CN113890121A - Alternating current-direct current wide area cooperative control system and method - Google Patents

Alternating current-direct current wide area cooperative control system and method Download PDF

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Publication number
CN113890121A
CN113890121A CN202111094480.9A CN202111094480A CN113890121A CN 113890121 A CN113890121 A CN 113890121A CN 202111094480 A CN202111094480 A CN 202111094480A CN 113890121 A CN113890121 A CN 113890121A
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power
direct current
frequency
current network
alternating current
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CN113890121B (en
Inventor
邢欢
庞学跃
刘昊一
张仕鹏
刘一鸣
许琴
杨至元
丘国斌
孙浩
古一灿
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China Energy Engineering Group Guangdong Electric Power Design Institute Co Ltd
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China Energy Engineering Group Guangdong Electric Power Design Institute Co Ltd
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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
    • H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
    • H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
    • 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • H02J3/144—Demand-response operation of the power transmission or distribution network
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses an alternating current-direct current wide area cooperative control system and a method, wherein the system comprises: the comprehensive defense subsystem is used for generating a frequency characteristic equation of the power system according to the frequency and the power of the power system; the alternating current control master station is used for acquiring a first power fluctuation value of the alternating current network and transmitting the first power fluctuation value to the direct current coordination control master station; the direct current coordination control master station is used for calculating a first power adjustment value to be adjusted according to the first power fluctuation value and the frequency characteristic equation and adjusting the power of each direct current loop based on the first power adjustment value; and the power control unit is used for acquiring a second power fluctuation value of the direct current network, calculating a second power adjustment value required to be adjusted according to the frequency characteristic equation and the second power fluctuation value, and performing power adjustment on each direct current loop based on the second power adjustment value. The invention can carry out cooperative control after the fault on the transmitting end and the receiving end of the AC/DC hybrid regional power grid system.

Description

Alternating current-direct current wide area cooperative control system and method
Technical Field
The invention relates to the technical field of power grids, in particular to an alternating current-direct current wide-area cooperative control system and method.
Background
The network security relation of the national civilians has been highly valued by academic and industrial circles. Almost all major power failure accidents are not caused by a single reason, various time scale elements are mutually influenced in the accident process, and various kinds of stability problems are interwoven and mutually converted to form a complex development and change process. In order to prevent large-area power failure, a stable control method for multiple direct-current faults of a direct-current receiving end power grid exists in the prior art, and the method specifically comprises the steps of calculating the load shedding quantity required by each regional load shedding substation according to the load shedding quantity and direct-current loss power when the direct-current receiving end network is detected to have the direct-current faults, and then according to the load shedding quantity required to be shed, cutting off the load according to the priority of the load accessed by each regional load shedding substation.
However, the method only needs to be matched with a stable control generator tripping machine and a load shedding measure to form multiple strategies, the strategies are often complex, the process of recovering the generator set after the generator set is cut off is slow, and power supply recovery is slow. In addition, the method only aims at the direct current transmitting end network, and cannot carry out wide area cooperative control on the transmitting end and the receiving end of a regional power grid system which is in alternating current and direct current mixed connection with the outside.
Disclosure of Invention
The embodiment of the invention provides an alternating current and direct current wide area cooperative control system and method, which can perform cooperative control after a fault on a sending end and a receiving end of a regional power grid system in alternating current and direct current mixed connection, and can reduce the influence on a power grid after the fault on load shedding operation without performing complex generator tripping.
An embodiment of the present invention provides an ac/dc wide area cooperative control system, including: the system comprises a direct current coordination control main station, an alternating current control main station and a comprehensive defense subsystem; the direct current coordination control master station is provided with a frequency limit controller;
the comprehensive defense subsystem is used for monitoring the frequency and the power of the power system and generating a frequency characteristic equation of the power system according to the frequency and the power of the power system;
the alternating current control master station is used for acquiring a first power fluctuation value of an alternating current network when the alternating current network of the power system fails and transmitting the first power fluctuation value to the direct current coordination control master station; the alternating current network comprises a transmitting end alternating current network and a receiving end alternating current network;
the direct current coordination control master station is configured to calculate a first frequency fluctuation value of an alternating current network according to the first power fluctuation value and the frequency characteristic equation, calculate a first power adjustment value to be adjusted according to the first frequency fluctuation value and a frequency limit threshold of the frequency limit controller, and then perform power adjustment on each direct current loop through the frequency limit controller based on the first power adjustment value; and the number of the first and second groups,
the frequency limiting controller is used for acquiring a second power fluctuation value of the direct current network when the direct current network of the power system fails, calculating a second frequency fluctuation value of the direct current network according to the frequency characteristic equation and the second power fluctuation value, calculating a second power adjustment value required to be adjusted according to the second frequency fluctuation value and the frequency limiting threshold value, and then adjusting the power of each direct current loop through the frequency limiting controller based on the second power adjustment value; the direct current network comprises a sending end direct current network and a receiving end direct current network.
Further, based on the first power adjustment value, performing power adjustment on each dc loop through the frequency limitation controller specifically includes:
if the alternating current network of the sending end fails and the frequency of the alternating current network of the sending end is reduced, reducing the power of each direct current loop through the frequency limit controller based on the first power adjustment value;
if the alternating current network of the sending end fails and the frequency of the alternating current network of the sending end rises, the power of each direct current loop is increased through the frequency limit controller based on the first power adjustment value;
if the alternating current network of the receiving end fails and the frequency of the alternating current network of the receiving end is reduced, the power of each direct current loop is increased through the frequency limit controller based on the first power adjustment value;
and if the alternating current network of the receiving end fails and the frequency of the alternating current network of the receiving end rises, reducing the power of each direct current loop through the frequency limit controller based on the first power adjustment value.
Further, based on the second power adjustment value, performing power adjustment on each dc loop through the frequency limitation controller specifically includes:
if the direct current network of the sending end fails and the frequency of the direct current network of the sending end is reduced, reducing the power of each direct current loop through the frequency limit controller based on the second power adjustment value;
if the direct current network of the sending end fails and the frequency of the direct current network of the sending end rises, the power of each direct current loop is increased through the frequency limit controller based on the second power adjustment value;
if the direct current network of the receiving end fails and the frequency of the direct current network of the receiving end is reduced, the power of each direct current loop is increased through the frequency limit controller based on the second power adjustment value;
and if the direct current network of the receiving end fails and the frequency of the direct current network of the receiving end rises, reducing the power of each direct current loop through the frequency limit controller based on the second power adjustment value.
On the basis of the system item embodiment, the invention correspondingly provides a method item embodiment;
an embodiment of the present invention provides an ac/dc wide area cooperative control method, which is applicable to be executed in a dc coordinated control master station, and includes:
when an alternating current network of the power system fails, acquiring a first power fluctuation value of the alternating current network transmitted by an alternating current control master station; the alternating current network comprises an alternating current network of a sending end and an alternating current network of a receiving end; when a direct current network of the power system breaks down, acquiring a second power fluctuation value of the direct current network; acquiring a frequency characteristic equation of a current system; wherein the frequency characteristic equation is generated by the integrated defense subsystem according to the frequency and the power of the power system;
calculating a first frequency fluctuation value of the alternating current network according to the first power fluctuation value and a frequency characteristic equation, calculating a first power adjustment value required to be adjusted according to the first frequency fluctuation value and a frequency limit threshold value of a frequency limit controller, and then performing power adjustment on each direct current loop through the frequency limit controller based on the first power adjustment value;
calculating a second frequency fluctuation value of the direct current network according to the frequency characteristic equation and the second power fluctuation value, calculating a second power adjustment value required to be adjusted according to the second frequency fluctuation value and the frequency limit threshold value, and then performing power adjustment on each direct current loop through the frequency limit controller based on the second power adjustment value; the direct current network comprises a sending end direct current network and a receiving end direct current network.
Further, based on the first power adjustment value, performing power adjustment on each dc loop through the frequency limitation controller specifically includes:
if the alternating current network of the sending end fails and the frequency of the alternating current network of the sending end is reduced, reducing the power of each direct current loop through the frequency limit controller based on the first power adjustment value;
if the alternating current network of the sending end fails and the frequency of the alternating current network of the sending end rises, the power of each direct current loop is increased through the frequency limit controller based on the first power adjustment value;
if the alternating current network of the receiving end fails and the frequency of the alternating current network of the receiving end is reduced, the power of each direct current loop is increased through the frequency limit controller based on the first power adjustment value;
and if the alternating current network of the receiving end fails and the frequency of the alternating current network of the receiving end rises, reducing the power of each direct current loop through the frequency limit controller based on the first power adjustment value.
Further, based on the second power adjustment value, performing power adjustment on each dc loop through the frequency limitation controller specifically includes:
if the direct current network of the sending end fails and the frequency of the direct current network of the sending end is reduced, reducing the power of each direct current loop through the frequency limit controller based on the second power adjustment value;
if the direct current network of the sending end fails and the frequency of the direct current network of the sending end rises, the power of each direct current loop is increased through the frequency limit controller based on the second power adjustment value;
if the direct current network of the receiving end fails and the frequency of the direct current network of the receiving end is reduced, the power of each direct current loop is increased through the frequency limit controller based on the second power adjustment value;
and if the direct current network of the receiving end fails and the frequency of the direct current network of the receiving end rises, reducing the power of each direct current loop through the frequency limit controller based on the second power adjustment value.
The invention has the following beneficial effects:
the embodiment of the invention provides an alternating current-direct current wide area cooperative control system and method, for an alternating current-direct current hybrid power system, when a power network of a sending end or a receiving end of the power system has a fault, a direct current coordination control master station in the system regulates and controls the power of each direct current loop through a frequency limit controller, the alternating current-direct current wide area system control is realized, the direct operation of a generator tripping and a load shedding is avoided, the operation is simple, the influence on a power grid after the fault is reduced, and the rapid recovery of the power system is facilitated.
Drawings
Fig. 1 is a schematic structural diagram of an ac/dc wide-area cooperative control system according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an ac/dc wide-area cooperative control method according to an embodiment of the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
As shown in fig. 1, an embodiment of the present invention provides an ac/dc wide area cooperative control system, including:
referring to fig. 1, a schematic flow diagram of a method according to an embodiment of the present invention includes: the system comprises a direct current coordination control main station, an alternating current control main station and a comprehensive defense subsystem; the direct current coordination control master station is provided with a frequency limit controller;
the comprehensive defense subsystem is used for monitoring the frequency and the power of the power system and generating a frequency characteristic equation of the power system according to the frequency and the power of the power system;
the alternating current control master station is used for acquiring a first power fluctuation value of an alternating current network when the alternating current network of the power system fails and transmitting the first power fluctuation value to the direct current coordination control master station; the alternating current network comprises a transmitting end alternating current network and a receiving end alternating current network;
the direct current coordination control master station is configured to calculate a first frequency fluctuation value of an alternating current network according to the first power fluctuation value and the frequency characteristic equation, calculate a first power adjustment value to be adjusted according to the first frequency fluctuation value and a frequency limit threshold of the frequency limit controller, and then perform power adjustment on each direct current loop through the frequency limit controller based on the first power adjustment value; and the number of the first and second groups,
the frequency limiting controller is used for acquiring a second power fluctuation value of the direct current network when the direct current network of the power system fails, calculating a second frequency fluctuation value of the direct current network according to the frequency characteristic equation and the second power fluctuation value, calculating a second power adjustment value required to be adjusted according to the second frequency fluctuation value and the frequency limiting threshold value, and then adjusting the power of each direct current loop through the frequency limiting controller based on the second power adjustment value; the direct current network comprises a sending end direct current network and a receiving end direct current network.
In a preferred embodiment, the performing, by the frequency limitation controller, power adjustment on each dc loop based on the first power adjustment value specifically includes:
if the alternating current network of the sending end fails and the frequency of the alternating current network of the sending end is reduced, reducing the power of each direct current loop through the frequency limit controller based on the first power adjustment value;
if the alternating current network of the sending end fails and the frequency of the alternating current network of the sending end rises, the power of each direct current loop is increased through the frequency limit controller based on the first power adjustment value;
if the alternating current network of the receiving end fails and the frequency of the alternating current network of the receiving end is reduced, the power of each direct current loop is increased through the frequency limit controller based on the first power adjustment value;
and if the alternating current network of the receiving end fails and the frequency of the alternating current network of the receiving end rises, reducing the power of each direct current loop through the frequency limit controller based on the first power adjustment value.
In a preferred embodiment, the performing, by the frequency limitation controller, power adjustment on each dc loop based on the second power adjustment value specifically includes:
if the direct current network of the sending end fails and the frequency of the direct current network of the sending end is reduced, reducing the power of each direct current loop through the frequency limit controller based on the second power adjustment value;
if the direct current network of the sending end fails and the frequency of the direct current network of the sending end rises, the power of each direct current loop is increased through the frequency limit controller based on the second power adjustment value;
if the direct current network of the receiving end fails and the frequency of the direct current network of the receiving end is reduced, the power of each direct current loop is increased through the frequency limit controller based on the second power adjustment value;
and if the direct current network of the receiving end fails and the frequency of the direct current network of the receiving end rises, reducing the power of each direct current loop through the frequency limit controller based on the second power adjustment value.
The following is a detailed description of the various components of the system:
the integrated defense subsystem, the power grid operation management system and the data acquisition system are in data exchange, the embedded operation calculation server can perform safe and stable calculation and check according to the real-time operation state of the power grid, monitor the frequency and the power of the system in real time, generate a power-frequency curve, finally calculate the frequency regulation effect coefficient of the load according to the power-frequency curve, generate the frequency characteristic equation according to the frequency regulation effect coefficient of the load and feed back the frequency characteristic equation to the direct-current coordination control master station; the expression of the frequency characteristic equation is: Δ f ═ K (Δ P); in the formula, Δ f is a frequency change value of the power system in a preset time period, Δ P is a power change value of the power system in the preset time period, and K is a frequency adjustment effect coefficient of the load.
The alternating current control master station is mainly used for detecting alternating current networks of a sending end and a receiving end in the power system, and transmitting a power change value (namely the first power fluctuation value) of the alternating current network to the direct current coordination control master station through a scheduling data network when the alternating current networks are in failure; for example, the loss power of the fault of the large unit and the loss power of the fault of the important alternating current section are received and sent to the direct current coordination control main station.
A Frequency Limit Controller (FLC) is arranged in the direct current coordination control main station, and the power of each direct current loop can be regulated and controlled through the frequency limit controller, so that the function of emergency lifting or back-lowering of direct current power is realized, and the power system is kept stable.
Specifically, when an ac network of the power system fails, the dc coordinated control master station receives a first power fluctuation value transmitted by the ac control master station, then substitutes the first power fluctuation value into the frequency characteristic equation to calculate a first frequency fluctuation value, then calculates a frequency difference between the first frequency fluctuation value and a frequency limit threshold of the frequency limit controller, uses the frequency difference as a frequency amplitude to be adjusted during the adjustment, finally substitutes the frequency difference into the frequency characteristic equation, calculates a total power to be adjusted during the adjustment, that is, the first power adjustment value, and finally adjusts the dc power of N dc loops near a fault point based on the first power adjustment value, so that the total power value adjusted by the N dc loops is the first power adjustment value; n is a positive integer, and the specific numerical value can be set according to the actual situation;
the specific adjustment can be subdivided into the following cases:
1. when the ac network at the transmitting end fails and the frequency of the ac network at the transmitting end is reduced due to the failure, the dc power of each dc loop needs to be reduced by the frequency limit controller, so as to reduce the power output.
2. When the ac network at the transmitting end fails and the frequency of the ac network at the transmitting end increases due to the failure, the dc power of each dc loop needs to be increased by the frequency limit controller, so as to increase the power output.
3. When the ac network at the receiving end fails and the frequency of the ac network at the transmitting end is reduced due to the failure, the dc power of each dc loop needs to be increased by the frequency limit controller, so as to increase the power input.
4. When the ac network at the transmitting end fails and the frequency of the ac network at the transmitting end increases due to the failure, the dc power of each dc loop needs to be reduced by the frequency limit controller, so as to reduce the power input.
When the direct current network of the power system fails, the direct current coordination control master station directly detects a power fluctuation value of the direct current network, namely the second power fluctuation value, then brings the second power fluctuation value into the frequency characteristic equation to calculate a second frequency fluctuation value, then calculates a frequency difference value between the second frequency fluctuation value and a frequency limit threshold value of a frequency limit controller, takes the frequency difference value as a frequency amplitude to be adjusted during the adjustment, finally brings the frequency difference value into the frequency characteristic equation, calculates the total power required to be adjusted during the adjustment, namely the second power adjustment value, and finally adjusts the direct current power of the N direct current loops near the fault point based on the second power adjustment value, so that the sum of the power values adjusted by the N direct current loops is the second power adjustment value; n is a positive integer, and the specific numerical value can be set according to the actual situation;
similarly, it can be classified into the following 4 cases:
1. when the frequency of the sending-end dc network is reduced due to a fault, the dc power of each dc loop needs to be reduced by the frequency limit controller, so as to reduce the power output.
2. When the frequency of the sending-end dc network is increased due to a fault, the dc power of each dc loop needs to be increased by the frequency limit controller, so as to increase the power output.
3. When the dc network at the receiving end fails and the frequency of the dc network at the transmitting end is reduced due to the failure, the dc power of each dc loop needs to be increased by the frequency limit controller, so as to increase the power input.
4. When the frequency of the sending-end dc network is increased due to a fault, the dc power of each dc loop needs to be reduced by the frequency limit controller, so as to reduce the power input.
As shown in fig. 2, on the basis of the above embodiment of the system, the present invention correspondingly provides an embodiment of a method;
an embodiment of the present invention provides an ac/dc wide area cooperative control method, which is suitable for being executed in a dc coordinated control master station, and at least includes the following steps:
step S101: when an alternating current network of the power system fails, acquiring a first power fluctuation value of the alternating current network transmitted by an alternating current control master station; the alternating current network comprises an alternating current network of a sending end and an alternating current network of a receiving end; when a direct current network of the power system breaks down, acquiring a second power fluctuation value of the direct current network; acquiring a frequency characteristic equation of a current system; wherein the frequency characteristic equation is generated by the integrated defense subsystem according to the frequency and the power of the power system.
Step S102: and calculating a first frequency fluctuation value of the alternating current network according to the first power fluctuation value and a frequency characteristic equation, calculating a first power adjustment value required to be adjusted according to the first frequency fluctuation value and a frequency limit threshold value of a frequency limit controller, and then performing power adjustment on each direct current loop through the frequency limit controller based on the first power adjustment value.
In a preferred embodiment, the performing, by the frequency limitation controller, power adjustment on each dc loop based on the first power adjustment value specifically includes:
if the alternating current network of the sending end fails and the frequency of the alternating current network of the sending end is reduced, reducing the power of each direct current loop through the frequency limit controller based on the first power adjustment value;
if the alternating current network of the sending end fails and the frequency of the alternating current network of the sending end rises, the power of each direct current loop is increased through the frequency limit controller based on the first power adjustment value;
if the alternating current network of the receiving end fails and the frequency of the alternating current network of the receiving end is reduced, the power of each direct current loop is increased through the frequency limit controller based on the first power adjustment value;
and if the alternating current network of the receiving end fails and the frequency of the alternating current network of the receiving end rises, reducing the power of each direct current loop through the frequency limit controller based on the first power adjustment value.
Step S103: calculating a second frequency fluctuation value of the direct current network according to the frequency characteristic equation and the second power fluctuation value, calculating a second power adjustment value required to be adjusted according to the second frequency fluctuation value and the frequency limit threshold value, and then performing power adjustment on each direct current loop through the frequency limit controller based on the second power adjustment value; the direct current network comprises a sending end direct current network and a receiving end direct current network.
In a preferred embodiment, the performing, by the frequency limitation controller, power adjustment on each dc loop based on the second power adjustment value specifically includes:
if the direct current network of the sending end fails and the frequency of the direct current network of the sending end is reduced, reducing the power of each direct current loop through the frequency limit controller based on the second power adjustment value;
if the direct current network of the sending end fails and the frequency of the direct current network of the sending end rises, the power of each direct current loop is increased through the frequency limit controller based on the second power adjustment value;
if the direct current network of the receiving end fails and the frequency of the direct current network of the receiving end is reduced, the power of each direct current loop is increased through the frequency limit controller based on the second power adjustment value;
and if the direct current network of the receiving end fails and the frequency of the direct current network of the receiving end rises, reducing the power of each direct current loop through the frequency limit controller based on the second power adjustment value.
It should be noted that the specific implementation principle of each step in the above method embodiments is consistent with the principle described in the system item of the present invention, and is not described herein again.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (6)

1. An alternating current-direct current wide area cooperative control system is characterized by comprising: the system comprises a direct current coordination control main station, an alternating current control main station and a comprehensive defense subsystem; the direct current coordination control master station is provided with a frequency limit controller;
the comprehensive defense subsystem is used for monitoring the frequency and the power of the power system and generating a frequency characteristic equation of the power system according to the frequency and the power of the power system;
the alternating current control master station is used for acquiring a first power fluctuation value of an alternating current network when the alternating current network of the power system fails and transmitting the first power fluctuation value to the direct current coordination control master station; the alternating current network comprises a transmitting end alternating current network and a receiving end alternating current network;
the direct current coordination control master station is configured to calculate a first frequency fluctuation value of an alternating current network according to the first power fluctuation value and the frequency characteristic equation, calculate a first power adjustment value to be adjusted according to the first frequency fluctuation value and a frequency limit threshold of the frequency limit controller, and then perform power adjustment on each direct current loop through the frequency limit controller based on the first power adjustment value; and the number of the first and second groups,
the frequency limiting controller is used for acquiring a second power fluctuation value of the direct current network when the direct current network of the power system fails, calculating a second frequency fluctuation value of the direct current network according to the frequency characteristic equation and the second power fluctuation value, calculating a second power adjustment value required to be adjusted according to the second frequency fluctuation value and the frequency limiting threshold value, and then adjusting the power of each direct current loop through the frequency limiting controller based on the second power adjustment value; the direct current network comprises a sending end direct current network and a receiving end direct current network.
2. The ac-dc wide-area cooperative control system according to claim 1, wherein the power adjustment of each dc loop by the frequency limitation controller based on the first power adjustment value specifically includes:
if the alternating current network of the sending end fails and the frequency of the alternating current network of the sending end is reduced, reducing the power of each direct current loop through the frequency limit controller based on the first power adjustment value;
if the alternating current network of the sending end fails and the frequency of the alternating current network of the sending end is increased, increasing the power of each direct current loop through the frequency limit controller based on the first power adjustment value;
if the alternating current network of the receiving end fails and the frequency of the alternating current network of the receiving end is reduced, the power of each direct current loop is increased through the frequency limit controller based on the first power adjustment value;
and if the alternating current network of the receiving end fails and the frequency of the alternating current network of the receiving end rises, reducing the power of each direct current loop through the frequency limit controller based on the first power adjustment value.
3. The ac-dc wide-area cooperative control system according to claim 1, wherein the power adjustment of each dc loop by the frequency limitation controller based on the second power adjustment value specifically includes:
if the direct current network of the sending end fails and the frequency of the direct current network of the sending end is reduced, reducing the power of each direct current loop through the frequency limit controller based on the second power adjustment value;
if the direct current network of the sending end fails and the frequency of the direct current network of the sending end rises, the power of each direct current loop is increased through the frequency limit controller based on the second power adjustment value;
if the direct current network of the receiving end fails and the frequency of the direct current network of the receiving end is reduced, the power of each direct current loop is increased through the frequency limit controller based on the second power adjustment value;
and if the direct current network of the receiving end fails and the frequency of the direct current network of the receiving end rises, reducing the power of each direct current loop through the frequency limit controller based on the second power adjustment value.
4. An alternating current-direct current wide area cooperative control method is suitable for being executed in a direct current coordinated control main station, and is characterized by comprising the following steps:
when an alternating current network of the power system fails, acquiring a first power fluctuation value of the alternating current network transmitted by an alternating current control master station; the alternating current network comprises an alternating current network of a sending end and an alternating current network of a receiving end; when a direct current network of the power system breaks down, acquiring a second power fluctuation value of the direct current network; acquiring a frequency characteristic equation of a current system; wherein the frequency characteristic equation is generated by the integrated defense subsystem according to the frequency and the power of the power system;
calculating a first frequency fluctuation value of the alternating current network according to the first power fluctuation value and a frequency characteristic equation, calculating a first power adjustment value required to be adjusted according to the first frequency fluctuation value and a frequency limit threshold value of a frequency limit controller, and then performing power adjustment on each direct current loop through the frequency limit controller based on the first power adjustment value;
calculating a second frequency fluctuation value of the direct current network according to the frequency characteristic equation and the second power fluctuation value, calculating a second power adjustment value required to be adjusted according to the second frequency fluctuation value and the frequency limit threshold value, and then performing power adjustment on each direct current loop through the frequency limit controller based on the second power adjustment value; the direct current network comprises a sending end direct current network and a receiving end direct current network.
5. The ac-dc wide-area cooperative control method according to claim 4, wherein the performing, by the frequency limitation controller, power adjustment on each dc loop based on the first power adjustment value specifically includes:
if the alternating current network of the sending end fails and the frequency of the alternating current network of the sending end is reduced, reducing the power of each direct current loop through the frequency limit controller based on the first power adjustment value;
if the alternating current network of the sending end fails and the frequency of the alternating current network of the sending end rises, the power of each direct current loop is increased through the frequency limit controller based on the first power adjustment value;
if the alternating current network of the receiving end fails and the frequency of the alternating current network of the receiving end is reduced, the power of each direct current loop is increased through the frequency limit controller based on the first power adjustment value;
and if the alternating current network of the receiving end fails and the frequency of the alternating current network of the receiving end rises, reducing the power of each direct current loop through the frequency limit controller based on the first power adjustment value.
6. The ac-dc wide-area cooperative control system according to claim 4, wherein the power adjustment of each dc loop by the frequency limitation controller based on the second power adjustment value specifically includes:
if the direct current network of the sending end fails and the frequency of the direct current network of the sending end is reduced, reducing the power of each direct current loop through the frequency limit controller based on the second power adjustment value;
if the direct current network of the sending end fails and the frequency of the direct current network of the sending end rises, the power of each direct current loop is increased through the frequency limit controller based on the second power adjustment value;
if the direct current network of the receiving end fails and the frequency of the direct current network of the receiving end is reduced, the power of each direct current loop is increased through the frequency limit controller based on the second power adjustment value;
and if the direct current network of the receiving end fails and the frequency of the direct current network of the receiving end rises, reducing the power of each direct current loop through the frequency limit controller based on the second power adjustment value.
CN202111094480.9A 2021-09-17 2021-09-17 AC/DC wide area cooperative control system and method Active CN113890121B (en)

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Publication number Priority date Publication date Assignee Title
CN105552893A (en) * 2015-12-29 2016-05-04 中国电力科学研究院 DC frequency limiter control method
CN106208125A (en) * 2016-08-01 2016-12-07 国家电网公司 A kind of alternating current-direct current control method for coordinating tackling alternating current circuit catastrophe failure
CN106953351A (en) * 2017-05-16 2017-07-14 武汉大学 A kind of Asynchronous Interconnection sending emergency control method for tackling DC Line Fault
CN208352986U (en) * 2018-05-03 2019-01-08 南方电网科学研究院有限责任公司 Control device based on asynchronous power grid frequency characteristics

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105552893A (en) * 2015-12-29 2016-05-04 中国电力科学研究院 DC frequency limiter control method
CN106208125A (en) * 2016-08-01 2016-12-07 国家电网公司 A kind of alternating current-direct current control method for coordinating tackling alternating current circuit catastrophe failure
CN106953351A (en) * 2017-05-16 2017-07-14 武汉大学 A kind of Asynchronous Interconnection sending emergency control method for tackling DC Line Fault
CN208352986U (en) * 2018-05-03 2019-01-08 南方电网科学研究院有限责任公司 Control device based on asynchronous power grid frequency characteristics

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