KR102551927B1 - Comprehensive control method and system that guarantees voltage stability in power recovery phase of multi-phase DC system - Google Patents

Abstract

The present invention discloses a comprehensive control method and system for ensuring voltage stability in a multi infeed DC system power recovery step, which linearizes the power flow equation of an AC-DC system to determine the effective power and and obtaining a sensitivity matrix of node voltages for reactive power transmitted by the compensating device. Based on the amount of node deviation, build an optimization model of DC power recovery that is constrained within the safety range to obtain an answer, and obtain an optimal recovery amount of power for each DC system at each time step on the premise of voltage safety; Establish an optimization model for the amount of reactive power compensator expansion aimed at minimizing the amount of node voltage deviation, get an answer, and obtain the optimal amount of reactive power compensator after the completion of DC power recovery for each time step, resulting in DC power recovery Make the node voltage deviation as low as possible. According to the present invention, the power recovery control of a multi-phase DC system can be guided online to sufficiently ensure voltage stability and recovery efficiency in the recovery process.

Description

Comprehensive control method and system that guarantees voltage stability in power recovery phase of multi-phase DC system

The present invention relates to the field of DC system power recovery technology, and more particularly, to a comprehensive control method and system for ensuring voltage stability in a multi-infeed DC system power recovery step.

The statements in this section provide only background information related to the present invention and do not necessarily constitute prior art.

Among multi-phase DC systems, direct current has dense drop points, strengthens electrical coupling, and has a more complex operating mechanism. At present, domestic and foreign power grids have very little experience in restoring operation after a large-scale power outage in multi-phase DC systems, so usually the AC system is restored first and the DC system is restored last. However, the DC system has the advantage of large transport capacity and fast power control, and if the recovery ability of the DC system is sufficiently used during the system recovery process, the system recovery speed can be greatly accelerated. The study on has a very important and practical significance.

In order for the DC system to participate in recovery, certain safety constraints must be satisfied. Currently, research on the safety control of the DC system operation stage is relatively complete, so that the safety of the DC system operation can be realized. However, the safety control method in the power recovery phase after the DC system is operated is relatively insufficient. The DC system must consume a large amount of reactive power when operating normally. As the effective power transported by the DC system increases, the reactive power consumed by the DC system increases proportionally. Therefore, in the step of restoring the power of the multi-phase DC, the problem that the AC voltage is lowered due to insufficient system reactive power is very obvious. Therefore, it is necessary to pay attention to the voltage stability of the multi-phase DC system power recovery process and to present a comprehensive recovery control method that guarantees voltage stability.

In order to solve the problem of low AC voltage due to multi-infeed DC system power recovery, the present invention can ensure voltage stability and improve recovery efficiency in the multi-infeed DC system power recovery step. It provides a comprehensive control method and system that guarantees voltage stability.

In some implementations, using the following technical measures,

Establishing a power flow equation of the AC-DC system based on the initial state for each time step;

obtaining a sensitivity matrix of node voltage for effective power transported by the DC system and a sensitivity matrix of node voltage for reactive power transmitted by the reactive compensation device;

According to the sensitivity matrix of node voltage for effective power transported in direct current, an optimization model of DC effective power recovery constrained within a safe range by the amount of deviation of all node voltages is built, and the model is obtained to assume voltage safety for each time step. obtaining an optimal recovery amount of effective power for each direct current system;

Based on the sensitivity matrix of the node voltage for the reactive power sent by the reactive power compensator, build an optimization model for the amount of reactive power device expansion aimed at minimizing and squaring the node voltage deviation, and obtain the model for each time step Step of obtaining an optimal amount of expansion for each invalid compensation device after DC power recovery is completed so that the node voltage deviation generated by DC power recovery is minimized; voltage in the multi-phase DC system power recovery step, comprising It provides a comprehensive control method that guarantees stability.

In some other embodiments, using the following technical solutions,

A device used to construct power flow equations for AC-DC systems based on initial states per time step;

a device used to obtain a sensitivity matrix of node voltage for active power transported by the direct current system, and a device used for obtaining a sensitivity matrix for node voltage to reactive power sent by the reactive compensation device;

an apparatus used to build an optimization model of DC effective power recovery constrained within a safe range by the amount of deviation of all node voltages according to a sensitivity matrix of node voltages for effective power transported in direct current; A device used to obtain the model and obtain an optimal recovery amount of effective power for each DC system under the premise of voltage safety for each time step;

A device used to build an optimization model for the amount of reactive power device expansion aimed at minimizing and squaring the amount of node voltage deviation based on the sensitivity matrix of the node voltage for the reactive power sent by the reactive power compensator; A device used to obtain a model and obtain an optimal amount of expansion for each invalid compensation device after DC power recovery for each time step is completed, so that node voltage deviation generated by DC power recovery is minimized. To provide a comprehensive control system that guarantees voltage stability in the multi-phase DC system power recovery step.

In some other implementations, using the following technical measures,

It includes a processor and a computer readable storage medium, wherein the processor is used to implement each instruction; A computer-readable storage medium is used to store several commands, and the commands are loaded by a processor to provide a terminal device suitable for executing a comprehensive control method for ensuring voltage stability in the multi-phase direct current system power recovery step. .

In some other implementations, using the following technical measures,

Among them, a plurality of commands are stored, and the commands are loaded by the processor of the terminal device to provide a computer readable storage medium suitable for executing a comprehensive control method for ensuring voltage stability in the multi-phase direct current system power recovery step.

Compared to the prior art, the present invention achieves the following effects.

The method of the present invention can solve the problem of lowering the AC voltage by restoring the power of the DC system; Within each time step of recovery, the method optimizes the recovery amount of DC system effective power to improve recovery efficiency under the premise of ensuring system voltage stability, and then optimizes the increase amount of reactive power compensation device to achieve DC power recovery. The system voltage is kept constant by minimizing the amount of voltage deviation by node.

1 is a process diagram of a comprehensive control method for ensuring voltage stability in a multi infeed DC system power recovery step in Embodiment 1 of the present invention;
Fig. 2 is a iterative process diagram of the method in Example 1 of the present invention;
3 is a block diagram of a power system in Embodiment 1 of the present invention;
4 is a node voltage change curve in the DC power recovery step of the comprehensive control method according to the present invention;
5 is a node voltage change curve in the DC power recovery step of the comprehensive control method according to the present invention.

All of the following detailed descriptions are illustrative, and are intended to further explain the present application. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs.

Above all, the terms used herein are only for the purpose of describing specific implementations, and are not intended to limit the illustrative implementations according to the present application. Unless the context clearly indicates otherwise, the terms used herein are intended to include both the singular and plural forms, and in addition, when the terms “comprising” and/or “inclusive” are used in the specification, they are characterized by, It is also to be understood that it is specified that steps, operations, elements, assemblies, and/or combinations thereof exist.

Example 1

In the multi-infeed DC system power recovery process, the reactive power level of the system is a major factor affecting the node voltage. Therefore, the variables determining the node voltage are the reactive power absorbed by the DC inverter and the reactive power transmitted by the reactive power compensator. However, since the reactive power absorbed by the DC system is directly related to the effective power recovered by the DC system, it is possible to ensure the voltage safety of the node and improve the recovery speed by rationally adjusting the amount of power recovery for each DC system at each time step. there is; After the completion of the DC power recovery for each time step, a constant voltage deviation is necessarily generated. By adding reactive power compensation facilities in the system, the voltage deviation caused by the DC power recovery can be minimized and the constant voltage can be maintained. In addition, multi-phase DC systems have mutual influences between DC systems, and how to accurately measure the interactions between DC systems has an important significance in reliably ensuring voltage stability in the multi-phase DC system power recovery process.

In one or more embodiments, a comprehensive control method for ensuring voltage stability in the multi-phase DC system power recovery step is disclosed. As shown in FIGS. 1 and 2, the method is divided into a plurality of time steps, By time step,

(1) constructing a power flow equation of an AC-DC system based on the initial state for each time step;

(2) obtaining a sensitivity matrix of node voltage for effective power transmitted by the DC system and a sensitivity matrix of node voltage for reactive power transmitted by the reactive compensation device;

(3) Establish an optimization model of DC active power recovery that is constrained within the safety range by the amount of deviation of all node voltages according to the sensitivity matrix of node voltage for effective power transported in DC, and obtain the model to ensure voltage safety for each time step. Obtaining an optimal recovery amount of effective power for each DC system on the premise of;

(4) Based on the sensitivity matrix of the node voltage for the reactive power sent by the reactive power compensator, build an optimization model for the amount of reactive power device expansion aimed at minimizing and squaring the node voltage deviation, and obtain the model After the completion of DC power recovery for each time step, obtaining an optimal amount of expansion for each invalid compensation device so that node voltage deviation generated by DC power recovery is minimized.

Here, during step (1), the power flow equation of the AC-DC system is composed of the AC system power flow equation and the DC system operating equation. The form of the AC system power flow equation is:

이며,

is,

와

은 교류발전유닛이 노드

에게 발송하는 유효 파워와 무효 파워이며;

와

은 노드

의 부하 소모의 유효 파워와 무효 파워이며;

와

은 교류를 주입하는 노드

의 유효 파워와 무효 파워이고 그 계산 형식은,From here,

and

The AC power generation unit is a node

effective power and inactive power sent to;

and

silver node

is the effective power and reactive power of the load consumption of;

and

silver node injecting alternating current

is the effective power and reactive power of, and the calculation form is,

이며,

is,

와

는 노드

,

의 전압이고

,

,

는 각각 노드

,

간의 전기 전도, 파워 앵글(power angle) 차, 서셉턴스(susceptance)이다.From here,

and

is the node

,

is the voltage of

,

,

are each node

,

conduction of electricity between the liver, It is the power angle difference, susceptance.

The operating equation of the DC system is as follows.

Based on the control equation for each control method of the DC system, the operating equation of the DC system under the determined control parameters is obtained.

은 인피드(in feed) 노드

의 직류시스템이 주입한 유효 파워이고

은 인피드 노드

의 직류시스템이 주입한 무효 파워이며;

는 인피드 노드

의 직류시스템 인버터의 역률각(power factor angle)이며;

는 노드

의 파워 앵글(power angle)이다.From here,

is the in feed node

of is the effective power injected by the DC system,

is the infeed node

is the reactive power injected by the direct current system of;

is the infeed node

is the power factor angle of the DC system inverter of;

is the node

of is the power angle.

The operating equation of the DC system expresses the relationship between the effective power and reactive power transported by direct current and the voltage amplitude and phase angle of the commutation busbar in quantitative terms.

The power flow equation of the AC-DC system can be obtained by operating the power balance equation at the rectification bus point. The format of the AC-DC system power flow equation is as follows.

In step (2), a sensitivity matrix of node voltage for effective power transported in direct current and a sensitivity matrix for node voltage for reactive power sent by the reactive compensation device are obtained through the power flow equation of the AC-DC system.

To calculate the sensitivity matrix of the node voltage to the effective power transported by DC, the reactive power absorbed by the DC system is expressed as the effective power transported by the DC system based on the power coefficient of the DC inverter, then Substituting into the sensitivity matrix of node voltage for reactive power and arranging, a sensitivity matrix of node voltage for effective power transported in direct current can be obtained.

The reactive power sent by the reactive power compensator is the reactive power injected by the node, and therefore, the sensitivity matrix of the node voltage for the reactive power injected by the node is the node voltage for the reactive power sent by the reactive power compensator. is the sensitivity matrix.

First, the one-way is obtained using the amplitude and phase angle of the AC-DC power flow equation for each node voltage to obtain the Jacobian matrix of the power flow of the AC-DC system.

이며,

is,

,

,

와

는 각각 야코비안 행렬의 상응되는 블록별 행렬이다. 무효 파워와 전압 진폭의 작용관계만 감안하여 교-직류시스템 전력 조류 야코비안 행렬을 차원축소(dimension reduction) 행렬인In the expression

,

,

and

are the respective block-by-block matrices of the Jacobian matrix. Considering only the functional relationship between reactive power and voltage amplitude, the AC-DC system power current Jacobian matrix is a dimension reduction matrix,

로 전환시키며;

converts to;

The equation that can calculate the sensitivity of the node voltage to the reactive power by inverting the above equation is

이며;

is;

는 무효 파워에 대한 노드 전압의 민감도 행렬이다. 무효 파워에 대한 노드 전압의 민감도 행렬을 통해 직류로 수송하는 유효 파워에 대한 노드 전압의 민감도을 얻을 수 있는 방정식은From here,

is the sensitivity matrix of node voltage to reactive power. The equation for obtaining the sensitivity of the node voltage to the effective power transported in direct current through the sensitivity matrix of the node voltage to the reactive power is

이며;

is;

는 인피드 노드

의 직류시스템 인버터의 역률각이며;

는 직류로 수송하는 유효 파워에 대한 노드 전압의 민감도 행렬이며;

는 직류 파워의 회복량이다.In the expression

is the infeed node

is the power factor angle of the DC system inverter of;

is a sensitivity matrix of node voltage to effective power transported in direct current;

is the recovery amount of DC power.

The equation for obtaining the sensitivity of the node voltage to the reactive power sent by the reactive power compensation device through the sensitivity matrix of the node voltage to the reactive power is

이며,

is,

는 무효파워보상장치의 무효 파워 추가발송량이다.In the expression

is the additional amount of reactive power sent by the reactive power compensator.

In step (3), direct current effective power constrained within a safe range by the node voltage deviation

The process of constructing an optimization model for recovery is as follows.

이며, 즉, 각 직류시스템 시간 스탭별 유효 파워 회복량이다.the decision variable is

, that is, the effective power recovery amount for each DC system time step.

The amount of DC power recovery per time step targeted for optimization is maximized.

이며,

is,

The Equation Equation constraining the sensitivity of the node voltage to the effective power transported in direct current is:

이며,

is,

The inequality between the DC power upper limit limit and the node voltage safety range limit is

이고,

ego,

는 직류로 수송하는 파워의 상한이며;

는 노드

의정격 전압이고

는 노드 전압의 안전 하한이다.In the expression

is the upper limit of power transported in direct current;

is the node

is the rated voltage

is the safe lower limit of the node voltage.

Furthermore, the optimization model of DC transport effective power recovery, which is constrained within the safety range by the node voltage deviation, obtains an answer through CPLEX's linear planning function and calculates the value of each DC system for each time step assuming that it is within the safety range by the node voltage. Get optimal recovery power. The calculation result is sent to the controller of each DC system to control the recovery of DC effective power.

In step (4), the construction process of the optimization model of the amount of reactive power compensator expansion aiming at the square and minimization of the node voltage deviation value is as follows.

이며, 즉, 시간 스탭별 직류 파워 회복이 완성된 후의 노드별 무효파워보상장치 증설량이다.the decision variable is

, that is, the amount of augmented reactive power compensator for each node after DC power recovery for each time step is completed.

이며;The optimization target is the square of the deviation value of the node voltage and the minimum,

is;

이며;The equation for limiting the sensitivity to the reactive power transmitted by the reactive power compensator is

is;

이다.The inequality of the capacity upper limit of the reactive power compensator is

am.

는 무효파워보상장치의 용량 상한이다.In the expression

is the upper limit of the capacity of the reactive power compensator.

Furthermore, the optimization model of the reactive power compensator expansion amount, which aims to square and minimize the node voltage deviation value, obtains an answer through the linear planning function of CPLEX and calculates the reactive power compensator after DC power recovery is completed for each time step. The optimum amount of expansion is obtained so that the node voltage deviation generated by DC power recovery is minimized. The calculation result is sent to the reactive power compensation facility controller of each substation to control reactive power compensation.

This embodiment takes the 4-DC infeed 39-node system shown in FIG. 3 as an example to further explain the specific implementation process of the present invention.

인 시각부터 회복을 시작하며 시간 스탭 길이는 5min 이다. 본 실례의 구체적인 구현과정은,The power system formation method of this embodiment is improved from the IEEE-39 node standard power system, and the power generation units of nodes 35, 36, 37 and 38 are modified to an infeed direct current system; Dotted lines in Fig. 3 indicate circuits or busbars that have not yet been recovered; In the power recovery phase, the initial power of each DC system is set to 10% of the rated power,

The recovery starts from the time of , and the length of the time step is 5 min. The specific implementation process of this example is,

(1) Forming an AC-DC system power flow equation by obtaining initial power grid information for each time step including node voltage, load power, generator power, DC control parameters, DC transport power and reactive power compensator input amount;

(2) The power flow Jacobian matrix is obtained by obtaining the one-way of the AC-DC system power flow equation, and the sensitivity matrix of the node voltage to the reactive power is obtained by extracting and inverting the matrix for each block that reflects the effect of the node voltage on the reactive power. Obtaining, and further, obtaining a sensitivity matrix of the node voltage for the effective power transported in direct current and a sensitivity matrix of the node voltage for the reactive power sent by the reactive compensator;

(3) Build an optimization model for DC power recovery using the sensitivity matrix of node voltage for effective power transported in DC, obtain the model using CPLEX, and obtain the optimal amount of power recovery for each DC system under the voltage safety premise. sending to a DC rectification station controller to control power recovery based on the optimization result;

(4) Establish an optimization model for the expansion amount of the reactive power compensation device using the sensitivity matrix of the node voltage for the active power sent by the reactive power compensation device, and obtain the model using CPLEX to minimize the amount of voltage deviation caused by DC power recovery. Obtaining an optimal expansion plan for a reactive power compensator, sending it to each substation reactive power compensating controller, and controlling reactive power compensation by an optimization result; includes

If all four DC system powers are not recovered, the optimization control of the next time step is entered; When all four DC powers are recovered, the multi-phase DC system power recovery step ends.

When node 16 is set as the backbone node of the embodiment system, after one-step operation, the voltage of node 16 is calculated using power flow calculation software to reflect the overall voltage level of the system. 4 records the voltage change of node 16 in the multi-machine DC system power recovery process using the comprehensive control method according to the present invention. As shown in FIG. 4, all of the node voltages lowered by DC power recovery for each time step are placed within a safe range, and after going through reactive power control, the node voltage is restored to a level close to the static voltage again, and the entire multi-phase DC system power The voltage stability of the recovery process was guaranteed, and the total time required for DC power recovery was 20 minutes. Figure 5 records the voltage change of node 16 in the power recovery process of the multi-phase DC system without using the comprehensive control method according to the present invention, and each DC system at each time step recovered 10% power and compensated for the invalid power. Not timely control.

As shown in Fig. 5, since the comprehensive control method for ensuring voltage safety is not used, as the power of the multi-phase direct current system recovers, the system voltage level also drops seriously, posing a serious threat to the operation safety of the system; In addition, the total time required for DC power recovery reaches 40 minutes, which is longer than the total required time for DC power recovery in the comprehensive control method according to the present invention. Therefore, it is realized that the present invention has important guiding significance for the improvement of safety and high efficiency participating in recovery of multi-phase direct current system.

Example 2

In one or multiple implementations,

A device used to construct the power flow equation of an AC-DC system based on the initial state at each time step;

a device used to obtain a sensitivity matrix of node voltage for active power transported by the direct current system, and a device used for obtaining a sensitivity matrix for node voltage to reactive power sent by the reactive compensation device;

an apparatus used to build an optimization model of DC effective power recovery constrained within a safe range by the amount of deviation of all node voltages according to a sensitivity matrix of node voltages for effective power transported in direct current; A device used to obtain the model and obtain an optimal recovery amount of effective power for each DC system under the premise of voltage safety for each time step;

A device used to build an optimization model for the amount of reactive power device expansion aimed at minimizing and squaring the amount of node voltage deviation based on the sensitivity matrix of the node voltage for the reactive power sent by the reactive power compensator; A device used to obtain a model and obtain an optimal amount of expansion for each invalid compensation device after DC power recovery is completed for each time step so that node voltage deviation generated by DC power recovery is minimized; It provides a comprehensive control system for ensuring voltage stability in the multi-phase DC system power recovery step, characterized in that it comprises a.

In some other embodiments, it includes a processor and a computer readable storage medium, wherein the processor is used to implement each instruction; A computer-readable storage medium is used to store several commands, and the commands are loaded by a processor to a terminal suitable for executing the comprehensive control method for ensuring voltage stability in the multi-phase DC system power recovery step in Embodiment 1. reveal the device.

In some other embodiments, a plurality of commands are stored therein, and the commands are loaded by a processor of a terminal device to a computer suitable for executing the comprehensive control method for ensuring voltage stability in the multi-phase DC system power recovery step of Embodiment 1. Discloses a readable storage medium.

Although the foregoing has been combined with the drawings to explain specific embodiments of the present invention, the scope of protection of the present invention is not limited, and those skilled in the art to which the present invention pertains will be It should be noted that various modifications or variations made directly by technicians without creative labor are still included within the protection scope of the present invention.

Claims (10)

In the comprehensive control method for ensuring voltage stability in the multi-phase direct current system power recovery step,
Establishing a power flow equation of the AC-DC system based on the initial state for each time step;
obtaining a sensitivity matrix of node voltage for effective power transported by the DC system and a sensitivity matrix of node voltage for reactive power transmitted by the reactive compensation device;
According to the sensitivity matrix of node voltage for effective power transported in direct current, an optimization model of DC active power recovery that is constrained within a safe range by the amount of deviation of all node voltages is built, and the model is obtained to determine voltage safety for each time step. obtaining an optimal recovery amount of effective power for each DC system on the premise;
Based on the sensitivity matrix of the node voltage for the reactive power sent by the reactive power compensator, build an optimization model for the amount of reactive power device expansion aimed at minimizing and squaring the node voltage deviation, and obtain the model to determine the time step In the multi-machine DC system power recovery step, which includes a step of obtaining an optimal amount of expansion for each invalid compensator after completion of the DC power recovery, so that the node voltage deviation generated by the DC power recovery is minimized. A comprehensive control method that guarantees voltage stability. According to claim 1,
The process of building the power flow equation of the AC-DC system is specifically,
AC power unit node

Based on the effective power and inactive power sent to the node,

The active power and reactive power of the load consumption of and the node injecting the alternating current

Constructing an AC system power flow equation from the relationship between the active power and the reactive power of;
constructing an operating equation of a direct current system based on a relationship between active power and reactive power transported in direct current, respectively, and voltage amplitude and phase angle of a commutation bus;
In the multi-phase DC system power recovery step comprising the step of obtaining the power flow equation of the AC-DC system by constructing a power balance equation based on the power flow equation of the AC system and the operating equation of the DC system at the rectification bus point. A comprehensive control method that guarantees voltage stability. According to claim 1,
Obtaining the sensitivity matrix of the node voltage for the effective power transported by the DC system is specifically,
obtain one-way using the amplitude and phase angle of the AC-DC power flow equation for each node voltage and obtain the Jacobian matrix of the power flow of the AC-DC system; Obtaining a sensitivity matrix of the node voltage to the reactive power injected by the node by extracting and inverting a matrix for each block that reflects the effect of the node voltage amplitude on the reactive power injected by the node from the Jacobian matrix;
Based on the power coefficient of the DC inverter, the reactive power absorbed by the DC system is expressed as the effective power transported by the DC system, then it is substituted into the sensitivity matrix of the node voltage for the reactive power injected by the node, and the DC system transported A comprehensive control method for ensuring voltage stability in a multi-phase direct current system power recovery step, comprising: obtaining a sensitivity matrix of node voltage for effective power. According to claim 1,
Obtaining the sensitivity matrix of the node voltage for the reactive power sent by the reactive power compensator is specifically,
Using the AC-DC power flow equation, the amplitude and phase angle of the voltage at each node are diverged to obtain the Jacobian matrix for the power flow of the AC-DC system; From the Jacobian matrix, a block-by-block matrix that reflects the effect of node voltage amplitude on the reactive power injected by the node is extracted and inverted, and the sensitivity matrix of the node voltage to the reactive power injected by the node, that is, the A comprehensive control method for ensuring voltage stability in a multi-phase direct current system power recovery step, characterized by obtaining a sensitivity matrix of node voltage for reactive power. According to claim 1,
Building an optimization model of direct current effective power recovery constrained within a safe range by the amount of deviation of all node voltages is specifically,
The amount of power recovery for each time step of each DC system is taken as a determining variable; Maximization of the DC effective power recovery amount per time step is the optimization target; Constrain the equation of the sensitivity of the node voltage to the effective power transported in direct current by the equation; Comprehensive guaranteeing voltage stability in the multi-phase DC system power recovery step, characterized by constructing an optimization model of DC effective power recovery by constraining the voltage deviation amount per node within the safety range and the upper limit of DC system power recovery with an inequality. control method. According to claim 1,
Building an optimization model for the amount of reactive power device expansion aimed at square and minimizing the amount of node voltage deviation is specifically,
After completing the DC power recovery for each time step, the expansion amount of the reactive power compensator is taken as a determining variable; The square and minimum of the amount of node voltage deviation generated by DC power recovery are set as optimization targets; Constrain the sensitivity equation of the node voltage to the reactive power sent by the reactive power compensator by an equation; A comprehensive control method for ensuring voltage stability in a multi-phase DC system power recovery step, characterized in that the upper limit of the reactive power sent by the reactive power compensator is constrained by an inequality to build an optimization model for the amount of reactive power compensator expansion. According to claim 1,
Comprehensive control method for ensuring voltage stability in the multi-phase DC system power recovery step, characterized in that both the optimization model of the effective power recovery and the optimization model of the expansion amount of the reactive power compensator are implemented with the linear planning function of CPLEX. In a comprehensive control system that guarantees voltage stability in the power recovery phase of a multi-phase DC system,
A device used to construct power flow equations for AC-DC systems based on initial states per time step;
a device used to obtain a sensitivity matrix of node voltage for active power transported by the direct current system, and a device used for obtaining a sensitivity matrix for node voltage to reactive power sent by the reactive compensator;
an apparatus used to build an optimization model of DC effective power recovery constrained within a safe range by the amount of deviation of all node voltages according to a sensitivity matrix of node voltages for effective power transported in direct current; A device used to obtain the model and obtain an optimal recovery amount of effective power for each DC system under the premise of voltage safety for each time step;
A device used to build an optimization model for the amount of reactive power device expansion aimed at minimizing and squaring the amount of node voltage deviation based on the sensitivity matrix of the node voltage for the reactive power sent by the reactive power compensator; A device used to obtain a model and obtain an optimal amount of expansion for each invalid compensation device after DC power recovery for each time step is completed, so that node voltage deviation generated by DC power recovery is minimized. A comprehensive control system that guarantees voltage stability in the power recovery phase of a multi-phase DC system. In the terminal device,
It includes a processor and a computer readable storage medium, wherein the processor is used to implement each instruction; A computer-readable storage medium is used to store several commands, and the commands are loaded by a processor to ensure voltage stability in the multi-phase direct current system power recovery step according to any one of claims 1 to 7. A terminal device characterized in that it executes a control method. In the computer readable storage medium,
A plurality of commands are stored, and the commands are loaded by the processor of the terminal device to execute a comprehensive control method for ensuring voltage stability in the multi-phase DC system power recovery step according to any one of claims 1 to 7. Characterized by a computer readable storage medium.

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