CN116073389A - Voltage stability evaluation method based on reactive synchronous balance capacity prediction of receiving-end power grid - Google Patents
Voltage stability evaluation method based on reactive synchronous balance capacity prediction of receiving-end power grid Download PDFInfo
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Abstract
The technical scheme adopted by the invention is as follows: a voltage stability evaluation method based on reactive synchronous balance capacity prediction of a receiving end power grid comprises the following steps: collecting operation data of a receiving end power grid for predicting reactive synchronous balance capacity of the receiving end power grid in real time; the reactive synchronous balancing capability characterizes reactive synchronous balancing levels of all nodes in the receiving-end power grid through reactive compensation equipment, energy storage equipment, load and voltage state information of all nodes in the receiving-end power grid; carrying out iterative computation according to the collected operation data of the receiving end power grid, and predicting reactive synchronous balancing capacity of each node of the receiving end power grid at the next moment; and evaluating voltage stability based on the predicted value of the reactive synchronous balance capacity of each node of the receiving end power grid at the next moment, and selectively adjusting reactive power output of reactive power compensation equipment, energy storage equipment and thermal power generating units of each node of the receiving end power grid. The method can rapidly predict the voltage stability of the receiving end power grid, adjust the power grid based on the prediction result and improve the operation safety of the power grid.
Description
Technical Field
The invention belongs to the technical field of operation of new energy power grids, and particularly relates to a voltage stability evaluation method based on reactive synchronous balance capacity prediction of a receiving power grid.
Background
Because of the problem that wind power and photovoltaic resources in China are distributed in different geographical areas and load-intensive areas, a plurality of ultra-high voltage transmission projects are developed in recent years. In order to positively realize the strategic targets of carbon peak and carbon neutralization, the new energy power generation duty ratio and the conveying capacity are further improved in the future of China, and the installed capacity of the local thermal power unit is compressed. At present, some urban electricity cannot be self-sufficient, the electricity purchasing proportion is 60% -70%, on one hand, dynamic reactive power sources mainly comprising generator sets at a receiving end load center are gradually reduced, and on the other hand, a large amount of direct current feeds in the system cause the reduction of voltage regulation capacity of the system, so that the transient voltage stability of a power grid faces a serious challenge. During the fault transient state recovery of the receiving end power grid, the inverter side converter consumes a large amount of dynamic reactive power, and when the inverter side converter is not matched with the transient state voltage recovery process of the system, the transient state voltage stability of the receiving end power grid is aggravated, so that the voltage stability is effectively evaluated in time, and the operation safety of the power grid is greatly influenced.
In the prior art, the voltage stability evaluation is generally judged based on a sensitivity index or a voltage stability margin index, the judgment accuracy of the method is general, and the utilization of the judgment result is not high. The voltage stability is estimated through reactive synchronous balancing capability of each node, a predictive voltage stability estimation method is not available, and a method for adjusting the power grid based on the estimation result is not available.
Disclosure of Invention
The invention aims to solve the defects in the background technology, and provides a voltage stability assessment method based on the prediction of reactive synchronous balance capacity of a receiving end power grid, which can rapidly predict the voltage stability of the receiving end power grid, adjust the power grid based on a prediction result and improve the operation safety of the power grid.
The technical scheme adopted by the invention is as follows: a voltage stability evaluation method based on reactive synchronous balance capacity prediction of a receiving end power grid comprises the following steps:
collecting operation data of a receiving end power grid for predicting reactive synchronous balance capacity of the receiving end power grid in real time; the reactive synchronous balancing capability characterizes reactive synchronous balancing levels of all nodes in the receiving-end power grid through reactive compensation equipment, energy storage equipment, load and voltage state information of all nodes in the receiving-end power grid;
carrying out iterative computation according to the collected operation data of the receiving end power grid, and predicting reactive synchronous balancing capacity of each node of the receiving end power grid at the next moment;
and evaluating voltage stability based on the predicted value of the reactive synchronous balance capacity of each node of the receiving end power grid at the next moment, and selectively adjusting reactive power output of reactive power compensation equipment, energy storage equipment and a thermal power unit of each node of the receiving end power grid.
According to the technical scheme, iterative computation is carried out according to the collected operation data of the receiving end power grid, and the process for predicting the reactive synchronous balancing capability of each node of the receiving end power grid at the next moment comprises the following steps: aiming at any node in the receiving-end power grid, firstly, the reactive synchronous balancing capacity of the node of the receiving-end power grid at the current moment of the node is obtained; taking the reactive synchronous balance capacity of the node of the receiving end power grid at the current moment as an initial value, and carrying out iterative calculation on the basis of the initial value based on a correction coefficient to obtain the reactive synchronous balance capacity of the node at the next moment; and the correction coefficient is used for representing the current fault state of the receiving-end power grid.
In the technical scheme, the reactive synchronous balancing capacity of the ith node of the receiving-end power grid at the current moment is calculated by adopting the following formula:
in which Q i,bc Reactive power output of reactive power compensation equipment at current moment of ith node of receiving end power grid, Q i,ES Reactive power output of energy storage equipment at current moment of ith node of receiving end power grid, Q i,load Reactive power demand of load at the current moment of the ith node of the receiving end power grid; u (U) i The voltage value at the current moment of the ith node of the receiving end power grid; u (U) i,pu U is the voltage reference value of the ith node of the receiving end power grid i,max 、U i,min The maximum value and the minimum value of the voltage of the ith node of the receiving end power grid.
According to the technical scheme, the reactive synchronous balancing capacity of each node of the receiving-end power grid at the next moment is predicted by adopting the normalized receiving-end power grid operation data.
In the technical scheme, reactive synchronous balancing capability ABS of the ith node of the receiving-end power grid at the next moment (m) i,t+1 The following formula was used for calculation:
in the ABS (0) i,t+1 Is an initial value; k (K) wgtbxz Is a correction coefficient; m is the iteration number, t is the current time, P ’ i,load Load power normalization value expressed as the ith node of the receiving end power grid; p (P) ’ i,WT Wind power output power normalization value expressed as ith node of receiving end power grid; p (P) ’ i,ES An energy storage device output power normalization value expressed as an ith node of the receiving end power grid; q (Q) ’ i,ES A reactive power output normalization value of the energy storage equipment expressed as an ith node of the receiving end power grid; q (Q) ’ i,bc A reactive power output normalization value of reactive power compensation equipment expressed as an ith node of the receiving end power grid; q (Q) ’ i,load The load demand normalization value is expressed as the ith node of the receiving end power grid.
In the above technical scheme, the process of evaluating the voltage stability based on the predicted value of the reactive synchronous balance capability of each node of the receiving end power grid at the next moment and selectively adjusting the reactive power output of the reactive power compensation equipment, the energy storage equipment and the thermal power generating unit of each node of the receiving end power grid comprises the following steps:
if the calculated predicted value of the reactive synchronous balancing capability of the ith node of the receiving-end power grid is greater than or equal to a set threshold value, the node does not need to increase reactive output;
if the calculated predicted value of the reactive synchronous balancing capability of the ith node of the receiving-end power grid is smaller than a set threshold value, the reactive power output of reactive power compensation equipment, energy storage equipment and a thermal power unit of the node is increased.
In the above technical scheme, if the calculated predicted value of the reactive synchronous balance capability of the ith node of the receiving power grid is smaller than the set threshold, the following total reactive output adjustment value delta Q of the ith node of the receiving power grid is calculated i ：
△Q i =K wgtbxz *ABS (m) i,t+1 （Q i,bc +Q i,ES ）；
Wherein K is wgtbxz To correct the coefficient, ABS (m) i,t+1 The reactive synchronous balancing capacity is the reactive synchronous balancing capacity of the receiving-end power grid at the next moment of the ith node; q (Q) i,ES Reactive power output of energy storage equipment of an ith node of a receiving end power grid at the current moment is represented; q (Q) i,bc The reactive power output value of reactive power compensation equipment of the ith node of the receiving end power grid at the current moment is represented;
the reactive power output total regulating value is provided by sequentially increasing reactive power output by reactive power compensation equipment, energy storage equipment and thermal power generating unit of the ith node of the receiving end power grid until the reactive power output total regulating value delta Q is met i ：
If the reactive power output of the reactive power compensation equipment is increased to the rated value and still does not meet the total reactive power output regulating value, the energy storage equipment supplements the reactive power output until the total reactive power output regulating value is met; and if the reactive power output of the reactive power compensation equipment and the reactive power output of the energy storage equipment are increased to the rated value and still not meet the total reactive power output regulating value, the reactive power output is increased by the thermal power generating unit to meet the residual requirements.
In the technical scheme, the following normalization value of the operation data of the receiving end power grid is calculated:
wherein P is i,load,max The load power maximum value of the ith node of the receiving end power grid; p (P) i,WT,max The wind power output power of the ith node of the receiving end power grid is the maximum value; p (P) i,ES,max The power output maximum value is the energy storage equipment output power of the ith node of the receiving end power grid; q (Q) i,load,max The reactive power output maximum value of the reactive power compensation equipment of the ith node of the receiving end power grid; q (Q) i,bc,max The reactive power output maximum value of the energy storage equipment of the ith node of the receiving end power grid; q (Q) i,ES,max The reactive power demand maximum value of the load of the ith node of the receiving end power grid; u (U) i,max The voltage maximum value of the ith node of the receiving end power grid; p (P) i,load The load power of the ith node of the current moment receiving end power grid, P i,WT Wind power output power of the ith node of the receiving end power grid; p (P) i,ES And outputting power to the energy storage equipment of the ith node of the receiving end power grid.
The invention provides a voltage stability evaluation system based on reactive synchronous balance capacity prediction of a receiving-end power grid, which is used for realizing the voltage stability evaluation method based on reactive synchronous balance capacity prediction of the receiving-end power grid.
The beneficial effects of the invention are as follows: the invention provides a method for evaluating reactive synchronous balancing capability of each node of a receiving-end power grid, so that voltage stability of the receiving-end power grid is effectively evaluated. According to the invention, the load power of each node of the receiving-end power grid, the wind power output power of each node, the output power of the energy storage equipment of each node, the reactive power output of the reactive power compensation equipment of each node, the reactive power output of the energy storage equipment of each node, the reactive power demand of each node and the voltage of each node are measured, and calculation is performed according to the measured parameters, so that the calculated reactive synchronous balance capacity can effectively reflect the real running state of each node. The reactive synchronous balancing capability defined by the invention can reflect whether the reactive power of each node of the power grid meets the requirement or not, and can accurately judge the reactive power deficiency degree of each node of the power grid at the receiving end. Meanwhile, the reactive synchronous balance capacity of the receiving end power grid node at the next moment is predicted, the reactive deficiency degree at the next moment can be judged, the reactive synchronous balance capacity of each node is predicted, and the voltage stability of the receiving end power grid at the next moment is rapidly and effectively predicted. According to the reactive power synchronous balancing method, the reactive power adjustment reference is given to each node of the receiving-end power grid in advance by calculating the total reactive power output adjustment value of the node of the receiving-end power grid according to the reactive power synchronous balancing capability prediction, so that an operator can conveniently dispatch and operate to give an instruction in advance, and the voltage stability of the receiving-end power grid is improved. Meanwhile, the invention provides an evaluation method for the voltage stability of the receiving end power grid, which is convenient for operators to know the running state of the system and provides data support for subsequent decisions.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The invention will now be described in further detail with reference to the drawings and specific examples, which are given for clarity of understanding and are not to be construed as limiting the invention.
As shown in fig. 1, the invention provides a voltage stability evaluation method based on reactive synchronous balance capacity prediction of a receiving-end power grid, which comprises the following steps:
collecting operation data of a receiving end power grid for predicting reactive synchronous balance capacity of the receiving end power grid in real time; the reactive synchronous balancing capability characterizes reactive synchronous balancing levels of all nodes in the receiving-end power grid through reactive compensation equipment, energy storage equipment, load and voltage state information of all nodes in the receiving-end power grid;
carrying out iterative computation according to the collected operation data of the receiving end power grid, and predicting reactive synchronous balancing capacity of each node of the receiving end power grid at the next moment;
and evaluating voltage stability based on the predicted value of the reactive synchronous balance capacity of each node of the receiving end power grid at the next moment, and selectively adjusting reactive power output of reactive power compensation equipment, energy storage equipment and a thermal power unit of each node of the receiving end power grid.
The process for predicting the reactive synchronous balancing capability of each node of the receiving end power grid at the next moment comprises the following steps of: aiming at any node in the receiving-end power grid, firstly, the reactive synchronous balancing capacity of the node of the receiving-end power grid at the current moment of the node is obtained; taking the reactive synchronous balance capacity of the node of the receiving end power grid at the current moment as an initial value, and carrying out iterative calculation on the basis of the initial value based on a correction coefficient to obtain the reactive synchronous balance capacity of the node at the next moment; and the correction coefficient is used for representing the current fault state of the receiving-end power grid.
The invention provides a voltage stability evaluation system based on reactive synchronous balance capacity prediction of a receiving-end power grid, which is used for realizing the voltage stability evaluation method based on reactive synchronous balance capacity prediction of the receiving-end power grid.
Specifically, the technical scheme adopted by the invention comprises the following steps:
step 1: and collecting reactive synchronous balance capacity prediction data of the receiving-end power grid in real time:
reactive synchronization balancing capability ABS defining receiving end power grid node i i The following are provided:
in which Q i,bc Reactive power output of reactive power compensation equipment at current moment of ith node of receiving end power grid, Q i,ES Reactive power output of energy storage equipment at current moment of ith node of receiving end power grid, Q i,load Reactive power demand of load at the current moment of the ith node of the receiving end power grid; u (U) i The voltage value at the current moment of the ith node of the receiving end power grid; u (U) i,pu U is the voltage reference value of the ith node of the receiving end power grid i,max 、U i,min The maximum value and the minimum value of the voltage of the ith node of the receiving end power grid. And (3) calculating the reactive synchronous balancing capacity of the receiving end power grid node i at the current moment by adopting the formula (1).
Collecting load power P of current-moment receiving end power grid node i i,load Wind power output power P of receiving end power grid node i i,WT Energy storage equipment output power P of receiving end power grid node i i,ES Reactive power output Q of reactive power compensation equipment of receiving-end power grid node i i,bc Reactive power output Q of energy storage equipment of receiving-end power grid node i i,ES Reactive power demand Q of load of receiving end power grid node i i,load Voltage U of current moment of receiving end power grid node i i The data obtained are as follows:
P i,load ,P i,WT ,P i,ES ,Q i,bc ,Q i,ES ,Q i,load ,U i （2）。
step 2: normalizing the reactive synchronous balance capacity prediction data of the receiving end power grid:
load power P to receiving end grid node i i,load Wind power output power P of receiving end power grid node i i,WT Energy storage equipment output power P of receiving end power grid node i i,ES Reactive power output Q of reactive power compensation equipment of receiving-end power grid node i i,bc Reactive power output Q of energy storage equipment of receiving-end power grid node i i,ES Reactive power demand Q of load of receiving end power grid node i i,load Voltage U of current moment of receiving end power grid node i i The following normalization process was performed:
wherein P is i,load,max The load power maximum value of the ith node of the receiving end power grid; p (P) i,WT,max The wind power output power of the ith node of the receiving end power grid is the maximum value; p (P) i,ES,max The power output maximum value is the energy storage equipment of the ith node of the receiving end power grid; q (Q) i,load,max The reactive power output maximum value of the reactive power compensation equipment of the ith node of the receiving end power grid; q (Q) i,bc,max The reactive power output maximum value of the energy storage equipment of the ith node of the receiving end power grid; q (Q) i,ES,max The reactive power demand maximum value of the load of the ith node of the receiving end power grid; u (U) i,max Is the voltage maximum value of the ith node of the receiving end power grid.
The maximum values are all set known fixed values. P (P) ’ i,load Load power normalization value expressed as the ith node of the receiving end power grid; p (P) ’ i,WT Wind power output power normalization value expressed as ith node of receiving end power grid; p (P) ’ i,ES An energy storage device output power normalization value expressed as an ith node of the receiving end power grid; q (Q) ’ i,ES A reactive power output normalization value of the energy storage equipment expressed as an ith node of the receiving end power grid; q (Q) ’ i,bc A reactive power output normalization value of reactive power compensation equipment expressed as an ith node of the receiving end power grid; q (Q) ’ i,load The load demand normalization value is expressed as the ith node of the receiving end power grid.
Step 3: reactive synchronous balancing capability ABS for next moment receiving end power grid node i i,t+1 And (3) predicting:
step 3.1: initializing reactive synchronous balancing capability of each node of receiving-end power grid
N nodes in the receiving-end power grid are provided, and the reactive synchronous balance capacity initial value of each node at the next moment is calculated by adopting the formula (1):
in the ABS (0) i,t+1 I epsilon {1,2,3, …, n } is the initial value of reactive synchronous balancing capability of the ith node at the next moment.
Step 3.2: determining a correction coefficient according to the fault information of the current system, and calculating a correction value of the reactive synchronous balance capacity of each node of the receiving end power grid at the next moment based on the correction coefficient on the basis of the initialization value:
wherein K is wgtbxz The correction coefficient of reactive synchronous balance capacity of the receiving-end power grid is set according to manual experience; m is the number of iterations.
The maximum value of the number of iterations is set to m=10 in this embodiment. After 10 iterations, if the predicted value of the reactive synchronous balancing capability of the ith node obtained through calculation is smaller than a set threshold value of 0.3, the voltage stability of the ith node of the receiving-end power grid is considered to be relatively poor, and reactive power output is sequentially increased by the reactive power compensation equipment, the energy storage equipment and the thermal power generating unit. After 10 iterations, if the predicted value of the reactive synchronous balancing capability of the ith node obtained through calculation is greater than or equal to a set threshold value of 0.3, the voltage stability of the ith node of the receiving-end power grid is considered to be relatively good, and reactive power output does not need to be increased.
Step 4: calculating the total reactive power output regulating value of the receiving end power grid node i:
△Q i =K wgtbxz *ABS (m) i,t+1 （Q i,bc +Q i,ES ） （6）
in the formula DeltaQ i The reactive power output total regulating value is the reactive power output total regulating value of the receiving end power grid node i; k (K) wgtbxz To correct the coefficient, ABS (m) i,t+1 The reactive synchronous balancing capacity is the reactive synchronous balancing capacity of the receiving-end power grid at the next moment of the ith node; q (Q) i,ES Reactive power output of energy storage equipment of an ith node of a receiving end power grid at the current moment is represented; q (Q) i,bc The reactive power output value of reactive power compensation equipment of the ith node of the receiving end power grid at the current moment is represented;
the reactive power output total regulating value is provided by sequentially increasing reactive power output by reactive power compensation equipment, energy storage equipment and thermal power generating unit of the ith node of the receiving end power grid until the reactive power output total regulating value delta Q is met i ：
If the reactive power output of the reactive power compensation equipment is increased to the rated value and still does not meet the total reactive power output regulating value, the energy storage equipment supplements the reactive power output until the total reactive power output regulating value is met; and if the reactive power output of the reactive power compensation equipment and the reactive power output of the energy storage equipment are increased to the rated value and still not meet the total reactive power output regulating value, the reactive power output is increased by the thermal power generating unit to meet the residual requirements.
The embodiment of the invention provides a voltage stability assessment method for predicting reactive synchronous balance capacity of a receiving end power grid, which comprises the following steps:
step 1: collecting reactive synchronous balance capacity prediction data of receiving-end power grid
The method comprises the steps of setting 3 nodes in a receiving-end power grid, and collecting load power P of a node i of the receiving-end power grid at the current moment i,load Wind power output power P of receiving end power grid node i i,WT Energy storage equipment output power P of receiving end power grid node i i,ES Reactive power output Q of reactive power compensation equipment of receiving-end power grid node i i,bc Reactive power output Q of energy storage equipment of receiving-end power grid node i i,ES Reactive power demand Q of load of receiving end power grid node i i,load Voltage U of current moment of receiving end power grid node i i The data obtained are as follows:
step 2: normalizing the reactive synchronous balance capacity prediction data of the receiving end power grid:
according to the maximum load power, the maximum wind power output power, the maximum energy storage device output power, the maximum reactive power output of the reactive compensation device, the maximum reactive power output of the energy storage device, the maximum load reactive power demand and the maximum voltage of 3 nodes of the receiving-end power grid, carrying out normalization processing on the data acquired by the formula (7) according to the formula (3), wherein the data processing result is as follows:
step 3: predicting reactive synchronous balancing capacity of a receiving end power grid node i at the next moment:
step 3.1: initializing reactive synchronous balancing capacity of each node of a receiving-end power grid:
calculating to obtain initial values of reactive synchronous balancing capacities of the 3 nodes at the next moment by adopting a formula (1):
ABS (0) 1，t+1 ，ABS (0) 2，t+1 ， ABS (0) 3，t+1 （9）
in the ABS (0) i,t+1 For the i node at the next momentInitial value of reactive synchronous balancing capability, i e {1,2,3, …, n }.
Step 3.2: calculating a correction value of reactive synchronous balance capacity of each node of the receiving end power grid at the next moment on the basis of the initialization value:
wherein K is wgtbxz The correction coefficient is a predicted value of reactive synchronous balancing capability of the receiving-end power grid; m is the number of iterations.
After 10 iterations, if the number of iterations is 10 according to the calculated i node reactive synchronization setting, after 10 iterations, obtaining the reactive synchronization balance capacity prediction correction value of 3 nodes as ABS (10) 1,t+1 ，ABS (10) 2,t+1 ，ABS (10) 3,t+1 。
If the predicted value of the reactive synchronous balancing capability of the ith node is smaller than 0.3, the voltage stability of the ith node of the receiving-end power grid is considered to be relatively poor, and reactive power output is increased by the reactive power compensation equipment, the energy storage equipment and the thermal power generating unit. After 10 iterations, if the predicted value of the reactive synchronous balancing capability of the ith node of the receiving-end power grid obtained through calculation is greater than or equal to 0.3, the voltage stability of the ith node of the receiving-end power grid is considered to be relatively good, and reactive power output does not need to be increased. In this embodiment, the predicted values of reactive synchronous balancing capacities of 3 nodes are all smaller than 0.3, so step 4 needs to be executed.
Step 4: calculating the total reactive power output regulating value of the receiving end power grid node i:
△Q i =K wgtbxz *ABS (10) i,t+1 （Q i,bc +Q i,ES ）
in the formula DeltaQ i And the reactive power output total regulating value is the reactive power output total regulating value of the receiving end power grid node i.
The reactive power output total regulating value of each node is provided by reactive power compensation equipment, energy storage equipment and a thermal power unit, and the provided sequence is the reactive power compensation equipment, the energy storage equipment and the thermal power unit. And if the reactive power output of the reactive power compensation equipment is in a rated value which still does not meet the total reactive power output regulating value, the energy storage equipment supplements reactive power. And if the reactive outputs of the reactive compensation equipment and the energy storage equipment are both rated values, finally supplementing the residual reactive demands by the thermal power generating unit. According to practical engineering experience, before the reactive power output of the thermal power generating unit reaches a rated value, the sum of the reactive power output of the reactive power compensation equipment, the energy storage equipment and the thermal power generating unit can meet the total reactive power output regulating value requirement.
The foregoing is merely illustrative of specific embodiments of the present invention, and the present invention is not limited thereto. Therefore, it is intended that all modifications, equivalents, improvements and modifications falling within the spirit and scope of the invention are within the scope of the claims.
What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (9)
1. The voltage stability evaluation method based on the reactive synchronous balance capacity prediction of the receiving end power grid is characterized by comprising the following steps of: the method comprises the following steps:
collecting operation data of a receiving end power grid for predicting reactive synchronous balance capacity of the receiving end power grid in real time; the reactive synchronous balancing capability characterizes reactive synchronous balancing levels of all nodes in the receiving-end power grid through reactive compensation equipment, energy storage equipment, load and voltage state information of all nodes in the receiving-end power grid;
carrying out iterative computation according to the collected operation data of the receiving end power grid, and predicting reactive synchronous balancing capacity of each node of the receiving end power grid at the next moment;
and evaluating voltage stability based on the predicted value of the reactive synchronous balance capacity of each node of the receiving end power grid at the next moment, and selectively adjusting reactive power output of reactive power compensation equipment, energy storage equipment and a thermal power unit of each node of the receiving end power grid.
2. A method according to claim 1, characterized in that: the process for predicting the reactive synchronous balancing capability of each node of the receiving end power grid at the next moment comprises the following steps of: aiming at any node in the receiving-end power grid, firstly, the reactive synchronous balancing capacity of the node of the receiving-end power grid at the current moment of the node is obtained; taking the reactive synchronous balance capacity of the node of the receiving end power grid at the current moment as an initial value, and carrying out iterative calculation on the basis of the initial value based on a correction coefficient to obtain the reactive synchronous balance capacity of the node at the next moment; and the correction coefficient is used for representing the current fault state of the receiving-end power grid.
3. A method according to claim 2, characterized in that: reactive synchronous balancing capability ABS of ith node of receiving-end power grid at current moment i The following formula was used for calculation:
in which Q i,bc Reactive power output of reactive power compensation equipment at current moment of ith node of receiving end power grid, Q i,ES Reactive power output of energy storage equipment at current moment of ith node of receiving end power grid, Q i,load Reactive power demand of load at the current moment of the ith node of the receiving end power grid; u (U) i The voltage value at the current moment of the ith node of the receiving end power grid; u (U) i,pu U is the voltage reference value of the ith node of the receiving end power grid i,max 、U i,min The maximum value and the minimum value of the voltage of the ith node of the receiving end power grid.
4. A method according to claim 3, characterized in that: and predicting reactive synchronous balancing capacity of each node of the receiving end power grid at the next moment by adopting the normalized receiving end power grid operation data.
5. A method according to claim 4, characterized in that: reactive synchronous balancing capability ABS of receiving end power grid at next moment of ith node (m) i,t+1 The following formula was used for calculation:
in the ABS (0) i,t+1 Is an initial value; k (K) wgtbxz Is a correction coefficient; m is the iteration number, t is the current time,
P ’ i,load load power normalization value expressed as the ith node of the receiving end power grid; p (P) ’ i,WT Wind power output power normalization value expressed as ith node of receiving end power grid; p (P) ’ i,ES An energy storage device output power normalization value expressed as an ith node of the receiving end power grid; q (Q) ’ i,ES A reactive power output normalization value of the energy storage equipment expressed as an ith node of the receiving end power grid; q (Q) ’ i,bc A reactive power output normalization value of reactive power compensation equipment expressed as an ith node of the receiving end power grid; q (Q) ’ i,load The load demand normalization value is expressed as the ith node of the receiving end power grid.
6. A method according to claim 1, characterized in that: the process for evaluating the voltage stability based on the predicted value of the reactive synchronous balance capacity of each node of the receiving end power grid at the next moment and selectively adjusting the reactive power output of the reactive power compensation equipment, the energy storage equipment and the thermal power generating unit of each node of the receiving end power grid comprises the following steps:
if the calculated predicted value of the reactive synchronous balancing capability of the ith node of the receiving-end power grid is greater than or equal to a set threshold value, the reactive output does not need to be increased;
if the calculated predicted value of the reactive synchronous balancing capability of the ith node of the receiving-end power grid is smaller than a set threshold value, the reactive power output of reactive power compensation equipment, energy storage equipment and a thermal power unit of the node is increased.
7. A method according to claim 6, characterized in that: if the calculated predicted value of the reactive synchronous balance capacity of the ith node of the receiving power grid is smaller than the set threshold value, calculating the total reactive output regulating value delta Q of the ith node of the receiving power grid by adopting the following formula i ：
△Q i =K wgtbxz *ABS (m) i,t+1 （Q i,bc +Q i,ES ）；
Wherein K is wgtbxz To correct the coefficient, ABS (m) i,t+1 The reactive synchronous balancing capacity is the reactive synchronous balancing capacity of the receiving-end power grid at the next moment of the ith node; q (Q) i,ES Reactive power output of energy storage equipment of an ith node of a receiving end power grid at the current moment is represented; q (Q) i,bc The reactive power output value of reactive power compensation equipment of the ith node of the receiving end power grid at the current moment is represented;
the reactive power output total regulating value is provided by sequentially increasing reactive power output by reactive power compensation equipment, energy storage equipment and thermal power generating unit of the ith node of the receiving end power grid until the reactive power output total regulating value delta Q is met i ：
If the reactive power output of the reactive power compensation equipment is increased to the rated value and still does not meet the total reactive power output regulating value, the energy storage equipment supplements the reactive power output until the total reactive power output regulating value is met; and if the reactive power output of the reactive power compensation equipment and the reactive power output of the energy storage equipment are increased to the rated value and still not meet the total reactive power output regulating value, the reactive power output is increased by the thermal power generating unit to meet the residual requirements.
8. A method according to claim 5, characterized by: calculating a normalized value of the operation data of the receiving end power grid by adopting the following steps:
wherein P is i,load,max The load power maximum value of the ith node of the receiving end power grid; p (P) i,WT,max The wind power output power of the ith node of the receiving end power grid is the maximum value; p (P) i,ES,max The power output maximum value is the energy storage equipment output power of the ith node of the receiving end power grid; q (Q) i,load,max The reactive power output maximum value of the reactive power compensation equipment of the ith node of the receiving end power grid; q (Q) i,bc,max The reactive power output maximum value of the energy storage equipment of the ith node of the receiving end power grid; q (Q) i,ES,max Is the ith node of the receiving end power gridThe reactive demand maximum of the load; u (U) i,max The voltage maximum value of the ith node of the receiving end power grid; p (P) i,load The load power of the ith node of the current moment receiving end power grid, P i,WT Wind power output power of the ith node of the receiving end power grid; p (P) i,ES And outputting power to the energy storage equipment of the ith node of the receiving end power grid.
9. A voltage stability evaluation system based on reactive synchronous balance capacity prediction of a receiving end power grid is characterized in that: the system is used for realizing the voltage stability evaluation method based on the reactive synchronous balance capacity prediction of the receiving-end power grid according to any one of claims 1-8.
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