CN107465213B - A kind of power station AVC system and its idle real-time regulated quantity calculation method - Google Patents

Abstract

The present invention relates to a kind of power station AVC system and its idle real-time regulated quantity calculation methods, this programme passes through series of features value, complicated relationship between the parameters such as reactive power, busbar voltage in simplified power station, and it establishes starter/generator and increases idle power output, high-voltage side bus increase reactive compensation power, or after one grade of sub-connecting switch of transformer position is raised and lowered, to the model for the variable quantity that the parameters such as high low pressure side bus voltage, power station output reactive power generate.In the operation of power station AVC system for field, which can be introduced into AVC system as internal algorithm, and auxiliary AVC system quickly and accurately formulates reactive compensation switching strategy, to produce a kind of new power station AVC system.New AVC system can satisfy the quick governing response time requirement of voltage and reactive power, maintain the voltage in power station and reactive power in acceptability limit at any time, improve the power quality of power station output.

Description

A kind of AVC system of power station and its reactive power real-time adjusting quantity calculation method

technical field

The invention relates to an AVC system of a power station and a method for calculating a reactive power real-time adjustment amount thereof, belonging to the technical field of electric power.

Background technique

When the power system is in normal operation, the power flow and voltage level of the power grid should be controlled through preventive control, so as to maintain the stable operation of the power angle of the power grid and have the necessary stability reserves. According to the principle of layering, partitioning and local balance, the reactive power of the system is reasonably adjusted through preventive control, the system voltage is maintained in a stable operating range, and an appropriate reactive power reserve is maintained to ensure that the system is under normal disturbance or a large load due to some reason. The voltage is stable when changing, reducing the probability of dynamic stability control device action.

In the power grid, the automatic reactive voltage control system (AVC) of the factory and station is generally used to maintain the bus voltage within the specified range and have the necessary voltage stability margin. The AVC system is divided into grid AVC and plant AVC. Power grid AVC is divided into two types according to its control mode: centralized control and distributed control. Both of them take the minimum network loss as the optimization goal, and use the optimal power flow algorithm to calculate the optimal reactive power compensation at each node in the power grid. The plant AVC is divided into the power plant (station) AVC and the substation (station) AVC, and they aim to maintain the bus voltage in the plant and the station and the power factor of the transmission line within the acceptable range. The power grid AVC is located in the dispatching room and serves as the AVC main station; the power station AVC is located in the power station and substation and serves as the AVC substation. The two often cooperate with each other as a whole to jointly maintain the voltage quality and reactive power flow of the power grid.

The AVC of the power station can be used as an AVC sub-station to accept dispatching commands from the AVC master station; it can also operate independently to maintain the voltage and power factor in the designated power station within the acceptable range. There are four types of response parameters for voltage and reactive power regulation in traditional power station AVC products, namely: bus voltage increment and output reactive power increment caused by inputting unit reactive power, and bus voltage increment caused by step-up transformer tap adjustment. Voltage increment and output reactive power increment. These parameters are dynamic values that are closely related to parameters such as the actual power generated by the generator, the actual voltage of the high and low voltage side buses, and the reactive voltage characteristics of the transmission line, and their calculation methods are complex. Therefore, in the actual AVC products of power stations, the values of these parameters are generally configured by engineering personnel through experience or actual measurement. Connector position. AVC products that calculate voltage and reactive power adjustments and formulate control strategies based on static configuration parameters cannot adapt to all operating conditions of power stations, resulting in AVC products that are prone to frequent adjustments, long adjustment processes, and even oscillation adjustments. The adjustment speed and Control accuracy is often difficult to meet the requirements of distributed power stations connected to the power system.

Contents of the invention

The purpose of the present invention is to provide a power station AVC system and its reactive power real-time adjustment calculation method, in order to solve the existing technology in the power station AVC system in the adjustment process of voltage and power factor. Long and prone to oscillation adjustment phenomenon.

To achieve the above object, the solution of the present invention includes:

A method for calculating the dynamic response parameters of the generator of the AVC system of a PQ node power station for increasing reactive power output of the present invention includes the following method scheme for increasing the reactive power output of the PQ node:

Method 1 for increasing reactive power output at PQ nodes, collecting the gear position n of the current tap changer of the transformer in the power station, the average value U 1 of the three-phase bus line voltage on the low-voltage side of the transformer, and the average U ₁ of the three-phase bus line voltage on the high-voltage side of the transformer _2. The total active power P ₁ output by the generator, the total reactive power Q ₁ output by the generator, the total active power P ₂ output by the high-voltage bus to the grid, and the total reactive power Q output by the high-voltage bus to the grid ₂ ;

Calculating the dynamic response parameters of the generator increasing the reactive output, the dynamic response parameters of the generator increasing the reactive output include: the increase of the unit reactive output of the generator causes the low-voltage side bus voltage increment to be

Among them, K _qu,c =K _qu,l K _uu,t -K _qu,t , K _qq,c1 =K _qq,t -K _qu,l K _uq,t , Z _T ² =X _T ² +R _T ² ,

Among them, X _L is the reactance of the equivalent transmission line between the power station and the large power grid, R _T is the branch resistance of the transformer to the low-voltage side, X _T is the branch reactance of the transformer to the low-voltage side, and B _T is The susceptance to ground of the transformer attributed to the low-voltage side, U _1e is the rated voltage of the low-voltage side of the transformer, U _2e is the rated voltage of the high-voltage side of the transformer, and _δu % is the step voltage of the transformer; The percentage value of the adjustment range.

Method scheme 2 for increasing reactive power output at PQ nodes. On the basis of scheme 1 for increasing reactive power output at PQ nodes, the dynamic response parameters for increasing reactive power output of the generator also include: The bus voltage increment is where K _qq,c2 =K _qq,t K _uu,t −K _qu,t K _uq,t .

The third method for increasing reactive output at PQ nodes, based on the first method for increasing reactive output at PQ nodes, the dynamic response parameters for increasing reactive output of the generator also include: The increment of output reactive power is where K _qq,c2 =K _qq,t K _uu,t −K _qu,t K _uq,t .

A method for calculating the dynamic response parameters of reactive power compensation at the high-voltage side of the AVC system of a PQ node power station of the present invention includes the following method scheme for reactive power compensation of the PQ node:

Method 1 of PQ node reactive power compensation:

Collect the gear position n of the current tap changer of the transformer in the power station, the average value U ₁ of the three-phase bus line voltage on the low-voltage side of the transformer, the average value U ₂ of the three-phase bus line voltage on the high-voltage side of the transformer, and the total active power P output by the generator _1. The total reactive power Q ₁ output by the generator, the total active power P ₂ output by the high-voltage bus to the grid, and the total reactive power Q ₂ output by the high-voltage bus to the grid;

Calculating the dynamic response parameters of reactive power compensation on the high voltage side, the dynamic response parameters of reactive power compensation on the high voltage side include: the input unit reactive power at the high voltage side causes the bus voltage increment at the low voltage side to be

Among them, K _qu,c = K _qu,l K _uu,t -K _qu,t , Z _T ² =X _T ² +R _T ² ,

Among them, X _L is the reactance of the equivalent transmission line between the power station and the large power grid, R _T is the branch resistance of the transformer to the low-voltage side, X _T is the branch reactance of the transformer to the low-voltage side, and B _T is The susceptance to ground of the transformer attributed to the low-voltage side, U _1e is the rated voltage of the low-voltage side of the transformer, U _2e is the rated voltage of the high-voltage side of the transformer, and _δu % is the step voltage of the transformer; The percentage value of the adjustment range.

Method 2 of PQ node reactive power compensation, on the basis of PQ node reactive power compensation method 1, the dynamic response parameters of reactive power compensation at the high voltage side also include: inputting unit reactive power at the high voltage side causes the bus voltage increase at the high voltage side The amount is

PQ node reactive power compensation method scheme three, on the basis of PQ node reactive power compensation method scheme one, the dynamic response parameters of the high-voltage side reactive power compensation also include: the input of unit reactive power at the high-voltage side causes the power station to output reactive power The power increment is

A method for calculating the dynamic response parameters of the transformer tap changer adjustment of the AVC system of the PQ node power station of the present invention includes the following method scheme for PQ node transformer adjustment:

Method 1 for PQ node transformer regulation:

Collect the gear position n of the current tap changer of the transformer in the power station, the average value U ₁ of the three-phase bus line voltage on the low-voltage side of the transformer, the average value U ₂ of the three-phase bus line voltage on the high-voltage side of the transformer, and the total active power P output by the generator _1. The total reactive power Q ₁ output by the generator, the total active power P ₂ output by the high-voltage bus to the grid, and the total reactive power Q ₂ output by the high-voltage bus to the grid;

Calculating the dynamic response parameters of the transformer tap changer adjustment, the dynamic response parameters of the transformer tap changer adjustment include: the increase of the transformer tap changer by one level causes the voltage increment of the low-voltage side busbar to be When the transformer tap-changer is lowered by one gear, the voltage increment of the bus bar on the low-voltage side is

where K _qu,c = K _qu,l K _uu,t -K _qu,t , Z _T ² =X _T ² +R _T ² ,

Among them, X _L is the reactance of the equivalent transmission line between the power station and the large power grid, R _T is the branch resistance of the transformer to the low-voltage side, X _T is the branch reactance of the transformer to the low-voltage side, and B _T is The susceptance to ground of the transformer attributed to the low-voltage side, U _1e is the rated voltage of the low-voltage side of the transformer, U _2e is the rated voltage of the high-voltage side of the transformer, and _δu % is the step voltage of the transformer; The percentage value of the adjustment range.

Method scheme two for PQ node transformer regulation, on the basis of method scheme one for PQ node transformer regulation, the dynamic response parameters of the transformer tap changer adjustment also include: the voltage increase of the high-voltage side busbar caused by the transformer tap changer being raised by one gear for When the tap changer of the transformer is lowered by one gear, the voltage increment of the bus bar on the high voltage side is

Method scheme three for PQ node transformer regulation, on the basis of method scheme one for PQ node transformer regulation, the dynamic response parameters of the transformer tap changer adjustment also include: the step-up of the transformer tap changer causes the power station to output reactive power increments of When the transformer tap-changer is lowered by one gear, the output reactive power increment of the power station is

A method for calculating the dynamic response parameters of reactive power compensation at the high-voltage side of the AVC system of a PV node power station according to the present invention includes the following method scheme for reactive power compensation of PV nodes:

Method 1 of PV node reactive power compensation:

Collect the gear n of the current tap-changer of the transformer in the power station, the average value U ₁ of the three-phase bus line voltage on the low-voltage side of the transformer, the average value U ₂ of the three-phase bus line voltage on the high-voltage side of the transformer, and the total reactive power output by the generator Q ₁ , the total active power P ₂ output by the high-voltage bus to the grid, and the total reactive power Q ₂ output by the high-voltage bus to the grid;

Calculating the dynamic response parameters of reactive power compensation at the high voltage side, the dynamic response parameters of reactive power compensation at the high voltage side include: the input unit reactive power at the high voltage side causes the increase of the bus voltage at the high voltage side to be

Among them, K _qq,c1 =K _qq,t -K _qu,l ·K _uq,t , Z _T ² =X _T ² +R _T ² ,

Among them, X _L is the reactance of the equivalent transmission line between the power station and the large power grid, R _T is the branch resistance of the transformer to the low-voltage side, X _T is the branch reactance of the transformer to the low-voltage side, and U _1e is The rated voltage of the low-voltage side of the transformer, U _2e is the rated voltage of the high-voltage side of the transformer, and _δu % is the step voltage of the transformer; the step voltage is the percentage value of the adjustment range of each gear of the transformer tap changer.

The second method of reactive power compensation at PV nodes, based on the first method of reactive power compensation at PV nodes, the dynamic response parameters of reactive power compensation at the high-voltage side also include: inputting unit reactive power at the high-voltage side causes the power station to output reactive power The power increment is

The present invention relates to a calculation method for adjusting dynamic response parameters of a transformer tap changer in an AVC system of a PV node power station, comprising the following method for adjusting a PV node transformer:

Method 1 for PV node transformer regulation:

Collect the gear n of the current tap-changer of the transformer in the power station, the average value U ₁ of the three-phase bus line voltage on the low-voltage side of the transformer, the average value U ₂ of the three-phase bus line voltage on the high-voltage side of the transformer, and the total reactive power output by the generator Q ₁ , the total active power P ₂ output by the high-voltage bus to the grid, and the total reactive power Q ₂ output by the high-voltage bus to the grid;

Calculating the dynamic response parameters of the transformer tap changer adjustment, the dynamic response parameters of the transformer tap changer adjustment include: the increment of the high voltage side bus voltage caused by the transformer tap changer being raised by one gear is When the transformer tap-changer is lowered by one gear, the increment of the bus voltage on the high-voltage side is

Among them, K _qq,c1 =K _qq,t -K _qu,l ·K _uq,t , Z _T ² =X _T ² +R _T ² ,

Among them, X _L is the reactance of the equivalent transmission line between the power station and the large power grid, R _T is the branch resistance of the transformer to the low-voltage side, X _T is the branch reactance of the transformer to the low-voltage side, and U _1e is The rated voltage of the low-voltage side of the transformer, U _2e is the rated voltage of the high-voltage side of the transformer, and _δu % is the step voltage of the transformer; the step voltage is the percentage value of the adjustment range of each gear of the transformer tap changer.

Method scheme 2 for PV node transformer regulation. On the basis of method scheme 1 for PV node transformer regulation, the dynamic response parameters of the transformer tap changer adjustment also include: the step-up of the transformer tap changer causes the power station to output reactive power increments of When the transformer tap-changer is lowered by one gear, the output reactive power increment of the power station is

An AVC system of a power station according to the present invention includes an acquisition module and a processor. The acquisition module is used to acquire the gear n of the current tap changer of the transformer in the power station, the average value U ₁ of the three-phase bus line voltage on the low-voltage side of the transformer, The average U ₂ of the three-phase bus voltage on the high-voltage side of the transformer, the total active power P ₁ output by the generator, the total reactive power Q ₁ output by the generator, the total active power P ₂ output by the high-voltage side bus to the grid, The total reactive power _Q2 output by the high-voltage side busbar to the power grid; the processor is used to implement the method schemes 1, 2 and 3 for increasing the reactive power output of the PQ node; the method scheme 1, scheme 2, and scheme 3 for the PQ node reactive power compensation Scheme 3; method scheme 1, scheme 2 and scheme 3 for PQ node transformer adjustment; method scheme 1 and scheme 2 for PV node reactive power compensation; calculation method for any one of scheme 1 and scheme 2 for PV node transformer adjustment method.

The beneficial effects of the present invention are:

By setting a series of eigenvalues, this program simplifies the intricate relationship between reactive power regulation, bus voltage and other parameters in power stations into several models that only contain eigenvalues of unit reactive power regulation and cause changes in bus voltage. Efficiently and quickly obtain the influence of corresponding reactive power adjustment on voltage; when this model is introduced into the adjustment strategy of AVC system power factor, it can assist the AVC system to perform adjustment actions reasonably, thus creating a new AVC system for power stations. The new AVC system can greatly reduce the rounds and time of control strategy execution, improve the work efficiency and automation of the system, and at the same time improve the accuracy of system adjustment and improve power quality.

Description of drawings

Figure 1 is a power flow circuit diagram for power station operation;

Figure 2 is a circuit diagram of the dynamic response of voltage and reactive power of the power station.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

The invention provides calculation formulas for dynamic response parameters of voltage and reactive power of power stations, and researches a new AVC product of power stations using these calculation formulas as internal algorithms. Applicable to various power stations and step-up substations.

For an ordinary power station, the power flowing through the generator, step-up transformer, busbar, shunt capacitor bank and transmission line can be represented by an equivalent circuit diagram, as shown in Figure 1.

U ₁ , U ₂ , U ₃ , U′ ₂ --respectively, the generator bus voltage, the main transformer high-voltage side bus voltage, the equivalent transmission line end bus voltage, and the voltage converted from the ideal transformer to the low-voltage side in the main transformer model.

R _L , X _L , and B _C are the resistance (Ω), reactance (Ω), and ground susceptance (S) of the equivalent transmission line, respectively.

R _T , X _T , G _T , B _T --respectively, the branch resistance and reactance (Ω), ground conductance and susceptance (S) of the step-up transformer attributed to the low-voltage side. in, S _e is the rated capacity of the transformer (MVA); U _1e is the rated voltage of the low-voltage side (kV); P _d is the short-circuit loss (kW); P ₀ is the no-load loss (kW); U _d % is the percentage of impedance voltage Value; I ₀ % is the percentage value of no-load current.

K _T is the transformation ratio of the transformer, U _2e is the rated voltage of the high voltage side (kV); n is the current gear of the transformer tap; δ _u % is the stage voltage.

1) Voltage and reactive power response characteristics of transmission lines

For power stations, the voltage at the end of the transmission line for

in, Therefore there are

Considering that the change of voltage amplitude has little effect on the change of active power, let P2 remain unchanged, and the _two sides of the above formula are differentiated for the voltage and reactive power parameters (use dU and dQ to represent the voltage micro-increment and reactive power micro-increment respectively amount), get:

Since the change of the reactive power at the head end of the transmission line has little effect on the change of the bus voltage at the end, it can be assumed that dU ₃ =0. Considering that B _c X _L <<1, we get

Simplifying the above formula, the reactive voltage response equation of the transmission line is obtained:

2) Reactive power response characteristics of step-up transformers

The reactive power loss flowing through the step-up transformer of a power station is mainly composed of the following two parts:

Therefore, the reactive power flowing out of the high voltage side of the transformer is

consider can be simplified to get

Similarly, the active power flowing out of the high voltage side of the transformer is

Assuming that the voltage increments of the low and high voltage sides of the transformer are dU ₁ and dU ₂ respectively, the increments of the input reactive power at the low voltage side and the output reactive power at the high voltage side are ΔQ ₁ and ΔQ ₂ respectively, and the differential of both ends of formula (8) is calculated, The reactive power response equation of the step-up transformer is obtained

3) Voltage response characteristics of the step-up transformer

In Figure 1, the voltage relationship across the transformer is

Among them, Q′ ₁ ＝Q ₁ -B _T U ₁ ² , substitute into the above formula; and considering X _T B _T <<1, we get

According to the above formula and formula (8~9), we can get

Equation (13) can be used to test or correct the impedance parameter value of the main transformer of the power station.

Assume that the voltage increments of the low and high voltage sides of the transformer are dU ₁ and dU ₂ respectively, and the reactive power increment of the input transformer low voltage side is ΔQ ₁ ; the adjustment direction of the transformer tap is parameter Differentiate both ends of formula (11) (where K _T is a dynamic parameter), and consider R _T B _T <<1, the voltage response equation of the step-up transformer can be obtained

4) Dynamic response characteristics of power station voltage and reactive power

In summary, let

Among them, P ₂ , Q ₂ , and U ₂ are respectively obtained by formula (8), formula (9), and formula (12); combined formula (5), formula (10), and formula (14), the overall power station can be obtained The dynamic response equations of voltage and reactive power are as follows:

The voltage and reactive power micro-increments of the power station are represented on the circuit diagram, as shown in Figure 2 (the bus voltage, reactive power and transformer ratio in the figure only show their changes).

The calculation method of the dynamic response parameters of the voltage and reactive power of the power station will be described in detail below in conjunction with the circuit diagram in Figure 2, and it will be applied to a new AVC product of the power station.

Different power stations have different functions of generators. Generator nodes are generally divided into three types: one is a buffer node that serves as a reference for the entire network voltage and adjusts active and reactive power, that is, a balance node; the other is a voltage source, that is, a PV node; and the third is a power source, that is, a PQ node. node. The power station of the balance node generally maintains its voltage stability and active and reactive power output automatically by the control device of the generator itself, and does not need external application software product control; the power station of the latter two types of nodes can be controlled by the external application software product. Active and reactive output. For power stations with PQ type nodes, the present invention will analyze the calculation formula of the corresponding voltage and reactive dynamic response parameters for the following three situations: a) the generator increases (or reduces) the reactive power output; b) the high-voltage side bus complements ( or cutting off) capacitive reactive power; c) the transformer tap is raised (or lowered) by one gear. For power stations with PV type nodes, the present invention will analyze the calculation formulas of the corresponding dynamic response parameters of voltage and reactive power for the two cases (b and c).

(1) Calculation of voltage and reactive power dynamic response parameters of PQ node power station

It can be seen from Fig. 2 that the reactive power increment ΔQ ₁ input to the low-voltage side of the transformer is equal to the reactive power increment dQ ₁ sent by the generator; assuming that the capacitive reactive power increment supplemented by the busbar reactive power compensation device on the high-voltage side is dQ _C2 , then The increment of output reactive power at the high voltage side of the transformer is ΔQ ₂ =dQ ₂ -dQ _C2 . Substituting them into equations (16), we get

In the above formula

The parameter K _qu,c represents the capacitive reactive power that needs to be compensated by the high-voltage side busbar when the generator busbar is raised to a unit voltage.

From the formula (17), the calculation formula of the dynamic response parameters of the voltage and reactive power of each busbar of the PQ node power station can be obtained, and the list is as follows:

Table 1. Calculation formula of voltage and reactive power response parameters of PQ node power station

(2) Calculation of voltage and reactive power dynamic response parameters of PV node power station

When the generator node is a PV node, the voltage of the generator bus remains unchanged, and dU ₁ =0, which can be substituted into equation (17) to obtain

From the formula (19), the calculation formula of the dynamic response parameters of the voltage and reactive power of each bus in the power station can be obtained, and the list is as follows:

Table 2. Calculation formula of voltage and reactive power response parameters of PV node power station

(3) A new automatic reactive power and voltage control system (AVC) for power stations

The voltage and reactive power response parameter of the power station is not a static value, but a parameter related to the current operating state of the power grid (such as the actual voltage of the high and low voltage side buses, the actual power flowing through the transformer, the voltage and reactive power response characteristics of the transmission line, etc. ) are closely related dynamic values. Therefore, a fixed parameter value cannot be used to characterize the voltage and reactive power response characteristics of the power station. In fact, for the same voltage and reactive power response parameter of a power station, under different operating conditions, the parameter value may differ several times or even more than ten times.

The application software of the traditional reactive power and voltage automatic control system (AVC) of the power station adopts to configure the fixed value of the control system according to the relatively large voltage and reactive power response parameter value. Its purpose is to adjust a small amount of reactive power each time, and finally make the power quality of the power station meet the needs of the grid through multiple adjustments. Its disadvantages: First, there are many adjustment times and a long adjustment process, which cannot meet the requirements of quickly reaching the qualified voltage quality; second, under certain specific operating conditions, oscillation adjustment may occur, causing the voltage value to fluctuate back and forth on both sides outside the qualified range. , there is a need for methods to detect oscillatory regulation and measures to terminate oscillatory regulation.

The present invention uses the calculation formula of the dynamic response parameter of voltage and reactive power of the power station as an internal core algorithm, directly applies it to the automatic control system of reactive power and voltage of the power station, and develops a new AVC software product of the power station. New AVC products do not need to configure fixed voltage and reactive power response parameters. When the voltage or power factor of the power station deviates from the qualified range, the new AVC product will use the calculation formula of the present invention to calculate the voltage and reactive power response value of the power station in the current operating state in real time, so as to obtain the adjustment amount required by the power grid. And select an optimal control plan to implement, to achieve the requirements of quickly and accurately formulating control strategies. Without considering the maximum allowable adjustment amount for each action, the new AVC product can make the voltage and power factor of the power station reach the acceptable range through 1 or 2 adjustment actions to meet the rapid adjustment requirements. Since it is dynamically calculated according to the current operating state and dynamically obtains the adjustment amount, it can well avoid the phenomenon of oscillation adjustment.

Aiming at the defects of many times of adjustment, long adjustment process and easy occurrence of vibration regulation in the products of the traditional reactive power and voltage automatic control system (AVC) of the power station, the present invention utilizes the electrical connection relationship between the primary equipment in the power station and the power flow flowing through each Based on the power loss and voltage loss theory generated after the equipment, the calculation formulas of the four types of voltage and reactive power regulation response parameters in the power station are derived, and a new power station AVC product that uses these calculation formulas as an internal algorithm is developed. The new AVC product is suitable for various power stations and step-up substations, and it does not need to configure fixed voltage and reactive power response parameters; when the voltage or power factor of the power station deviates from the qualified range, the new AVC product can calculate the current operating status of the power station in real time The response value of the voltage and reactive power under the condition can be calculated to calculate the reactive power or the adjustment amount of the tap gear that needs to be compensated by the power grid, and quickly and accurately issue the control strategy. The actual power station engineering application proves that the new AVC product can quickly restore the power station from the abnormal voltage and reactive power state to the normal state, so as to deliver more stable and high-quality electric energy to the grid.

Claims (14)

1. A method for calculating a dynamic response parameter of a generator added reactive power output of an AVC system of a PQ node power station is characterized by comprising the following steps:

acquiring gear n of the current tap switch of the transformer of the power station and the average value U of the three-phase bus line voltage at the low-voltage side of the transformer₁Average value U of three-phase bus line voltage on high-voltage side of transformer₂Total active power P output by the generator₁Total reactive power Q output by the generator₁And the total active power P output to the power grid by the high-voltage side bus₂High, highTotal reactive power Q output to power grid by voltage side bus₂；

Calculating a generator added reactive power output dynamic response parameter, wherein the generator added reactive power output dynamic response parameter comprises: the voltage increment of the low-voltage side bus caused by the increase of unit reactive power output of the generator is

Wherein, K_qu,c＝K_qu,lK_uu,t-K_qu,t，K_qq,c1＝K_qq,t-K_qu,lK_uq,t，Z_T ²＝X_T ²+R_T ²，

Wherein, X_LIs the reactance and R of an equivalent transmission line between a power station and a large power grid_TBranch resistance, X, to the low side of the transformer_TBranch reactance, B, reduced to low voltage side for transformer_TSodium to ground, U, for the transformer to the low voltage side_1eRated voltage and U for low-voltage side of transformer_2eRated voltage delta for high-voltage side of transformer_u% is the stage voltage of the transformer; the level voltage is a percentage value of each gear of the regulating range of the tap changer of the transformer.

2. The method of claim 1, wherein the method for calculating the generator incremental reactive power output dynamic response parameter of the AVC system of the PQ node power station further comprises: the generator increases the voltage increment of the high-voltage side bus caused by the unit reactive power output asWherein K_qq,c2＝K_qq,tK_uu,t-K_qu,tK_uq,t。

3. The method of claim 1, wherein the method for calculating the generator incremental reactive power output dynamic response parameter of the AVC system of the PQ node power station further comprises: the increment of the output reactive power of the power station caused by the increase of the unit reactive power output of the generator isWherein K_qq,c2＝K_qq,tK_uu,t-K_qu,tK_uq,t。

4. A method for calculating a high-voltage side reactive power compensation dynamic response parameter of an AVC system of a PQ node power station is characterized by comprising the following steps:

acquiring gear n of the current tap switch of the transformer of the power station and the average value U of the three-phase bus line voltage at the low-voltage side of the transformer₁Average value U of three-phase bus line voltage on high-voltage side of transformer₂Total active power P output by the generator₁Total reactive power Q output by the generator₁And the total active power P output to the power grid by the high-voltage side bus₂And the total reactive power Q output to the power grid by the high-voltage side bus₂；

Calculating a high-voltage side reactive compensation dynamic response parameter, wherein the high-voltage side reactive compensation dynamic response parameter comprises: the unit reactive power input at the high-voltage side causes the increment of the bus voltage at the low-voltage side to be

Wherein, K_qu,c＝K_qu,lK_uu,t-K_qu,t，Z_T ²＝X_T ²+R_T ²，

Wherein, X_LIs the reactance and R of an equivalent transmission line between a power station and a large power grid_TBranch resistance, X, to the low side of the transformer_TBranch reactance, B, reduced to low voltage side for transformer_TSodium to ground, U, for the transformer to the low voltage side_1eRated voltage and U for low-voltage side of transformer_2eRated voltage delta for high-voltage side of transformer_u% is the stage voltage of the transformer; the level voltage is a percentage value of each gear of the regulating range of the tap changer of the transformer.

5. The method of claim 4 for calculating the high-side reactive power compensation dynamic response parameter of the AVC system of the PQ node power station, wherein the high-side reactive power compensation dynamic response parameter further comprises: the unit reactive power input at the high-voltage side causes the voltage increment of a bus at the high-voltage side to be

6. The method of claim 4 for calculating the high-side reactive power compensation dynamic response parameter of the AVC system of the PQ node power station, wherein the high-side reactive power compensation dynamic response parameter further comprises: the increment of the reactive power output by the power station caused by the unit reactive power input at the high-voltage side is

7. A method for calculating a transformer tap changer regulation dynamic response parameter of an AVC system of a PQ node power station is characterized by comprising the following steps:

acquiring gear n of the current tap switch of the transformer of the power station and the average value U of the three-phase bus line voltage at the low-voltage side of the transformer₁Average value U of three-phase bus line voltage on high-voltage side of transformer₂Total active power P output by the generator₁Total reactive power Q output by the generator₁And the total active power P output to the power grid by the high-voltage side bus₂And the total reactive power Q output to the power grid by the high-voltage side bus₂；

Calculating a transformer tap changer adjustment dynamic response parameter, wherein the transformer tap changer adjustment dynamic response parameter comprises: the voltage increment of the low-voltage side bus caused by the step-up of the tap changer of the transformer isThe voltage increment of the low-voltage side bus caused by the first gear reduction of the tap changer of the transformer is

Wherein K_qu,c＝K_qu,lK_uu,t-K_qu,t，Z_T ²＝X_T ²+R_T ²，

Wherein, X_LIs the reactance and R of an equivalent transmission line between a power station and a large power grid_TBranch resistance, X, to the low side of the transformer_TBranch reactance, B, reduced to low voltage side for transformer_TSodium to ground, U, for the transformer to the low voltage side_1eRated voltage and U for low-voltage side of transformer_2eRated voltage delta for high-voltage side of transformer_u% is the stage voltage of the transformer; the level voltage is a percentage value of each gear of the regulating range of the tap changer of the transformer.

8. The method of claim 7 for calculating transformer tap changer adjustment dynamic response parameters of a PQ node power station AVC system, wherein the transformer tap changer adjustment dynamic response parameters further comprise: the voltage increment of the high-voltage side bus caused by the step-up of the tap changer of the transformer isThe voltage increment of the high-voltage side bus caused by the first gear reduction of the tap changer of the transformer is

9. The method of claim 7 for calculating transformer tap changer adjustment dynamic response parameters of a PQ node power station AVC system, wherein the transformer tap changer adjustment dynamic response parameters further comprise: the increment of the output reactive power of the power station caused by the step-up of the tap changer of the transformer isThe increment of the output reactive power of the power station caused by reducing the first gear of the tap changer of the transformer is

10. A method for calculating a high-voltage side reactive compensation dynamic response parameter of an AVC system of a PV node power station is characterized by comprising the following steps:

transformer for collection power stationGear n of current tap switch and average value U of three-phase bus line voltage at low-voltage side of transformer₁Average value U of three-phase bus line voltage on high-voltage side of transformer₂Total reactive power Q output by the generator₁And the total active power P output to the power grid by the high-voltage side bus₂And the total reactive power Q output to the power grid by the high-voltage side bus₂；

Calculating a high-voltage side reactive compensation dynamic response parameter, wherein the high-voltage side reactive compensation dynamic response parameter comprises: the increase of the high-side bus voltage caused by the unit reactive power input at the high-side is

Wherein, K_qq,c1＝K_qq,t-K_qu,l·K_uq,t，Z_T ²＝X_T ²+R_T ²，

Wherein, X_LIs the reactance and R of an equivalent transmission line between a power station and a large power grid_TBranch resistance, X, to the low side of the transformer_TBranch reactance, U, which is reduced to the low-voltage side for the transformer_1eRated voltage and U for low-voltage side of transformer_2eRated voltage delta for high-voltage side of transformer_u% is the stage voltage of the transformer; the level voltage is a percentage value of each gear of the regulating range of the tap changer of the transformer.

11. The method for calculating the high-side reactive power compensation dynamic response parameter of the AVC system of the PV node power plant of claim 10, wherein the high-side reactive power compensation dynamic response parameter further comprises: the increment of the reactive power output by the power station caused by the unit reactive power input at the high-voltage side is

12. A method for calculating a transformer tap changer regulation dynamic response parameter of an AVC system of a PV node power station is characterized by comprising the following steps:

acquiring gear n of the current tap switch of the transformer of the power station and the average value U of the three-phase bus line voltage at the low-voltage side of the transformer₁Average value U of three-phase bus line voltage on high-voltage side of transformer₂Total reactive power Q output by the generator₁And the total active power P output to the power grid by the high-voltage side bus₂And the total reactive power Q output to the power grid by the high-voltage side bus₂；

Calculating a transformer tap changer adjustment dynamic response parameter, wherein the transformer tap changer adjustment dynamic response parameter comprises: the increment of the high-voltage side bus voltage caused by the step-up of the tap changer of the transformer isThe increment of the high-voltage side bus voltage caused by the fact that the tap changer of the transformer reduces the first gear is

Wherein, K_qq,c1＝K_qq,t-K_qu,l·K_uq,t，Z_T ²＝X_T ²+R_T ²，

Wherein, X_LIs the reactance and R of an equivalent transmission line between a power station and a large power grid_TBranch resistance, X, to the low side of the transformer_TBranch reactance, U, which is reduced to the low-voltage side for the transformer_1eRated voltage and U for low-voltage side of transformer_2eRated voltage delta for high-voltage side of transformer_u% is the stage voltage of the transformer; the level voltage is a percentage value of each gear of the regulating range of the tap changer of the transformer.

13. The method of claim 12, wherein the transformer tap changer adjustment dynamic response parameter further comprises: the increment of the output reactive power of the power station caused by the step-up of the tap changer of the transformer isThe increment of the output reactive power of the power station caused by reducing the first gear of the tap changer of the transformer is

14. The AVC system for the power station is characterized by comprising an acquisition module and a processor, wherein the acquisition module is used for acquiring a gear n of a current tap switch of a transformer of the power station and an average value U of three-phase bus line voltage at a low-voltage side of the transformer₁Average value U of three-phase bus line voltage on high-voltage side of transformer₂Total active power P output by the generator₁Total reactive power Q output by the generator₁And the total active power P output to the power grid by the high-voltage side bus₂And the total reactive power Q output to the power grid by the high-voltage side bus₂(ii) a The processor is used for executing the calculation method of any one of claims 1-13.