CN114977336A - Control method and device for reactive compensation of wind power plant - Google Patents

Control method and device for reactive compensation of wind power plant Download PDF

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Publication number
CN114977336A
CN114977336A CN202210575976.6A CN202210575976A CN114977336A CN 114977336 A CN114977336 A CN 114977336A CN 202210575976 A CN202210575976 A CN 202210575976A CN 114977336 A CN114977336 A CN 114977336A
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China
Prior art keywords
wind power
power plant
reactive
equipment
wind
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Chinese (zh)
Inventor
耿庆峰
马鹏
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Huaneng Xinjiang Energy Development Co Ltd New Energy Dongjiang Branch
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Huaneng Xinjiang Energy Development Co Ltd New Energy Dongjiang Branch
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Priority to CN202210575976.6A priority Critical patent/CN114977336A/en
Publication of CN114977336A publication Critical patent/CN114977336A/en
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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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • 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
    • H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
    • H02J3/0075—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source according to economic or energy efficiency considerations, e.g. economic dispatch
    • 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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects
    • 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
    • Y02E40/30—Reactive power compensation

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

Abstract

The invention discloses a control method and a device for reactive compensation of a wind power plant, wherein the method comprises the steps that AVC of the wind power plant obtains a control plan of first equipment in a future period of time according to wind power prediction information and a reactive voltage control target, and sends the control plan to respective local controllers; and formulating a reactive compensation strategy based on the operation mode of the wind power plant, and carrying out reactive compensation on the wind power plant by the local controller according to the reactive compensation strategy. According to the method and the device, different compensation strategies are formulated according to different modes of the wind power plant, so that comprehensive application of each reactive compensation device is realized. The control robustness and reliability are obviously enhanced, and the safety of the wind power plant can still be preliminarily ensured under the condition of communication interruption. The reactive compensation equipment of the corresponding point is selectively selected to complete the corresponding function according to different characteristics of different reactive compensation equipment, and the overall effectiveness and integrity are improved.

Description

Control method and device for reactive power compensation of wind power plant
Technical Field
The application relates to the technical field of wind power plant control, in particular to a control method and device for reactive compensation of a wind power plant.
Background
Reactive compensation, also called reactive power compensation, plays a role in improving the power factor of a power grid in an electric power supply system, and by adding a reactive compensation device, reactive load and the reactive compensation device are subjected to no-power exchange and are not subjected to reactive power exchange with a power supply any more, so that the loss of a power supply transformer and a transmission line is reduced, the power supply efficiency is improved, and the power supply environment is improved. The implementation mode of reactive compensation is as follows: the device with capacitive load and inductive load are connected in parallel in the same circuit, energy is exchanged between the two loads, and reactive power needed by the inductive load can be compensated by the reactive power output by the capacitive load. Reactive compensation equipment applied to a wind farm includes a parallel capacitor bank, a Static Var Compensator (SVC), a static synchronous reactive compensator (STATCOM), and the like. Wind farm Automatic Voltage Control (AVC) system. With the adoption of the method, a Doubly Fed Induction Generator (DFIG) gradually replaces a cage type wind turbine and becomes a mainstream type, the reactive capacity of the DFIG is limited by the capacity of a rotor converter, the reactive capacity of the DFIG under high active power output is limited, the poor reactive demand of a wind power plant is very large, and the safety of the wind power plant cannot be guaranteed. Meanwhile, the larger the initial apparent power of the DFIG is, the more serious the overcurrent and overvoltage phenomena caused by the fault occurrence are, the lower the fault crossing possibility of the DFIG is, and the larger the damage to the power grid is. In order to ensure the voltage control quality under various working conditions, a plurality of reactive compensation devices are required to be comprehensively utilized by the wind power plant.
In the prior art, fluctuation changes of wind power in multiple time dimensions cannot be met only by a single type of reactive compensation means, and how to combine dynamic reactive compensation equipment and static reactive compensation equipment to perform reactive compensation is the key for developing reactive compensation technology. In addition, in the prior art, the wind power plant and the power grid are closely connected, the compensation process depends on the power grid too much, the disturbance duration time in the wind power plant is short in the actual operation process, and the compensation devices are difficult to communicate with the AVC of the wind power plant, so that the safety of the wind power plant is poor.
Therefore, how to organically combine various types of reactive compensation equipment for compensation, and when a wind farm is disturbed, communication is interrupted, so that the improvement of the safety of the wind farm is a technical problem to be solved at present.
Disclosure of Invention
The invention provides a control method for reactive power compensation of a wind power plant, which is used for solving the technical problems that in the prior art, various types of reactive power compensation equipment cannot be organically combined, and an electric field cannot normally run due to communication interruption when disturbed. The method is applied to the wind power plant comprising a power grid, power grid dispatching, a wind power plant AVC and various compensation devices, and comprises the following steps:
the wind power plant AVC obtains a control plan of first equipment in a future period of time according to the wind power prediction information and the reactive voltage control target, and sends the control plan to respective local controllers;
and formulating a reactive compensation strategy based on the operation mode of the wind power plant, and carrying out reactive compensation on the wind power plant by the local controller according to the reactive compensation strategy.
In some embodiments of the application, before the wind farm AVC derives a control plan for capacitor banks and on-load tap changers in a future period of time from the wind power prediction information and the reactive voltage control objective, the method further comprises:
the wind power plant AVC and power grid dispatching periodically receive wind power plant power prediction information, the power grid dispatching sets an operation plan in a future period of time according to the wind power plant power prediction information, the reactive capacity and the local load prediction information, the power grid dispatching generates a reactive voltage control target according to the operation plan, and sends the reactive voltage control target to the wind power plant AVC.
In some embodiments of the present application, the method further comprises:
if no fault exists in the running period of the wind power plant, the wind power plant is in an online adjusting mode;
if a fault exists during the operation of the wind farm, the wind farm is in an emergency regulation mode.
In some embodiments of the present application, a reactive compensation strategy is formulated based on a wind farm operation mode, specifically:
when the wind power plant is in an online adjusting mode, reactive compensation is carried out on first-class equipment according to a control plan, second-class equipment obtains a control instruction at intervals of a first preset time according to the running state of the current wind power plant and a reactive voltage control target, and third-class equipment carries out closed-loop control on a power grid scheduling instruction at intervals of a second preset time;
wherein the first preset time is longer than the second preset time.
In some embodiments of the present application, a reactive compensation strategy is formulated based on a wind farm operation mode, specifically:
when the wind power plant is in an emergency regulation mode, the first type of equipment, the second type of equipment and the third type of equipment perform local reactive power control through a local controller, and after the wind power plant is disturbed, the third type of equipment provides reactive power support for a power grid.
Correspondingly, the application also provides a control device for wind power plant no-power compensation, which is applied to a wind power plant comprising a power grid, power grid scheduling, wind power plant AVC and various compensation devices, and comprises the following steps:
the acquisition module is used for acquiring a control plan of first equipment in a future period of time according to the wind power prediction information and the reactive voltage control target by the wind power plant AVC and transmitting the control plan to respective local controllers;
and the compensation module is used for making a reactive compensation strategy based on the operation mode of the wind power plant, and the local controller carries out reactive compensation on the wind power plant according to the reactive compensation strategy.
In some embodiments of the present application, the apparatus further includes a sending module, configured to:
the wind power plant AVC and power grid dispatching periodically receive wind power plant power prediction information, the power grid dispatching sets an operation plan in a future period of time according to the wind power plant power prediction information, the reactive capacity and the local load prediction information, the power grid dispatching generates a reactive voltage control target according to the operation plan, and sends the reactive voltage control target to the wind power plant AVC.
In some embodiments of the present application, the apparatus further includes a determining module, configured to:
if no fault exists in the running period of the wind power plant, the wind power plant is in an online adjusting mode;
if a fault exists during the operation of the wind farm, the wind farm is in an emergency regulation mode.
In some embodiments of the present application, the compensation module is specifically configured to:
when the wind power plant is in an online adjusting mode, reactive compensation is carried out on first-class equipment according to a control plan, second-class equipment obtains a control instruction at intervals of a first preset time according to the running state of the current wind power plant and a reactive voltage control target, and third-class equipment carries out closed-loop control on a power grid scheduling instruction at intervals of a second preset time;
wherein the first preset time is longer than the second preset time.
In some embodiments of the present application, the compensation module is specifically configured to:
when the wind power plant is in an emergency regulation mode, the first type of equipment, the second type of equipment and the third type of equipment perform local reactive power control through a local controller, and after the wind power plant is disturbed, the third type of equipment provides reactive power support for a power grid.
By applying the technical scheme, the method comprises the steps that the wind power plant AVC obtains a control plan of first-class equipment in a future period of time according to wind power prediction information and a reactive voltage control target, and sends the control plan to respective local controllers; and formulating a reactive compensation strategy based on the operation mode of the wind power plant, and carrying out reactive compensation on the wind power plant by the local controller according to the reactive compensation strategy. According to the method and the device, different compensation strategies are formulated according to different modes of the wind power plant, so that comprehensive application of each reactive compensation device is realized. The control robustness and the reliability are obviously enhanced, and the safety of the wind power plant can still be preliminarily ensured under the condition of communication interruption. The reactive compensation equipment of the corresponding point is selectively selected to complete the corresponding function according to different characteristics of different reactive compensation equipment, and the overall effectiveness and integrity are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart illustrating a control method for wind farm no-power compensation according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a control device for wind farm no-power compensation according to an embodiment of the present invention;
fig. 3 shows a schematic diagram of characteristics of each reactive voltage compensation device of a wind farm in another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
The embodiment of the application provides a control method for reactive compensation of a wind power plant, as shown in fig. 1, the method is applied to the wind power plant comprising a power grid, power grid scheduling, wind power plant AVC and various compensation devices, and the method comprises the following steps:
step S101, the wind power plant AVC obtains a control plan of first equipment in a future period of time according to wind power prediction information and a reactive voltage control target, and sends the control plan to respective local controllers;
and S102, a reactive compensation strategy is formulated based on the operation mode of the wind power plant, and the local controller carries out reactive compensation on the wind power plant according to the reactive compensation strategy.
In this embodiment, the first type of device comprises a capacitor bank comprising a capacitor and a reactance, and a load tap changer tap. The first type of device is a discrete adjustment device. The tap of an on-load tap changer (OLTC) transformer cannot generate reactive power, and only the distribution of the reactive power can be changed. The capacitor, the reactor and the OLTC tap belong to discrete adjusting equipment, and are low in cost and large in capacity, so that the method can be used for compensating the large fluctuation of wind power and a power grid.
In some embodiments of the present application, before the wind farm AVC derives a control plan for the capacitor banks and the on-load tap changers for a future period of time based on the wind power prediction information and the reactive voltage control objective, the method further comprises:
the wind power plant AVC and power grid dispatching periodically receive wind power plant power prediction information, the power grid dispatching sets an operation plan in a future period of time according to the wind power plant power prediction information, the reactive capacity and the local load prediction information, the power grid dispatching generates a reactive voltage control target according to the operation plan, and sends the reactive voltage control target to the wind power plant AVC.
In the embodiment, the wind farm power prediction system sends prediction information of the wind farm in a future period of time to the wind farm AVC and the power grid scheduling in a rolling mode, and the power grid scheduling sets an operation plan in the future period of time according to the wind farm power prediction information, the reactive capacity and the local load prediction information. And the power grid dispatching generates a reactive voltage control target according to the operation plan and sends the reactive voltage control target to the wind power plant AVC.
It is understood that the future period of time may be adjusted according to the actual circumstances, and all fall within the scope of the present application.
In some embodiments of the present application, the method further comprises:
if no fault exists in the running period of the wind power plant, the wind power plant is in an online adjusting mode;
if a fault exists during the operation of the wind farm, the wind farm is in an emergency regulation mode.
In this embodiment, whether a fault exists in the wind farm is determined by determining whether operation data during operation of the wind farm is abnormal, where the operation data includes power generation power, wind speed, active power, reactive power, farm power consumption, and operation state of the equipment. And judging whether the parameters are within a preset error range to determine whether the parameters are abnormal or not, so as to judge the mode of the wind power plant.
In some embodiments of the present application, a reactive compensation strategy is formulated based on a wind farm operation mode, specifically:
when the wind power plant is in an online adjusting mode, reactive compensation is carried out on first-class equipment according to a control plan, second-class equipment obtains a control instruction at intervals of a first preset time according to the running state of the current wind power plant and a reactive voltage control target, and third-class equipment carries out closed-loop control on a power grid scheduling instruction at intervals of a second preset time;
wherein the first preset time is longer than the second preset time.
In this embodiment, the second-class device and the third-class device are both reactive compensation devices, the second-class device includes a DFIG, and the third-class device includes an SVC and a STATCOM. Static Var Compensator (SVC), static synchronous compensator (STATCOM). Firstly, reactive compensation is carried out on first-class equipment according to a control plan, second-class equipment obtains a control instruction at intervals of a first preset time according to the running state of the current wind power plant and a reactive voltage control target, and third-class equipment carries out closed-loop control on a power grid scheduling instruction at intervals of a second preset time.
In some embodiments of the present application, a reactive compensation strategy is formulated based on a wind farm operation mode, specifically:
when the wind power plant is in an emergency regulation mode, the first type of equipment, the second type of equipment and the third type of equipment perform local reactive power control through a local controller, and after the wind power plant is disturbed, the third type of equipment provides reactive power support for a power grid.
In the embodiment, in the actual operation process, the disturbance time is very short, and the communication between each reactive compensation device and the AVC of the wind power plant is difficult to complete, so that various reactive compensation devices adopt local reactive control in an emergency mode. And judging whether the wind power plant is disturbed or not through the terminal voltage of the wind turbine generator, and providing reactive power support for the power grid through third equipment after the wind power plant is disturbed.
By applying the technical scheme, the method comprises the steps that the wind power plant AVC obtains a control plan of first-class equipment in a future period of time according to wind power prediction information and a reactive voltage control target, and sends the control plan to respective local controllers; and formulating a reactive compensation strategy based on the operation mode of the wind power plant, and carrying out reactive compensation on the wind power plant by the local controller according to the reactive compensation strategy. According to the method and the device, different compensation strategies are formulated according to different modes of the wind power plant, and comprehensive application of each reactive compensation device is achieved. The control robustness and reliability are obviously enhanced, and the safety of the wind power plant can still be preliminarily ensured under the condition of communication interruption. The reactive compensation equipment of the corresponding point is selectively selected to complete the corresponding function according to different characteristics of different reactive compensation equipment, and the overall effectiveness and integrity are improved.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by hardware, or by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.), and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the method according to the implementation scenarios of the present invention.
In order to further explain the technical idea of the present invention, the technical solution of the present invention is now described with reference to specific application scenarios.
As shown in fig. 3, the common reactive voltage control equipment and characteristics of the wind farm are as follows:
the capacitor bank, the reactor, the Static Var Compensator (SVC), the static synchronous compensator (STATCOM), and the DFIG can adjust the reactive voltage of the wind farm by changing the reactive power. When the voltage safety is threatened, the DFIG can also reduce the active output of the DFIG, increase the reactive power regulation capacity and improve the voltage level of the wind power plant. On-load tap changer (OLTC) transformer taps cannot generate reactive power, but only the distribution of the reactive power can be changed.
The capacitor, the reactor and the OLTC tap belong to discrete adjusting equipment, and are low in cost and large in capacity, so that the method can be used for compensating the large fluctuation of wind power and a power grid. SVC, STATCOM and DFIG belong to continuous regulation equipment, SVC and STATCOM are high in cost and small in capacity, and although DFIG is large in capacity, reactive power output should be reduced as much as possible in order to improve fault ride-through capability, so that SVC, STATCOM and DFIG can be used for compensating small fluctuation, transient state and dynamic processes of wind power and a power grid.
The method comprises the following steps:
and S101, the wind power plant AVC obtains a control plan of a capacitor bank and an on-load tap changer tap of 3-5h in the future according to wind power prediction information and a reactive voltage control target, and sends the control plan to respective local controllers.
S102, when no fault exists in the wind power plant, the wind power plant is in an online regulation mode, firstly, the capacitor bank and the on-load tap transformer are compensated in a large range according to a control plan, the SVC, the STATCOM and the DFIG are controlled on the basis of compensation of the capacitor bank and the on-load tap transformer, meanwhile, the SVC, the STATCOM and the DFIG are controlled, repeated regulation is easily caused, therefore, the control time of the SVC and the STATCOM is separated from the control time of the DFIG, the communication reliability of the DFIG is low, the time delay of the DFIG is large, and the control time of the SVC, the STATCOM and the DFIG is set to be 2S (second preset time) and 8S (first preset time). On the basis of tap compensation of a capacitor bank and an on-load tap changing transformer, the DFIG obtains control instructions of all fan sets every 8s according to the running state of the current wind power plant and a reactive voltage control target, and finally, closed-loop control of a power grid dispatching instruction is achieved every 2s by using SVC and STATCOM. The large-range adjustment is carried out through a capacitor bank and a tap joint of the on-load tap changing transformer, the small-range adjustment is carried out through the DFIG, and finally closed-loop control is carried out through the SVC and the STATCOM.
When the wind power plant has a fault, the wind power plant is in an emergency mode, each reactive compensation device adopts local reactive control to judge whether the voltage at the generator end of the wind power generator is greater than 1.2pu or less than 0.8pu so as to judge whether the voltage is disturbed, the voltage is disturbed if the voltage is greater than 1.2pu or less than 0.8pu, after the voltage is disturbed, the task of the voltage control of the wind power plant is to provide reactive support for a power grid, SVC and STATCOM react quickly, the control can be carried out continuously, the limitation of switching times and time intervals is avoided, the reactive support is provided for the power grid during the fault, and the control target is that the terminal voltage reference value is 1.0 pu.
It is understood that the specific values of the related parameters may be adaptively adjusted according to actual situations, and this is within the scope of the present application.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by hardware, or by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.), and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the method according to the implementation scenarios of the present invention.
Correspondingly, the present application further provides a control device for wind farm no-power compensation, as shown in fig. 2, which is applied to a wind farm including a power grid, a power grid schedule, a wind farm AVC and various compensation devices, and the device includes:
the obtaining module 201 is used for the wind power plant AVC to obtain a control plan of the first type of equipment in a future period of time according to the wind power prediction information and the reactive voltage control target, and to issue the control plan to respective local controllers;
and the compensation module 202 is used for making a reactive compensation strategy based on the operation mode of the wind power plant, and the local controller performs reactive compensation on the wind power plant according to the reactive compensation strategy.
In some embodiments of the present application, the apparatus further includes a sending module, configured to:
the wind power plant AVC and power grid dispatching periodically receive wind power plant power prediction information, the power grid dispatching sets an operation plan in a future period of time according to the wind power plant power prediction information, the reactive capacity and the local load prediction information, the power grid dispatching generates a reactive voltage control target according to the operation plan, and sends the reactive voltage control target to the wind power plant AVC.
In some embodiments of the present application, the apparatus further includes a determining module, configured to:
if no fault exists in the running period of the wind power plant, the wind power plant is in an online adjusting mode;
if a fault exists during the operation of the wind farm, the wind farm is in an emergency regulation mode.
In some embodiments of the present application, the compensation module 202 is specifically configured to:
when the wind power plant is in an online adjusting mode, reactive compensation is carried out on first-class equipment according to a control plan, second-class equipment obtains a control instruction at intervals of a first preset time according to the running state of the current wind power plant and a reactive voltage control target, and third-class equipment carries out closed-loop control on a power grid scheduling instruction at intervals of a second preset time;
wherein the first preset time is longer than the second preset time.
In some embodiments of the present application, the compensation module 202 is specifically configured to:
when the wind power plant is in an emergency regulation mode, the first type of equipment, the second type of equipment and the third type of equipment perform local reactive power control through a local controller, and after the wind power plant is disturbed, the third type of equipment provides reactive power support for a power grid.
Those skilled in the art will appreciate that the modules in the devices in the implementation scenario may be distributed in the devices in the implementation scenario according to the description of the implementation scenario, or may be located in one or more devices different from the present implementation scenario with corresponding changes. The modules of the implementation scenario may be combined into one module, or may be further split into a plurality of sub-modules.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (10)

1. A control method for reactive compensation of a wind power plant is characterized by comprising the following steps:
the wind power plant AVC obtains a control plan of first equipment in a future period of time according to the wind power prediction information and the reactive voltage control target, and sends the control plan to respective local controllers;
and formulating a reactive compensation strategy based on the operation mode of the wind power plant, and carrying out reactive compensation on the wind power plant by the local controller according to the reactive compensation strategy.
2. The method of claim 1, wherein prior to the wind farm AVC deriving a control plan for capacitor banks and on-load tap changers for a future period of time from wind power forecast information and reactive voltage control objectives, the method further comprises:
the wind power plant AVC and power grid dispatching periodically receive wind power plant power prediction information, the power grid dispatching sets an operation plan in a future period of time according to the wind power plant power prediction information, the reactive capacity and the local load prediction information, the power grid dispatching generates a reactive voltage control target according to the operation plan, and sends the reactive voltage control target to the wind power plant AVC.
3. The method of claim 1, wherein the method further comprises:
if no fault exists in the running period of the wind power plant, the wind power plant is in an online adjusting mode;
if a fault exists during the operation of the wind farm, the wind farm is in an emergency regulation mode.
4. The method according to claim 3, characterized in that a reactive compensation strategy is formulated based on the wind farm operation mode, specifically:
when the wind power plant is in an online adjusting mode, reactive compensation is carried out on first-class equipment according to a control plan, second-class equipment obtains a control instruction at intervals of a first preset time according to the running state of the current wind power plant and a reactive voltage control target, and third-class equipment carries out closed-loop control on a power grid scheduling instruction at intervals of a second preset time;
wherein the first preset time is longer than the second preset time.
5. The method according to claim 3, characterized in that a reactive compensation strategy is formulated based on the wind farm operation mode, specifically:
when the wind power plant is in an emergency regulation mode, the first type of equipment, the second type of equipment and the third type of equipment perform local reactive power control through a local controller, and after the wind power plant is disturbed, the third type of equipment provides reactive power support for a power grid.
6. A control device for reactive compensation of a wind power plant is characterized by comprising:
the acquisition module is used for acquiring a control plan of first equipment in a future period of time according to the wind power prediction information and the reactive voltage control target by the wind power plant AVC and transmitting the control plan to respective local controllers;
and the compensation module is used for making a reactive compensation strategy based on the operation mode of the wind power plant, and the local controller carries out reactive compensation on the wind power plant according to the reactive compensation strategy.
7. The apparatus of claim 6, wherein the apparatus further comprises a sending module to:
the wind power plant AVC and power grid dispatching periodically receive wind power plant power prediction information, the power grid dispatching sets an operation plan in a future period of time according to the wind power plant power prediction information, the reactive capacity and the local load prediction information, the power grid dispatching generates a reactive voltage control target according to the operation plan, and sends the reactive voltage control target to the wind power plant AVC.
8. The apparatus of claim 6, wherein the apparatus further comprises a determining module to:
if no fault exists in the running period of the wind power plant, the wind power plant is in an online adjusting mode;
if a fault exists during the operation of the wind farm, the wind farm is in an emergency regulation mode.
9. The apparatus of claim 8, wherein the compensation module is specifically configured to:
when the wind power plant is in an online regulation mode, reactive compensation is carried out on first-class equipment according to a control plan, second-class equipment obtains a control instruction at intervals of first preset time according to the running state of the current wind power plant and a reactive voltage control target, and third-class equipment carries out closed-loop control on a power grid dispatching instruction at intervals of second preset time;
wherein the first preset time is longer than the second preset time.
10. The apparatus of claim 8, wherein the compensation module is specifically configured to:
when the wind power plant is in an emergency regulation mode, the first type of equipment, the second type of equipment and the third type of equipment perform local reactive power control through a local controller, and after the wind power plant is disturbed, the third type of equipment provides reactive power support for a power grid.
CN202210575976.6A 2022-05-24 2022-05-24 Control method and device for reactive compensation of wind power plant Pending CN114977336A (en)

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