CN114006421A - Rapid reactive power control method and system for wind turbine group - Google Patents
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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
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1885—Arrangements for adjusting, eliminating or compensating reactive power in networks using rotating means, e.g. synchronous generators
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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
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
- 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
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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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
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a fast reactive power control method and a fast reactive power control system for a wind turbine group, wherein the control method comprises the following steps: collecting data of a wind turbine generator; storing the wind turbine generator data in a data pool by a safety lock mechanism; acquiring wind turbine generator data from a data pool and mapping the wind turbine generator data into data required by reactive power control so as to generate a reactive power distribution instruction; storing the reactive power distribution instruction in a data pool in a safety lock mechanism; and acquiring a reactive power distribution instruction from the data pool, and mapping the reactive power distribution instruction into a reactive power control instruction of the wind turbine generator so as to control the reactive power state of the wind turbine generator. Generating a reactive power distribution instruction through the data of the wind turbine generator and mapping the data to the data required by reactive power control; and mapping the reactive power distribution instruction into a reactive power control instruction of the wind turbine generator so as to control the reactive power state of the wind turbine generator. The reactive state to the fan can be adjusted fast in time, and no action loss exists. The high coupling method saves the time consumed by the system in the data transmission and data storage processes.
Description
Technical Field
The invention belongs to the field of reactive power control of wind power plants, and particularly relates to a method and a system for fast reactive power control of a wind turbine group.
Background
At present, wind power plant reactive power control methods in the existing market are various, but the existing methods mostly focus on the accuracy and speed of algorithm control from the perspective of a control algorithm, and lack the capability of carrying out division from the overall layout; simultaneously because the quick adjustment ability of SVG system, many control system regard it as reserve adjustment means with it, think that the quality of SVG system adjustment can not arouse too big system deviation, because quick, accurate regulatory function of SVG leads to current system to lack the power that initiatively promotes the optimization, but the regulation of SVG is established and is realized on the basis of consuming wind field self electric quantity, and the action loss of SVG can consume a large amount of electric energy.
Disclosure of Invention
The invention aims to provide a fast reactive power control method and system for a wind turbine group, and aims to solve the problem that in the prior art, the action loss of SVG is large.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect of the present invention, a method for fast reactive power control of a wind turbine farm includes the following steps:
collecting data of a wind turbine generator;
storing the wind turbine generator data in a data pool by a safety lock mechanism;
acquiring wind turbine generator data from the data pool and mapping the wind turbine generator data into data required by reactive power control so as to generate a reactive power distribution instruction;
storing the reactive power distribution instructions in a data pool in a safe lock mechanism;
and acquiring a reactive power distribution instruction from the data pool, and mapping the reactive power distribution instruction into a reactive power control instruction of the wind turbine generator so as to control the reactive power state of the wind turbine generator.
Optionally, the method further comprises the steps of: collecting current and voltage signals of a grid-connected point of a wind turbine generator, and judging whether a reactive actual value of a wind power plant is within a target value error range or not according to the current and voltage signals; and if the reactive power control command is not in the target value error range, the reactive power control command is adjusted until the reactive power actual value of the wind power plant is in the target value error range.
Optionally, the wind turbine data and the reactive power distribution instruction are stored in a data pool by a safety lock mechanism, and the specific method is as follows: the data of the wind turbine generator can only be read and cannot be modified; the reactive power distribution instructions can only be modified and cannot be read by the reactive power control.
Optionally, the channels for acquiring the data of the wind turbine generator and issuing the reactive power distribution instruction to the wind turbine generator are independent from each other.
Optionally, the specific manner of generating the reactive power distribution instruction is as follows:
acquiring a voltage target value of reactive power regulation of the wind turbine generator;
obtaining an error value according to the voltage target value and the actual voltage value of the wind generating set in reactive power regulation;
multiplying the feedforward coefficient by the error value to obtain a calculated error value;
and performing proportional calculation and integral calculation according to the calculation error value to obtain a finally optimized reactive power distribution instruction.
Optionally, after the finally optimized reactive power distribution instruction is obtained, the reactive power distribution instruction is issued to each wind turbine.
Optionally, the feedforward coefficient is obtained as follows:
when the absolute value of the error value err between the voltage target value and the actual voltage value is greater than the boundary value Qb, the feedforward coefficient KerIs set to 1; when the absolute value of the error value err is less than or equal to the boundary value Qb, the feedforward coefficient KerIs set as the ratio of the absolute value of the error value err to the boundary value.
Optionally, after the finally optimized reactive power distribution instruction is obtained, the reactive power distribution instruction is issued to each wind turbine generator in an empowerment distribution mode.
Optionally, the method for assigning right includes:
and taking the sum of the total voltages of all the wind turbines as a reference, taking the actual voltage value of the current wind turbine as a reference, and dividing the actual voltage value of the current wind turbine by the sum of the total voltages of all the wind turbines to serve as a voltage distribution weighted value of the current wind turbine.
In a second aspect of the present invention, a system for a fast reactive power control method for a wind turbine farm includes:
the data transmission module is used for acquiring data of the wind turbine generator; issuing a reactive control instruction to the wind turbine generator set to control the reactive state of the wind turbine generator set;
the safety lock data pool module is used for storing the wind turbine generator data in a data pool through a safety lock mechanism; storing the reactive power distribution instructions in a data pool in a safe lock mechanism;
the memory data mapping module is used for acquiring wind turbine generator data from the data pool, mapping the wind turbine generator data into data required by reactive power control, acquiring a reactive power distribution instruction from the data pool, and mapping the reactive power distribution instruction into a reactive power control instruction of the wind turbine generator;
and the reactive power control algorithm module is used for generating a reactive power distribution instruction.
The invention has the following beneficial effects:
1. according to the fast reactive power control method for the wind turbine generator, the data of the wind turbine generator are mapped into the data required by reactive power control, and a reactive power distribution instruction is generated; and mapping the reactive power distribution instruction to a reactive power control instruction of the wind turbine generator so as to control the reactive power state of the wind turbine generator. The reactive state to the fan can be adjusted fast in time, and no action loss exists. The high coupling method saves the time consumed by the system in the data transmission and data storage processes.
2. According to the fast reactive power control method of the wind turbine generator, the data of the wind turbine generator are stored in the data pool through the safety lock mechanism, and the reactive power distribution instruction is stored in the data pool through the safety lock mechanism; and protecting data to prevent data tampering.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a flow chart of a fast reactive power control method for a wind turbine farm according to an embodiment of the present invention.
Fig. 2 is a diagram of reactive instruction generation according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a fast reactive power control system of a wind turbine farm according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
The invention aims to provide a method and a system for fast reactive power control of a wind turbine group, wherein a data transmission module, a reactive power control algorithm module and a memory data mapping module are highly coupled together in the calculation process of a control algorithm, and the whole process from bottom data acquisition to control algorithm calculation to control instruction issuing is completed in a memory. The method is suitable for the field of reactive power control of the wind power plant, and realizes quick control of the reactive power of the wind turbine generator.
As shown in fig. 1, in a first aspect of the present invention, a method for fast reactive power control of a wind turbine farm is provided, which includes the following steps:
s1, collecting wind turbine generator data;
s2, storing the wind turbine data in a data pool by a safety lock mechanism; the concrete mode is as follows: the data of the wind turbine generator can only be read and cannot be modified; the reactive power distribution instructions can only be modified and cannot be read by the reactive power control.
In order to ensure the efficient interaction of data, a safety lock mechanism is adopted in the data pool for data protection, so that data tampering is prevented; the data pool is divided into two parts of data, one part is a fan information acquisition data unit, and the other part is a fan lower control information data unit; the reactive power control algorithm module can only acquire the data of the elements in the unit, cannot modify the fan information acquisition data unit, and has modification permission but cannot read the data of the fan lower control information data unit.
S3, acquiring wind turbine generator data from the data pool and mapping the wind turbine generator data into data required by reactive power control to generate a reactive power distribution instruction;
the specific way of generating the reactive power distribution instruction is as follows:
acquiring a voltage target value of reactive power regulation of the wind turbine generator; obtaining an error value according to the voltage target value and the actual voltage value of the wind generating set in reactive power regulation; multiplying the feedforward coefficient by the error value to obtain a calculated error value; and performing proportional calculation and integral calculation according to the calculation error value to obtain a finally optimized reactive power distribution instruction. And after the finally optimized reactive power distribution instruction is obtained, the reactive power distribution instruction is issued to each wind turbine generator in an empowerment distribution mode.
The feedforward coefficient is obtained as follows:
under the condition of fully considering the quick response capability of the reactive compensation equipment of the wind power plant, the whole control process is completed by adopting an algorithm model of matching boundary value control with proportional control and integral control.
The feedforward coefficient value is determined mainly by setting a boundary value in the feedforward control, and the feedforward coefficient K is determined when the absolute value of the error value err between the voltage target value and the actual voltage value is larger than the boundary value QberIs set to 1; when the absolute value of the error value err is less than or equal to the boundary value Qb, the feedforward coefficient KerSet as the ratio of the absolute value of the error value err to the boundary value, the formula is as follows:
after the feedforward coefficient is calculated, multiplying the feedforward coefficient by the current error value err1 to obtain a calculated error value err, completing the processes of proportional calculation and integral calculation by using the calculated error value err, and finally outputting a reactive instruction value, wherein Kp and Ki are constant coefficients;
err＝err1*Ker；
and S4, storing the reactive power distribution instruction in a data pool in a safety lock mechanism.
And S5, obtaining a reactive power distribution instruction from the data pool, and mapping the reactive power distribution instruction into a reactive power control instruction of the wind turbine generator so as to control the reactive power state of the wind turbine generator. Collecting current and voltage signals of a grid-connected point of a wind turbine generator, and judging whether a reactive actual value of a wind power plant is within a target value error range or not according to the current and voltage signals; and if the reactive power control command is not in the target value error range, the reactive power control command is adjusted until the reactive power actual value of the wind power plant is in the target value error range.
The method adopts the empowerment distribution when the voltage instruction of each fan is distributed, and the empowerment distribution method comprises the following steps:
the weighting distribution is mainly based on the sum of the total voltage of all fans of the line, the actual voltage value of the current fan is used as a reference, and the sum of the total voltage values of all fans is divided by the actual voltage value of the current fan to obtain a voltage distribution weighted value of the current fan.
When the reactive power distribution is carried out, the current reactive power of the fan is judged according to the data of the wind speed, the active power of the fan, the state of the fan, the reactive power of the fan and the like in consideration of individual conditions, and the actual distribution is carried out according to the reactive power. As an example, for example, when the current wind turbine generator is in an off state, the reactive power of the current wind turbine generator is zero, and reactive power distribution is not performed, and further description of other examples is omitted here. Data such as wind speed, fan active power, fan state, fan reactive power and the like are also acquired from a data pool, and data points in the data pool comprise data such as a fan wind speed point, a fan active power point, a fan reactive power feedback point, a fan state point, a fan reactive power control point, a grid connection point voltage signal point, a grid connection point current signal point and the like.
As an optional embodiment of the invention, channels for acquiring data of the wind turbine generator and issuing a reactive power distribution instruction to the wind turbine generator are independent from each other, so that a mechanism of separate operation is adopted for uploading and downloading the data.
In a second aspect of the present invention, a fast reactive power control system for a wind turbine, includes:
the data transmission module is used for acquiring data of the wind turbine generator; issuing a reactive control instruction to the wind turbine generator set to control the reactive state of the wind turbine generator set; the lower part is mainly responsible for communicating with the wind turbine generator, and the upper part is mainly subjected to data interaction through the safety lock data pool module, the memory data mapping module and the reactive power control algorithm module, so that the functions of collecting and controlling the fan are realized.
The safety lock data pool module is used for storing the wind turbine generator data in a data pool through a safety lock mechanism; storing the reactive power distribution instructions in a data pool in a safe lock mechanism; the data obtained in the data transmission module can be stored in the safety lock data pool module, then a one-to-one mapping relation is directly formed between the input quantity participating in calculation and the input quantity participating in calculation through the memory data mapping module and the reactive power control algorithm module, meanwhile, the calculation result parameters in the reactive power control algorithm module are subjected to data interaction with the safety lock data pool module through the memory data mapping module, and then a one-to-one mapping relation is formed between the calculation result parameters and the issued control point variables in the data transmission module, and through the high coupling, the high-speed real-time performance of the data in the flow processing process is achieved.
The memory data mapping module is used for acquiring wind turbine generator data from the data pool, mapping the wind turbine generator data into data required by reactive power control, acquiring a reactive power distribution instruction from the data pool, and mapping the reactive power distribution instruction into a reactive power control instruction of the wind turbine generator; and establishing a direct mapping relation between the data on the fan side and the reactive power control algorithm module as a medium. The memory mapping module is mainly responsible for completing the establishment of the mapping relation between the data transmission module and the reactive power control algorithm module and the mapping check work so as to ensure the establishment of the mapping relation and the normality of a mapping channel.
And the reactive power control algorithm module is used for generating a reactive power distribution instruction.
The grid-connected point signal acquisition module is mainly used for acquiring current and voltage signals of a grid-connected point of a wind field so as to detect whether the reactive power change condition of the whole field reaches a target value in the adjusting process.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (10)
1. A fast reactive power control method for a wind turbine group is characterized by comprising the following steps:
collecting data of a wind turbine generator;
storing the wind turbine generator data in a data pool by a safety lock mechanism;
acquiring wind turbine generator data from the data pool and mapping the wind turbine generator data into data required by reactive power control so as to generate a reactive power distribution instruction;
storing the reactive power distribution instructions in a data pool in a safe lock mechanism;
and acquiring a reactive power distribution instruction from the data pool, and mapping the reactive power distribution instruction into a reactive power control instruction of the wind turbine generator so as to control the reactive power state of the wind turbine generator.
2. The fast reactive power control method for a wind farm according to claim 1, further comprising the steps of: collecting current and voltage signals of a grid-connected point of a wind turbine generator, and judging whether a reactive actual value of a wind power plant is within a target value error range or not according to the current and voltage signals; and if the reactive power control command is not in the target value error range, the reactive power control command is adjusted until the reactive power actual value of the wind power plant is in the target value error range.
3. The fast reactive power control method for the wind turbine generator according to claim 1, wherein the wind turbine generator data and the reactive power distribution instruction are stored in a data pool by a safety lock mechanism, and the specific manner is as follows: the data of the wind turbine generator can only be read and cannot be modified; the reactive power distribution instructions can only be modified and cannot be read by the reactive power control.
4. The fast reactive power control method for the wind turbine generator according to claim 1, wherein the channels for collecting the data of the wind turbine generator and issuing the reactive power distribution instructions to the wind turbine generator are independent.
5. The fast reactive power control method for the wind turbine generator according to claim 1, wherein the specific manner for generating the reactive power distribution instruction is as follows:
acquiring a voltage target value of reactive power regulation of the wind turbine generator;
obtaining an error value according to the voltage target value and the actual voltage value of the wind generating set in reactive power regulation;
multiplying the feedforward coefficient by the error value to obtain a calculated error value;
and performing proportional calculation and integral calculation according to the calculation error value to obtain a finally optimized reactive power distribution instruction.
6. The fast reactive power control method for the wind turbine generator according to claim 5, wherein the reactive power distribution instruction is issued to each wind turbine generator after the finally optimized reactive power distribution instruction is obtained.
7. The fast reactive power control method for the wind turbine generator according to claim 5, wherein the feedforward coefficient is obtained as follows:
when the absolute value of the error value err between the voltage target value and the actual voltage value is greater than the boundary value Qb, the feedforward coefficient KerIs set to 1; when the absolute value of the error value err is less than or equal to the boundary value Qb, the feedforward coefficient KerIs set as the ratio of the absolute value of the error value err to the boundary value.
8. The fast reactive power control method for the wind turbine generator according to claim 6, wherein the reactive power distribution instruction is issued to each wind turbine generator in an empowerment distribution manner after the finally optimized reactive power distribution instruction is obtained.
9. The fast reactive power control method for the wind turbine generator according to claim 8, wherein the empowerment distribution method is as follows:
and taking the sum of the total voltages of all the wind turbines as a reference, taking the actual voltage value of the current wind turbine as a reference, and dividing the actual voltage value of the current wind turbine by the sum of the total voltages of all the wind turbines to serve as a voltage distribution weighted value of the current wind turbine.
10. A system for the fast reactive power control method of the wind farm according to claim 1, comprising:
the data transmission module is used for acquiring data of the wind turbine generator; issuing a reactive control instruction to the wind turbine generator set to control the reactive state of the wind turbine generator set;
the safety lock data pool module is used for storing the wind turbine generator data in a data pool through a safety lock mechanism; storing the reactive power distribution instructions in a data pool in a safe lock mechanism;
the memory data mapping module is used for acquiring wind turbine generator data from the data pool, mapping the wind turbine generator data into data required by reactive power control, acquiring a reactive power distribution instruction from the data pool, and mapping the reactive power distribution instruction into a reactive power control instruction of the wind turbine generator;
and the reactive power control algorithm module is used for generating a reactive power distribution instruction.
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| CN108879685A (en) * | 2018-08-09 | 2018-11-23 | 安徽亚辉电气自动化有限公司 | A kind of control method of Active Power Filter-APF |
| CN109256783A (en) * | 2018-11-30 | 2019-01-22 | 国网山东省电力公司经济技术研究院 | A kind of voltage control method for coordinating of distributing wind power integration mixing power distribution network |
| CN110350592A (en) * | 2019-06-03 | 2019-10-18 | 南京国电南自电网自动化有限公司 | A kind of fast frequency responding power control system and method |
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