CN112881822B - Detection method and equipment for voltage control function of wind farm - Google Patents
Detection method and equipment for voltage control function of wind farm Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/001—Measuring real or reactive component; Measuring apparent energy
- G01R21/003—Measuring reactive 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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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Abstract
A detection method and equipment for a voltage control function of a wind power plant are characterized in that secondary voltage signals of grid connection points collected by a voltage control system are disconnected and connected to a voltage disturbance generating device, a data recording analyzer simultaneously records grid connection point voltage, grid connection point current and voltage signals generated by the voltage disturbance generating device, the voltage disturbance generating device simulates grid connection point voltage fluctuation of the wind power plant to be outside a voltage control dead zone, the data recording analyzer analyzes reactive power change conditions of the grid connection points, and voltage control response time and control accuracy are calculated by utilizing the reactive power change and voltage change corresponding conditions, so that the reactive voltage control function of the wind power plant is verified, and stable operation of the grid connection point of the wind power plant is ensured; the problem that the wind power plant loses electric quantity, influences economic benefit and damages a wind turbine generator set when the wind power plant voltage control function is detected is solved.
Description
Technical Field
The invention relates to the technical field of circuit devices for grid-connected power supply of a wind farm, in particular to a detection method and detection equipment for a voltage control function of the wind farm.
Background
Along with the development of economy and society, energy production and consumption continue to increase, and new energy sources such as photovoltaics, wind power and the like not only have the characteristics of cleanness, high efficiency and reproducibility, but also have rich reserves. China advocates the efficient utilization of clean energy, carries out energy structure transformation, and realizes clean substitution. When a large-scale wind farm is integrated into a power grid, a series of problems are brought to the dispatching operation of the power grid, particularly the reactive voltage control problem of grid connection points of the wind farm, and the method is one of the most important research hot spots in the domestic wind power field. Overall, the grid-connected performance of a wind farm is closely related to the voltage stability of grid-connected points (Point of Common Coupling, PCC) of the wind farm, whereas the stability of the PCC voltage of the wind farm is determined by reactive voltage control of the wind farm.
In the prior art, according to a wind farm grid-connected standard, in order to ensure the stable operation of a wind farm grid-connected point, the wind farm is required to be configured with a wind farm reactive voltage automatic control (Automatic Voltage Control, AVC) system. The basic workflow of the wind farm AVC system is as follows: the AVC system receives a voltage control target or a reactive power control target issued by the dispatching master station, and adjusts the output of the fan and the reactive power compensation equipment according to the operation working conditions of the fan, the reactive power compensation devices comprising SVC (Static Var Compensator), SVG (Static Var Generator) and MCR (Magnetically Controlled Reactor) and various reactive power adjustment equipment so as to control the bus voltage at the high and low voltage sides of the wind power plant.
Whether the reactive voltage control function of the wind power plant meets the requirement of carrying out test verification or not, and the NB/T10317-2019 (technical requirements and test method of a wind power plant power control system) prescribes a test method of the reactive voltage control function of the wind power plant, wherein the test method comprises a constant voltage mode test method, a constant reactive power mode test method and a constant power factor mode test method.
The constant reactive power mode test and the constant power factor mode test set the wind power plant as corresponding control modes through the AVC system, and for the wind power plant with rated capacity Pn, under two active powers of less than 30% Pn and more than 90% Pn, control targets are regulated, and reactive power control response time and control accuracy are calculated according to collected three-phase voltage and current.
The constant voltage mode test method is as follows: (1) And under the two active powers of below 30% Pn and above 90% Pn, the wind farm grid-connected point voltage is used as a control target, different voltage control target values are set, the voltage control response time and the control precision are calculated according to the collected three-phase voltage and current, and the active power and the reactive power of the wind farm in the voltage adjustment process are recorded. (2) And (3) keeping the current wind farm grid-connected point voltage control target value under the active power of below 30% Pn and above 90% Pn, simulating the grid-connected point voltage fluctuation of the wind farm to be outside a voltage control dead zone, calculating voltage control response time and control precision according to the collected three-phase voltage and current, and recording the active power and reactive power of the wind farm in the voltage adjustment process. The constant voltage mode test method is easy to realize like the constant reactive power mode test and the constant power factor mode test, but when the voltage fluctuation of the grid-connected point of the wind power plant needs to be simulated to be beyond a voltage control dead zone, the voltage fluctuation is usually generated by cutting off the current collecting line so as to verify whether the AVC system can adjust the voltage back to a control target value, and the cutting off of the current collecting line can cause the loss of electric quantity of the wind power plant, affect the economic benefit and damage the wind power generation set on the current collecting line. There is an urgent need for a method and apparatus for detecting a wind farm voltage control function that overcomes the above-mentioned problems.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a method and equipment for detecting the voltage control function of a wind power plant, which are used for simulating the grid-connected point voltage disturbance of the wind power plant without cutting off a current collecting line, so that the voltage fluctuates from an initial state to the outside of a voltage control dead zone, detecting the voltage control response time and the control precision by collecting three-phase voltage and current in the initial state and the disturbance state, verifying the reactive voltage control function of the wind power plant and ensuring the grid-connected point stable operation of the wind power plant.
The invention adopts the following technical scheme.
A detection method of a wind power plant voltage control function inputs a voltage disturbance signal into a wind power plant voltage control system, and controls the voltage disturbance signal to enable grid-connected point voltage of the wind power plant to fluctuate from an initial state to the outside of a voltage control dead zone; and acquiring three-phase voltage in the initial state of the grid-connected point of the wind power plant and three-phase voltage in the voltage disturbance state, and detecting the index of the voltage control function of the wind power plant based on the fact that the short-time short-circuit capacity of the grid-connected point of the wind power plant is constant.
The detection method comprises the following steps:
step 1, short-time short-circuit capacity of a grid-connected point of a wind power plant is obtained in advance;
step 2, inputting a voltage disturbance signal into a wind power plant voltage control system; controlling a voltage disturbance signal to enable the grid-connected point voltage of the wind power plant to fluctuate from an initial state to be out of a voltage control dead zone; collecting three-phase voltage and three-phase current in an initial state of a grid-connected point of a wind power plant, and collecting three-phase voltage and three-phase current in a voltage disturbance state;
step 3, calculating reactive power corresponding to the disturbance voltage by using the voltage acquired in the step 2 and the calculated reactive power according to the fact that the short-time short-circuit capacity of the grid-connected point of the wind power plant is constant;
and 4, detecting indexes of the voltage control function of the wind power plant according to the change data of reactive power in the process that the voltage of the grid-connected point of the wind power plant fluctuates from an initial state to the outside of a voltage control dead zone, namely calculating the voltage control response time and the voltage control precision.
Preferably, the method comprises the steps of,
the step 1 comprises the following steps:
step 1.1, collecting three-phase voltage and three-phase current of a grid-connected point of a wind power plant;
step 1.2, setting different voltage control target values for a wind power plant voltage control system, and calculating reactive power corresponding to the different voltage control target values by utilizing the collected voltage and current;
step 1.3, calculating short-time short-circuit capacity of the grid-connected point of the wind power plant according to the following relation:
in the method, in the process of the invention,
U 1 、U 2 respectively representing a first voltage control target value and a second voltage control target value set by a wind farm voltage control system;
U n representing the grid-connected point rated voltage of the wind power plant;
Q 1 、Q 2 the first reactive power and the second reactive power corresponding to the first voltage control target value and the second voltage control target value are respectively represented.
Preferably, the method comprises the steps of,
in the step 1.1, a voltage transformer and a current transformer are arranged at a grid-connected point of a wind farm; the voltage transformer collects three-phase voltage of a grid-connected point of the wind power plant and inputs the three-phase voltage to a wind power plant voltage control system and a data recording analyzer; the current transformer collects three-phase current of a grid-connected point of the wind power plant and inputs the three-phase current to a voltage control system and a data recording analyzer of the wind power plant;
in step 1.2, under different voltage control target values, recording three-phase voltage and three-phase current of the electric field grid-connected point by using a data recording analyzer, and calculating corresponding reactive power.
Preferably, the method comprises the steps of,
in step 2, the voltage disturbance signal is generated by a voltage disturbance signal generating device; the voltage disturbance signal is input to the wind power plant voltage control system and is also input to the data record analyzer.
Preferably, the method comprises the steps of,
in the step 2, a voltage transformer and a current transformer are arranged at the grid-connected point of the wind power plant; the voltage transformer collects three-phase voltages of the grid-connected point of the wind power plant and inputs the three-phase voltages to the data recording analyzer; the current transformer collects three-phase current of a grid-connected point of the wind power plant and inputs the three-phase current to a voltage control system and a data recording analyzer of the wind power plant; the voltage disturbance signal generating device inputs a voltage disturbance signal to the wind power plant voltage control system and the data recording analyzer;
and recording three-phase voltage and three-phase current in the initial state of the grid-connected point of the wind power plant and three-phase voltage and three-phase current in the voltage disturbance state by using a data recording analyzer, and calculating reactive power in the initial state.
Preferably, the method comprises the steps of,
in step 4, the voltage control response time is the time required for the reactive power to change from the initial value to the target value; the voltage control accuracy is the error between the average value after the reactive power is changed from the initial value to the target value and the target value after the steady state is entered.
The equipment of the detection method for the voltage control function of the wind power plant comprises a wind power plant voltage control system, a voltage transformer and a current transformer, wherein the voltage transformer and the current transformer are arranged at the grid-connected point of the wind power plant; the system also comprises a data record analyzer and a voltage disturbance generating device; the voltage input end of the data recording analyzer is connected with the secondary side of the voltage transformer, and the current input end of the data recording analyzer is connected with the secondary side of the current transformer.
Preferably, the method comprises the steps of,
the device comprises two modes of operation:
(1) The wind power plant grid-connected point voltage fluctuation and reactive power corresponding relation detection mode is that at the moment, a voltage input end of a wind power plant voltage control system is connected with a secondary side of a voltage transformer, and a current input end of the wind power plant voltage control system is connected with the secondary side of the current transformer;
(2) In the wind power plant voltage control function detection mode, at the moment, a voltage input end of a wind power plant voltage control system is connected with a voltage output end of a voltage disturbance generating device, and a current input end of the wind power plant voltage control system is connected with a secondary side of a current transformer; and the voltage output end of the voltage disturbance generating device is connected with the voltage input end of the data recording analyzer.
Preferably, the method comprises the steps of,
the precision of the voltage transformer and the current transformer is not lower than 0.2 level;
the sampling frequency of the data recording analyzer is not lower than 20kHz, and the bandwidth is not lower than 2.5kHz.
The voltage disturbance generating device is three-phase four-wire output, the voltage output range is larger than 0-135V, the output voltage error is not more than +/-0.1%, the phase output range is 0-360 degrees, the phase output error is not more than +/-0.1 degrees, the signal generating period is not more than 100ms, and the voltage curve editing function is achieved.
The invention has the beneficial effects that compared with the prior art:
1. according to the detection method disclosed by the invention, the voltage fluctuation of the grid-connected point of the wind power plant is simulated through the voltage disturbance generating device and is beyond the voltage control dead zone, the reactive power change condition of the grid-connected point is analyzed through the data recording analyzer, and the voltage control response time and control precision of the wind power plant can be detected by utilizing the condition that the reactive power change corresponds to the voltage change. The detection operation is simple, and the detection result is accurate and reliable.
2. According to the detection method disclosed by the invention, the electric quantity of the wind power plant is not lost when the voltage control function of the wind power plant is detected, so that the economic benefit is improved, and the damage to the wind turbine generator is effectively avoided.
Drawings
FIG. 1 is a flow chart of a method for detecting a wind farm voltage control function according to the present invention;
FIG. 2 is a schematic diagram of the wiring of a normal operation of a wind farm in accordance with a preferred embodiment of the present invention;
FIG. 3 is a schematic diagram of a detection device for a voltage control function of a wind farm in a mode of detecting a correspondence between voltage fluctuation and reactive power of a grid-connected point of the wind farm;
FIG. 4 is a schematic diagram of a detection device for a voltage control function of a wind farm according to the present invention, in a mode of detecting the voltage control function of the wind farm;
FIG. 5 is a graph of a data record and analysis meter in a mode of detecting the corresponding relation between voltage fluctuation and reactive power of a grid-connected point of a wind farm;
FIG. 6 is a graph of the wave recording of a data recording analyzer in a wind farm voltage control function detection mode;
FIG. 7 is a graph of the wave recording curve of the data recording analyzer for voltage control response time and control accuracy of the detection device for the voltage control function of the wind farm.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present invention and are not intended to limit the scope of protection of the present application.
The invention discloses a detection method of a wind power plant voltage control function, which comprises the steps of inputting a voltage disturbance signal into a wind power plant voltage control system, and controlling the voltage disturbance signal to enable the grid-connected point voltage of the wind power plant to fluctuate from an initial state to be outside a voltage control dead zone; and acquiring three-phase voltage in the initial state of the grid-connected point of the wind power plant and three-phase voltage in the voltage disturbance state, and detecting the index of the voltage control function of the wind power plant based on the fact that the short-time short-circuit capacity of the grid-connected point of the wind power plant is constant.
Referring to fig. 1, a method for detecting a voltage control function of a wind farm includes the following steps:
and step 1, short-time short-circuit capacity of the grid-connected point of the wind power plant is obtained in advance.
In particular, the method comprises the steps of,
the step 1 comprises the following steps:
step 1.1, collecting three-phase voltage and three-phase current of a grid-connected point of a wind power plant;
step 1.2, setting different voltage control target values for an AVC system of a wind power plant, and calculating reactive power corresponding to the different voltage control target values by utilizing the collected voltage and current;
step 1.3, calculating short-time short-circuit capacity of the grid-connected point of the wind power plant according to the following relation:
in the method, in the process of the invention,
U 1 、U 2 respectively representing a first voltage control target value and a second voltage control target value set by a wind farm voltage control system;
U n representing the grid-connected point rated voltage of the wind power plant;
Q 1 、Q 2 the first reactive power and the second reactive power corresponding to the first voltage control target value and the second voltage control target value are respectively represented.
In step 1.1, in a normal operation state, as shown in fig. 2, a voltage transformer PT and a current transformer CT are arranged at the grid-connected point of the wind power plant; the voltage transformer collects three-phase voltage of the grid-connected point of the wind power plant and inputs the three-phase voltage to an AVC system and a data recording analyzer of the wind power plant; the current transformer collects three-phase current of the grid-connected point of the wind power plant and inputs the three-phase current to the wind power plant voltage control system and the data recording analyzer.
In step 1.2, under different voltage control target values, recording three-phase voltage and three-phase current of the electric field grid-connected point by using a data recording analyzer, and calculating corresponding reactive power.
Step 1.2, detecting the corresponding relation between voltage fluctuation and reactive power, and in the detection mode, as shown in fig. 3, acquiring three-phase voltage of a grid-connected point of a wind power plant by a voltage transformer PT, and inputting the three-phase voltage into an AVC system and a data record analyzer of the wind power plant; the current transformer CT collects three-phase current of the grid-connected point of the wind power plant and inputs the three-phase current to an AVC system and a data recording analyzer of the wind power plant.
In the preferred embodiment, the first voltage control target value set by the wind farm AVC system is 231.50kV, and the second voltage control target value is 230.50kV, as shown in the lower curve in FIG. 5; at time 60s, when the voltage control target value changes, the reactive power decreases as shown by the upper graph in fig. 5; the data recording analyzer calculates reactive power from 1.2MVar to-18.5 MVar according to the input three-phase voltage and current.
It is worth noting that the person skilled in the art can adopt different types of equipment according to the actual application situation, so as to realize the recording, calculation and waveform display of voltage, current and reactive power. The preferred embodiment of the present invention uses a data logging analyzer to achieve voltage, current and reactive power logging, calculation and waveform display, as a non-limiting preferred option.
In step 1.3, according to the fact that the short-circuit capacity of a certain point of the power system is a fixed value in a certain short time, in the preferred embodiment, the short-time short-circuit capacity of the grid-connected point of the wind power plant is 4344MVA through calculation.
Step 2, inputting a voltage disturbance signal into an AVC system of a wind power plant; controlling a voltage disturbance signal to enable the grid-connected point voltage of the wind power plant to fluctuate from an initial state to be out of a voltage control dead zone; and collecting three-phase voltage and three-phase current in the initial state of the grid-connected point of the wind power plant, and collecting three-phase voltage and three-phase current in the voltage disturbance state.
In particular, the method comprises the steps of,
as shown in fig. 4, in step 2, a voltage disturbance signal is generated by a voltage disturbance signal generating device; the voltage disturbance signal is input to the AVC system of the wind power plant and is also input to the data record analyzer.
A voltage transformer PT and a current transformer CT are arranged at the grid-connected point of the wind power plant; the voltage transformer PT collects three-phase voltages of the grid-connected point of the wind power plant and inputs the three-phase voltages to the data recording analyzer; the current transformer CT collects three-phase current of grid-connected points of the wind power plant and inputs the three-phase current to an AVC system and a data recording analyzer of the wind power plant; the voltage disturbance signal generating device inputs the voltage disturbance signal to the wind power plant AVC system and the data record analyzer.
In the prior art, a current collecting line is cut off to enable the grid-connected point voltage of the wind power plant to fluctuate beyond a voltage control dead zone so as to verify whether the AVC system can regulate the voltage back to a control target value. In the invention, under the test mode of the voltage control function of the wind power plant, the AVC system of the wind power plant does not collect secondary voltage signals of grid connection points, and the voltage disturbance signal generating device completely provides voltage signals at the moment, so that the running process of voltage fluctuation of grid connection points of the wind power plant outside a voltage control dead zone can be simulated under the condition that a current collecting line is not cut off. Therefore, the problems that the wind power plant loses electric quantity, influences economic benefit and damages a wind turbine generator set when the wind power plant voltage control function is detected are effectively solved.
It is worth noting that a person skilled in the art may take different types of devices to achieve voltage fluctuations depending on the actual application needs. The preferred embodiment of the present invention uses a voltage disturbance signal generating device to achieve voltage fluctuations, which is a non-limiting preferred option.
And recording three-phase voltage and three-phase current in the initial state of the grid-connected point of the wind power plant and three-phase voltage and three-phase current in the voltage disturbance state by using a data recording analyzer, and calculating reactive power in the initial state.
In the preferred embodiment, as shown in fig. 6, the voltage fluctuation of the grid-connected point of the wind power plant is simulated by the voltage disturbance generating device to be outside a voltage control dead zone, and the voltage of the grid-connected point is fluctuated from 228.50kV to 229.60kV, as shown in the lower curve in fig. 6; and the data recording analyzer calculates and analyzes the change condition of reactive power of the grid-connected point according to the input three-phase voltage and current, and obtains the initial value of the reactive power corresponding to the voltage of the grid-connected point of 228.50kV as minus 41MVar through calculation.
And 3, calculating reactive power corresponding to the disturbance voltage by utilizing the voltage acquired in the step 2 and the calculated reactive power according to the fact that the short-time short-circuit capacity of the grid-connected point of the wind power plant is constant.
In particular, the method comprises the steps of,
and calculating reactive power corresponding to the disturbance voltage outside the control dead zone according to the following relation:
in the method, in the process of the invention,
U 1 、U 2 respectively representing a first voltage control target value and a second voltage control target value set by the wind power plant AVC system;
U、U 0 respectively representing the disturbance voltage and the initial voltage;
Q 1 、Q 2 respectively representing a first voltage control target value and a second electricA first reactive power and a second reactive power corresponding to the voltage control target value;
Q、Q 0 the reactive power corresponding to the disturbance voltage and the initial voltage are respectively represented.
In the preferred embodiment, according to the fact that the short-time short-circuit capacity of the grid-connected point of the wind power plant is a fixed value, the calculated voltage is changed from 228.50kV to 229.60kV, and the reactive power corresponding to the disturbance voltage of 229.60kV is-19.33 MVar.
And 4, detecting indexes of the voltage control function of the wind power plant according to the change data of reactive power in the process that the voltage of the grid-connected point of the wind power plant fluctuates from an initial state to the outside of a voltage control dead zone, namely calculating the voltage control response time and the voltage control precision.
In particular, the method comprises the steps of,
in the step 4 of the process, the process is carried out,
the voltage control response time is the time required for the reactive power to change from an initial value to a target value;
in the preferred embodiment, as shown in FIG. 7, the time required for the reactive power to change from-41 MVar to-19.33 Mvar is 1.18s, i.e., the voltage control response time is 1.18s.
In particular, the method comprises the steps of,
the voltage control precision is the error between the average value and the target value after the reactive power is changed from the initial value to the target value and enters a steady state;
in the preferred embodiment, as shown in fig. 7, the initial value of the reactive power is-41 MVar, which gradually enters a steady state after changing to-19.33 MVar, and the error between the average value and the target value is 4.24%, that is, the voltage control accuracy is 4.24%.
As shown in fig. 3 and 4, a detection device for a voltage control function of a wind farm comprises a wind farm AVC system, a voltage transformer PT and a current transformer CT which are arranged at a grid-connected point of the wind farm;
the detection equipment also comprises a data record analyzer and a voltage disturbance generating device; the voltage input end of the data recording analyzer is connected with the secondary side of the voltage transformer PT, and the current input end is connected with the secondary side of the current transformer CT.
In particular, the method comprises the steps of,
the detection device comprises two modes of operation:
(1) In the detection mode of the corresponding relation between the grid-connected point voltage fluctuation and the reactive power of the wind power plant, as shown in fig. 3, the voltage input end of the AVC system of the wind power plant is connected with the secondary side of the voltage transformer PT, and the current input end is connected with the secondary side of the current transformer CT;
in the detection equipment with the wind power plant voltage control function in the running mode, the voltage data and the reactive power data recorded, calculated, analyzed and displayed by the data recording analyzer are all data of the wind power plant AVC system, so that the detection of the corresponding relation between the voltage fluctuation and the reactive power of the grid-connected point of the wind power plant in the normal running state is realized, the detection operation is convenient, the device is simple, and the detection accuracy is high.
(2) In the wind farm voltage control function detection mode, as shown in fig. 4, a voltage input end of a wind farm voltage control system is connected with a voltage output end of a voltage disturbance generating device, and a current input end of the wind farm voltage control system is connected with a secondary side of a current transformer CT; and the voltage output end of the voltage disturbance generating device is connected with the voltage input end of the data recording analyzer.
In the operation mode, in the detection equipment with the wind power plant voltage control function, the data recording analyzer records, calculates, analyzes and displays voltage data, reactive power data or various data of the wind power plant AVC system, and can directly record and analyze disturbance voltage; therefore, whether the voltage can be regulated back to the control target value by the wind farm AVC system is verified, and related data during voltage disturbance can be effectively recorded and analyzed, so that the voltage control response time and the voltage control precision of the wind farm AVC system are calculated by utilizing the condition that reactive power change in a disturbance state corresponds to the voltage change, and effective data support is provided for the operation of a control system and the design of the control system; meanwhile, in the mode, the operation of detecting the voltage control function of the wind power plant is convenient, the device is simple, and the detection accuracy is high.
In particular, the method comprises the steps of,
the precision of the voltage transformer and the current transformer is not lower than 0.2 level.
The sampling frequency of the data recording analyzer is not lower than 20kHz, and the bandwidth is not lower than 2.5kHz.
The voltage disturbance generating device is three-phase four-wire output, the voltage output range is larger than 0-135V, the output voltage error is not more than +/-0.1%, the phase output range is 0-360 degrees, the phase output error is not more than +/-0.1 degrees, the signal generating period is not more than 100ms, and the voltage curve editing function is achieved.
It should be noted that, those skilled in the art may select parameters of the voltage transformer, the current transformer, the data recording analyzer and the voltage disturbance generating device according to practical engineering application requirements, and the parameter selection in the effective embodiment of the present invention is a non-limiting preferred choice.
The invention has the beneficial effects that compared with the prior art:
1. according to the detection method disclosed by the invention, the voltage fluctuation of the grid-connected point of the wind power plant is simulated through the voltage disturbance generating device and is beyond the voltage control dead zone, the reactive power change condition of the grid-connected point is analyzed through the data recording analyzer, and the voltage control response time and control precision of the wind power plant can be detected by utilizing the condition that the reactive power change corresponds to the voltage change. The detection operation is simple, and the detection result is accurate and reliable.
2. According to the detection method disclosed by the invention, the electric quantity of the wind power plant is not lost when the voltage control function of the wind power plant is detected, so that the economic benefit is improved, and the damage to the wind turbine generator is effectively avoided.
While the applicant has described and illustrated the embodiments of the present invention in detail with reference to the drawings, it should be understood by those skilled in the art that the above embodiments are only preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not to limit the scope of the present invention, but any improvements or modifications based on the spirit of the present invention should fall within the scope of the present invention.
Claims (8)
1. A method for detecting the voltage control function of a wind power plant is characterized in that,
the detection method comprises the steps of inputting a voltage disturbance signal into a wind power plant voltage control system, and controlling the voltage disturbance signal to enable the grid-connected point voltage of the wind power plant to fluctuate from an initial state to be out of a voltage control dead zone; taking the grid-connected point voltage of the wind power plant as a control target, and calculating to obtain voltage control response time and voltage control precision based on a reactive power initial value in an initial state and a reactive power target value in a voltage disturbance state, wherein the short-time short-circuit capacity of the grid-connected point of the wind power plant is constant; the time required by the reactive power to change from the initial value to the target value is taken as the voltage control response time, and the error between the average value and the target value after the reactive power changes from the initial value to the target value and enters a steady state is taken as the voltage control precision;
the detection method comprises the following steps:
step 1, short-time short-circuit capacity of a grid-connected point of a wind power plant is obtained in advance;
step 2, inputting a voltage disturbance signal into a wind power plant voltage control system; controlling a voltage disturbance signal to enable the grid-connected point voltage of the wind power plant to fluctuate from an initial state to be out of a voltage control dead zone; collecting three-phase voltage and three-phase current of a grid-connected point of a wind power plant in an initial state and three-phase voltage and three-phase current of the grid-connected point of the wind power plant in a voltage disturbance state;
step 3, utilizing the voltage collected in the step 2 and the calculated reactive power; calculating a reactive power target value in a voltage disturbance state by utilizing the grid-connected point voltage in an initial state and a reactive power initial value in the initial state according to the fact that the short-time short-circuit capacity of the grid-connected point of the wind power plant is constant;
and 4, detecting indexes of the voltage control function of the wind power plant according to the change data of reactive power in the process that the voltage of the grid-connected point of the wind power plant fluctuates from an initial state to the outside of a voltage control dead zone, namely calculating the voltage control response time and the voltage control precision.
2. A method for detecting a voltage control function of a wind farm according to claim 1, wherein,
the step 1 comprises the following steps:
step 1.1, collecting three-phase voltage and three-phase current of a grid-connected point of a wind power plant;
step 1.2, setting different voltage control target values for a wind power plant voltage control system, and calculating reactive power corresponding to the different voltage control target values by utilizing the collected voltage and current;
step 1.3, calculating short-time short-circuit capacity of the grid-connected point of the wind power plant according to the following relation:
in the method, in the process of the invention,
U 1 、U 2 respectively representing a first voltage control target value and a second voltage control target value set by a wind farm voltage control system;
U n representing the grid-connected point rated voltage of the wind power plant;
Q 1 、Q 2 the first reactive power and the second reactive power corresponding to the first voltage control target value and the second voltage control target value are respectively represented.
3. A method for detecting a voltage control function of a wind farm according to claim 2, wherein,
in the step 1.1, a voltage transformer and a current transformer are arranged at a grid-connected point of a wind farm; the voltage transformer collects three-phase voltage of a grid-connected point of the wind power plant and inputs the three-phase voltage to a wind power plant voltage control system and a data recording analyzer; the current transformer collects three-phase current of a grid-connected point of the wind power plant and inputs the three-phase current to a voltage control system and a data recording analyzer of the wind power plant;
in step 1.2, under different voltage control target values, recording three-phase voltage and three-phase current of the electric field grid-connected point by using a data recording analyzer, and calculating corresponding reactive power.
4. A method for detecting a voltage control function of a wind farm according to claim 1, wherein,
in step 2, the voltage disturbance signal is generated by a voltage disturbance signal generating device; the voltage disturbance signal is input to the wind power plant voltage control system and is also input to the data record analyzer.
5. A method for detecting a voltage control function of a wind farm according to claim 1, wherein,
in the step 2, a voltage transformer and a current transformer are arranged at the grid-connected point of the wind power plant; the voltage transformer collects three-phase voltages of the grid-connected point of the wind power plant and inputs the three-phase voltages to the data recording analyzer; the current transformer collects three-phase current of a grid-connected point of the wind power plant and inputs the three-phase current to a voltage control system and a data recording analyzer of the wind power plant; the voltage disturbance signal generating device inputs a voltage disturbance signal to the wind power plant voltage control system and the data recording analyzer;
and recording three-phase voltage and three-phase current in the initial state of the grid-connected point of the wind power plant and three-phase voltage and three-phase current in the voltage disturbance state by using a data recording analyzer, and calculating reactive power in the initial state.
6. An apparatus for detecting a voltage control function of a wind farm according to any of claims 1 to 5, comprising a wind farm voltage control system, a voltage transformer and a current transformer arranged in a grid-connected point of the wind farm,
the device also comprises a data record analyzer and a voltage disturbance generating device; the voltage input end of the data recording analyzer is connected with the secondary side of the voltage transformer, and the current input end of the data recording analyzer is connected with the secondary side of the current transformer.
7. The apparatus for a method of detecting a wind farm voltage control function according to claim 6, wherein,
the device comprises two modes of operation:
(1) The wind power plant grid-connected point voltage fluctuation and reactive power corresponding relation detection mode is that at the moment, a voltage input end of a wind power plant voltage control system is connected with a secondary side of a voltage transformer, and a current input end of the wind power plant voltage control system is connected with the secondary side of the current transformer;
(2) In the wind power plant voltage control function detection mode, at the moment, a voltage input end of a wind power plant voltage control system is connected with a voltage output end of the voltage disturbance generating device, and a current input end of the wind power plant voltage control system is connected with a secondary side of the current transformer; and the voltage output end of the voltage disturbance generating device is connected with the voltage input end of the data recording analyzer.
8. The apparatus for a method of detecting a wind farm voltage control function according to claim 6, wherein,
the precision of the voltage transformer and the current transformer is not lower than 0.2 level;
the sampling frequency of the data recording analyzer is not lower than 20kHz, and the bandwidth is not lower than 2.5kHz;
the voltage disturbance generating device is three-phase four-wire output, the voltage output range is 0 to 135V, the output voltage error is not more than +/-0.1%, the phase output range is 0-360 degrees, the phase output error is not more than +/-0.1 degrees, the signal generating period is not more than 100ms, and the voltage curve editing function is achieved.
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