CN104579165A - Photovoltaic power station dynamic reactive response performance site testing method - Google Patents

Abstract

The invention relates to an on-site testing method for the dynamic reactive power response performance of a photovoltaic power station. The test point is selected at the grid connection point of the photovoltaic power station; the voltage change of the busbar in the photovoltaic power station is realized by adjusting the tap of the main transformer; the method is: measuring The output of active power and reactive power of the photovoltaic power station; confirm the detection device; adjust the taps of the on-load transformer so that the voltage of the grid-connected point should meet the voltage deviation requirements; record the output active power of the current power station whose illuminance is kept at 400 watts/square meter as P ₀ ; Set the photovoltaic power station to work in the terminal voltage control mode; adjust the taps of the on-load transformer to observe the reactive power action of the power station; analyze the test results and calculate the dynamic response performance index of the photovoltaic power station. The invention solves the problems of limited capacity of the test device and too complicated modeling and testing methods when measuring the dynamic reactive power response of the photovoltaic power station, and improves the current test method system of the station-level reactive power response capability of the photovoltaic power station.

Description

A Field Test Method for Dynamic Reactive Power Response Performance of Photovoltaic Power Plant

Technical field:

The invention relates to an on-site test method for the dynamic reactive power response performance of a photovoltaic power station, and more particularly to an on-site test method for the dynamic reactive power response performance of a photovoltaic power station by utilizing the coordination and cooperation of a station-level on-load tap changer and a power station AVC system.

Background technique:

When the grid-connected point voltage of the photovoltaic power station is greatly disturbed and the voltage amplitude drops to 90% U _n ~ 0% U _n , the photovoltaic inverter needs to have low voltage ride-through capability, and it is hoped that the photovoltaic power station can quickly respond to reactive power and compensate The corresponding reactive current realizes the voltage support capability of the grid-connected point. At present, domestic and foreign standards have made regulations on the dynamic reactive power response during low voltage ride through. Under normal operating conditions, due to the influence of fluctuations and instability of solar radiation intensity, the output power of photovoltaic power plants fluctuates greatly. With the increase of the access capacity of photovoltaic power stations, the phenomenon of line voltage exceeding the limit caused by output power fluctuations is gradually intensified. It is hoped that photovoltaic power stations have the ability to regulate voltage with conventional capabilities and maintain the stability of grid-connected point voltage.

In addition to the centrally installed static reactive power compensation device or dynamic reactive power compensation device in the photovoltaic power station, the photovoltaic inverter also has reactive power adjustment capabilities. The block diagram of the reactive power control system of a photovoltaic power station is shown in Figure 1, which can usually be divided into a reactive power setting layer and a reactive power distribution layer. Among them, the upper layer (setting layer) calculates the reactive power demand of the photovoltaic power station by the grid according to the low-voltage side deviation setting of the grid-connected point, and verifies the reactive power demand set according to the operating constraints of the photovoltaic power station, and finally gives a reasonable reactive power demand value , in addition, it can also directly accept the reactive power adjustment command issued by the dispatcher; the lower layer (allocation layer) distributes the reactive power demand value calculated by the upper layer according to the operating constraints and actual operating status of the photovoltaic power generation unit according to a certain allocation principle , output after verification as the reactive power adjustment target command of the photovoltaic power generation unit. Therefore, the configuration of reactive power compensation at the plant level is relatively complicated, and it is necessary to formulate detailed testing conditions and testing methods for reactive power support capacity to correctly reflect the real reactive power support capacity of photovoltaic power plants.

GB/T 29321-2012 "Technical Regulations on Reactive Power Compensation of Photovoltaic Power Stations" defines the dynamic reactive power response time of photovoltaic power stations, that is, the response time of PV station dynamic reactive power (response time of PV station dynamic reactive power) refers to the From the time when the voltage at the grid-connected point of the power station rises or falls abnormally and reaches the trigger set value, until the actual output variation of reactive power at the grid-connected point of the photovoltaic power station (the difference between the target value and the initial value) reaches 90% of the target value of the variation time. It is required that the reactive power source of the photovoltaic power station should be able to track the fluctuation of photovoltaic output and respond quickly to meet the voltage regulation requirements. It is stipulated that the dynamic reactive power response time of the photovoltaic power station should not be greater than 30ms.

The test of dynamic reactive power requires an abnormal increase or decrease in the voltage of the grid-connected point as the experimental condition. Since the capacity of the test device is much smaller than that of a large-scale photovoltaic power station, the test site cannot simulate the large disturbance condition of the power grid. The dynamic reactive current is evaluated during the voltage ride-through period, but the implementation steps of this method are complicated, and the accuracy of the evaluation results depends on the technical level of the evaluation institution. Under normal operating conditions, when the voltage fluctuation range is within 10% U _n , a simple and easy-to-operate test method is needed to evaluate the dynamic reactive power response performance of the photovoltaic power station and correctly reflect the real dynamic reactive power support capability of the photovoltaic power station .

Invention content:

The purpose of the present invention is to provide a field test method for the dynamic reactive power response performance of a photovoltaic power station. The method solves the problems of limited capacity of the test device and too complicated modeling and testing methods when measuring the dynamic reactive power response of a photovoltaic power station. At present, there is a test method system for the reactive power response capability of photovoltaic power stations at the station level.

In order to achieve the above object, the present invention adopts the following technical solutions: a field test method for the dynamic reactive power response performance of a photovoltaic power station, which includes a reactive power compensation device and a photovoltaic inverter; the test point is selected in the photovoltaic power station At the grid connection point; the bus voltage change in the photovoltaic power station is realized by adjusting the tap of the main transformer; the method includes the following steps:

(1) Measure the active power output and reactive power output of the photovoltaic power station; confirm that the detection device is synchronized with the control room;

(2) Adjust the taps of the on-load transformer so that the grid-connected point voltage should meet the voltage deviation requirements of GB/T 12325;

(3) The output active power of the current power station whose illuminance is maintained at 400 watts/square meter for the record test is P ₀ ;

(4) Set the photovoltaic power station to work in the terminal voltage control mode;

(5) Adjust the taps of the on-load transformer and observe the reactive action of the power station;

(6) After the test is over, save the data;

(7) Analyze the test results and calculate the dynamic response performance index of the photovoltaic power station.

The present invention provides an on-site testing method for dynamic reactive power response performance of a photovoltaic power station. The step (1) measures the active power output and reactive power output of the photovoltaic power station by connecting a power detection device to the secondary side of the photovoltaic power station.

The present invention provides an on-site testing method for the dynamic reactive power response performance of a photovoltaic power station, respectively checking whether the voltage, current, active power and reactive power of the power quality analyzer and the power analyzer are consistent with the control room of the power station; checking the power Check whether the time of the device is synchronized with that of the control room of the power station.

Another preferred on-site testing method of the dynamic reactive power response performance of the photovoltaic power plant provided by the present invention, the step (2) adjusts the tap of the transformer to the middle position.

Another preferred field test method for the dynamic reactive power response performance of a photovoltaic power station provided by the present invention is to connect a photovoltaic power station with a voltage level of 10kV or 6kV to the public power grid, and the voltage deviation of the grid-connected point is the nominal voltage of the corresponding power system ±7% of

By connecting the 35kV~110kV voltage level to the photovoltaic power station of the public grid, the voltage deviation of the grid connection point is -3%~+7% of the nominal voltage of the corresponding power system; the recovery voltage after the accident is ±10% of the nominal voltage of the power system %;

By connecting the 220kV voltage level to the photovoltaic power station of the public grid, the voltage deviation of the grid-connected point is 0%~+10% of the nominal voltage of the corresponding power system; the recovery voltage after the accident is -5%~+ of the nominal voltage of the power system 10%;

By connecting photovoltaic power stations with a voltage level of 330kV and above to the public grid, under normal operation, the maximum operating voltage of the grid-connected point shall not exceed +110% of the nominal voltage of the power system; the minimum operating voltage does not affect the synchronous stability of the power system, voltage Stability, normal use of factory power and adjustment of the next level of voltage.

Another preferred on-site testing method of the dynamic reactive power response performance of a photovoltaic power station provided by the present invention, in the test in the step (3), does not limit the reactive power change speed of the photovoltaic power station; The compensation device is in normal operation, and the output reactive power of all photovoltaic inverters is close to zero.

Another preferred on-site testing method for the dynamic reactive power response performance of a photovoltaic power station provided by the present invention, the step (4) sets the photovoltaic power station to work in the terminal voltage control mode through the AVC system of the power station, and defines the upper and lower limits of the action threshold ± U%, that is, when the absolute value of the actual voltage deviation |ΔU%|>±|U%|, the AVC system will regulate the voltage until |ΔU%|<±|U%|. During the experiment, generally set voltage action threshold ±U%<(2~4)×voltage regulation step size U _tap %. Wherein, the voltage regulation step length U _tap % is the percentage of voltage change after the on-load tap transformer changes one stage. After the voltage crosses the limit, it sends out the reverse maximum reactive power Q _max to suppress the voltage fluctuation.

Another preferred field test method for the dynamic reactive power response performance of a photovoltaic power station provided by the present invention, in the step (5), adjust the taps of the on-load transformer according to the voltage regulation curve of the photovoltaic power station, and gradually increase the grid-connected point voltage Disturb the voltage of the grid-connected point of the power station, and after observing the reactive power action of the power station, restore the tap of the on-load tap changer to the initial middle position of the experiment; gradually reduce the voltage of the grid-connected point to disturb the voltage of the grid-connected point of the power station, and observe the reactive power action of the power station After that, restore the tap to the middle position at the beginning of the experiment.

Another preferred on-site testing method for the dynamic reactive power response performance of a photovoltaic power station provided by the present invention, the test in the step (6) is completed, the position of the voltage tap is restored, the photovoltaic power station returns to the normal operating state, the instrument test data is saved, and the Instrument wiring.

Another preferred on-site test method for the dynamic reactive power response performance of a photovoltaic power station provided by the present invention, the indicators in the step (7) include: when the photovoltaic power station sends inductive reactive power, the dynamic reactive current establishment time Δt _1L , dynamic reactive current response time Δt _2L ; when the photovoltaic power station emits capacitive reactive power, dynamic reactive current establishment time Δt _1C , dynamic reactive current response time Δt _2C , inductive reactive power response value and capacitance Reactive power response value

Another preferred field test method for dynamic reactive power response performance of photovoltaic power plants provided by the present invention:

The dynamic reactive current establishment time Δt _1L is determined by the following formula:

Δt _1L = |t _1L -t _0L | (1)

Among them, t _1L is the moment when the absolute value of the voltage change exceeds 10% of the adjustment target value, which is recorded as the start time of voltage change; t _0L is the time when the reactive current reaches 90% of the steady-state value, which is recorded as the end time of the response;

The dynamic reactive current establishment time Δt _1C is determined by the following formula:

Δt _1C ＝ |t _1C -t _0C | (2)

Among them, t _1C is the moment when the absolute value of the voltage change exceeds 10% of the adjustment target value, which is recorded as the start time of voltage change; t _0C is the time when the reactive current reaches 90% of the steady-state value, which is recorded as the end time of the response;

The dynamic reactive current response time Δt _2L is determined by the following formula:

Δt _2L = |t _2L -t _0L | (3)

Among them, t _2L is the moment when the absolute value of the voltage change exceeds the adjustment target value by 10%, which is recorded as the starting time of the voltage change;

The dynamic reactive current response time Δt _2C is determined by the following formula:

Δt _2C ＝ |t _2C -t _0C | (4)

Among them, _t2C is the moment when the absolute value of the voltage change exceeds the adjustment target value by 10%, which is recorded as the starting time of the voltage change;

The inductive or capacitive reactive power response value is the ratio of the reactive power output value Q of the power station to the AVC set target value Qset after reaching a steady state.

Compared with the closest prior art, the technical solution provided by the present invention has the following excellent effects

1. The method of the present invention realizes the voltage fluctuation at the outlet side of the power station by using the tap adjustment of the station-level OLTC and the adjustment of the AVC response threshold of the power station;

2. The method of the present invention monitors the centralized reactive power compensation of the power station and the dynamic reactive power response capability of the inverter and evaluates it according to the standard;

3. The method of the present invention solves the problems of limited capacity of the test device and too complicated modeling and testing methods during the measurement of the dynamic reactive power response of the photovoltaic power station;

4. The method of the present invention improves the current method system for testing the reactive power response capability of the photovoltaic power station.

Description of drawings

Fig. 1 is the block diagram of reactive power control system of photovoltaic power plant of the present invention;

Fig. 2 is a dynamic reactive power test point diagram of a photovoltaic power station of the present invention;

Fig. 3 is the curve diagram of the voltage regulation of the photovoltaic power plant of the present invention;

Fig. 4 is the schematic diagram of reactive power dynamic response judging method of the present invention;

Fig. 5 is a centralized access type 30MW voltage and reactive current variation trend diagram of the present invention;

Fig. 6 is a centralized access type 30MW voltage and reactive current variation trend diagram of the present invention;

Fig. 7 is a certain centralized access type 30MW active power of the present invention, reactive power response characteristic figure;

Fig. 8 is a diagram of effective values of dynamic voltage and reactive current of a centralized access type 30MW capacitive device according to the present invention.

Detailed ways

Below in conjunction with embodiment the invention is described in further detail.

Example 1:

As shown in Figure 1-8, the invention of this example provides an on-site test method for the dynamic reactive power response performance of photovoltaic power plants; The pressure range is ±N level, and the pressure regulation step is U _tap %.

The test method steps are as follows

(1) According to Figure 2, connect the power detection device on the secondary side of the power station to measure the active power output and reactive power output of the power station; check the voltage, current, active power and reactive power of the power quality analyzer and power analyzer Whether it is consistent with the control room of the power station; check whether the time of the power detection device is synchronized with the control room of the power station.

(2) Adjust the on-load transformer taps, and adjust the transformer taps to the middle position. At this time, the grid-connected point voltage should meet the voltage deviation requirements of GB/T 12325:

For photovoltaic power stations connected to the public grid through a 10(6)kV voltage level, the voltage deviation of the grid-connected point is ±7% of the nominal voltage of the corresponding system.

For photovoltaic power stations connected to the public grid through a voltage level of 35kV to 110kV, the voltage deviation of the grid connection point is -3% to +7% of the nominal voltage of the corresponding system; the recovery voltage after the accident is ±10% of the nominal voltage of the system.

For photovoltaic power stations that are connected to the public grid through a 220kV voltage level, the voltage deviation of the grid-connected point is 0% to +10% of the nominal voltage of the corresponding system; the recovery voltage after the accident is -5% to +10% of the nominal voltage of the system.

For photovoltaic power stations that are connected to the public grid through a voltage level of 330kV and above, under normal operation, the maximum operating voltage of the grid-connected point shall not exceed +110% of the system's nominal voltage; the minimum operating voltage shall not affect the synchronous stability and voltage stability of the power system , The normal use of factory power and the regulation of the next level of voltage.

(3) The illuminance should be kept above 400W/ ^m2 during the test; record the current output active power of the power station as P ₀ ; do not limit the reactive power change speed of the photovoltaic power station; ensure that the centralized reactive power compensation device is in normal operation, and all inverters The output reactive power of the converter is close to 0.

(4) Set the photovoltaic power station to work in the terminal voltage control mode through the AVC system of the power station, the voltage action threshold is ±U%<(2~4)×U _tap %, and the reverse maximum reactive power Q _max is issued after the voltage exceeds the limit. suppress voltage fluctuations;

(5) According to the voltage curve shown in Figure 3, adjust the taps of the on-load transformer, and gradually increase the voltage of the grid-connected point to disturb the voltage of the grid-connected point of the power station. The initial intermediate position; the voltage of the grid-connected point is lowered step by step to disturb the voltage of the grid-connected point of the power station. After observing the reactive power action of the power station, restore the tap to the initial intermediate position of the experiment.

(6) After the test, the position of the voltage tap is restored, the power station returns to normal operation, the test data of the instrument is saved, and the wiring of the instrument is removed.

(7) Analyze the test results and calculate the dynamic response performance index of the photovoltaic power station: when sending inductive reactive power, the dynamic reactive current establishment time Δt _1L , and the dynamic reactive current response time Δt _2L ; when sending capacitive reactive power, the dynamic reactive current Establishment time Δt _1C , dynamic reactive current response time Δt _2C , inductive reactive power response value, and capacitive reactive power response value.

The dynamic reactive current establishment time Δt _1L is determined by the following formula:

Δt _1L = |t _1L -t _0L | (1)

Among them, t _1L is the moment when the absolute value of the voltage change exceeds 10% of the adjustment target value, which is recorded as the start time of voltage change; t _0L is the time when the reactive current reaches 90% of the steady-state value, which is recorded as the end time of the response;

The dynamic reactive current establishment time Δt _1C is determined by the following formula:

Δt _1C ＝ |t _1C -t _0C | (2)

Among them, t _1C is the moment when the absolute value of the voltage change exceeds 10% of the adjustment target value, which is recorded as the start time of voltage change; t _0C is the time when the reactive current reaches 90% of the steady-state value, which is recorded as the end time of the response;

The dynamic reactive current response time Δt _2L is determined by the following formula:

Δt _2L = |t _2L -t _0L | (3)

Among them, t _2L is the moment when the absolute value of the voltage change exceeds the adjustment target value by 10%, which is recorded as the starting time of the voltage change;

The dynamic reactive current response time Δt _2C is determined by the following formula:

Δt _2C ＝ |t _2C -t _0C | (4)

Among them, _t2C is the moment when the absolute value of the voltage change exceeds the adjustment target value by 10%, which is recorded as the starting time of the voltage change;

The inductive/capacitive reactive power response value is the ratio of the reactive power output value Q of the power station after reaching a steady state and the AVC set target value Q _set .

In Figure 4, Iq ₁ is the initial operating value of the reactive current of the photovoltaic power station; Iq ₂ is the dynamic response amplitude of the reactive current of the photovoltaic power station; Iq is the dynamic reactive current response amplitude of the photovoltaic power station;

In order to analyze the impact of different time lengths on the distribution of test results, the following is an example of a centralized access 30MW dynamic reactive power test result. The test results of inductive dynamic reactive power are shown in Figure 5-6, and the set value of inductive reactive power is 8Mvar.

After calculation, the performance index of inductive reactive power response is shown in Table 1:

Table 1 Power change trend of power station after voltage recovery

Capacitive dynamic reactive power test results are shown in Figure 8, and the set value of inductive reactive power is 4Mvar. After calculation, the capacitive reactive power response performance index is shown in Table 1:

Table 2 Power change trend of power station after voltage recovery

According to the method described in the application, the dynamic reactive power test results of the power station are as follows:

When the power station sends inductive reactive power, the dynamic reactive current establishment time Δt1L of the power station is 40ms, and the dynamic reactive current dynamic response time Δt2L is 1920ms; when the power station sends capacitive reactive power, the dynamic reactive current establishment time Δt1C is 90ms, The dynamic reactive current dynamic response time Δt2C is 2520ms. The response value of inductive reactive power is 93% Q _set , and the response value of capacitive reactive power is 67.2% Q _set .

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Those of ordinary skill in the art should understand with reference to the above embodiments that the specific implementation methods of the present invention can still be modified or equivalent. Replacement, any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention are within the protection scope of the claims of the present invention pending application.

Claims (11)

1. an on-the-spot test method for photovoltaic plant dynamic reactive response performance, described photovoltaic plant comprises reactive power compensator and photovoltaic DC-to-AC converter; It is characterized in that: its test point is selected in photovoltaic electric station grid connection point place; In described photovoltaic plant, busbar voltage change realizes by regulating main transformer tap; Said method comprising the steps of:

(1) measure described photovoltaic plant active power to export and reactive power output; Confirm that checkout gear is synchronous with control room;

(2) adjustment has a year transformer tapping, makes grid-connected point voltage should meet the requirement of GB/T 12325 voltage deviation;

(3) record test illumination remains on the current plant active power of output of 400 watts/square metre is P ₀;

(4) under setting photovoltaic plant is operated in terminal voltage control mode;

(5) adjustment has a year transformer tapping, observes the idle action in power station;

(6) test terminates, and preserves data;

(7) analytical test result, calculates photovoltaic plant dynamic response performance index.

2. the on-the-spot test method of a kind of photovoltaic plant dynamic reactive response performance as claimed in claim 1, it is characterized in that: described step (1), by described photovoltaic plant secondary side access power checkout gear, is measured power station active power and exported and reactive power output.

3. the on-the-spot test method of a kind of photovoltaic plant dynamic reactive response performance as claimed in claim 2, is characterized in that: check that whether the voltage of power quality analyzer and power analyzer, electric current, active power is consistent with Control of Power Plant room with reactive power respectively; Check whether the time of described power detection device keeps synchronous with Control of Power Plant room.

4. the on-the-spot test method of a kind of photovoltaic plant dynamic reactive response performance as claimed in claim 1, is characterized in that: transformer tapping is adjusted to centre position by described step (2).

5. the on-the-spot test method of a kind of photovoltaic plant dynamic reactive response performance as claimed in claim 4,

It is characterized in that: by the photo-voltaic power generation station of 10kV or 6kV electric pressure access public electric wire net, it also

Site voltage deviation be corresponding electric power system nominal voltage ± 7%;

By by 35kV ~ 110kV electric pressure access public electric wire net photo-voltaic power generation station, its grid-connected point voltage deviation be corresponding electric power system nominal voltage ?3% ~+7%; After accident recovery voltage be electric power system nominal voltage ± 10%;

By the photo-voltaic power generation station by 220kV electric pressure access public electric wire net, its grid-connected point voltage deviation is 0% ~+10% of corresponding electric power system nominal voltage; After accident recovery voltage be electric power system nominal voltage ?5% ~+10%;

By the photo-voltaic power generation station by 330kV and above access public electric wire net, under normal operating mode, itself and site highest operating voltage must not exceed+110% of electric power system nominal voltage; Minimum operation voltage does not affect electric power system synchronism stability, voltage stabilization, the normal use of station service and the adjustment of next stage voltage.

6. the on-the-spot test method of a kind of photovoltaic plant dynamic reactive response performance as claimed in claim 1, is characterized in that: in the test in described step (3), does not limit the reactive power pace of change of photo-voltaic power generation station; Guarantee that concentrated reactive power compensator is in normal operating condition, the output reactive power of all photovoltaic DC-to-AC converters is close to 0.

7. the on-the-spot test method of a kind of photovoltaic plant dynamic reactive response performance as claimed in claim 1, it is characterized in that: under described step (4) is operated in terminal voltage control mode by power station AVC default photovoltaic plant, voltage operation threshold value is ± U%< (2 ~ 4) × step-length voltage regulating U _tap%, sends reverse maximum reactive power Q after voltage crosses the border _max, suppress voltage fluctuation.

8. the on-the-spot test method of a kind of photovoltaic plant dynamic reactive response performance as claimed in claim 1, it is characterized in that: according to the voltage regulation curve of photovoltaic plant in described step (5), adjustment has carries transformer tapping, raise grid-connected point voltage step by step and disturbance is carried out to electric station grid connection point voltage, after observing the idle action in power station, recover on-load tap-changing transformer tap to testing initial centre position; Reducing grid-connected point voltage step by step and disturbance is carried out to electric station grid connection point voltage, after observing the idle action in power station, recovering tap to testing initial centre position.

9. the on-the-spot test method of a kind of photovoltaic plant dynamic reactive response performance as claimed in claim 1, it is characterized in that: in described step (6), test terminates, recovery voltage tap position, and photovoltaic plant recovers normal operating condition, preserve instrument test data, remove instrument wiring.

10. the on-the-spot test method of a kind of photovoltaic plant dynamic reactive response performance as claimed in claim 1, it is characterized in that: the index in described step (7) comprises: when described photovoltaic plant sends lagging reactive power, dynamic reactive electric current Δ settling time t _1L, dynamic reactive current response time Δ t _2L; When described photovoltaic plant sends capacitive reactive power, dynamic reactive electric current Δ settling time t _1C, dynamic reactive current response time Δ t _2C, lagging reactive power response and capacitive reactive power response.

The on-the-spot test method of 11. a kind of photovoltaic plant dynamic reactive response performances as claimed in claim 10, is characterized in that:

Described dynamic reactive electric current Δ settling time t _1Ldetermined by following formula:

Δt _1L＝|t _1L-t _0L| (1)

Wherein, t _1Lfor change in voltage absolute value exceedes adjustment aim value 10% moment, be designated as change in voltage initial time; t _0Lfor reactive current arrives steady-state value 90% moment, be designated as response finish time;

Described dynamic reactive electric current Δ settling time t _1Cdetermined by following formula:

Δt _1C＝|t _1C-t _0C| (2)

Wherein, t _1Cfor change in voltage absolute value exceedes adjustment aim value 10% moment, be designated as change in voltage initial time; t _0Cfor reactive current arrives steady-state value 90% moment, be designated as response finish time;

Described dynamic reactive current response time Δ t _2Ldetermined by following formula:

Δt _2L＝|t _2L-t _0L| (3)

Wherein, t _2Lfor change in voltage absolute value exceedes adjustment aim value 10% moment, be designated as change in voltage initial time;

Described dynamic reactive current response time Δ t _2Cdetermined by following formula:

Δt _2C＝|t _2C-t _0C| (4)

Wherein, t _2Cfor change in voltage absolute value exceedes adjustment aim value 10% moment, be designated as change in voltage initial time;

Perception or capacitive reactive power response are the ratio reaching the idle output valve Q in power station and AVC target setting value Qset after stable state.