CN112881822A - Method and device for detecting voltage control function of wind power plant - Google Patents
Method and device for detecting voltage control function of wind power plant Download PDFInfo
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- G01—MEASURING; TESTING
- 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
- H02J3/381—Dispersed 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
- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
A method and equipment for detecting voltage control function of a wind power plant are disclosed, wherein a secondary voltage signal of a grid-connected point collected by a voltage control system is disconnected and connected to a voltage disturbance generating device, a data recording analyzer simultaneously records voltage of the grid-connected point, current of the grid-connected point and a voltage signal generated by the voltage disturbance generating device, voltage fluctuation of the grid-connected point of the wind power plant is simulated to be out of a voltage control dead zone through the voltage disturbance generating device, reactive change condition of the grid-connected point is analyzed through the data recording analyzer, voltage control response time and control precision are calculated by utilizing the condition that reactive power change corresponds to voltage change, the reactive voltage control function of the wind power plant is verified, and stable operation of the grid; the problem of develop wind-powered electricity generation field voltage control function and detect and can cause wind-powered electricity generation field loss electric quantity, influence economic benefits, damage wind turbine generator system is solved.
Description
Technical Field
The invention relates to the technical field of circuit devices for grid-connected power supply of a wind power plant, in particular to a method and equipment for detecting a voltage control function of the wind power plant.
Background
With the development of economic society and the continuous increase of energy production and consumption, new energy sources such as photovoltaic energy, wind power and the like not only have the characteristics of cleanness, high efficiency and reproducibility, but also have rich reserves. China advocates high-efficiency utilization of clean energy, carries out energy structure transformation and realizes clean substitution. After a large-scale wind power plant is merged 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 a wind power plant grid-connected point, and the method is one of the most important research hotspots in the domestic wind power field. On the whole, the grid-connected performance of the wind farm is closely related to the voltage stability of a Point of Common Coupling (PCC) of the wind farm, and the stability of the PCC voltage of the wind farm is determined by the reactive voltage control of the wind farm.
In the prior art, according to a wind farm grid-connected standard, in order to ensure that a grid-connected point of a wind farm operates stably, the wind farm is required to be provided with an Automatic Voltage Control (AVC) system of the wind farm. The basic working flow of the wind power plant AVC system is as follows: the AVC system receives a voltage control target or a reactive control target issued by a dispatching master station, and adjusts the output of the fan and the reactive compensation equipment according to the operation conditions of the fan, the reactive compensation device comprising SVC (static Var compensator), SVG (static Var generator), MCR (magnetic Controlled reactor) and various reactive adjustment equipment to realize the control of the voltage of the high-voltage side bus and the low-voltage side bus of the wind power plant.
Whether the reactive voltage control function of the wind power plant meets the requirement of test verification is carried out, NB/T10317 and 2019 technical requirements and test methods of a power control system of the wind power plant stipulate test methods of the reactive voltage control function of the wind power plant, including 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 a wind power plant as a corresponding control mode through an AVC system, and for the wind power plant with rated capacity of Pn, the control target is adjusted under two active powers of less than 30% Pn and more than 90% Pn, and the reactive power control response time and the control precision are calculated according to the collected three-phase voltage and current.
The constant voltage mode test method is as follows: (1) the wind power plant is under two active powers of below 30% Pn and above 90% Pn, the voltage of a grid connection point of the wind power plant is taken 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 power plant in the voltage adjusting process are recorded. (2) The method comprises the steps that a wind power plant keeps a current wind power plant grid-connected point voltage control target value under two active powers of below 30% Pn and above 90% Pn, voltage fluctuation of a wind power plant grid-connected point is simulated to be out of a voltage control dead zone, voltage control response time and control precision are calculated according to collected three-phase voltage and current, and active power and reactive power of the wind power plant in a voltage adjusting process are recorded. The constant voltage mode testing method is easy to realize as the constant reactive power mode testing and the constant power factor mode testing, but when the voltage fluctuation of a grid-connected point of a wind power plant needs to be simulated to be out of a voltage control dead zone, the voltage fluctuation is generated by cutting a current collecting circuit in general so as to verify whether the AVC system can adjust the voltage back to a control target value, the cut current collecting circuit can cause the loss of electric quantity of the wind power plant, the economic benefit is influenced, and a wind turbine generator on the current collecting circuit can be damaged. There is an urgent need for a method and apparatus for detecting wind farm voltage control functions 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 voltage disturbance of a grid-connected point of the wind power plant without cutting off a current collecting circuit 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 control precision by collecting three-phase voltage and current in the initial state and a disturbance state, verifying the reactive voltage control function of the wind power plant and ensuring the stable operation of the grid-connected point of the wind power plant.
The invention adopts the following technical scheme.
A detection method of a voltage control function of a wind power plant inputs a voltage disturbance signal into a voltage control system of the wind power plant to control the voltage disturbance signal, so that the voltage of a grid-connected point of the wind power plant fluctuates from an initial state to a position outside a voltage control dead zone; the method comprises the steps of collecting three-phase voltage of a wind power plant grid-connected point in an initial state and three-phase voltage of a voltage disturbance state, and detecting indexes of a voltage control function of the wind power plant based on the constant short-time short circuit capacity of the wind power plant grid-connected point.
The detection method comprises the following steps:
step 1, acquiring short-time short circuit capacity of a wind power plant grid-connected point in advance;
step 2, inputting the voltage disturbance signal into a voltage control system of the wind power plant; controlling a voltage disturbance signal to enable the voltage of a grid-connected point 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 wind power plant grid-connected point in an initial state and three-phase voltage and three-phase current of a voltage disturbance state;
step 3, calculating reactive power corresponding to the disturbance voltage by using the voltage collected in the step 2 and the reactive power obtained by calculation according to the constant short-circuit capacity of the wind power plant grid-connected point;
and 4, detecting indexes of the voltage control function of the wind power plant according to the change data of the reactive power in the process that the voltage of the grid-connected point of the wind power plant fluctuates from the initial state to the outside of the voltage control dead zone, namely calculating the voltage control response time and the voltage control precision.
Preferably, the first and second electrodes are formed of a metal,
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 using the collected voltage and current;
step 1.3, calculating the short-time short circuit capacity of the wind power plant grid-connected point according to the following relational expression:
in the formula (I), the compound is shown in the specification,
U1、U2respectively representing a first voltage control target value and a second voltage control target value set by a wind power plant voltage control system;
Unrepresenting the rated voltage of a grid-connected point of a wind power plant;
Q1、Q2and respectively representing the first reactive power and the second reactive power corresponding to the first voltage control target value and the second voltage control target value.
Preferably, the first and second electrodes are formed of a metal,
in the step 1.1, a voltage transformer and a current transformer are arranged at a grid connection point of the wind power plant; the voltage transformer collects the 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;
and step 1.2, under different voltage control target values, recording three-phase voltage and three-phase current of the grid-connected point of the electric field by using a data recording analyzer, and calculating corresponding reactive power.
Preferably, the first and second electrodes are formed of a metal,
in step 2, the voltage disturbance signal is generated by a voltage disturbance signal generating device; the voltage disturbance signal is input into the wind power plant voltage control system and also input into the data recording analyzer.
Preferably, the first and second electrodes are formed of a metal,
in the step 2, a voltage transformer and a current transformer are arranged at a grid connection point of the wind power plant; the voltage transformer collects the three-phase voltage of a grid-connected point of the wind power plant and inputs the three-phase voltage 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 of a grid-connected point of the wind power plant in an initial state and three-phase voltage and three-phase current of a voltage disturbance state by using a data recording analyzer, and calculating reactive power in the initial state.
Preferably, the first and second electrodes are formed of a metal,
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 an error between an average value and a target value after the reactive power changes from an initial value to the target value and enters a steady state.
The device of the detection method of the wind power plant voltage control function comprises a wind power plant voltage control system, a voltage transformer and a current transformer which are arranged at a wind power plant grid-connected point; the device also comprises a data recording 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 first and second electrodes are formed of a metal,
the device comprises two modes of operation:
(1) detecting a mode of a corresponding relation between voltage fluctuation and reactive power of a grid-connected point of the wind power plant, wherein at the moment, a voltage input end of a voltage control system of the wind power plant is connected with a secondary side of a voltage transformer, and a current input end of the voltage control system of the wind power plant is connected with a secondary side of a current transformer;
(2) a wind power plant voltage control function detection mode, wherein at the moment, the voltage input end of a wind power plant voltage control system is connected with the voltage output end of a voltage disturbance generation device, and the current input end of the wind power plant voltage control system is connected with the 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 first and second electrodes are formed of a metal,
the precision of the voltage transformer and the precision of the current transformer are 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 2.5 kHz.
The voltage disturbance generating device is in 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.
Compared with the prior art, the invention has the beneficial effects that:
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 to be out of the voltage control dead zone through the voltage disturbance generating device, the reactive power change condition of the grid-connected point is analyzed through the data recording analyzer, and the voltage control response time and the control precision of the wind power plant can be detected by utilizing the corresponding condition of the reactive power change and 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 cannot be 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 of detecting a wind farm voltage control function of the present invention;
FIG. 2 is a schematic wiring diagram illustrating normal operation of a wind farm in accordance with a preferred embodiment of the present invention;
FIG. 3 is a schematic wiring diagram of the detection equipment with the voltage control function of the wind farm in the detection mode of the corresponding relationship between the voltage fluctuation and the reactive power of the grid-connected point of the wind farm according to the invention;
FIG. 4 is a schematic wiring diagram of the detection device for wind farm voltage control function according to the present invention, in a wind farm voltage control function detection mode;
FIG. 5 is a wave recording curve diagram of a data recording analyzer of the detection equipment for the voltage control function of the wind farm in the detection mode of the corresponding relationship between the voltage fluctuation and the reactive power of the grid-connected point of the wind farm;
FIG. 6 is a wave recording curve diagram of a data recording analyzer of the wind farm voltage control function detection device in the wind farm voltage control function detection mode according to the present invention;
fig. 7 is a wave recording curve diagram of a data recording analyzer about voltage control response time and control accuracy of the detection device for wind farm voltage control function of the present invention.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
The invention discloses a detection method of a voltage control function of a wind power plant, 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 voltage of a grid-connected point of the wind power plant to fluctuate from an initial state to be out of a voltage control dead zone; the method comprises the steps of collecting three-phase voltage of a wind power plant grid-connected point in an initial state and three-phase voltage of a voltage disturbance state, and detecting indexes of a voltage control function of the wind power plant based on the constant short-time short circuit capacity of the wind power plant grid-connected point.
As shown in fig. 1, a method for detecting a voltage control function of a wind farm includes the following steps:
step 1, acquiring short-time short circuit capacity of a wind power plant grid-connected point in advance.
In particular, the amount of the solvent to be used,
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 using the acquired voltage and current;
step 1.3, calculating the short-time short circuit capacity of the wind power plant grid-connected point according to the following relational expression:
in the formula (I), the compound is shown in the specification,
U1、U2respectively representing a first voltage control target value and a second voltage control target value set by a wind power plant voltage control system;
Unrepresenting the rated voltage of a grid-connected point of a wind power plant;
Q1、Q2and respectively representing the first reactive power and the second reactive power corresponding to the first voltage control target value and the second voltage control target value.
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 a grid connection point of a wind power plant; the voltage transformer collects the three-phase voltage of a grid-connected point of the wind power plant and inputs the three-phase voltage to the wind power plant AVC system and 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.
And step 1.2, under different voltage control target values, recording three-phase voltage and three-phase current of the grid-connected point of the electric field by using a data recording analyzer, and calculating corresponding reactive power.
Step 1.2, actually, detecting the corresponding relation between voltage fluctuation and reactive power, and in the detection mode, as shown in fig. 3, a voltage transformer PT collects the three-phase voltage of a grid-connected point of a 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 CT collects three-phase current of grid-connected points of the wind power plant and inputs the three-phase current to the wind power plant AVC system and the data recording analyzer.
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 by the lower curve in FIG. 5; at the time of 60s, when the voltage control target value is changed, the reactive power is decreased, as shown by the upper curve in fig. 5; and the data recording analyzer calculates to obtain that the reactive power is changed from 1.2MVar to-18.5 MVar according to the input three-phase voltage and current.
It is to be noted that those skilled in the art can adopt different types of devices to record, calculate and display the voltage, the current and the reactive power according to the practical application. In the preferred embodiment of the present invention, a data recording analyzer is used to record, calculate and display the voltage, current and reactive power, which is a non-limiting preferred choice.
In step 1.3, according to the fact that the short-circuit capacity of a certain point of the power system in a certain short time is a fixed value, in the preferred embodiment, the short-time short-circuit capacity of the wind power plant grid-connected point is calculated to be 4344 MVA.
Step 2, inputting the voltage disturbance signal into an AVC system of the wind power plant; controlling a voltage disturbance signal to enable the voltage of a grid-connected point of the wind power plant to fluctuate from an initial state to be out of a voltage control dead zone; the method comprises the steps of collecting three-phase voltage and three-phase current of a wind power plant grid-connected point in an initial state and three-phase voltage and three-phase current of a voltage disturbance state.
In particular, the amount of the solvent to be used,
as shown in fig. 4, in step 2, the voltage disturbance signal is generated by the voltage disturbance signal generating device; and the voltage disturbance signal is input into the wind power plant AVC system and is also input into the data recording analyzer.
A voltage transformer PT and a current transformer CT are arranged at a grid connection point of the wind power plant; a voltage transformer PT collects three-phase voltage of a grid-connected point of a wind power plant and inputs the three-phase voltage to a data recording analyzer; the method comprises the following steps that a current transformer CT collects three-phase current of a grid-connected point of a wind power plant and inputs the three-phase current to an AVC system and a data recording analyzer of the wind power plant; and the voltage disturbance signal generation device inputs the voltage disturbance signal into the wind power plant AVC system and the data recording analyzer.
In the prior art, a current collection circuit is usually cut off to enable the voltage of a grid-connected point of a wind power plant to fluctuate outside a voltage control dead zone so as to verify whether an AVC system can adjust 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 acquire the secondary voltage signal of the grid-connected point any more, and the voltage signal is completely provided by the voltage disturbance signal generating device, so that the operation process that the voltage fluctuation of the grid-connected point of the wind power plant is beyond the voltage control dead zone can be simulated under the condition of not cutting off a current collecting line. Therefore, the problems that the wind power plant loses electric quantity, economic benefits are influenced, and a wind turbine generator is damaged due to the fact that the voltage control function of the wind power plant is carried out are effectively solved.
It is noted that those skilled in the art can adopt different types of devices to realize the voltage fluctuation according to the actual application requirements. In the preferred embodiment of the present invention, a voltage disturbance signal generating device is used to realize voltage fluctuation, which is a non-limiting preferred choice.
And recording three-phase voltage and three-phase current of a grid-connected point of the wind power plant in an initial state and three-phase voltage and three-phase current of a 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, a voltage disturbance generating device is used to simulate the voltage fluctuation of a grid-connected point of a wind farm to be outside a voltage control dead zone, and the voltage of the grid-connected point fluctuates from 228.50kV to 229.60kV, as shown by a lower curve in fig. 6; and the data recording analyzer calculates and analyzes the change condition of the reactive power of the grid-connected point according to the input three-phase voltage and current, and the initial value of the reactive power corresponding to the grid-connected point with the voltage of 228.50kV is-41 MVar after calculation.
And 3, calculating reactive power corresponding to the disturbance voltage by using the voltage collected in the step 2 and the reactive power obtained by calculation according to the constant short-circuit capacity of the wind power plant grid-connected point.
In particular, the amount of the solvent to be used,
and calculating reactive power corresponding to the disturbance voltage outside the control dead zone according to the following relational expression:
in the formula (I), the compound is shown in the specification,
U1、U2respectively representing a first voltage control target value and a second voltage control target value set by an AVC system of the wind power plant;
U、U0respectively representing a disturbance voltage and an initial voltage;
Q1、Q2respectively representing a first reactive power and a second reactive power corresponding to the first voltage control target value and the second voltage control target value;
Q、Q0respectively representing the reactive power corresponding to the disturbance voltage and the initial voltage.
In the preferred embodiment, the calculated voltage is changed from 228.50kV to 229.60kV according to the fixed value of the short-time short circuit capacity of the wind power plant grid-connected point, and the corresponding reactive power is-19.33 MVar when the disturbance voltage is 229.60 kV.
And 4, detecting indexes of the voltage control function of the wind power plant according to the change data of the reactive power in the process that the voltage of the grid-connected point of the wind power plant fluctuates from the initial state to the outside of the voltage control dead zone, namely calculating the voltage control response time and the voltage control precision.
In particular, the amount of the solvent to be used,
in the step 4, the process of the method,
the voltage control response time is the time required for the reactive power to change from the initial value to the 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 1.18 s.
In particular, the amount of the solvent to be used,
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 the steady state;
in the preferred embodiment, as shown in fig. 7, the initial value of the reactive power is-41 MVar, and gradually enters the steady state after the value is changed to-19.33 MVar, and the error between the average value and the target value is 4.24%, that is, the voltage control precision is 4.24%.
Referring to fig. 3 and 4, the detection device for the voltage control function of the wind farm comprises a wind farm AVC system, a voltage transformer PT and a current transformer CT which are arranged at a grid connection point of the wind farm;
the detection equipment also comprises a data recording analyzer and a voltage disturbance generating device; the voltage input end of the data recording analyzer is connected with the secondary side of a voltage transformer PT, and the current input end of the data recording analyzer is connected with the secondary side of a current transformer CT.
In particular, the amount of the solvent to be used,
the detection device comprises two operation modes:
(1) detecting a mode of a corresponding relation between voltage fluctuation and reactive power of a grid-connected point of a wind power plant, wherein at the moment, as shown in FIG. 3, a voltage input end of an AVC system of the wind power plant is connected with a secondary side of a voltage transformer PT, and a current input end is connected with a secondary side of a current transformer CT;
in the operation mode, in the detection equipment with the wind power plant voltage control function, the voltage data and the reactive power data which are recorded, calculated, analyzed and displayed by the data recording analyzer are all data of the AVC system of the wind power plant, so that the corresponding relation detection of the voltage fluctuation and the reactive power of the wind power plant grid-connected point is realized in a normal operation state, the detection operation is convenient and fast, the device is simple, and the detection accuracy is high.
(2) In the wind farm voltage control function detection mode, at this time, 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 generation device, and a current input end 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, voltage data and reactive power data which are recorded, calculated, analyzed and displayed by a data recording analyzer are also various data of an AVC (automatic voltage control) system of the wind power plant, and disturbance voltage can be directly recorded and analyzed; therefore, whether the voltage of the wind power plant AVC system can be regulated back to the control target value or not 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 power plant AVC system are calculated by utilizing the corresponding situation of reactive power change and voltage change in a disturbance state, 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 amount of the solvent to be used,
the precision of the voltage transformer and the precision of the current transformer are 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 2.5 kHz.
The voltage disturbance generating device is in 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, a person 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 application requirements of engineering, and the parameter selection in the effective embodiment of the present invention is a non-limiting preferred selection.
Compared with the prior art, the invention has the beneficial effects that:
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 to be out of the voltage control dead zone through the voltage disturbance generating device, the reactive power change condition of the grid-connected point is analyzed through the data recording analyzer, and the voltage control response time and the control precision of the wind power plant can be detected by utilizing the corresponding condition of the reactive power change and 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 cannot be 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.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely 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 for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (10)
1. A detection method for wind power plant voltage control function is characterized in that,
the detection method comprises the steps of inputting a voltage disturbance signal into a voltage control system of the wind power plant, and controlling the voltage disturbance signal to enable the voltage of a grid-connected point of the wind power plant to fluctuate from an initial state to a position outside a voltage control dead zone; the method comprises the steps of collecting three-phase voltage of a wind power plant grid-connected point in an initial state and three-phase voltage of a voltage disturbance state, and detecting indexes of a voltage control function of the wind power plant based on the constant short-time short circuit capacity of the wind power plant grid-connected point.
2. The method for detecting the voltage control function of the wind farm according to claim 1,
the detection method comprises the following steps:
step 1, acquiring short-time short circuit capacity of a wind power plant grid-connected point in advance;
step 2, inputting the voltage disturbance signal into a voltage control system of the wind power plant; controlling a voltage disturbance signal to enable the voltage of a grid-connected point 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 wind power plant grid-connected point in an initial state and three-phase voltage and three-phase current of a voltage disturbance state;
step 3, calculating reactive power corresponding to the disturbance voltage by using the voltage collected in the step 2 and the reactive power obtained by calculation according to the constant short-circuit capacity of the wind power plant grid-connected point;
and 4, detecting indexes of the voltage control function of the wind power plant according to the change data of the reactive power in the process that the voltage of the grid-connected point of the wind power plant fluctuates from the initial state to the outside of the voltage control dead zone, namely calculating the voltage control response time and the voltage control precision.
3. A method of detection of wind farm voltage control functionality according to claims 1 and 2,
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 using the collected voltage and current;
step 1.3, calculating the short-time short circuit capacity of the wind power plant grid-connected point according to the following relational expression:
in the formula (I), the compound is shown in the specification,
U1、U2respectively representing a first voltage control target value and a second voltage control target value set by a wind power plant voltage control system;
Unrepresenting the rated voltage of a grid-connected point of a wind power plant;
Q1、Q2and respectively representing the first reactive power and the second reactive power corresponding to the first voltage control target value and the second voltage control target value.
4. A method of detecting wind farm voltage control functionality according to claim 3,
in the step 1.1, a voltage transformer and a current transformer are arranged at a grid connection point of the wind power plant; the voltage transformer collects the 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;
and step 1.2, under different voltage control target values, recording three-phase voltage and three-phase current of the grid-connected point of the electric field by using a data recording analyzer, and calculating corresponding reactive power.
5. A method of detection of wind farm voltage control functionality according to claims 1 and 2,
in step 2, the voltage disturbance signal is generated by a voltage disturbance signal generating device; the voltage disturbance signal is input into the wind power plant voltage control system and also input into the data recording analyzer.
6. A method of detection of wind farm voltage control functionality according to claims 1 and 2,
in the step 2, a voltage transformer and a current transformer are arranged at a grid connection point of the wind power plant; the voltage transformer collects the three-phase voltage of a grid-connected point of the wind power plant and inputs the three-phase voltage 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 of a grid-connected point of the wind power plant in an initial state and three-phase voltage and three-phase current of a voltage disturbance state by using a data recording analyzer, and calculating reactive power in the initial state.
7. A method of detection of wind farm voltage control functionality according to claims 1 and 2,
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 an error between an average value and a target value after the reactive power changes from an initial value to the target value and enters a steady state.
8. Device for utilizing a method for detection of a wind farm voltage control function according to claims 1 to 7, comprising a wind farm voltage control system, a voltage transformer and a current transformer arranged at a wind farm grid-connection point,
the equipment also comprises a data recording analyzer and a voltage disturbance generating device; and 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.
9. The wind farm voltage control function detection apparatus according to claim 8,
the device comprises two modes of operation:
(1) a wind power plant grid-connected point voltage fluctuation and reactive power corresponding relation detection mode is adopted, at the moment, the voltage input end of a wind power plant voltage control system is connected with the secondary side of the voltage transformer, and the current input end of the wind power plant voltage control system is connected with the secondary side of the current transformer;
(2) a wind power plant voltage control function detection mode, wherein 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 generation 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.
10. The wind farm voltage control function detection apparatus according to claim 8,
the precision of the voltage transformer and the precision of the current transformer are 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 2.5 kHz.
The voltage disturbance generating device is in 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.
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