission system line to realize rapid and continuous impedance adjustment, a high-capacity reactive injection mode is adopted;
when the power transmission line has a fault of overlarge current, a fault protection mode is adopted for protecting internal components of the distributed power flow controller from being damaged.
10. The distributed power flow control method of claim 9, wherein the energy management module makes a regulation target of the power transmission line based on the status information of each distributed power flow controller and the operation data of the power transmission line in combination with a scheduling plan, and transmits the regulation target to the master controller, and comprises:
and the adjusting target is that the energy management module calculates the total capacity of the distributed power flow controller which needs to be invested according to a scheduling plan.
11. The distributed power flow control method according to claim 9, wherein the master calculates the number of distributed power flow controllers to be invested and the operation mode of the invested distributed power flow controllers based on the adjustment target, generates a scheduling instruction, and transmits the scheduling instruction to the corresponding distributed power flow controllers, and comprises:
and the main controller divides the total capacity to be input by the capacity of a single distributed power flow controller according to the power flow distribution condition of the power transmission line to obtain the quantity of the distributed power flow controllers to be input as a control instruction.
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