CN106026166B - Reactive capacity detection method for new energy power station accessed to weak power grid - Google Patents

Reactive capacity detection method for new energy power station accessed to weak power grid Download PDF

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CN106026166B
CN106026166B CN201610474492.7A CN201610474492A CN106026166B CN 106026166 B CN106026166 B CN 106026166B CN 201610474492 A CN201610474492 A CN 201610474492A CN 106026166 B CN106026166 B CN 106026166B
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new energy
reactive
power station
energy power
grid
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CN106026166A (en
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樊熠
张金平
李庆
张元栋
陈子瑜
贺敬
张梅
唐建芳
朱琼锋
王顺来
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Cec Saipu Examination Authentication Beijing Co ltd
State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
State Grid Shanxi Electric Power Co Ltd
CLP Puri Zhangbei Wind Power Research and Test Ltd
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Cec Saipu Examination Authentication Beijing Co ltd
State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
State Grid Shanxi Electric Power Co Ltd
CLP Puri Zhangbei Wind Power Research and Test Ltd
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    • H02J3/386—
    • G—PHYSICS
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1892—Arrangements for adjusting, eliminating or compensating reactive power in networks the arrangements being an integral part of the load, e.g. a motor, or of its control circuit
    • H02J3/383—
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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

Abstract

The invention provides a method for detecting the reactive capacity of a new energy power station accessed to a weak power grid, which comprises the following steps: determining a reactive capacity detection object of the new energy power station; detecting the reactive capacity of a converter/photovoltaic grid-connected inverter of the wind turbine generator; detecting the reactive capacity of a reactive power compensation device of the new energy power station; and determining the reactive capacity of the new energy power station. The invention detects the reactive capacity of the reactive power compensation device of the new energy power station and the wind generating set converter/photovoltaic grid-connected inverter within the allowable voltage operation range (power grid dispatching requirement or historical data), and ensures effective field station reactive capacity detection according to relevant standards. By adjusting the operation modes of different types of reactive power supplies in the new energy power station, the reactive capacity of the new energy power station can be effectively detected in the weak area of the net rack. The method is a feasible method for detecting the reactive capacity of the new energy power station for the power system dispatching mechanism, the wind power plant operator and the related detection mechanism.

Description

Reactive capacity detection method for new energy power station accessed to weak power grid
Technical Field
The invention belongs to the technical field of new energy access and control, and particularly relates to a method for detecting reactive capacity of a new energy power station accessed to a weak power grid.
Background
According to the requirements of the action plan of the energy development strategy in China, the consumption proportion of non-fossil energy in China to primary energy is up to 15% by 2020, and the consumption proportion of renewable energy such as wind power, solar energy, geothermal energy and the like is greatly increased. With the increasing proportion of installed capacity of new energy resources such as wind power/photovoltaic and the like in a power grid in China, the influence of wind power/photovoltaic grid-connected operation of a new energy power station on the power grid becomes more and more obvious, and the stability and adjustability of the voltage of a grid-connected point (output convergent point) of the new energy power station are related to the safe and stable operation of the power grid, so that the accurate testing of the reactive capacity of the new energy power station is particularly important.
Through field investigation and actual test, the problem existing in the reactive capacity detection process of the new energy power station in China at present is found, and the detection task is difficult to be effectively completed.
Because the new energy power station is mostly positioned at the tail end of a power grid, the voltage fluctuation is large, and in order to enable the voltage of a grid-connected point (output convergence point) to operate in a reasonable range (required by a power system dispatching mechanism), the reactive capacity detection cannot be effectively carried out. For example, when a certain new energy power station does not work, the operation voltage of a grid-connected point can be as high as 40 kV; in order to ensure that the voltage of the power grid operates in a reasonable range, the reactive compensation device matched with the new energy power station operates in an inductive reactive output state for a long time, so that the voltage of a grid-connected point can be kept between 37 and 38 kV; in this state, it is difficult to effectively detect the capacity of the reactive power source according to the conventional AVC control method.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for detecting the reactive capacity of a new energy power station accessed to a weak power grid, which is used for detecting the reactive capacity of a reactive power compensation device of the new energy power station and a wind generating set converter/photovoltaic grid-connected inverter within an allowed voltage operating range (required by a power system dispatching mechanism or historical data), and ensuring that effective field station reactive capacity detection is carried out according to relevant standards. By adjusting the operation modes of different types of reactive power supplies in the new energy power station, the reactive capacity of the new energy power station can be effectively detected in the weak area of the net rack. The method is a feasible method for detecting the reactive capacity of the new energy power station for the power dispatching department, the wind power plant operator and the related detection mechanism.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
the invention provides a method for detecting the reactive capacity of a new energy power station accessed to a weak power grid, which comprises the following steps:
step 1: determining a reactive capacity detection object of the new energy power station;
step 2: detecting the reactive capacity of a converter/photovoltaic grid-connected inverter of the wind turbine generator;
and step 3: detecting the reactive capacity of a reactive power compensation device of the new energy power station;
and 4, step 4: and determining the reactive capacity of the new energy power station.
In the step 1, the new energy power station reactive capacity detection object comprises a wind power plant reactive power supply and a photovoltaic power station reactive power supply.
The wind power plant reactive power supply comprises a wind turbine generator converter and a wind power plant reactive power compensation device;
the photovoltaic power station reactive power supply comprises a photovoltaic grid-connected inverter and a photovoltaic power station reactive power compensation device.
The step 2 comprises the following steps:
step 2-1: determining the voltage operation range of a grid-connected point of a new energy power station, and setting an over/under voltage protection fixed value;
step 2-2: the reactive power compensation device of the new energy power station is set to be in a constant reactive power control mode through an AVC system or a reactive power compensation device control system;
step 2-3: the reactive power output of the wind turbine converter/photovoltaic grid-connected inverter is gradually set to 0Mvar through an AVC system or an EMS system;
step 2-4: adjusting a reactive power set value of a reactive power compensation device of the new energy power station, and controlling the voltage of a grid-connected point of the new energy power station within a required operation range;
step 2-5: the method comprises the steps that an AVC system or an EMS system issues a first control instruction, the operation mode of a wind turbine converter/photovoltaic grid-connected inverter is set to be a constant voltage control mode according to the first control instruction, and a target voltage tracking value of the wind turbine converter/photovoltaic grid-connected inverter is set to be a given value for receiving the AVC system or the EMS system;
step 2-6: and the AVC system or the EMS system issues a first target instruction to test the reactive capacity of the wind turbine converter/photovoltaic grid-connected inverter.
In the step 3, the reactive compensation device of the new energy power station comprises a wind power plant reactive compensation device and a photovoltaic power station reactive compensation device.
The step 3 comprises the following steps:
step 3-1: determining the voltage operation range of a grid-connected point of a new energy power station, and setting an over/under voltage protection fixed value;
step 3-2: setting the operation mode of the wind turbine converter/photovoltaic grid-connected inverter into a constant reactive power control mode through an AVC system or an EMS system;
step 3-3: gradually setting the reactive power output of the reactive power compensation device of the new energy power station to 0Mvar through an AVC system or a reactive power compensation device control system;
step 3-4: adjusting a reactive power set value of a wind turbine converter/photovoltaic grid-connected inverter through an AVC system or an EMS system to control the voltage of a grid-connected point of a new energy power station within a required operation range;
step 3-5: issuing a second control instruction through an AVC system or a reactive power compensation device control system, setting the operation mode of the reactive power compensation device of the new energy power station into a constant voltage control mode according to the second control instruction, and setting a target voltage tracking value of the reactive power compensation device of the new energy power station into a given value for receiving the AVC system or the EMS system;
step 3-6: and the AVC system or the reactive power compensation device control system issues a second target instruction to test the reactive power capacity of the reactive power compensation device of the new energy power station.
Determining the bus voltage operation range of the new energy power station according to the operation experience of the new energy power station and the operation requirement of a power system scheduling mechanism on the grid-connected point voltage of the new energy power station; and setting over/under voltage protection fixed values of the current collection circuit, the reactive power compensation device of the new energy power station and the wind power set converter, or setting over/under voltage protection fixed values of the current collection circuit, the reactive power compensation device of the new energy power station and the photovoltaic grid-connected inverter.
Setting the grid-connected point voltage reference value of the new energy power station as UrefThe method comprises the following steps:
Uref＝(Umax+Umin)/2 (1)
wherein, UmaxRepresents the allowable operation upper limit value, U, of the grid-connected point voltage given by the operation experience of the power system dispatching mechanism or the new energy power stationminIndicating electric power system scheduling mechanisms or new energyThe grid-connected point voltage given by the operation experience of the source power station allows the operation of a lower limit value.
The first target instruction and the second target instruction both comprise a grid-connected point voltage allowable operation upper limit value U given by an electric power system dispatching mechanism or new energy power station operation experiencemaxAnd a grid-connected point voltage allowable operation lower limit value U given by an electric power system dispatching mechanism or a new energy power station operation experiencemin。
In the step 3, the reactive capacity of the new energy power station comprises the total capacitive reactive capacity Q of the new energy power stationcAnd total inductive reactive capacity Q of new energy power stationL，QcAnd QLRespectively expressed as:
Qc＝Qc1+Qc2 (2)
QL＝QL1+QL2 (3)
wherein Q isc1Representing the capacitive reactive capacity, Q, of a new energy power station grid-connected point when a wind turbine converter/photovoltaic grid-connected inverter is independently testedc2Representing the capacitive reactive capacity, Q, of the new energy power station grid-connected point when the reactive compensation device of the new energy power station is tested independentlyL1Representing the inductive reactive capacity, Q, of a new energy power station grid-connected point when a wind turbine converter/photovoltaic grid-connected inverter is tested independentlyL2And the inductive reactive capacity of the new energy power station grid-connected point is shown when the reactive compensation device of the new energy power station is independently tested.
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) the method for detecting the reactive capacity of the new energy power station accessed to the weak power grid is convenient for field operation, can accurately measure the real reactive capacity of the new energy power station within the voltage operation range required by a power system dispatching mechanism, and simultaneously reduces the influence degree on the power grid to the minimum;
(2) the method for detecting the reactive capacity of the new energy power station accessed to the weak power grid solves the problem that the new energy power station in the weak area of the power grid network frame can not effectively detect the reactive capacity within a reasonable voltage operation range (a given value or operation experience data of a power system dispatching mechanism).
Drawings
FIG. 1 is a schematic block diagram of reactive voltage control of a new energy power station in an embodiment of the invention;
FIG. 2 is a flow chart of reactive capacity detection of a wind turbine converter/photovoltaic grid-connected inverter according to an embodiment of the present invention;
fig. 3 is a flow chart of reactive capacity detection of the reactive power compensation device of the new energy power station in the embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention provides a method for detecting the reactive capacity of a new energy power station accessed to a weak power grid, which comprises the steps of firstly adjusting the protection setting values of a reactive power compensation device of the new energy power station, a wind turbine generator converter/photovoltaic grid-connected inverter and a power collection line according to the running conditions of a local power grid and the new energy power station and by combining the requirements of a power system dispatching mechanism so as to quickly and accurately cut off relevant equipment or lines when voltage exceeds the limit; secondly, checking the operation control capability of the AVC system of the new energy power station and whether the communication among the devices is normal; and finally, checking the control and operation capabilities of the reactive power compensation device background and the EMS system. The specific scheme is as follows:
by adjusting the operation modes of the reactive power compensation device of the new energy power station and the wind generating set converter/photovoltaic grid-connected inverter, the new energy power station and the wind generating set converter/photovoltaic grid-connected inverter can operate in different working modes at the same time, the adjustable range of the voltage of a grid-connected point is increased, and the purpose of effectively measuring the reactive capacity is achieved. The reactive power control schematic block diagram of the new energy power station is shown in fig. 1.
The invention provides a method for detecting the reactive capacity of a new energy power station accessed to a weak power grid, which comprises the following steps:
step 1: determining a reactive capacity detection object of the new energy power station;
step 2: detecting the reactive capacity of a converter/photovoltaic grid-connected inverter of the wind turbine generator;
and step 3: detecting the reactive capacity of a reactive power compensation device of the new energy power station;
and 4, step 4: and determining the reactive capacity of the new energy power station.
The new energy power station reactive capacity detection object comprises a wind power plant reactive power supply and a photovoltaic power station reactive power supply. The method comprises the following steps that national standard GB/T19963 plus 2011 'specification for accessing a wind power plant into an electric power system' and national standard GB/T19964 plus 2012 'specification for accessing a photovoltaic power station into an electric power system' clearly specify the reactive capacity of the wind power plant/photovoltaic power station, wherein the reactive power source of the wind power plant comprises a wind turbine generator converter and a wind power plant reactive power compensation device; the photovoltaic power station reactive power supply comprises a photovoltaic grid-connected inverter and a photovoltaic power station reactive power compensation device.
As shown in fig. 2, the step 2 includes the following steps:
step 2-1: determining a voltage operation range of a new energy power station grid-connected point (output convergence point), and setting an over/under voltage protection fixed value;
step 2-2: the reactive power compensation device of the new energy power station is set to be in a constant reactive power Control mode through an AVC (Automatic Voltage Control) system or a reactive power compensation device Control system;
step 2-3: the reactive power output of a wind turbine converter/photovoltaic grid-connected inverter is gradually set to 0Mvar through an AVC system or an EMS (energy management system);
step 2-4: adjusting a reactive power set value of a reactive power compensation device of the new energy power station, and controlling the voltage of a new energy power station grid-connected point (output convergence point) within a required operation range;
step 2-5: the method comprises the steps that an AVC system or an EMS system issues a first control instruction, a wind turbine converter/photovoltaic grid-connected inverter is set to be in a constant voltage control mode according to the first control instruction, and a target voltage tracking value of the wind turbine converter/photovoltaic grid-connected inverter is set to be a given value for receiving the AVC system or the EMS system;
step 2-6: and the AVC system or the EMS system issues a first target instruction to test the reactive capacity of the wind turbine converter/photovoltaic grid-connected inverter.
In the step 3, the reactive compensation device of the new energy power station comprises a wind power plant reactive compensation device and a photovoltaic power station reactive compensation device.
As shown in fig. 3, the step 3 includes the following steps:
step 3-1: determining a voltage operation range of a new energy power station grid-connected point (output convergence point), and setting an over/under voltage protection fixed value;
step 3-2: the wind turbine converter/photovoltaic grid-connected inverter is set to be in a constant reactive power control mode through an AVC system or an EMS system;
step 3-3: gradually setting the reactive power output of the reactive power compensation device of the new energy power station to 0Mvar through an AVC system or a reactive power compensation device control system;
step 3-4: adjusting a reactive power set value of a wind turbine converter/photovoltaic grid-connected inverter through an AVC system or an EMS system, and controlling the voltage of a grid-connected point (output convergent point) of a new energy power station within a required operation range;
step 3-5: issuing a second control instruction through an AVC system or a reactive power compensation device control system, setting the reactive power compensation device of the new energy power station into a constant voltage control mode according to the second control instruction, and setting a target voltage tracking value of the reactive power compensation device of the new energy power station into a given value for receiving the AVC system or the EMS system;
step 3-6: and the AVC system or the reactive power compensation device control system issues a second target instruction to test the reactive power capacity of the reactive power compensation device of the new energy power station.
Determining the voltage operating range of a new energy power station grid-connected point (output convergence point) according to the operating experience of the new energy power station and the operating requirement of a power system scheduling mechanism on the voltage of the new energy power station grid-connected point (output convergence point); and setting over/under voltage protection fixed values of the current collection circuit, the reactive power compensation device of the new energy power station and the wind power set converter, or setting over/under voltage protection fixed values of the current collection circuit, the reactive power compensation device of the new energy power station and the photovoltaic grid-connected inverter.
Setting the voltage reference value of a new energy power station grid-connected point (output convergence point) as UrefThe method comprises the following steps:
Uref＝(Umax+Umin)/2 (1)
wherein, UmaxIndicating electric power system dispatching mechanisms orAllowable operation upper limit value, U, of grid-connected point voltage given by operation experience of new energy power stationminAnd the lower limit value of the allowable operation of the grid-connected point voltage given by the operation experience of the power system dispatching mechanism or the new energy power station is shown.
The first target instruction and the second target instruction both comprise a grid-connected point voltage allowable operation upper limit value U given by an electric power system dispatching mechanism or new energy power station operation experiencemaxAnd a grid-connected point voltage allowable operation lower limit value U given by an electric power system dispatching mechanism or a new energy power station operation experiencemin。
In the step 3, the reactive capacity of the new energy power station comprises the total capacitive reactive capacity Q of the new energy power stationcAnd total inductive reactive capacity Q of new energy power stationL，QcAnd QLRespectively expressed as:
Qc＝Qc1+Qc2 (2)
QL＝QL1+QL2 (3)
wherein Q isc1Representing the capacitive reactive capacity, Q, of a new energy power station grid-connected point (output convergence point) when a wind turbine converter/photovoltaic grid-connected inverter is tested independentlyc2Represents the capacitive reactive capacity, Q, of the new energy power station grid-connected point (output convergence point) when the reactive compensation device of the new energy power station is tested independentlyL1Representing the inductive reactive capacity, Q, of a new energy power station grid-connected point (output convergence point) when a wind turbine converter/photovoltaic grid-connected inverter is tested independentlyL2And the inductive reactive capacity of a new energy power station grid-connected point (output convergence point) is shown when the reactive compensation device of the new energy power station is tested independently.
Finally, it should be noted that: the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and a person of ordinary skill in the art can make modifications or equivalents to the specific embodiments of the present invention with reference to the above embodiments, and such modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims of the present invention as set forth in the claims.

Claims (7)

1. A method for detecting reactive capacity of a new energy power station accessed to a weak power grid is characterized by comprising the following steps: the method comprises the following steps:
step 1: determining a reactive capacity detection object of the new energy power station;
step 2: detecting the reactive capacity of a converter/photovoltaic grid-connected inverter of the wind turbine generator;
and step 3: detecting the reactive capacity of a reactive power compensation device of the new energy power station;
and 4, step 4: determining the reactive capacity of the new energy power station;
in the step 1, the reactive capacity detection object of the new energy power station comprises a wind power plant reactive power supply and a photovoltaic power station reactive power supply;
the wind power plant reactive power supply comprises a wind turbine generator converter and a wind power plant reactive power compensation device;
the photovoltaic power station reactive power supply comprises a photovoltaic grid-connected inverter and a photovoltaic power station reactive compensation device;
the step 2 comprises the following steps:
step 2-1: determining the voltage operation range of a grid-connected point of a new energy power station, and setting an over/under voltage protection fixed value;
step 2-2: the reactive power compensation device of the new energy power station is set to be in a constant reactive power control mode through an AVC system or a reactive power compensation device control system;
step 2-3: the reactive power output of the wind turbine converter/photovoltaic grid-connected inverter is gradually set to 0Mvar through an AVC system or an EMS system;
step 2-4: adjusting a reactive power set value of a reactive power compensation device of the new energy power station, and controlling the voltage of a grid-connected point of the new energy power station within a required operation range;
step 2-5: the method comprises the steps that an AVC system or an EMS system issues a first control instruction, the operation mode of a wind turbine converter/photovoltaic grid-connected inverter is set to be a constant voltage control mode according to the first control instruction, and a target voltage tracking value of the wind turbine converter/photovoltaic grid-connected inverter is set to be a given value for receiving the AVC system or the EMS system;
step 2-6: and the AVC system or the EMS system issues a first target instruction to test the reactive capacity of the wind turbine converter/photovoltaic grid-connected inverter.
2. The method for detecting the reactive capacity of the new energy power station accessed to the weak grid according to claim 1, is characterized in that: in the step 3, the reactive compensation device of the new energy power station comprises a wind power plant reactive compensation device and a photovoltaic power station reactive compensation device.
3. The method for detecting the reactive capacity of the new energy power station accessed to the weak grid as claimed in claim 2, wherein the method comprises the following steps: the step 3 comprises the following steps:
step 3-1: determining the voltage operation range of a grid-connected point of a new energy power station, and setting an over/under voltage protection fixed value;
step 3-2: the wind turbine converter/photovoltaic grid-connected inverter is set to be in a constant reactive power control mode through an AVC system or an EMS system;
step 3-3: gradually setting the reactive power output of the reactive power compensation device of the new energy power station to 0Mvar through an AVC system or a reactive power compensation device control system;
step 3-4: adjusting a reactive power set value of a wind turbine converter/photovoltaic grid-connected inverter through an AVC system or an EMS system to control the voltage of a grid-connected point of a new energy power station within a required operation range;
step 3-5: issuing a second control instruction through an AVC system or a reactive power compensation device control system, setting the operation mode of the reactive power compensation device of the new energy power station into a constant voltage control mode according to the second control instruction, and setting a target voltage tracking value of the reactive power compensation device of the new energy power station into a given value for receiving the AVC system or the EMS system;
step 3-6: and the AVC system or the reactive power compensation device control system issues a second target instruction to test the reactive power capacity of the reactive power compensation device of the new energy power station.
4. The method for detecting the reactive capacity of the new energy power station accessed to the weak grid according to claim 1 or 3, characterized by comprising the following steps: determining the voltage operation range of the grid-connected point of the new energy power station according to the operation experience of the new energy power station and the operation requirement of a power system scheduling mechanism on the grid-connected point voltage of the new energy power station; and setting over/under voltage protection fixed values of the current collection circuit, the reactive power compensation device of the new energy power station and the wind power set converter, or setting over/under voltage protection fixed values of the current collection circuit, the reactive power compensation device of the new energy power station and the photovoltaic grid-connected inverter.
5. The method for detecting the reactive capacity of the new energy power station accessed to the weak grid according to claim 1 or 3, characterized by comprising the following steps: setting the grid-connected point voltage reference value of the new energy power station as UrefThe method comprises the following steps:
Uref＝(Umax+Umin)/2 (1)
wherein, UmaxRepresents the allowable operation upper limit value, U, of the grid-connected point voltage given by the operation experience of the power system dispatching mechanism or the new energy power stationminAnd the lower limit value of the allowable operation of the grid-connected point voltage given by the operation experience of the power system dispatching mechanism or the new energy power station is shown.
6. The method for detecting the reactive capacity of the new energy power station accessed to the weak grid according to claim 1 or 3, characterized by comprising the following steps: the first target instruction and the second target instruction both comprise a grid-connected point voltage allowable operation upper limit value U given by an electric power system dispatching mechanism or new energy power station operation experiencemaxAnd a grid-connected point voltage allowable operation lower limit value U given by an electric power system dispatching mechanism or a new energy power station operation experiencemin。
7. The method for detecting the reactive capacity of the new energy power station accessed to the weak grid, according to claim 3, is characterized in that: in the step 3, the reactive capacity of the new energy power station comprises the total capacitive reactive capacity Q of the new energy power stationcAnd total inductive reactive capacity Q of new energy power stationL，QcAnd QLRespectively expressed as:
Qc＝Qc1+Qc2 (2)
QL＝QL1+QL2 (3)
wherein Q isc1Representing the capacitive reactive capacity, Q, of a new energy power station grid-connected point when a wind turbine converter/photovoltaic grid-connected inverter is independently testedc2Representing the capacitive reactive capacity, Q, of the new energy power station grid-connected point when the reactive compensation device of the new energy power station is tested independentlyL1Representing the inductive reactive capacity, Q, of a new energy power station grid-connected point when a wind turbine converter/photovoltaic grid-connected inverter is tested independentlyL2And the inductive reactive capacity of the new energy power station grid-connected point is shown when the reactive compensation device of the new energy power station is independently tested.
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