CN111082455A - Wind power plant grid-connected performance monitoring method and system - Google Patents

Abstract

The invention provides a method for monitoring grid-connected performance of a wind power plant, which comprises the following steps: acquiring equipment information and operation data of the wind power plant in real time based on a message bus; monitoring the grid-connected performance of the wind power plant in real time based on the equipment information and the operation data and a pre-constructed grid-connected performance evaluation system; the grid-connected performance evaluation system comprises: the method comprises the following steps of wind turbine generator grid connection performance evaluation, reactive compensation device grid connection performance evaluation and whole station grid connection performance evaluation. The on-line measurement and calculation is used for real-time monitoring, analysis and evaluation, the grid-connected performance is directly obtained, technical support is provided for real-time supervision and optimized operation of the full-life-cycle grid-connected operation characteristics of the wind power plant, and the method is simple, practical and easy to realize.

Description

Wind power plant grid-connected performance monitoring method and system

Technical Field

The invention belongs to the field of dynamic monitoring of power systems, and particularly relates to a method and a system for monitoring grid-connected performance of a wind power plant.

Background

In order to ensure safe and stable operation of a power system after large-scale wind power is connected into a power grid, the relevant wind power grid-connection standards in China put forward definite requirements on wind power plant grid-connection performance, including electric energy quality, active power control capability, reactive voltage control capability, low voltage ride through capability and the like. At present, the main means for evaluating the grid-connected performance of the wind power plant is combining field test with off-line simulation. The method is restricted by the operation condition of the power grid, the field test period is long, and data of partial working conditions, particularly strong wind working conditions, are difficult to obtain; partial parameters related to off-line simulation are difficult to measure or deduce, the overall simulation precision is influenced, and the simulation analysis period is long; the wind power plant operation adaptability, primary frequency modulation and other capabilities cannot be widely evaluated at present due to the limitation of models and test conditions; meanwhile, grid-connected evaluation is only carried out at the grid-connected stage of the wind power plant and cannot reflect the characteristics of the main equipment in the full life cycle; and the offline evaluation technology cannot comprehensively meet the important requirements of real-time monitoring and optimized scheduling of wind power grid-connected performance, accident analysis and anti-accident measure research.

Disclosure of Invention

The invention provides a wind power plant grid-connected performance monitoring method, which is used for overcoming the defects that the offline evaluation technology in the prior art can not fully meet the real-time monitoring and optimized scheduling of wind power grid-connected performance, the grid-connected evaluation is only carried out at the grid-connected stage of a wind power plant, and the characteristics of main equipment in the full life cycle can not be reflected, and is characterized by comprising the following steps:

acquiring equipment information and operation data of the wind power plant in real time based on a message bus;

monitoring the grid-connected performance of the wind power plant in real time based on the equipment information and the operation data and a pre-constructed grid-connected performance evaluation system;

the grid-connected performance evaluation system comprises: the method comprises the following steps of wind turbine generator grid connection performance evaluation, reactive compensation device grid connection performance evaluation and whole station grid connection performance evaluation.

Preferably, the acquiring information and operation data of the wind farm equipment in real time based on the message bus includes:

and acquiring real-time grid-connected operation data and wind power equipment information of all wind turbine generators, reactive compensation devices, wind power plant grid-connected points and power collection lines based on the message bus.

Preferably, the real-time evaluation of the grid-connected performance of the wind farm based on the device information, the operation data and a pre-constructed grid-connected performance evaluation system includes:

evaluating the grid-connected performance of the wind turbine generator based on the equipment information and the operation data acquired in real time;

evaluating the grid-connected performance of the reactive compensation device based on the equipment information and the operation data acquired in real time;

and evaluating the grid-connected performance of the whole station based on the equipment information and the operation data acquired in real time.

Preferably, the evaluating the grid-connected performance of the wind turbine includes:

based on the equipment information and the operation data acquired in real time, evaluating the steady-state operation performance of the wind turbine generator, evaluating the active power control capability of the wind turbine generator, evaluating the reactive power control capability of the wind turbine generator and evaluating the fault voltage ride-through capability of the wind turbine generator.

Preferably, the evaluating the steady-state operation performance of the wind turbine includes:

calculating the maximum value of active power and the maximum value of reactive power in a preset time period of the wind turbine generator, calculating the maximum value of active power and the maximum value of reactive power in each period by taking the preset time period as a period, synchronously recording the active power corresponding to the maximum value of reactive power, and if the active power and the reactive power meet the requirements of a local power grid dispatching department, determining that the steady-state operation performance of the wind turbine generator is qualified, otherwise, determining that the steady-state operation performance of the wind turbine generator is unqualified.

Preferably, the evaluating the active power control capability of the wind turbine includes:

calculating the difference between the maximum value and the minimum value of the active power of the wind turbine generator in a preset time period, calculating and judging whether the active power control response rate of the wind turbine generator in each period meets a preset condition I or not from the moment that the wind turbine generator receives an active power control instruction, if so, determining that the active power control capability of the wind turbine generator is qualified, and otherwise, determining that the active power control capability of the wind turbine generator is unqualified.

Preferably, the evaluating the reactive power control capability of the wind turbine includes:

and calculating the reactive power control response rate of the wind turbine generator and synchronously recording the active power of the wind turbine generator from the moment when the wind turbine generator receives the reactive power control instruction, and if the reactive power control response rate of the wind turbine generator meets a preset condition, determining that the reactive power control capability of the wind turbine generator is qualified, otherwise, determining that the reactive power control capability of the wind turbine generator is unqualified.

Preferably, the evaluating the fault voltage ride through capability of the wind turbine generator includes:

calculating the voltage drop/rise amplitude and the duration time of the fault, if the wind turbine generator is switched from the running state to the shutdown state, judging that the low-voltage/high-voltage protection action of the wind turbine generator is disconnected, otherwise, not disconnecting;

based on the active power recovery rate of the wind turbine generator set under the voltage drop fault and the reactive current injection response time and the average value of the wind turbine generator set under the voltage drop/rise fault, whether the absolute deviation of the active power recovery rate and the type test result meets the requirement that the absolute deviation does not exceed 10% is judged, whether the absolute deviation of the reactive current injection response time and the type test result meets the requirement that the absolute deviation does not exceed 10ms is judged, whether the absolute deviation of the reactive current injection average value and the type test result meets the requirement that the absolute deviation does not exceed 20% is judged, if yes, the fault voltage ride-through capability of the wind turbine generator set is qualified, and if not, the fault voltage ride-through.

Preferably, the evaluating the grid-connection performance of the reactive power compensation device includes:

and evaluating the steady-state operation performance of the reactive power compensation device, the reactive voltage control capability of the reactive power compensation device and the fault ride-through capability of the reactive power compensation device based on the equipment information and the operation data which are obtained in real time.

Preferably, the evaluating the steady-state operation performance of the reactive power compensation device includes:

calculating the maximum values of inductive and capacitive reactive power of the reactive power compensation device within a preset time period, and synchronously recording the voltage values of the reactive power compensation device connection points corresponding to the maximum values;

and calculating the absolute deviation of the converted output capacity and a rated value based on the fact that the reactive power compensation device achieves the upper limit locking of the output capacity, judging whether the absolute deviation value meets the requirement of not more than 5%, if so, determining that the steady-state operation performance of the reactive power compensation device is qualified, and otherwise, determining that the steady-state operation performance of the reactive power compensation device is unqualified.

Preferably, the evaluating the reactive voltage control capability of the reactive power compensation device includes:

calculating the reactive power response rate of the reactive power compensation device after the reactive power compensation device receives a voltage control command, and synchronously recording the average value of the voltage of a control point of the reactive power compensation device within a preset time period;

when voltage disturbance occurs at the device control point and exceeds a voltage dead zone, calculating the voltage control response rate and the dynamic response time of the device;

and judging whether the reactive power control response rate, the voltage control response rate and the dynamic response time of the reactive power compensation device meet a second preset condition, if so, determining that the reactive voltage control capability of the reactive power compensation device is qualified, and otherwise, determining that the reactive power control capability of the reactive power compensation device is unqualified.

Preferably, the evaluating the fault ride-through capability of the reactive power compensation device includes:

calculating the fault type, voltage drop/rise amplitude and duration of a control point of the reactive power compensation device;

when the voltage drop/rise fault occurs, the grid-connected switch of the reactive power compensation device is switched off from the closed state, and the reactive power compensation device is judged to be disconnected;

and calculating and judging whether the response time of the transient reactive current of the reactive compensation device, the absolute deviation of the adjusting time and the type test result meet the requirement that the response time and the absolute deviation of the adjusting time and the type test result do not exceed 10ms, and whether the absolute deviation of the reactive current adjusting proportional coefficient and the type test result meet the requirement that the absolute deviation and the absolute deviation do not exceed 0.1, if all the requirements are met, determining that the fault ride-through capability of the reactive compensation device is qualified, and if not, determining that.

Preferably, the evaluating the whole station grid-connected performance includes:

and based on the equipment information and the operation data acquired in real time, evaluating the active power control capability of the whole station, evaluating the primary frequency modulation capability of the whole station, evaluating the voltage reactive power control capability of the whole station, evaluating the fault voltage ride-through capability of the whole station and evaluating the power quality of the whole station.

Preferably, the evaluating the active power control capability of the whole station includes:

calculating and judging whether the active power change in the preset time period of the wind power plant meets a third preset condition;

calculating and judging whether the active power control response rate and the average absolute deviation of the wind power plant meet a preset condition four or not from the time when the wind power plant receives an AGC control instruction;

and if the third preset condition and the fourth preset condition are met, determining that the active power control capability of the whole station is qualified, otherwise, determining that the active power control capability of the whole station is unqualified.

Preferably, the evaluating the primary frequency modulation capability of the whole station includes:

and calculating and judging whether the starting time, the primary frequency modulation response time, the primary frequency modulation adjusting time and the primary frequency modulation active power adjusting deviation of the wind power plant all meet a third preset condition, if so, determining that the primary frequency modulation capability of the whole station is qualified, and otherwise, determining that the primary frequency modulation capability of the whole station is unqualified.

Preferably, the evaluating the voltage reactive power control capability of the whole station includes:

and calculating and judging whether the voltage control response time and the reactive power control response time of the wind power plant meet a fifth preset condition and a fourth preset condition, if so, determining that the voltage reactive power control capability of the whole station is qualified, and otherwise, determining that the voltage reactive power control capability of the whole station is unqualified.

Preferably, the evaluating the fault voltage ride-through capability of the whole station includes:

calculating the fault type and the voltage drop/rise amplitude and duration of a grid-connected point of the wind power plant;

when any wind turbine generator in the wind power plant stops working after the voltage drop/rise fault occurs, judging that the wind turbine generator in the wind power plant is disconnected at low voltage/high voltage;

and calculating and judging whether the active power recovery rate of the wind power plant, the reactive current injection response time and the average value of the wind power plant during the voltage dropping/rising all meet a third preset condition, if so, determining that the fault voltage ride-through capability of the whole station is qualified, and otherwise, determining that the fault voltage ride-through capability of the whole station is not qualified.

Preferably, the evaluating the quality of the power of the whole station includes:

calculating a long-time flicker limit value of a grid-connected point of the wind power plant according to a first preset condition, judging whether the flicker limit value meets a sixth preset condition, if so, determining that flicker caused by grid-connected operation of the whole station is qualified, otherwise, determining that flicker is unqualified;

calculating the limit value of each harmonic current injected into the wind power plant according to a preset condition I, and averaging the current harmonics of each phase of the wind power plant grid-connected point and the collecting line within a preset time period;

taking the maximum value of each phase measurement sequence in a preset time period as a harmonic measurement value, calculating and judging whether the maximum one-phase value in the 95% probability large values of the wind power plant harmonic three-phase comprehensive values in the 24h evaluation period meets the requirement that the maximum one-phase value is not more than the limit value of each subharmonic current injected by the wind power plant, whether the maximum three-phase comprehensive value meets the requirement that the maximum three-phase comprehensive value is not more than 1.5 times of the limit value of each subharmonic current injected by the wind power plant, if so, determining that each subharmonic current injected into the power system by the whole station grid-connected operation is qualified, and otherwise, determining that the.

Preferably, the calculation formula of the average value in the preset time period of the harmonic wave of each phase of the wind power plant grid-connected point and the collecting line is as follows:

in the formula of U_h，kIs the kth measurement of the h harmonic of a preset time period.

Preferably, the method for monitoring the grid-connected performance of the wind power plant further includes:

classifying and displaying the equipment information, the operation data and the real-time evaluation result of the grid-connected performance evaluation system which are acquired in real time on a human-computer interface;

wherein the classification presentation comprises: basic information, real-time data, a real-time curve, historical data, a historical curve, data reporting management and grid-connected performance indexes of wind power plant equipment.

Preferably, the method for monitoring the grid-connected performance of the wind power plant further includes: and automatically or manually reporting the classified and displayed data to a main station in a statistical form at regular time.

Based on the same conception, the invention provides a wind power plant grid-connected performance monitoring system, which comprises: the system comprises a data acquisition module and a monitoring module;

the data acquisition module is used for acquiring the information and the operation data of the wind power plant equipment in real time based on a message bus;

the monitoring module is used for monitoring the grid-connected performance of the wind power plant in real time based on the equipment information and the operation data and a pre-constructed grid-connected performance evaluation system;

the grid-connected performance evaluation system comprises: the method comprises the following steps of wind turbine generator grid connection performance evaluation, reactive compensation device grid connection performance evaluation and whole station grid connection performance evaluation.

Compared with the closest prior art, the invention has the following beneficial effects:

1. the invention provides a method for monitoring grid-connected performance of a wind power plant, which comprises the following steps: acquiring equipment information and operation data of the wind power plant in real time based on a message bus; monitoring the grid-connected performance of the wind power plant in real time based on the equipment information and the operation data and a pre-constructed grid-connected performance evaluation system; the grid-connected performance evaluation system comprises: the method comprises the following steps of wind turbine generator grid connection performance evaluation, reactive compensation device grid connection performance evaluation and whole station grid connection performance evaluation. Real-time monitoring, analyzing and evaluating are carried out through online measurement and calculation, the grid-connected performance is directly obtained, and technical support is provided for real-time supervision and optimized operation of the full-life-cycle grid-connected operation characteristics of the wind power plant;

2. the method and the system for monitoring the grid-connected performance of the wind power plant are simple, practical and easy to implement.

Drawings

FIG. 1 is a flow chart of a wind power plant grid-connected performance monitoring method provided by the invention;

fig. 2 is a system diagram of a wind farm grid-connected performance monitoring and evaluating system provided by the embodiment of the invention;

fig. 3 is a functional structure diagram of a wind farm grid-connected performance monitoring and evaluating system provided by the embodiment of the invention;

FIG. 4 is a schematic structural diagram of a visual human-machine interface provided in an embodiment of the present invention;

fig. 5 is a structural diagram of a wind farm grid-connected performance monitoring system provided by the invention.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Example 1:

fig. 1 shows a flowchart of a method for monitoring grid-connected performance of a wind farm provided by the present invention, which includes the following specific contents:

step 1: acquiring equipment information and operation data of the wind power plant in real time based on a message bus;

step 2: monitoring the grid-connected performance of the wind power plant in real time based on the equipment information and the operation data and a pre-constructed grid-connected performance evaluation system;

wherein, the step 1: acquiring equipment information and operation data of the wind power plant in real time based on a message bus:

the invention provides a wind power plant grid-connected performance monitoring method and system, which comprise a data acquisition module, a wind turbine generator grid-connected performance monitoring and evaluating module, a reactive compensation device grid-connected performance monitoring and evaluating module, a whole station grid-connected performance monitoring and evaluating module, a visual human-computer interface and the like.

1. The data acquisition module acquires the operation data and the equipment information of the wind power plant and outputs the data to the data reporting module.

The wind power plant grid-connected operation data and equipment information comprise:

(1) operating data

1) Three-phase voltage, three-phase current, generator rotating speed, wind direction and pitch angle of a cabin, direct current bus voltage of a converter and the like of the wind turbine generator set; active power and reactive power of the wind turbine generator; grid frequency, etc.; the active power and the reactive power of the wind turbine generator are controlled; active power and reactive power instructions of the wind turbine generator; a grid-connected switch state signal, a protection action state signal, fault alarm information and the like of the wind turbine generator;

2) three-phase voltage, three-phase current and voltage of each power module of the reactive power compensation device; reactive power and device control mode of the reactive power compensation device; a grid-connected switch signal, a protection action signal, fault alarm information and the like of the reactive power compensation device; the reactive power compensation device can adjust the reactive power capacity at present.

3) Three-phase voltage and three-phase current of a grid-connected point of the wind power plant, three-phase voltage of a bus of a collecting line and three-phase current of the collecting line; wind tower wind speed and wind direction measured by a wind power plant; active power and reactive power of the wind farm; collecting active power and reactive power of a circuit branch; grid frequency and frequency change rate of wind power plant grid-connected points; the method comprises the steps of AGC of the wind power plant, AVC control modes and control instructions, a wind power plant grid-connected point flicker value, a wind power plant grid-connected point and wind power plant collector line harmonic waves.

(2) Device information

1) The model of the wind turbine generator; the wind turbine generator system comprises a wind turbine generator main control system, a converter, a generator, blades and a variable pitch system model; wind turbine generator voltage, frequency protection fixed value and the like; the system comprises a main controller software version of the wind turbine generator, a converter controller software version, a variable pitch controller software version and the like.

2) The type and model of the reactive compensation device; a power module model; device transformer/reactor parameters; parallel capacitor/reactor parameters; the device control constant value comprises a voltage control range, a control dead zone and the like; device controller software version.

3) Rated capacity of the wind power plant, and the number of different types of wind generation sets of the wind power plant; electrical parameters of a main transformer of the wind power plant; collecting electrical parameters of the circuit; AGC model and software version of the wind power plant; wind farm AVC model, software version.

Step 2: and monitoring the grid-connected performance of the wind power plant in real time based on the equipment information and the operation data and a pre-constructed grid-connected performance evaluation system:

2. the wind turbine generator grid-connected performance monitoring and evaluating module reads time sequence real-time library data from the data acquisition module, detects and calculates a wind turbine generator grid-connected performance evaluation index in real time, and outputs the wind turbine generator grid-connected performance evaluation index to the data reporting module and the visual human-computer interface;

the wind turbine generator grid-connected performance evaluation indexes comprise four contents of steady-state operation performance, active power control capacity, reactive power regulation capacity, fault voltage ride-through capacity and the like.

Wherein the steady-state operation performance evaluation indexes comprise active power maximum values and reactive power maximum values of 10min, 60min and 24 h; the active power control capability evaluation indexes comprise active power change maximum values of 20s, 1min and 10min and wind generating set active power instruction control response rate; the reactive power regulation capability evaluation index is the response rate controlled by a reactive power instruction; the fault voltage ride-through capability evaluation indexes comprise whether the wind turbine generator is off-grid during the fault period, and whether the active power recovery rate, the reactive current injection response time and the average value of the wind turbine generator are consistent with the characteristics of a type test product.

The wind turbine generator grid-connected performance monitoring and evaluating submodule stores the wind turbine generator grid-connected performance evaluation indexes into a commercial base table in a recording mode, and the wind turbine generator grid-connected performance evaluation indexes are read and counted by taking a data reporting module and a visual human-computer interface as output ends.

3. The reactive compensation device grid-connected performance monitoring and evaluating module reads time sequence real-time library data from the data acquisition module, detects and calculates a reactive compensation device grid-connected performance evaluation index in real time, and outputs the reactive compensation device grid-connected performance evaluation index to the data reporting module and the visual human-computer interface;

the grid-connected performance evaluation indexes of the reactive compensation device comprise three contents of steady-state operation performance, reactive power regulation capability, fault voltage ride-through capability and the like of the reactive compensation device.

Wherein the steady-state operation performance evaluation indexes comprise maximum inductive reactive capacity and maximum capacitive reactive capacity of 10min, 60min and 24 h; the reactive power regulation capability evaluation index comprises reactive power control response rate, voltage control response rate and dynamic response time; the fault voltage ride through capability evaluation indexes comprise whether the reactive power compensation device is off-line or not during the fault period, and whether the response time, the adjusting time and the reactive current adjusting proportional coefficient of the transient reactive current of the reactive power compensation device are consistent with the characteristics of a type test product or not.

The reactive compensation device grid-connected performance monitoring and evaluating submodule stores the reactive compensation device grid-connected performance evaluation indexes into a commercial base table in a recording mode, and the reactive compensation device grid-connected performance evaluation indexes are read and counted by taking a visual human-computer interface as an output end.

4. And the whole station grid-connected performance monitoring and evaluating module reads the time sequence real-time database data from the data acquisition module, detects and calculates the whole station grid-connected performance index of the wind power plant in real time, and outputs the whole station grid-connected performance evaluation result to the data reporting module and the visual human-computer interface.

The whole station grid-connected performance evaluation indexes comprise five contents of active power control capacity, primary frequency modulation capacity, reactive voltage control capacity, fault voltage ride-through capacity, electric energy quality and the like of the wind power plant.

The active power control capacity evaluation indexes comprise active power change, wind power plant active power instruction control response rate and average absolute deviation; the primary frequency modulation capability evaluation indexes comprise primary frequency modulation starting time, primary frequency modulation response time, primary frequency modulation adjusting time and primary frequency modulation active power adjusting deviation; the reactive voltage control capability evaluation index comprises wind power plant grid-connected point voltage instruction control response time and reactive power instruction control response time; the fault voltage ride-through capability evaluation indexes comprise whether a wind power generator set in the wind power plant is disconnected during a fault period, the active power recovery rate of the wind power plant, and whether the reactive current injection response time and the average value of the wind power plant meet the requirements of GB/T19963; the electric energy quality evaluation indexes comprise long-time flicker, harmonic waves and inter-harmonic waves of continuous operation of the wind power plant.

And the whole station grid-connected performance monitoring and evaluating submodule stores the whole station grid-connected performance evaluation indexes into a commercial base table in a recording mode, and reads and counts the whole station grid-connected performance evaluation indexes by taking a visual human-computer interface as an output end.

Example 2:

the new energy grid-connected performance evaluation work is an important means for new energy grid-connected supervision. At present, the main means for evaluating the grid-connected performance of the wind power plant is combining field test with off-line simulation. The method is limited by the operation condition of a power grid, the field test period is long, data of partial working conditions, particularly the strong wind working conditions, are difficult to obtain, partial parameters related to off-line simulation are difficult to measure or deduce, the overall simulation precision is influenced, and meanwhile, grid-connected evaluation is only carried out at the grid-connected stage of the wind power plant and cannot reflect the characteristics of the main equipment in the full life cycle.

The invention provides a method and a system for monitoring and evaluating the grid-connected performance of a wind power plant, and provides technical support for supervision and optimized operation of the full-life-cycle grid-connected operation characteristic of the wind power plant.

Referring to fig. 2, the system diagram of the wind farm grid-connected performance monitoring and evaluating system provided by the invention comprises a data acquisition module, a wind farm grid-connected performance monitoring and evaluating module, a visual human-computer interface and the like.

1. The method comprises the steps that wind power plant operation data monitoring equipment or independent data acquisition equipment is configured through wind power plant operation data monitoring equipment such as a wind power plant main control system or monitoring system, a wind power plant reactive compensation device, a wind power plant measurement and control device, a wind power plant synchronous vector measurement unit, a wind power plant electric energy quality monitoring device, a wind power plant AGC substation and a wind power plant AVC substation, and the like, and the data acquisition module acquires grid-connected operation data such as a wind power plant, a reactive compensation device, a wind power plant grid-connected point, a current collection circuit and the like in a wind.

2. The functional structure diagram of the wind power plant grid-connected performance monitoring and evaluating system is shown in fig. 3 and comprises three functional modules, namely wind turbine generator grid-connected performance monitoring and evaluating, reactive compensation device grid-connected performance monitoring and evaluating and whole station grid-connected performance monitoring and evaluating. Wherein,

(1) a background computing unit of the wind turbine generator grid-connected performance monitoring and evaluating module reads time sequence real-time base data of the data acquisition module on line, analyzes and calculates grid-connected performance indexes such as steady-state operation performance, active power control capacity, reactive power regulation capacity and fault voltage ride-through capacity of the wind turbine generator, writes the grid-connected performance indexes into a commercial base table, and provides visual human-computer interface reading and displaying.

1) The method for calculating the steady-state operation performance evaluation index comprises the following steps:

a) under the state that the active power of the wind turbine generator is not limited, calculating the maximum active power values of the wind turbine generator for 10min, 60min and 24 h; the method for calculating the maximum value of the 10min active power comprises the following steps: within a time window of 10min, calculating the maximum value of the active power of the wind turbine generator every 1 s; the calculation methods of the maximum values of the active power are the same for 60min and 24 h;

b) and taking 10min, 60min and 24h as periods, calculating the maximum value of the reactive power of the wind turbine generator once every 1s, and synchronously recording the active power of the wind turbine generator corresponding to the maximum value.

2) The method for calculating the performance index of the active power control capability comprises the following steps:

a) calculating the maximum value of the active power change of the wind turbine generator for 20s, 1min and 10min under the state that the active power of the wind turbine generator is not limited; the method for calculating the maximum value of the active power change in 20s comprises the following steps: calculating the difference between the maximum value and the minimum value of the active power of the wind turbine generator every 0.2s within a time window of 20 s; the calculation methods of the maximum value of the active power change are the same in 1min and 10 min;

b) under the condition that the active power of the wind turbine generator is limited, calculating the active power control response rate of the wind turbine generator from the moment the wind turbine generator receives the active power control instruction, and judging whether the response rate meets the requirement of a preset condition, namely NB/T31078 wind power plant grid-connection performance evaluation method.

3) The reactive power control capability evaluation index calculation method comprises the following steps:

and calculating the reactive power control response rate of the wind turbine generator from the moment when the wind turbine generator receives the reactive power control instruction, and synchronously recording the active power of the wind turbine generator.

4) The fault voltage ride through capability evaluation index calculation method comprises the following steps:

a) and calculating the fault type, the voltage drop/rise amplitude and the duration of the wind turbine generator.

b) And judging whether the wind turbine generator is off-grid during the fault period. After a voltage drop/rise fault occurs, if the wind turbine generator is switched from an operating state to a shutdown state, it can be determined that the low-voltage/high-voltage protection action of the wind turbine generator is off-line.

c) And the wind turbine generator which keeps running during the fault period calculates the active power recovery rate of the wind turbine generator under the voltage drop fault, and calculates the reactive current injection response time and the average value of the wind turbine generator under the voltage drop/rise fault.

d) And calculating and judging whether the relative deviation between the active power recovery rate of the wind turbine generator and the type test result meets the requirement that the active power recovery rate of the wind turbine generator and the type test result is not more than 10%.

e) And calculating and judging whether the deviation of the reactive current injection response time and the average value of the wind turbine generator set and the type test result meets the requirement of not more than 10ms or not, and whether the deviation of the reactive current injection average value and the type test result meets the requirement of not more than 20% or not.

(2) A background computing unit of the reactive compensation device grid-connected performance monitoring and evaluating module reads time sequence real-time library data of the data acquisition module on line, analyzes and calculates grid-connected performance indexes such as steady-state operation performance, reactive voltage control capability, fault voltage ride-through capability and the like of the reactive compensation device, and writes the grid-connected performance indexes into a commercial library table for reading and displaying a visual human-computer interface.

1) The method for calculating the evaluation index of the steady-state operation performance comprises the following steps:

a) and under the constant voltage control mode, calculating the maximum values of the inductive and capacitive reactive powers of the reactive compensation device for 10min, 60min and 24 h.

b) The method for calculating the maximum value of the 10min reactive power comprises the following steps: within a time window of 10min, carrying out maximum value calculation of reactive power of the reactive power compensation device every 1s, and respectively recording inductive reactive power and capacitive reactive power; the maximum value calculation method of the reactive power is the same as that of the reactive power in 60min and 24 h;

c) in the process of calculating the maximum value of the reactive power, synchronously recording the voltage value of the connection point of the reactive power compensation device corresponding to the maximum value;

d) when the reactive power compensation device reaches the upper limit of the output capacity and is locked, the deviation between the output capacity after conversion and a rated value is calculated, and the deviation value is not more than 5%.

2) Reactive voltage control capability evaluation index calculation method

a) Under a constant voltage control mode, calculating the reactive power response rate of the reactive power compensation device from the moment when the reactive power compensation device receives a voltage control command, and synchronously recording the average value of 0.2s of the voltage of a control point of the reactive power compensation device;

b) under the constant reactive power control mode, starting from the reactive power control command received by the reactive power compensation device, calculating the reactive power response rate of the reactive power compensation device, and synchronously recording the average value of 0.2s of the voltage of the control point of the reactive power compensation device.

c) And under the constant voltage control mode, when the voltage disturbance occurs at the control point of the device and exceeds the voltage dead zone, calculating the dynamic response time of the device.

d) And judging whether the reactive power control response rate, the voltage control response rate and the dynamic response time of the reactive power compensation device meet the requirements of a preset condition II-energy industry standard, namely grid-connected performance test specification of the wind power plant dynamic reactive power compensation device.

3) The fault ride-through capability evaluation index calculation method comprises the following steps:

a) and calculating the fault type, voltage drop/rise amplitude and duration of the control point of the reactive compensation device.

b) And judging whether the reactive power compensation device is off-line or not during the fault. And after the voltage drop/rise fault occurs, if the grid-connected switch of the reactive power compensation device is switched from on to off, the reactive power compensation device is judged to be off-line.

c) And calculating the response time, the adjusting time and the reactive current adjusting proportionality coefficient of the transient reactive current of the reactive compensation device under the voltage fault.

d) And calculating and judging whether the response time and the adjustment time of the transient reactive current of the reactive compensation device and the deviation of the reactive current adjustment proportionality coefficient and the type test result meet the requirements or not, wherein the absolute deviation of the response time and the adjustment time of the reactive current and the type test result is not more than 10ms, and the absolute deviation of the reactive current adjustment proportionality coefficient and the type test result is not more than 0.1.

(3) A background computing unit of the whole station grid-connected performance monitoring and evaluating module reads time sequence real-time library data of the data acquisition module on line, analyzes and calculates grid-connected performance indexes such as active power control capability, primary frequency modulation capability, reactive voltage control capability, fault voltage ride-through capability, electric energy quality and the like of the whole station of the wind power plant, writes the grid-connected performance indexes into a commercial library table, and provides reading and displaying of a visual human-computer interface.

1) Active power control capability evaluation index calculation method

① active power variation

a) Calculating the active power change of the wind power plant at 1min and 10 min;

b) the 1min active power change calculation method comprises the following steps: within a time window of 1min, calculating the difference between the maximum value and the minimum value of the active power of the grid-connected point of the wind power plant every 0.2 s; the calculation method of the active power change is the same in 10 min;

c) and judging whether the active power change of the wind power plant at 1min and 10min meets the requirement of a preset condition of three GB/T19963 technical provision for accessing the wind power plant to the power system.

② active power command control capability

a) And under the active power controlled mode of the wind power plant, calculating the active power control response rate of the wind power plant from the time when the wind power plant receives an AGC control instruction.

b) Under the active power controlled mode of the wind power plant, receiving an AGC control instruction from the wind power plant, and controlling and keeping the deviation of the active power of the wind power plant at 3 percent P of installed capacity of the wind power plant_nAnd calculating the average absolute deviation of the active power control of the wind power plant from the time within the range until the wind power plant receives a new AGC control command.

c) And judging whether the active power control response rate and the average absolute deviation of the wind power plant meet the requirements of the preset condition four-energy industry standard technical requirements and test methods of the wind power plant power control system.

2) Primary frequency modulation capability

a) And under the wind power plant frequency control mode, calculating the power grid frequency and the wind power plant active power when the primary frequency modulation is started.

b) And calculating the primary frequency modulation starting time, the primary frequency modulation response time, the primary frequency modulation adjusting time and the primary frequency modulation active power adjusting deviation of the wind power plant.

c) And judging whether the primary frequency modulation starting time, the primary frequency modulation response time, the primary frequency modulation adjusting time and the primary frequency modulation active power adjusting deviation of the wind power plant all meet the requirements of a preset condition three GB/T19963 technical provision for accessing the wind power plant to the power system.

3) Voltage reactive power control capability evaluation index calculation method

a) And under the constant voltage control mode of the wind power plant, calculating the voltage control response time of the wind power plant, namely the time from the time when the wind power plant receives an AVC voltage control instruction to the time when the voltage of the wind power plant reaches and is kept in a control dead zone.

b) And under the constant reactive power control mode of the wind power plant, calculating the reactive power control response time of the wind power plant, namely the time from the wind power plant receiving the AVC reactive power control instruction to the wind power plant reaching and keeping the reactive power in the control dead zone.

c) And judging whether the voltage control response time and the reactive control response time of the wind power plant meet the requirements of a preset condition five NB/T31099 wind power plant reactive configuration and voltage control technical regulation and a preset condition four-energy industry standard wind power plant power control system technical requirement and test method.

4) Fault voltage ride-through capability evaluation index calculation method

a) And calculating the fault type and the voltage drop/rise amplitude and duration of the grid-connected point of the wind power plant.

b) And judging whether the wind turbine generator is off-grid during the fault period. After the voltage drop/rise fault occurs, if any wind turbine generator in the wind power plant stops working, the low-voltage/high-voltage off-line of the wind turbine generator in the wind power plant can be judged, and the model and the number of the off-line turbine generators are recorded.

c) And calculating and judging whether the active power recovery rate of the wind power plant meets the requirement of a preset condition three GB/T19963 technical provision for accessing the wind power plant to the power system.

d) And calculating and judging whether the reactive current injection response time and the average value of the wind power plant during the voltage dropping/rising meet the requirements of a preset condition three GB/T19963 technical provisions for accessing the wind power plant to the power system.

5) Power quality evaluation index calculation method

① flicker

a) And calculating the long-time flicker limit value of the grid-connected point of the wind power plant according to the provision of a preset condition NB/T31078 'wind power plant grid-connected performance evaluation method'.

b) The long-time flicker of the wind power plant meets the requirements of the preset condition of six GB/T12326 'power quality voltage fluctuation and flicker'.

② harmonics and inter-harmonics

a) Calculating the limit value of each harmonic current injected into the wind power plant according to the rule of a preset condition NB/T31078 & ltwind power plant grid connection performance evaluation method';

b) calculating the average value of the harmonic wave 3s of each phase of the wind power plant grid-connected point and the current collection line according to the formula (1):

in the formula: u shape_h，k-the kth measurement of the h harmonic within a 3s time window.

c) Taking the maximum value of each phase measurement sequence as a 10min harmonic measurement value U in a 10min time window_h.10minAnd taking 24h as an evaluation period to calculate U_h.10minThe 95% probability maximum of the measured sequence.

d) In the evaluation period of 24h, the maximum one-phase value in the 95% probability large values of the wind power plant harmonic wave comprehensive values should not be larger than the limit value of each subharmonic current injected by the wind power plant, and the maximum value of the three-phase comprehensive values should not be larger than 1.5 times of the limit value of each subharmonic current injected by the wind power plant.

3) The structural schematic diagram of the visual human-machine interface is shown in FIG. 4. The method comprises the steps of carrying out classification display on basic information, real-time data, real-time curves, historical data, historical curves and grid-connected performance indexes of a wind power generator set, a reactive compensation device and the whole station in the wind power plant through data reading, and regularly or manually reporting information such as grid-connected operation data, performance index data and the like of the wind power plant to a main station in a statistical report form through a data reporting management function.

Example 3:

based on the same inventive concept, the invention provides a wind power plant grid-connected performance monitoring system, the structure diagram of which as shown in fig. 5 comprises: the method comprises the following steps: the system comprises a data acquisition module and a monitoring module;

the data acquisition module is used for acquiring the information and the operation data of the wind power plant equipment in real time based on a message bus;

the monitoring module is used for monitoring the grid-connected performance of the wind power plant in real time based on the equipment information and the operation data and a pre-constructed grid-connected performance evaluation system;

the grid-connected performance evaluation system comprises: the method comprises the following steps of wind turbine generator grid connection performance evaluation, reactive compensation device grid connection performance evaluation and whole station grid connection performance evaluation.

Preferably, the data obtaining module includes: a real-time data submodule;

and the real-time data submodule is used for acquiring real-time grid-connected operation data and wind power equipment information of all the wind turbine generators, the reactive power compensation device, the wind power plant grid-connected point and the power collection line based on the message bus.

Preferably, the monitoring module includes: the system comprises a wind turbine generator submodule, a reactive compensation device submodule and an integral station submodule;

the wind turbine generator submodule is used for evaluating the grid-connected performance of the wind turbine generator based on the equipment information and the operation data which are obtained in real time;

the reactive compensation device submodule is used for evaluating the grid-connected performance of the reactive compensation device based on the equipment information and the operation data which are obtained in real time;

and the whole station submodule is used for evaluating the whole station grid-connected performance based on the equipment information and the operation data acquired in real time.

Preferably, the wind turbine submodule includes: a wind turbine generator evaluation unit;

and the wind turbine generator evaluation unit is used for evaluating the steady-state operation performance, the active power control capability, the reactive power control capability and the fault voltage ride-through capability of the wind turbine generator based on the equipment information and the operation data which are obtained in real time.

Preferably, the reactive compensation device submodule includes: a reactive power compensation device evaluation unit;

and the reactive power compensation device evaluation unit is used for evaluating the steady-state operation performance, the reactive voltage control capability and the fault ride-through capability of the reactive power compensation device based on the equipment information and the operation data which are acquired in real time.

Preferably, the whole station submodule includes: a whole station evaluation unit;

and the whole station evaluation unit is used for evaluating the active power control capability, the primary frequency modulation capability, the voltage reactive power control capability, the fault voltage ride-through capability and the electric energy quality of the whole station based on the equipment information and the operation data acquired in real time.

Preferably, the wind farm grid-connected performance monitoring system further includes: the display module and the submission module;

the display module is used for displaying the equipment information, the operation data and the real-time evaluation of the grid-connected performance evaluation system which are acquired in real time in a classification manner on a human-computer interface;

the reporting module is used for regularly and automatically or manually reporting the classified and displayed data to a main station in a statistical report form;

wherein the classification presentation comprises: basic information, real-time data, a real-time curve, historical data, a historical curve, data reporting management and grid-connected performance indexes of wind power plant equipment.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application and not for limiting the scope of protection thereof, and although the present application is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: numerous variations, modifications, and equivalents will occur to those skilled in the art upon reading the present application and are within the scope of the claims appended hereto.

Claims (22)

1. A wind power plant grid-connected performance monitoring method is characterized by comprising the following steps:

acquiring equipment information and operation data of the wind power plant in real time based on a message bus;

monitoring the grid-connected performance of the wind power plant in real time based on the equipment information and the operation data and a pre-constructed grid-connected performance evaluation system;

the grid-connected performance evaluation system comprises: the method comprises the following steps of wind turbine generator grid connection performance evaluation, reactive compensation device grid connection performance evaluation and whole station grid connection performance evaluation.

2. The wind farm grid-connected performance monitoring method according to claim 1, wherein the obtaining of wind farm equipment information and operation data in real time based on a message bus comprises:

and acquiring real-time grid-connected operation data and wind power equipment information of all wind turbine generators, reactive compensation devices, wind power plant grid-connected points and power collection lines based on the message bus.

3. The wind power plant grid-connected performance monitoring method according to claim 1, wherein the real-time evaluation of the wind power plant grid-connected performance based on the device information and the operation data and a pre-constructed grid-connected performance evaluation system comprises:

evaluating the grid-connected performance of the wind turbine generator based on the equipment information and the operation data acquired in real time;

evaluating the grid-connected performance of the reactive compensation device based on the equipment information and the operation data acquired in real time;

and evaluating the grid-connected performance of the whole station based on the equipment information and the operation data acquired in real time.

4. The wind power plant grid-connection performance monitoring method according to claim 3, wherein the evaluation of the wind turbine generator grid-connection performance comprises:

based on the equipment information and the operation data acquired in real time, evaluating the steady-state operation performance of the wind turbine generator, evaluating the active power control capability of the wind turbine generator, evaluating the reactive power control capability of the wind turbine generator and evaluating the fault voltage ride-through capability of the wind turbine generator.

5. The wind power plant grid-connected performance monitoring method according to claim 4, wherein the evaluation of the steady-state operation performance of the wind turbine generator comprises:

calculating the maximum value of active power and the maximum value of reactive power in a preset time period of the wind turbine generator, calculating the maximum value of active power and the maximum value of reactive power in each period by taking the preset time period as a period, synchronously recording the active power corresponding to the maximum value of reactive power, and if the active power and the reactive power meet the requirements of a local power grid dispatching department, determining that the steady-state operation performance of the wind turbine generator is qualified, otherwise, determining that the steady-state operation performance of the wind turbine generator is unqualified.

6. The wind power plant grid-connected performance monitoring method according to claim 4, wherein the evaluating the active power control capability of the wind turbine generator comprises:

calculating the difference between the maximum value and the minimum value of the active power of the wind turbine generator in a preset time period, calculating and judging whether the active power control response rate of the wind turbine generator in each period meets a preset condition I or not from the moment that the wind turbine generator receives an active power control instruction, if so, determining that the active power control capability of the wind turbine generator is qualified, and otherwise, determining that the active power control capability of the wind turbine generator is unqualified.

7. The wind farm grid-connected performance monitoring method according to claim 4, wherein the evaluating of the reactive power control capability of the wind turbine generator comprises:

and calculating the reactive power control response rate of the wind turbine generator and synchronously recording the active power of the wind turbine generator from the moment when the wind turbine generator receives the reactive power control instruction, and if the reactive power control response rate of the wind turbine generator meets a preset condition, determining that the reactive power control capability of the wind turbine generator is qualified, otherwise, determining that the reactive power control capability of the wind turbine generator is unqualified.

8. The wind power plant grid-connected performance monitoring method according to claim 4, wherein the evaluating of the fault voltage ride-through capability of the wind turbine generator comprises:

calculating the voltage drop/rise amplitude and the duration time of the fault, if the wind turbine generator is switched from the running state to the shutdown state, judging that the low-voltage/high-voltage protection action of the wind turbine generator is disconnected, otherwise, not disconnecting;

based on the active power recovery rate of the wind turbine generator set under the voltage drop fault and the reactive current injection response time and the average value of the wind turbine generator set under the voltage drop/rise fault, whether the absolute deviation of the active power recovery rate and the type test result meets the requirement that the absolute deviation does not exceed 10% is judged, whether the absolute deviation of the reactive current injection response time and the type test result meets the requirement that the absolute deviation does not exceed 10ms is judged, whether the absolute deviation of the reactive current injection average value and the type test result meets the requirement that the absolute deviation does not exceed 20% is judged, if yes, the fault voltage ride-through capability of the wind turbine generator set is qualified, and if not, the fault voltage ride-through.

9. The wind power plant grid-connected performance monitoring method according to claim 3, wherein the evaluating of the grid-connected performance of the reactive power compensation device comprises:

and evaluating the steady-state operation performance of the reactive power compensation device, the reactive voltage control capability of the reactive power compensation device and the fault ride-through capability of the reactive power compensation device based on the equipment information and the operation data which are obtained in real time.

10. The wind power plant grid-connected performance monitoring method according to claim 9, wherein the evaluating the steady-state operation performance of the reactive power compensation device comprises:

calculating the maximum values of inductive and capacitive reactive power of the reactive power compensation device within a preset time period, and synchronously recording the voltage values of the reactive power compensation device connection points corresponding to the maximum values;

and calculating the absolute deviation of the converted output capacity and a rated value based on the fact that the reactive power compensation device achieves the upper limit locking of the output capacity, judging whether the absolute deviation value meets the requirement of not more than 5%, if so, determining that the steady-state operation performance of the reactive power compensation device is qualified, and otherwise, determining that the steady-state operation performance of the reactive power compensation device is unqualified.

11. The wind farm grid-connected performance monitoring method according to claim 9, wherein the evaluating of the reactive voltage control capability of the reactive power compensation device comprises:

calculating the reactive power response rate of the reactive power compensation device after the reactive power compensation device receives a voltage control command, and synchronously recording the average value of the voltage of a control point of the reactive power compensation device within a preset time period;

when voltage disturbance occurs at the device control point and exceeds a voltage dead zone, calculating the voltage control response rate and the dynamic response time of the device;

and judging whether the reactive power control response rate, the voltage control response rate and the dynamic response time of the reactive power compensation device meet a second preset condition, if so, determining that the reactive voltage control capability of the reactive power compensation device is qualified, and otherwise, determining that the reactive power control capability of the reactive power compensation device is unqualified.

12. The wind farm grid-connected performance monitoring method according to claim 9, wherein the evaluating of the fault ride-through capability of the reactive power compensation device comprises:

calculating the fault type, voltage drop/rise amplitude and duration of a control point of the reactive power compensation device;

when the voltage drop/rise fault occurs, the grid-connected switch of the reactive power compensation device is switched off from the closed state, and the reactive power compensation device is judged to be disconnected;

and calculating and judging whether the response time of the transient reactive current of the reactive compensation device, the absolute deviation of the adjusting time and the type test result meet the requirement that the response time and the absolute deviation of the adjusting time and the type test result do not exceed 10ms, and whether the absolute deviation of the reactive current adjusting proportional coefficient and the type test result meet the requirement that the absolute deviation and the absolute deviation do not exceed 0.1, if all the requirements are met, determining that the fault ride-through capability of the reactive compensation device is qualified, and if not, determining that.

13. The wind power plant grid-connected performance monitoring method according to claim 3, wherein the evaluation of the whole plant grid-connected performance comprises:

and based on the equipment information and the operation data acquired in real time, evaluating the active power control capability of the whole station, evaluating the primary frequency modulation capability of the whole station, evaluating the voltage reactive power control capability of the whole station, evaluating the fault voltage ride-through capability of the whole station and evaluating the power quality of the whole station.

14. The method for monitoring the grid-connected performance of the wind power plant according to claim 13, wherein the step of evaluating the active power control capability of the whole plant comprises the following steps:

calculating and judging whether the active power change in the preset time period of the wind power plant meets a third preset condition;

calculating and judging whether the active power control response rate and the average absolute deviation of the wind power plant meet a preset condition four or not from the time when the wind power plant receives an AGC control instruction;

and if the third preset condition and the fourth preset condition are met, determining that the active power control capability of the whole station is qualified, otherwise, determining that the active power control capability of the whole station is unqualified.

15. The wind power plant grid-connected performance monitoring method according to claim 13, wherein the evaluation of the primary frequency modulation capability of the whole station comprises:

and calculating and judging whether the starting time, the primary frequency modulation response time, the primary frequency modulation adjusting time and the primary frequency modulation active power adjusting deviation of the wind power plant all meet a third preset condition, if so, determining that the primary frequency modulation capability of the whole station is qualified, and otherwise, determining that the primary frequency modulation capability of the whole station is unqualified.

16. The wind power plant grid-connected performance monitoring method according to claim 13, wherein the evaluating of the voltage reactive power control capability of the whole plant comprises:

and calculating and judging whether the voltage control response time and the reactive power control response time of the wind power plant meet a fifth preset condition and a fourth preset condition, if so, determining that the voltage reactive power control capability of the whole station is qualified, and otherwise, determining that the voltage reactive power control capability of the whole station is unqualified.

17. The wind power plant grid-connected performance monitoring method according to claim 13, wherein the evaluating of the fault voltage ride-through capability of the whole plant comprises:

calculating the fault type and the voltage drop/rise amplitude and duration of a grid-connected point of the wind power plant;

when any wind turbine generator in the wind power plant stops working after the voltage drop/rise fault occurs, judging that the wind turbine generator in the wind power plant is disconnected at low voltage/high voltage;

and calculating and judging whether the active power recovery rate of the wind power plant, the reactive current injection response time and the average value of the wind power plant during the voltage dropping/rising all meet a third preset condition, if so, determining that the fault voltage ride-through capability of the whole station is qualified, and otherwise, determining that the fault voltage ride-through capability of the whole station is not qualified.

18. The wind power plant grid-connected performance monitoring method according to claim 13, wherein the evaluating of the power quality of the whole station comprises:

calculating a long-time flicker limit value of a grid-connected point of the wind power plant according to a first preset condition, judging whether the flicker limit value meets a sixth preset condition, if so, determining that flicker caused by grid-connected operation of the whole station is qualified, otherwise, determining that flicker is unqualified;

calculating the limit value of each harmonic current injected into the wind power plant according to a preset condition I, and averaging the current harmonics of each phase of the wind power plant grid-connected point and the collecting line within a preset time period;

taking the maximum value of each phase measurement sequence in a preset time period as a harmonic measurement value, calculating and judging whether the maximum one-phase value in the 95% probability large values of the wind power plant harmonic three-phase comprehensive values in the 24h evaluation period meets the requirement that the maximum one-phase value is not more than the limit value of each subharmonic current injected by the wind power plant, whether the maximum three-phase comprehensive value meets the requirement that the maximum three-phase comprehensive value is not more than 1.5 times of the limit value of each subharmonic current injected by the wind power plant, if so, determining that each subharmonic current injected into the power system by the whole station grid-connected operation is qualified, and otherwise, determining that the.

19. The method for monitoring the grid-connected performance of the wind power plant according to claim 18, wherein the calculation formula of the average value in the preset time period of the harmonic wave of each phase of the current of the grid-connected point and the current collecting line of the wind power plant is as follows:

in the formula of U_h.kIs the kth measurement of the h harmonic of a preset time period.

20. The wind power plant grid-connected performance monitoring method according to claim 1, characterized by further comprising:

classifying and displaying the equipment information, the operation data and the real-time evaluation result of the grid-connected performance evaluation system which are acquired in real time on a human-computer interface;

wherein the classification presentation comprises: basic information, real-time data, a real-time curve, historical data, a historical curve, data reporting management and grid-connected performance indexes of wind power plant equipment.

21. The wind farm grid-connected performance monitoring method according to claim 20, further comprising: and automatically or manually reporting the classified and displayed data to a main station in a statistical form at regular time.

22. A wind power plant grid-connected performance monitoring system is characterized by comprising: the system comprises a data acquisition module and a monitoring module;

the data acquisition module is used for acquiring the information and the operation data of the wind power plant equipment in real time based on a message bus;

the monitoring module is used for monitoring the grid-connected performance of the wind power plant in real time based on the equipment information and the operation data and a pre-constructed grid-connected performance evaluation system;

the grid-connected performance evaluation system comprises: the method comprises the following steps of wind turbine generator grid connection performance evaluation, reactive compensation device grid connection performance evaluation and whole station grid connection performance evaluation.

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