WO2015081771A1 - Adaptive emergency control method for voltage security and stability based on synchronous measurement information - Google Patents

Abstract

An adaptive emergency control method for voltage security and stability based on synchronous measurement information. According to the method, based on synchronous measurement data of bus voltages and branch tidal currents collected in real time, an equation reflecting a correlation between a variation of the bus voltages and active and reactive variations of each bus load is established, and an optimization method is adopted to carry out simultaneous resolution of an equation set reflecting an incidence relation among a plurality of operating points of an actually measured operating trajectory to obtain the sensitivity, of injection of active and reactive power into each bus, to the bus voltage; in consideration of the priority and price of load control, and in controllable reactive device switching and a load control measure space, reactive device switching and load control measures that satisfy voltage security and stability requirements of each bus with the lowest control price are searched for. The method can implement coordination and optimization emergency control for preventing voltages from losing security and stability.

Description

基于同步测量信息的电压安全稳定自适应紧急控制方法Voltage safety stable adaptive emergency control method based on synchronous measurement information 技术领域Technical field

本发明属于电力***运行与控制领域，更准确地说本发明涉及一种基于同步测量信息的电压安全稳定自适应紧急控制方法。The invention belongs to the field of power system operation and control, and more particularly relates to a voltage safety and stability adaptive emergency control method based on synchronous measurement information.

背景技术Background technique

大规模电力的远距离输送、负荷中心电压支撑能力不足使得电压安全稳定成为电力***运行与控制中需要重点解决的问题之一。现有的电压安全稳定紧急控制技术包括两类，一类是基于预先制定控制策略表的紧急控制，例如区域安全稳定控制***；这类技术实时性和控制精度比较高，但无论是按离线策略表控制，还是按在线策略表控制，都难以避免因用于分析的运行方式与实际运行状态的差异过大而带来的过控问题和欠控问题，可靠性不高。另一类是基于就地测量实时信息的紧急控制，例如低压减载；该类技术可靠性和实时性比较高，但由于只有就地量，其控制精度很难保证。The long-distance transmission of large-scale power and the insufficient support capacity of the load center make voltage safety and stability become one of the key issues to be solved in the operation and control of power systems. The existing voltage safety and stability emergency control technologies include two types, one is emergency control based on a pre-established control strategy table, such as a regional security and stability control system; such technology has higher real-time and control accuracy, but whether it is an offline strategy The table control or the online policy table control is difficult to avoid the over-control problem and the under-control problem caused by the excessive difference between the operation mode and the actual operation state for analysis, and the reliability is not high. The other type is emergency control based on in-situ measurement of real-time information, such as low-voltage load shedding; such technology is highly reliable and real-time, but because of the local quantity, the control accuracy is difficult to guarantee.

发明内容Summary of the invention

本发明的目的是：为了综合提高电压安全稳定紧急控制的可靠性、实时性和精度，本发明提出只基于实时汇集的负荷中心变电站的母线电压和支路潮流同步测量数据，不依赖于电力***其它厂站的运行方式，不依赖于电力***模型和参数，直接建立反映母线电压变化量与各个母线负荷有功和无功变化量之间的关联方程，依据各个母线负荷有功和无功对母线电压的灵敏度在短时间内变化不大的特性，采用优化方法联立求解反映实测运行轨迹的多个运行点之间关联关系的方程组，得到各个母线负荷有功和无功对母线电压的灵敏度，再基于灵敏度，考虑可控措施及其优先级和代价，以及各母线的电压安全稳定要求，实现防止电压失去安全稳定的协调优化紧急控制。。The object of the present invention is: in order to comprehensively improve the reliability, real-time and accuracy of the voltage safety and stability emergency control, the present invention proposes that the bus voltage and the branch power flow synchronization measurement data of the load center substation based only on real-time aggregation are independent of the power system. The operation mode of other plant stations does not depend on the power system model and parameters, and directly establishes the correlation equation between the bus voltage variation and the active and reactive power variations of each bus load. According to each bus load, the active and reactive power to the bus voltage The sensitivity of the sensor does not change much in a short period of time. The optimization method is used to solve the equations that reflect the relationship between the multiple operating points of the measured trajectory, and the sensitivity of each bus load active and reactive to the bus voltage is obtained. Based on the sensitivity, consider the controllable measures and their priorities and costs, as well as the voltage safety and stability requirements of each busbar, to achieve coordinated and optimized emergency control to prevent the voltage from losing safety and stability. .

具体地说，本发明是采用以下的技术方案来实现的，包括以下步骤： Specifically, the present invention is implemented by the following technical solutions, including the following steps:

1)汇集基于同步测量的电压安全稳定监控设备集中所有母线的电压和支路潮流信息，并按设定的采样存储周期T₀存储这些信息，得到包括最新同步测量时刻t₀信息在内的实测历史信息，进入步骤2)；1) Combine the voltage and branch flow information of all bus bars in the voltage safety and stability monitoring device based on synchronous measurement, and store the information according to the set sampling storage period T _{0 to} obtain the measured information including the latest synchronous measurement time t ₀ information. Historical information, proceed to step 2);

2)若汇集的t₀时刻的电压安全稳定监控设备集中所有母线的电压都分别大于等于相应母线电压控制的计算启动门槛值或其中至少有1个母线的电压小于等于相应母线电压的故障状态门槛值，则返回步骤1)；若汇集的t₀时刻的电压安全稳定监控设备集中所有母线的电压都分别大于等于相应母线电压的紧急控制启动门槛值且其中至少有1个母线的电压小于相应母线电压控制的计算启动门槛值，则进入步骤3)；若汇集的t₀时刻的电压安全稳定监控设备集中所有母线的电压都分别大于相应母线电压的故障状态门槛值且其中至少有1个母线的电压小于相应母线电压的紧急控制启动门槛值，则将电压小于相应母线电压的紧急控制启动门槛值的母线过滤出来，构成电压待控母线集，进入步骤8)；2) If the voltages at the time t _{0 of the} collection are safe and stable, the voltages of all the bus bars in the centralized control device are respectively greater than or equal to the calculated starting threshold of the corresponding bus voltage control or the fault state threshold in which at least one bus voltage is less than or equal to the corresponding bus voltage. The value returns to step 1); if the collected voltages at time t ₀ are safely and stably monitored, the voltages of all the bus bars are respectively greater than or equal to the emergency control start threshold of the corresponding bus voltage, and at least one of the bus bars has a voltage less than the corresponding bus bar. If the calculation of the voltage control starts the threshold, the process proceeds to step 3); if the voltage at the time t _{0 is} collected, the voltages of all the bus bars in the centralized monitoring device are respectively greater than the fault state threshold of the corresponding bus voltage and at least one of the bus bars is included. If the voltage is less than the emergency control start threshold of the corresponding bus voltage, the bus bar whose voltage is less than the emergency control start threshold of the corresponding bus voltage is filtered out to form a voltage standby bus set, and proceeds to step 8);

所述母线电压控制的计算启动门槛值大于相应母线电压的紧急控制启动门槛值，母线电压的紧急控制启动门槛值大于相应母线电压的安全稳定临界值，母线电压的安全稳定临界值大于相应母线电压的故障状态门槛值；The calculation threshold value of the bus voltage control is greater than the emergency control start threshold of the corresponding bus voltage, and the emergency control threshold of the bus voltage is greater than the safety stability threshold of the corresponding bus voltage, and the safety stability threshold of the bus voltage is greater than the corresponding bus voltage. Fault state threshold value;

3)若汇集的实测历史信息所对应的时间长度T与设定的灵敏度计算采样周期T_s之比小于4，则返回步骤1)，否则将t₀时刻作为第1个采样时刻点，以T_s对实测历史信息进行采样，使得第2个采样时刻点为t₀-T_s时刻，第3个采样时刻点为t₀-2T_s时刻，第4个采样时刻点为t₀-3T_s时刻，第5个采样时刻点为t₀-4T_s时刻，进入步骤4)；3) If the ratio of the time length T corresponding to the collected measured history information to the set sensitivity calculation sampling period T _s is less than 4, return to step 1), otherwise the time t ₀ is taken as the first sampling time point, to T _s samples the measured history information so that the second sampling time point is t ₀ -T _s time, the third sampling time point is t ₀ -2T _s time, and the fourth sampling time point is t ₀ -3T _s time , the fifth sampling time point is t ₀ -4T _s time, proceeds to step 4);

其中，T_s设置为实测历史信息的采样存储周期T₀的整数倍；Where T _{s is} set to an integer multiple of the sampling storage period T ₀ of the measured historical information;

4)基于相邻的两个采样时刻点的母线电压和支路潮流同步测量信息，建立反映两个采样时刻点之间各个母线的电压变化量、负荷有功变化量、负荷及无功补偿设备总无功变化量与各个母线注入有功对母线电压的灵敏度、注入无功对母线电压的灵敏度以及电网中其它因素引起母线电压的变化量的关联方程组， 将各个母线注入有功对母线电压的灵敏度和注入无功对母线电压的灵敏度，以及在T_s内电网中其它因素引起母线电压的变化量作为变量，并假设在不同的两个相邻采样时刻点的关联方程组中，这些变量是相同的，采用优化方法联立求解4个反映相邻的两个采样时刻点运行状态之间关系的关联方程组；若有最优解且是唯一解，则将最优解作为相应的变量的最新解，并将t₀时刻作为最新解所关联的时刻t_r，进入步骤5)，否则，进入步骤5)；4) Based on the bus voltage and branch current synchronization measurement information of two adjacent sampling time points, establish a voltage variation, load active variation, load and reactive power compensation equipment for each bus bar between two sampling time points. The reactive power variation is related to the sensitivity of each busbar injection active to the bus voltage, the sensitivity of the injected reactive power to the bus voltage, and the related equations caused by other factors in the grid causing the variation of the bus voltage. The sensitivity of each busbar to the active bus voltage is The sensitivity of the injected reactive power to the bus voltage, and the amount of change in the bus voltage caused by other factors in the T _s as a variable, and assume that these variables are the same in the associated equations at two different sampling time points. The optimization method is used to solve the four correlation equations that reflect the relationship between the two adjacent sampling time points. If there is an optimal solution and is the only solution, the optimal solution is taken as the latest solution of the corresponding variable. And step t ₎ as the time t _r associated with the latest solution, proceeds to step 5), otherwise, proceeds to step 5);

5)若各个母线注入有功对母线电压的灵敏度和注入无功对母线电压的灵敏度，以及在T_s内电网中其它因素引起母线电压的变化量的解已获得、且t₀-t_r小于等于设定的灵敏度有效时间，则将汇集的t₀时刻的所有母线中电压小于相应母线电压的预决策控制门槛值的母线过滤出来，构成电压预决策控制母线集，对于电压预决策控制母线集非空的情况，进入步骤6)，对于电压预决策控制母线集为空的情况，返回步骤1)；5) If the sensitivity of each busbar injection active to the bus voltage and the sensitivity of the injected reactive power to the bus voltage, and the solution of the variation of the bus voltage caused by other factors in the grid in T _s have been obtained, and t ₀ -t _{r is} less than or equal to The set sensitivity time is filtered, and the bus bars of all the bus bars at the time t ₀ are less than the pre-decision control threshold of the corresponding bus voltage are filtered out to form a voltage pre-decision control bus set, and the voltage pre-decision control bus set is not Empty, go to step 6), for the voltage pre-decision control bus set is empty, return to step 1);

否则，返回步骤1)；Otherwise, return to step 1);

所述母线电压的预决策控制门槛值大于相应母线电压的紧急控制启动门槛值；The pre-decision control threshold value of the bus voltage is greater than an emergency control start threshold of the corresponding bus voltage;

6)将母线注入有功对母线电压的灵敏度大于设置的母线注入有功对母线电压的灵敏度门槛值且可控的母线负荷过滤出来，构成母线负荷控制措施集，将母线注入无功对母线电压的灵敏度大于设置的母线注入无功对母线电压的灵敏度门槛值且可控的母线负荷过滤出来，加入到母线负荷控制措施集，将母线注入无功对母线电压的灵敏度大于设置的母线注入无功对母线电压的灵敏度门槛值且可切除的母线并联电抗器和可投入的母线并联电容器过滤出来，构成母线无功补偿设备控制措施集，若母线负荷控制措施集非空或母线无功补偿设备控制措施集非空，进入步骤7)，否则，返回步骤1)；6) The sensitivity of the busbar injection active to the bus voltage is greater than the sensitivity threshold of the busbar injection active to the busbar voltage and the controllable busbar load is filtered out to form the busbar load control measure set, and the sensitivity of the busbar to the reactive busbar voltage is injected. Greater than the set busbar injection reactive power threshold voltage threshold and the control of the bus load is filtered out, added to the bus load control measures set, the busbar injection reactive power is more sensitive to the bus voltage than the set bus injection reactive bus to the bus The sensitivity threshold of the voltage and the resectable bus shunt reactor and the input bus shunt capacitor are filtered out to form the control set of the bus reactive power compensation device. If the bus load control measures are set, the non-empty or bus reactive power compensation device control measures are set. Non-empty, proceed to step 7), otherwise, return to step 1);

所述可控的母线负荷是指连接到该母线的可控的负荷支路；The controllable bus load refers to a controllable load branch connected to the bus bar;

7)建立以切负荷的控制代价最小为目标函数，考虑不同切负荷措施的控制 优先级、负荷转供和切负荷措施中有功与无功是一体的、以及负荷转供、切负荷和投退无功补偿设备后满足电压预决策控制母线集中各个母线电压的增量大于等于相应母线电压的紧急控制启动门槛值与其电压安全稳定临界值之差的约束条件的01整数规划模型，通过求解01整数规划模型来计算电压安全稳定预决策紧急控制措施；7) Establish a minimum of the control cost of the load shedding as the objective function, and consider the control of different load shedding measures. In the priority, load transfer and load shedding measures, the active and reactive power are integrated, and the load transfer, load shedding and returning reactive power compensation equipment meets the voltage pre-decision control. The increment of each bus voltage in the bus bar is greater than or equal to the corresponding value. The 01 integer programming model of the constraint of the difference between the threshold voltage of the emergency control of the bus voltage and the voltage safety stability threshold is calculated by solving the 01 integer programming model to calculate the voltage safety and stability pre-decision emergency control measures;

若能够得到最优解，则将与其中任一最优解相应的负荷转供措施、切负荷措施与投退无功补偿设备措施作为最新的电压安全稳定预决策紧急控制措施，并将电压预决策控制母线集和t₀时刻作为最新的电压安全稳定预决策紧急控制措施所关联的电压预决策控制母线集和时刻t_c，再返回步骤1)，否则返回步骤1)；If the optimal solution can be obtained, the load transfer measures, load shedding measures and retreat reactive power compensation equipment measures corresponding to any of the optimal solutions are taken as the latest voltage safety and stability pre-decision emergency control measures, and the voltage is pre-empted. Decision control bus set and time t ₀ as the latest voltage safety and stability pre-decision emergency control measures associated with the voltage pre-decision control bus set and time t _c , then return to step 1), otherwise return to step 1);

8)若最新的电压安全稳定预决策紧急控制措施已获得、且t₀-t_c小于等于设定的预决策紧急控制措施的有效时间，则对于最新的电压安全稳定预决策紧急控制措施所关联的电压预决策控制母线集与电压待控母线集的交集非空的情况，将最新的电压安全稳定预决策紧急控制措施直接实施，返回步骤1)，对于最新的电压安全稳定预决策紧急控制措施所关联的电压预决策控制母线集与电压待控母线集的交集是空集的情况，返回步骤1)；否则，返回步骤1)。8) If the latest voltage safety and stability pre-decision emergency control measures have been obtained, and t ₀ -t _{c is} less than or equal to the effective time of the set pre-decision emergency control measures, it is associated with the latest voltage safety and stability pre-decision emergency control measures. The voltage pre-decision control bus set and the voltage standby bus set intersection are not empty, the latest voltage safety and stability pre-decision emergency control measures are directly implemented, return to step 1), for the latest voltage safety and stability pre-decision emergency control measures If the intersection of the associated voltage pre-decision control bus set and the voltage standby bus set is an empty set, return to step 1); otherwise, return to step 1).

上述技术方案的进一步特征在于，在步骤4)中分别通过方程组(1)-(4)来表示从第1个采样时刻点开始，相邻的2个采样时刻点之间各个母线的电压变化量、负荷有功变化量、负荷及无功补偿设备总无功变化量与各个母线注入有功对母线电压的灵敏度、注入无功对母线电压的灵敏度以及电网中其它因素引起母线电压的变化量的关系，有功、无功都以流入母线为正：The above technical solution is further characterized in that in step 4), the voltage changes of the respective bus bars between the adjacent two sampling time points from the first sampling time point are respectively represented by the equations (1)-(4). The relationship between quantity, load active change, total reactive power variation of load and reactive power compensation equipment, sensitivity of each busbar active active to bus voltage, sensitivity of injection reactive power to bus voltage, and variation of bus voltage caused by other factors in the grid Positive and reactive power are positively flowing into the busbar:

其中，n为电压的同步测量信息中母线的个数，m为负荷的同步测量信息中母线的个数，M为无功的同步测量信息中母线的个数，在求解方程组(1)-(4)之前，需要将同步测量信息中所有负荷的母线排在前面，没有负荷、只有无功补偿设备的母线排在后面，v_0.i、v_1.i、v_2.i、v_3.i和v_4.i分别为第1至第5个采样时刻点电压安全稳定监控设备集中第i个母线的电压，λ_P.i.j、λ_Q.i.j分别为电压安全稳定监控设备集中第j个母线的注入有功对第i个母线电压的灵敏度和注入无功对第i个母线电压的灵敏度，P_0.j、P_1.j、P_2.j、P_3.j和P_4.j分别为第1至第5个采样时刻点电压安全稳定监控设备集中第j个母线同步测量信息中负荷的总有功，Q_0.j、Q_1.j、Q_2.j、Q_3.j和Q_4.j分别为第1至第5个采样时刻点电压安全稳定监控设备集中第j个母线同步测量信息中负荷与无功补偿设备的总无功，ΔV_i为电网中其它因素引起电压安全稳定监控设备集中第i个母线电压的变化量；Where n is the number of busbars in the synchronous measurement information of the voltage, m is the number of busbars in the synchronous measurement information of the load, and M is the number of busbars in the synchronous measurement information of reactive power, in solving the equations (1)- before (4), the measurement information need to synchronize all of the top surface of the bus load, no load, only the reactive power compensation device at the back of the _{bus, v 0.i, v 1.i, v} 2.i, v 3 _.i and v _4.i are the voltages of the i-th busbar in the voltage safety and stability monitoring equipment in the first to fifth sampling time points respectively, and λ _Pij and λ _Qij are the injections of the jth busbar in the voltage safety and stability monitoring equipment. The sensitivity of the active to the i-th bus voltage and the sensitivity of the injected reactive power to the i-th bus voltage, P _0.j , P _1.j , P _2.j , P _3.j and P _4.j are respectively the first The total active power of the load in the jth bus synchronous measurement information in the voltage safety and stability monitoring equipment to the 5th sampling time point, Q _0.j , Q _1.j , Q _2.j , Q _3.j and Q _4.j The total reactive power of the load and reactive power compensation equipment in the j-th bus synchronous measurement information of the voltage safety and stability monitoring equipment in the 1st to 5th sampling time points respectively _I [Delta] V due to voltage stability monitoring device for the safety grid and other factors change amount of the i-th focus bus voltage;

通过优化方法求解公式(5)来计算λ_P.i.j、λ_Q.i.j和ΔV_i： Calculate λ _Pij , λ _Qij and ΔV _i by solving the formula (5) by the optimization method:

上述技术方案的进一步特征在于，在步骤7)中通过求解以公式(6)表示目标函数、以公式(7)表示约束条件的01整数规划模型，来计算电压安全稳定预决策紧急控制措施，有功、无功都以流入母线为正：The above technical solution is further characterized in that in step 7), an emergency control measure for voltage safety and stability pre-decision is calculated by solving a 01 integer programming model in which the objective function is represented by the formula (6) and the constraint condition is represented by the formula (7). Reactive power is positive in the incoming bus:

其中，R为母线负荷控制措施集中切除负荷支路的优先级数，D_r为母线负荷控制措施集中优先级为r的可切负荷支路数，r越大，优先级越高，越优先切除，x_r.d取值为0或1，等于0表示不切除该负荷，等于1表示切除该负荷，当x_r+1.d 等于0时，x_r.d只能等于0，当x_r+1.d等于1时，x_r.d可以等于0，也可以等于1，P_E.r.0.d、Q_E.r.0.d分别为t₀时刻优先级为r的可切负荷支路中第d个负荷支路的有功和无功，C_r.0.d为t₀时刻切除优先级为r的负荷支路中第d个负荷支路的控制代价，K为电压预决策控制母线集中母线数，

分别为优先级为r的可切负荷支路中第d个负荷支路所连接的电压安全稳定监控设备集中第k₀个母线的注入有功对电压预决策控制母线集中第k个母线电压的灵敏度和注入无功对电压预决策控制母线集中第k个母线电压的灵敏度；Where R is the priority number of the bus load control measures to cut off the load branch collectively, and D _r is the number of loadable branches with the priority of the bus load control measures being r. The larger the r, the higher the priority and the higher the priority , x _rd takes a value of 0 or 1, equal to 0 means not to remove the load, equal to 1 means to cut off the load, when x _r+1.d is equal to 0, x _rd can only be equal to 0, when x _r+1.d When it is equal to 1, x _rd can be equal to 0 or equal to 1, and P _Er0.d and Q _Er0.d are the active and non-active of the d-th load branch in the load- _cutable branch with priority r at time t ₀ respectively. Work, C _r.0.d is the control cost of the d-th load branch in the load branch with the priority r being cut off at time t ₀ , and K is the number of bus bars in the voltage pre-decision control bus bar.

Priority are safe and stable voltage centralized monitoring device of busbars k ₀ r may be injected as a load shedding d th branch connected branches active load voltage control bus pre-centralized decision k-th bus voltage sensitivity And the sensitivity of the injected reactive power to the voltage of the kth bus voltage in the voltage pre-determination control bus set;

L为母线负荷控制措施集中可转供负荷支路数，

分别为其中第l个可转供负荷支路在转供前所连接的电压安全稳定监控设备集中第k₁个母线的注入有功对电压预决策控制母线集中第k个母线电压的灵敏度和注入无功对电压预决策控制母线集中第k个母线电压的灵敏度，

分别为其中第l个可转供负荷支路在转供后所连接的电压安全稳定监控设备集中第k₂个母线的注入有功对电压预决策控制母线集中第k个母线电压的灵敏度和注入无功对电压预决策控制母线集中第k个母线电压的灵敏度，P_F.0.l、Q_F.0.l分别为t₀时刻其中第l个可转供负荷支路的有功和无功，x_l取值为0或1，等于0表示不转供该负荷支路，等于1表示转供该负荷支路；L is the number of load branches that can be transferred to the bus load control measures.

Respectively, where k ₁ -th centralized bus l-th injection can be transferred for a load branch is connected in turn supply voltage before the security and stability of the active monitoring device for voltage control bus pre-centralized decision k-th bus voltage sensitivity and without injection The sensitivity of the power to the voltage pre-decision control to the kth bus voltage in the bus set,

Respectively, wherein the l th rotatable safe and stable supply voltage monitoring device for the load branch after the transfer of the connected busbars k ₂ concentration of the injection of active voltage control bus pre-centralized decision k-th bus voltage sensitivity and without injection The sensitivity of the work to the voltage pre-decision control bus bar voltage of the kth bus bar concentration, P _F.0.l , Q _F.0.l are the active and reactive power of the lth transferable load branch at time t ₀ respectively. The value of x _l is 0 or 1, equal to 0 means no transfer to the load branch, and equal to 1 means transfer to the load branch;

A为母线无功补偿设备控制措施集中可切除的并联电抗器支路数，

为其中第a个并联电抗器所连接的电压安全稳定监控设备集中第k₃个母线的注入无功对电压预决策控制母线集中第k个母线电压的灵敏度，Q_G.0.a为t₀时刻其中第a个并联电抗器切除的无功，y_a取值为0或1，等于0表示不切除该并联电抗器支路，等于1表示切除该并联电抗器支路；A is the busbar reactive power compensation device control measures, the number of shunt reactor branches that can be cut off,

Wherein the sensitivity of the voltage monitoring device of a safe and stable parallel connected reactors k ₃ concentration of the bus bars injecting reactive voltage control bus pre-decision on the k-th concentration bus _voltage, Q G.0.a to t ₀ At the moment, the reactive power of the a-th parallel reactor is cut off, y _a takes _a value of 0 or 1, equal to 0 means that the shunt reactor branch is not cut off, and equal to 1 means that the shunt reactor branch is cut off;

B为母线无功补偿设备控制措施集中可投入的并联电容器支路数，

为其中第b个并联电容器所连接的电压安全稳定监控设备集中第k₄个母线的注入无功对电压预决策控制母线集中第k个母线电压的灵敏度，Q_H.0.b为t₀时刻其中第 b个并联电容器投入后的无功，采用并联电容器投入的容抗及相连的母线在t₀时刻的电压来计算，z_b取值为0或1，等于0表示不投入该并联电容器支路，等于1表示投入该并联电容器支路；B is the number of shunt capacitor branches that can be invested in the control measures of the bus reactive power compensation equipment.

Voltage stability in which the security monitoring device b th capacitors connected in parallel to k ₄ th concentration of injecting reactive bus voltage control bus pre-decision on the k-th concentration sensitivity bus _voltage, Q H.0.b to time t ₀ The reactive power after the input of the b-th parallel capacitor is calculated by the capacitive reactance of the parallel capacitor input and the voltage of the connected bus bar at time t _{0. The} value of z _b is 0 or 1, and equal to 0 means that the parallel capacitor branch is not input. Road, equal to 1 means to input the shunt capacitor branch;

v_s.k、v_c.k分别为t₀时刻电压预决策控制母线集中第k个母线的电压安全稳定临界值和紧急控制启动门槛值。v _sk and v _ck are respectively the voltage safety stability threshold and the emergency control threshold of the kth bus in the voltage pre-decision control bus set at time t ₀ .

本发明的有益效果如下：本发明提出了只基于实时汇集的母线电压和支路潮流同步测量数据，不依赖于电力***其它厂站的运行方式，不依赖于电力***模型和参数，与采用预先计算的控制策略表进行紧急控制的技术相比，提高了电压安全稳定紧急控制的可靠性。通过建立反映母线电压变化量与各个母线负荷有功和无功变化量之间的关联方程，依据各个母线负荷有功和无功对母线电压的灵敏度在短时间内变化不大的特性，采用优化方法联立求解反映实测运行轨迹的多个运行点之间关联关系的方程组，得到各个母线负荷有功和无功对母线电压的灵敏度，考虑负荷控制的优先级和代价，在可控的无功设备投切和负荷控制措施空间中，搜索满足各个母线电压安全稳定要求且控制代价最小的无功设备投切和负荷控制措施，与基于就地量控制的技术相比，降低了电压安全稳定紧急控制的代价，提高了控制精度。本发明依据实时检测到的母线电压低于其电压安全稳定紧急控制启动门槛值，再通过对预决策控制措施的适应性校核后，对电力***实施紧急控制，较好地实现可靠性和实时性之间的平衡。总之，本发明提高了电压安全稳定紧急控制的可靠性、实时性和精度的综合性能，可实现防止电压失去安全稳定的协调优化紧急控制。The beneficial effects of the present invention are as follows: The present invention proposes a bus voltage and branch current synchronization measurement data based only on real-time aggregation, does not depend on the operation mode of other power stations of the power system, does not depend on the power system model and parameters, and adopts the advance The calculated control strategy table improves the reliability of the voltage safety and stability emergency control compared to the technology for emergency control. By establishing a correlation equation reflecting the variation of the bus voltage and the active and reactive power variations of each bus load, according to the characteristics that the sensitivity of each bus load active and reactive power to the bus voltage does not change much in a short time, an optimization method is used. Solve the equations that reflect the relationship between the multiple operating points of the measured trajectory, obtain the sensitivity of each bus load active and reactive power to the bus voltage, consider the priority and cost of the load control, and control the reactive power equipment. In the space of cutting and load control measures, searching for reactive power equipment switching and load control measures that meet the safety and stability requirements of each bus voltage and having the lowest control cost, compared with the technology based on local quantity control, the voltage safety and stability emergency control is reduced. The cost increases the control accuracy. The invention is based on the real-time detected bus voltage lower than the voltage safety and stability emergency control starting threshold value, and then through the adaptive check of the pre-decision control measures, the emergency control of the power system is implemented, and the reliability and real-time are better realized. The balance between sex. In summary, the present invention improves the reliability, real-time performance and accuracy of the voltage safety and stability emergency control, and can realize coordinated and optimized emergency control to prevent the voltage from losing safety and stability.

附图说明DRAWINGS

图1为本发明方法的步骤1至步骤6的流程图。Figure 1 is a flow chart of steps 1 through 6 of the method of the present invention.

图2为本发明方法的步骤7至步骤8的流程图。Figure 2 is a flow chart of steps 7 through 8 of the method of the present invention.

具体实施方式Detailed ways

下面参照附图并结合实例对本发明作进一步详细描述。 The present invention will be further described in detail below with reference to the accompanying drawings in conjunction with examples.

图1中步骤1描述的是，汇集基于同步测量的电压安全稳定监控设备集中所有母线的电压和支路潮流信息，并按设定的采样存储周期T₀存储这些信息，得到包括最新同步测量时刻t₀信息在内的实测历史信息，进入步骤2)。步骤1)的目的是用于获取新的同步测量信息，以备下述步骤进行控制决策计算。其中，T₀可设置为0.02s。Step 1 in FIG. 1 describes that the voltage and branch flow information of all the bus bars in the voltage safety and stability monitoring device based on the synchronous measurement are collected, and the information is stored according to the set sampling storage period T _{0 to} obtain the latest synchronous measurement time. The measured historical information including the t ₀ information proceeds to step 2). The purpose of step 1) is to obtain new synchronization measurement information in preparation for the control decision calculation. Among them, T ₀ can be set to 0.02s.

图1中步骤2描述的是，若汇集的t₀时刻的电压安全稳定监控设备集中所有母线的电压都分别大于等于相应母线电压控制的计算启动门槛值或其中至少有1个母线的电压小于等于相应母线电压的故障状态门槛值(通常可设置为0.6p.u)，则返回步骤1)；若汇集的t₀时刻的电压安全稳定监控设备集中所有母线的电压都分别大于等于相应母线电压的紧急控制启动门槛值且其中至少有1个母线的电压小于相应母线电压控制的计算启动门槛值，则进入步骤3)；若汇集的t₀时刻的电压安全稳定监控设备集中所有母线的电压都分别大于相应母线电压的故障状态门槛值且其中至少有1个母线的电压小于相应母线电压的紧急控制启动门槛值，则将电压小于相应母线电压的紧急控制启动门槛值的母线过滤出来，构成电压待控母线集，进入步骤8)。Step 2 in Figure 1 describes that if the voltages at the time t _{0 are} collected, the voltages of all the bus bars in the centralized monitoring device are respectively greater than or equal to the calculated starting threshold of the corresponding bus voltage control or the voltage of at least one of the bus bars is less than or equal to The fault state threshold value of the corresponding bus voltage (usually set to 0.6 pu) returns to step 1); if the voltage at the time t _{0 is} collected, the voltage of all the bus bars in the centralized monitoring device is equal to or greater than the emergency control of the corresponding bus voltage. start threshold and wherein at least voltage of a bus bar less than the calculated start threshold corresponding bus voltage control proceeds to step 3); if the voltage safe and stable monitoring device pooled time t ₀ focus voltage of all buses are respectively greater than the corresponding The threshold value of the fault voltage of the bus voltage and wherein at least one bus voltage is less than the emergency control start threshold of the corresponding bus voltage, the bus bar whose voltage is less than the emergency control start threshold of the corresponding bus voltage is filtered out to form a voltage standby bus Set, go to step 8).

所述母线电压控制的计算启动门槛值大于相应母线电压的紧急控制启动门槛值，母线电压的紧急控制启动门槛值大于相应母线电压的安全稳定临界值，母线电压的安全稳定临界值大于相应母线电压的故障状态门槛值；各个母线电压的安全稳定临界值可以通过离线分析整定，也可以通过在线计算整定。通常电压安全稳定监控设备集中第i个母线电压控制的计算启动门槛值可以设为1.09v_s.i(其中v_s.i为电压安全稳定监控设备集中第i个母线电压的安全稳定临界值)，紧急控制启动门槛值可以设为1.04v_s.i，故障状态门槛值可以设为0.5v_s.i。 The calculation threshold value of the bus voltage control is greater than the emergency control start threshold of the corresponding bus voltage, and the emergency control threshold of the bus voltage is greater than the safety stability threshold of the corresponding bus voltage, and the safety stability threshold of the bus voltage is greater than the corresponding bus voltage. The threshold value of the fault state; the safety and stability threshold of each bus voltage can be set by off-line analysis or can be determined by online calculation. Generally, the calculation threshold of the i-th bus voltage control in the voltage safety and stability monitoring equipment can be set to 1.09v _si (where v _si is the safety stability threshold of the i-th bus voltage in the voltage safety and stability monitoring equipment), and the emergency control starts. The threshold can be set to 1.04v _si and the fault state threshold can be set to 0.5v _si .

图1中步骤3描述的是，若汇集的实测历史信息所对应的时间长度T与设定的灵敏度计算采样周期T_s之比小于4，则返回步骤1)，否则，将t₀时刻作为第1个采样时刻点，以T_s对实测历史信息进行采样，使得第2个采样时刻点为t₀-T_s时刻，第3个采样时刻点为t₀-2T_s时刻，第4个采样时刻点为t₀-3T_s时刻，第5个采样时刻点为t₀-4T_s时刻，进入步骤4)。Step 3 in FIG. 1 describes that if the ratio of the time length T corresponding to the collected measured history information to the set sensitivity calculation sampling period T _s is less than 4, the process returns to step 1), otherwise, the time t ₀ is taken as the first At one sampling time point, the measured historical information is sampled by T _s such that the second sampling time point is t ₀ -T _s time, the third sampling time point is t ₀ -2T _s time, and the fourth sampling time The point is t ₀ -3T _s , and the 5th sampling time point is t ₀ -4T _s , and the process proceeds to step 4).

其中，T_s设置为实测历史信息的采样存储周期T₀的整数倍，通常可将T_s设置为2T₀；Wherein, T _S is set to the measured sample history information storing integer multiple of the period T _0, T _S can typically be set to 2T _0;

图1中步骤4描述的是，基于相邻的两个采样时刻点的母线电压和支路潮流同步测量信息，建立反映两个采样时刻点之间各个母线的电压变化量、负荷有功变化量、负荷及无功补偿设备总无功变化量与各个母线注入有功对母线电压的灵敏度、注入无功对母线电压的灵敏度以及电网中其它因素引起母线电压的变化量的关联方程组，将各个母线注入有功对母线电压的灵敏度和注入无功对母线电压的灵敏度，以及在T_s内电网中其它因素引起母线电压的变化量作为变量，并假设在不同的两个相邻采样时刻点的关联方程组中，这些变量是相同的，采用优化方法联立求解4个反映相邻的两个采样时刻点运行状态之间关系的关联方程组，若有最优解且是唯一解，则将最优解作为相应的变量的最新解，并将t₀时刻作为最新解所关联的时刻t_r，进入步骤5)，否则，进入步骤5)。Step 4 in FIG. 1 describes that, based on the bus voltage and the branch current synchronization measurement information of two adjacent sampling time points, the voltage variation and the load active variation of each bus bar between the two sampling time points are established. The total reactive power variation of the load and reactive power compensation equipment and the sensitivity of each busbar injection active to the bus voltage, the sensitivity of the injected reactive power to the bus voltage, and the related equations caused by other factors in the grid causing the variation of the bus voltage, and the respective busbars are injected. The sensitivity of the active to the bus voltage and the sensitivity of the injected reactive power to the bus voltage, as well as the variation of the bus voltage caused by other factors in the grid within T _s as variables, and the associated equations at different two adjacent sampling moments In the above, these variables are the same. The optimization method is used to solve the four correlation equations that reflect the relationship between the two adjacent sampling time points. If there is an optimal solution and is the only solution, the optimal solution will be obtained. the latest solutions as respective variables, and time t ₀ as the time associated with the latest solutions t _r, proceeds to step 5) otherwise, operation proceeds to step 5).

在步骤4)中分别通过方程组(1)-(4)来表示从第1个采样时刻点开始，相邻的2个采样时刻点之间各个母线的电压变化量、负荷有功变化量、负荷及无功补偿设备总无功变化量与各个母线注入有功对母线电压的灵敏度、注入无功对母线电压的灵敏度以及电网中其它因素引起母线电压的变化量的关系，有功、无功都以流入母线为正： In step 4), the equations (1)-(4) respectively indicate the voltage change amount, the load active change amount, and the load of each bus bar between the adjacent two sampling time points from the first sampling time point. And the total reactive power variation of the reactive power compensation device and the sensitivity of each busbar injection active to the bus voltage, the sensitivity of the injected reactive power to the bus voltage, and the variation of the bus voltage caused by other factors in the power grid, both active and reactive The busbar is positive:

其中，n为电压的同步测量信息中母线的个数，m为负荷的同步测量信息中母线的个数，M为无功的同步测量信息中母线的个数，在求解方程组(1)-(4)之前，需要将同步测量信息中所有负荷的母线排在前面，没有负荷、只有无功补偿设备的母线排在后面，v_0.i、v_1.i、v_2.i、v_3.i和v_4.i分别为第1至第5个采样时刻点电压安全稳定监控设备集中第i个母线的电压，λ_P.i.j、λ_Q.i.j分别为电压安全稳定监控设备集中第j个母线的注入有功对第i个母线电压的灵敏度和注入无功对第i个母线电压的灵敏度，P_0.j、P_1.j、P_2.j、P_3.j和P_4.j分别为第1至第5个采样时刻点电压安全稳定监控设备集中第j个母线同步测量信息中负荷的总有功，Q_0.j、Q_1.j、Q_2.j、Q_3.j和Q_4.j分别为第1至第5个采样时刻点电压安全稳定监控设备集中第j个母线同步测量信息中负荷与无功补偿设备的总无功，ΔV_i为电网中其它因 素引起电压安全稳定监控设备集中第i个母线电压的变化量。Where n is the number of busbars in the synchronous measurement information of the voltage, m is the number of busbars in the synchronous measurement information of the load, and M is the number of busbars in the synchronous measurement information of reactive power, in solving the equations (1)- before (4), the measurement information need to synchronize all of the top surface of the bus load, no load, only the reactive power compensation device at the back of the _{bus, v 0.i, v 1.i, v} 2.i, v 3 _.i and v _4.i are the voltages of the i-th busbar in the voltage safety and stability monitoring equipment in the first to fifth sampling time points respectively, and λ _Pij and λ _Qij are the injections of the jth busbar in the voltage safety and stability monitoring equipment. The sensitivity of the active to the i-th bus voltage and the sensitivity of the injected reactive power to the i-th bus voltage, P _0.j , P _1.j , P _2.j , P _3.j and P _4.j are respectively the first The total active power of the load in the jth bus synchronous measurement information in the voltage safety and stability monitoring equipment to the 5th sampling time point, Q _0.j , Q _1.j , Q _2.j , Q _3.j and Q _4.j The total reactive power of the load and reactive power compensation equipment in the j-th bus synchronous measurement information of the voltage safety and stability monitoring equipment in the 1st to 5th sampling time points respectively Causing a voltage [Delta] V _i centralized monitoring device safe and stable variation of the i-th grid bus voltage for other factors.

通过优化方法求解公式(5)来计算λ_P.i.j(其中，i＝1，2，…，n；j＝1，2，…，m)、λ_Q.i.j(其中，i＝1，2，…，n；j＝1，2，…，M)和ΔV_i(其中，i＝1，2，…，n)。Calculate λ _Pij (where i = 1, 2, ..., n; j = 1, 2, ..., m), λ _Qij (where i = 1, 2, ..., n) by solving the formula (5) by an optimization method ;j=1,2,...,M) and ΔV _i (where i=1, 2, . . . , n).

图1中步骤5描述的是，若各个母线注入有功对母线电压的灵敏度和注入无功对母线电压的灵敏度，以及在T_s内电网中其它因素引起母线电压的变化量的解已获得、且t₀-t_r小于等于设定的灵敏度有效时间(通常可设为0.3s)，则将汇集的t₀时刻的所有母线中电压小于相应母线电压的预决策控制门槛值的母线过滤出来，构成电压预决策控制母线集，对于电压预决策控制母线集非空的情况，进入步骤6)，对于电压预决策控制母线集为空的情况，返回步骤1)；否则，返回步骤1)。Step 5 in Figure 1 describes the sensitivity of the active bus to the bus voltage and the sensitivity of the injected reactive power to the bus voltage, and the solution of the change in the bus voltage caused by other factors in the grid within T _s has been obtained, and If t ₀ -t _{r is} less than or equal to the set sensitivity effective time (usually set to 0.3s), the bus bars of all the bus bars at the time t ₀ at which the voltage is less than the pre-decision control threshold of the corresponding bus voltage are filtered out. The voltage pre-decision control bus set, for the case where the voltage pre-decision control bus set is not empty, proceeds to step 6), and returns to step 1) if the voltage pre-decision control bus set is empty; otherwise, returns to step 1).

所述母线电压的预决策控制门槛值大于相应母线电压的紧急控制启动门槛值，通常电压安全稳定监控设备集中第i个母线电压的预决策控制门槛值可以设为1.06v_s.i(其中v_s.i为电压安全稳定监控设备集中第i个母线电压的安全稳定临界值)。The pre-decision control threshold value of the bus voltage is greater than the emergency control start threshold of the corresponding bus voltage. Generally, the pre-decision control threshold of the i-th bus voltage in the voltage safety and stability monitoring device can be set to 1.06v _si (where v _si is The voltage safety and stability monitoring equipment concentrates the safety stability threshold of the i-th bus voltage.

图1中步骤6描述的是，将母线注入有功对母线电压的灵敏度大于设置的 母线注入有功对母线电压的灵敏度门槛值且可控的母线负荷过滤出来，构成母线负荷控制措施集，将母线注入无功对母线电压的灵敏度大于设置的母线注入无功对母线电压的灵敏度门槛值且可控的母线负荷过滤出来，加入到母线负荷控制措施集，将母线注入无功对母线电压的灵敏度大于设置的母线注入无功对母线电压的灵敏度门槛值且可切除的母线并联电抗器和可投入的母线并联电容器过滤出来，构成母线无功补偿设备控制措施集，若母线负荷控制措施集非空或母线无功补偿设备控制措施集非空，进入步骤7)，否则，返回步骤1)。Step 6 in Figure 1 describes that the sensitivity of injecting the bus into active power to the bus voltage is greater than the setting. The busbar injects the active threshold value of the busbar voltage and the controllable busbar load is filtered out to form a busbar load control measure set. The sensitivity of the busbar injection reactive power to the busbar voltage is greater than the sensitivity of the set busbar injection reactive power to the busbar voltage. The controllable bus load is filtered out and added to the bus load control measure set. The sensitivity of the bus line injection reactive power to the bus voltage is greater than the sensitivity of the set bus bar injection reactive power to the bus voltage and the resectable bus shunt reactor and The busbar shunt capacitors that can be input are filtered out to form a busbar reactive power compensation device control measure set. If the busbar load control measures set non-empty or busbar reactive power compensation device control measures are not empty, go to step 7), otherwise, return to step 1) .

所述可控的母线负荷是指连接到该母线的可控的负荷支路。The controllable bus load refers to a controllable load branch connected to the bus.

图1中步骤7描述的是，建立以切负荷的控制代价最小为目标函数，考虑不同切负荷措施的控制优先级、负荷转供和切负荷措施中有功与无功是一体的、以及负荷转供、切负荷和投退无功补偿设备后满足电压预决策控制母线集中各个母线电压的增量大于等于相应母线电压的紧急控制启动门槛值与其电压安全稳定临界值之差的约束条件的01整数规划模型，通过求解01整数规划模型来计算电压安全稳定预决策紧急控制措施，若能够得到最优解，则将与其中任一最优解相应的负荷转供措施、切负荷措施与投退无功补偿设备措施作为最新的电压安全稳定预决策紧急控制措施，并将电压预决策控制母线集和t₀时刻作为最新的电压安全稳定预决策紧急控制措施所关联的电压预决策控制母线集和时刻t_c，返回步骤1)，否则，返回步骤1)。Step 7 in Figure 1 describes the establishment of the objective control function with the minimum control cost of the load shedding, considering the control priority of different load shedding measures, the active and reactive power in the load transfer and load shedding measures, and the load transfer. After the supply, load shedding and retreat reactive power compensation equipment meet the voltage pre-decision control bus bar concentration of each bus voltage increase is greater than or equal to the corresponding bus voltage emergency control threshold value and its voltage safety stability threshold value of the constraints of the 01 integer The planning model calculates the voltage safety and stability pre-decision emergency control measures by solving the 01 integer programming model. If the optimal solution can be obtained, the load transfer measures, load shedding measures and retreats corresponding to any of the optimal solutions will be The power compensation equipment measures as the latest voltage safety and stability pre-decision emergency control measures, and the voltage pre-decision control bus set and t ₀ time as the latest voltage safety and stability pre-decision emergency control measures associated with the voltage pre-decision control bus set and time t _c , return to step 1), otherwise, return to step 1).

在步骤7)中通过求解以公式(6)表示目标函数、以公式(7)表示约束条件的01整数规划模型，来计算电压安全稳定预决策紧急控制措施，有功、无功都以流入母线为正：In step 7), the emergency control measures for voltage safety and stability pre-decision are calculated by solving the 01 integer programming model with the objective function represented by equation (6) and the constraint condition represented by formula (7). The active and reactive powers are all flowed into the bus. positive:

其中，R为母线负荷控制措施集中切除负荷支路的优先级数，D_r为母线负荷控制措施集中优先级为r的可切负荷支路数，r越大，优先级越高，越优先切除，x_r.d取值为0或1，等于0表示不切除该负荷，等于1表示切除该负荷，当x_r+1.d等于0时，x_r.d只能等于0，当x_r+1.d等于1时，x_r.d可以等于0，也可以等于1，P_E.r.0.d、Q_E.r.0.d分别为t₀时刻优先级为r的可切负荷支路中第d个负荷支路的有功和无功，C_r.0.d为t₀时刻切除优先级为r的负荷支路中第d个负荷支路的控制代价，K为电压预决策控制母线集中母线数，

分别为优先级为r的可切负荷支路中第d个负荷支路所连接的电压安全稳定监控设备集中第k₀个母线的注入有功对电压预决策控制母线集中第k个母线电压的灵敏度和注入无功对电压预决策控制母线集中第k个母线电压的灵敏度；Where R is the priority number of the bus load control measures to cut off the load branch collectively, and D _r is the number of loadable branches with the priority of the bus load control measures being r. The larger the r, the higher the priority and the higher the priority , x _rd takes a value of 0 or 1, equal to 0 means not to remove the load, equal to 1 means to cut off the load, when x _r+1.d is equal to 0, x _rd can only be equal to 0, when x _r+1.d When it is equal to 1, x _rd can be equal to 0 or equal to 1, and P _Er0.d and Q _Er0.d are the active and non-active of the d-th load branch in the load- _cutable branch with priority r at time t ₀ respectively. Work, C _r.0.d is the control cost of the d-th load branch in the load branch with the priority r being cut off at time t ₀ , and K is the number of bus bars in the voltage pre-decision control bus bar.

Priority are safe and stable voltage centralized monitoring device of busbars k ₀ r may be injected as a load shedding d th branch connected branches active load voltage control bus pre-centralized decision k-th bus voltage sensitivity And the sensitivity of the injected reactive power to the voltage of the kth bus voltage in the voltage pre-determination control bus set;

L为母线负荷控制措施集中可转供负荷支路数，

分别为其中第l个可转供负荷支路在转供前所连接的电压安全稳定监控设备集中第k₁个母线的注入有功对电压预决策控制母线集中第k个母线电压的灵敏度和注入无功对电压预决策控制母线集中第k个母线电压的灵敏度，

分别为其中第l个可转供负荷支路在转供后所连接的电压安全稳定监控设备集中第k₂个母线的注入 有功对电压预决策控制母线集中第k个母线电压的灵敏度和注入无功对电压预决策控制母线集中第k个母线电压的灵敏度，P_F.0.l、Q_F.0.l分别为t₀时刻其中第l个可转供负荷支路的有功和无功，x_l取值为0或1，等于0表示不转供该负荷支路，等于1表示转供该负荷支路；L is the number of load branches that can be transferred to the bus load control measures.

Respectively, where k ₁ -th centralized bus l-th injection can be transferred for a load branch is connected in turn supply voltage before the security and stability of the active monitoring device for voltage control bus pre-centralized decision k-th bus voltage sensitivity and without injection The sensitivity of the power to the voltage pre-decision control to the kth bus voltage in the bus set,

Respectively, wherein the l th rotatable safe and stable supply voltage monitoring device for the load branch after the transfer of the connected busbars k ₂ concentration of the injection of active voltage control bus pre-centralized decision k-th bus voltage sensitivity and without injection The sensitivity of the work to the voltage pre-decision control bus bar voltage of the kth bus bar concentration, P _F.0.l , Q _F.0.l are the active and reactive power of the lth transferable load branch at time t ₀ respectively. The value of x _l is 0 or 1, equal to 0 means no transfer to the load branch, and equal to 1 means transfer to the load branch;

A为母线无功补偿设备控制措施集中可切除的并联电抗器支路数，

为其中第a个并联电抗器所连接的电压安全稳定监控设备集中第k₃个母线的注入无功对电压预决策控制母线集中第k个母线电压的灵敏度，Q_G.0.a为t₀时刻其中第a个并联电抗器切除的无功，y_a取值为0或1，等于0表示不切除该并联电抗器支路，等于1表示切除该并联电抗器支路；A is the busbar reactive power compensation device control measures, the number of shunt reactor branches that can be cut off,

Wherein the sensitivity of the voltage monitoring device of a safe and stable parallel connected reactors k ₃ concentration of the bus bars injecting reactive voltage control bus pre-decision on the k-th concentration bus _voltage, Q G.0.a to t ₀ At the moment, the reactive power of the a-th parallel reactor is cut off, y _a takes _a value of 0 or 1, equal to 0 means that the shunt reactor branch is not cut off, and equal to 1 means that the shunt reactor branch is cut off;

B为母线无功补偿设备控制措施集中可投入的并联电容器支路数，

为其中第b个并联电容器所连接的电压安全稳定监控设备集中第k₄个母线的注入无功对电压预决策控制母线集中第k个母线电压的灵敏度，Q_H.0.b为t₀时刻其中第b个并联电容器投入后的无功，采用并联电容器投入的容抗及相连的母线在t₀时刻的电压来计算，z_b取值为0或1，等于0表示不投入该并联电容器支路，等于1表示投入该并联电容器支路；B is the number of shunt capacitor branches that can be invested in the control measures of the bus reactive power compensation equipment.

Voltage stability in which the security monitoring device b th capacitors connected in parallel to k ₄ th concentration of injecting reactive bus voltage control bus pre-decision on the k-th concentration sensitivity bus _voltage, Q H.0.b to time t ₀ The reactive power after the input of the b-th parallel capacitor is calculated by the capacitive reactance of the parallel capacitor input and the voltage of the connected bus bar at time t _{0. The} value of z _b is 0 or 1, and equal to 0 means that the parallel capacitor branch is not input. Road, equal to 1 means to input the shunt capacitor branch;

v_s.k、v_c.k分别为t₀时刻电压预决策控制母线集中第k个母线的电压安全稳定临界值和紧急控制启动门槛值。v _sk and v _ck are respectively the voltage safety stability threshold and the emergency control threshold of the kth bus in the voltage pre-decision control bus set at time t ₀ .

图1中步骤8描述的是，若最新的电压安全稳定预决策紧急控制措施已获得、且t₀-t_c小于等于设定的预决策紧急控制措施的有效时间(通常可设为0.3s)，则对于最新的电压安全稳定预决策紧急控制措施所关联的电压预决策控制母线集与电压待控母线集的交集非空的情况，将最新的电压安全稳定预决策紧急控制措施直接实施，返回步骤1)，对于最新的电压安全稳定预决策紧急控制措施所关联的电压预决策控制母线集与电压待控母线集的交集是空集的情况，返回 步骤1)；否则，返回步骤1)。Step 8 in Figure 1 describes if the latest voltage safety and stability pre-decision emergency control measures have been obtained, and t ₀ -t _{c is} less than or equal to the effective time of the set pre-decision emergency control measures (usually set to 0.3s) For the latest voltage safety and stability pre-decision emergency control measures, the intersection of the voltage pre-decision control bus set and the voltage pending bus set is not empty, and the latest voltage safety and stability pre-decision emergency control measures are directly implemented and returned. Step 1), for the case where the intersection of the voltage pre-decision control bus set and the voltage standby bus set associated with the latest voltage safety and stability pre-decision emergency control measure is an empty set, return to step 1); otherwise, return to step 1).

虽然本发明已以较佳实施例公开如上，但实施例并不是用来限定本发明的。在不脱离本发明之精神和范围内，所做的任何等效变化或润饰，同样属于本发明之保护范围。因此本发明的保护范围应当以本申请的权利要求所界定的内容为标准。 Although the invention has been disclosed above in the preferred embodiments, the embodiments are not intended to limit the invention. Any equivalent changes or modifications made without departing from the spirit and scope of the invention are also within the scope of the invention. Therefore, the scope of protection of the present invention should be defined by the content defined in the claims of the present application.

Claims (3)

1. 基于同步测量信息的电压安全稳定自适应紧急控制方法，其特征在于：A voltage safety stable adaptive emergency control method based on synchronous measurement information, characterized in that:

   1)汇集基于同步测量的电压安全稳定监控设备集中所有母线的电压和支路潮流信息，并按设定的采样存储周期T₀存储这些信息，得到包括最新同步测量时刻t₀信息在内的实测历史信息，进入步骤2)；1) Combine the voltage and branch flow information of all bus bars in the voltage safety and stability monitoring device based on synchronous measurement, and store the information according to the set sampling storage period T _{0 to} obtain the measured information including the latest synchronous measurement time t ₀ information. Historical information, proceed to step 2);

   2)若汇集的t₀时刻的电压安全稳定监控设备集中所有母线的电压都分别大于等于相应母线电压控制的计算启动门槛值或其中至少有1个母线的电压小于等于相应母线电压的故障状态门槛值，则返回步骤1)；若汇集的t₀时刻的电压安全稳定监控设备集中所有母线的电压都分别大于等于相应母线电压的紧急控制启动门槛值且其中至少有1个母线的电压小于相应母线电压控制的计算启动门槛值，则进入步骤3)；若汇集的t₀时刻的电压安全稳定监控设备集中所有母线的电压都分别大于相应母线电压的故障状态门槛值且其中至少有1个母线的电压小于相应母线电压的紧急控制启动门槛值，则将电压小于相应母线电压的紧急控制启动门槛值的母线过滤出来，构成电压待控母线集，进入步骤8)；2) If the voltages at the time t _{0 of the} collection are safe and stable, the voltages of all the bus bars in the centralized control device are respectively greater than or equal to the calculated starting threshold of the corresponding bus voltage control or the fault state threshold in which at least one bus voltage is less than or equal to the corresponding bus voltage. The value returns to step 1); if the collected voltages at time t ₀ are safely and stably monitored, the voltages of all the bus bars are respectively greater than or equal to the emergency control start threshold of the corresponding bus voltage, and at least one of the bus bars has a voltage less than the corresponding bus bar. If the calculation of the voltage control starts the threshold, the process proceeds to step 3); if the voltage at the time t _{0 is} collected, the voltages of all the bus bars in the centralized monitoring device are respectively greater than the fault state threshold of the corresponding bus voltage and at least one of the bus bars is included. If the voltage is less than the emergency control start threshold of the corresponding bus voltage, the bus bar whose voltage is less than the emergency control start threshold of the corresponding bus voltage is filtered out to form a voltage standby bus set, and proceeds to step 8);

   所述母线电压控制的计算启动门槛值大于相应母线电压的紧急控制启动门槛值，母线电压的紧急控制启动门槛值大于相应母线电压的安全稳定临界值，母线电压的安全稳定临界值大于相应母线电压的故障状态门槛值；The calculation threshold value of the bus voltage control is greater than the emergency control start threshold of the corresponding bus voltage, and the emergency control threshold of the bus voltage is greater than the safety stability threshold of the corresponding bus voltage, and the safety stability threshold of the bus voltage is greater than the corresponding bus voltage. Fault state threshold value;

   3)若汇集的实测历史信息所对应的时间长度T与设定的灵敏度计算采样周期T_s之比小于4，则返回步骤1)，否则将t₀时刻作为第1个采样时刻点，以T_s对实测历史信息进行采样，使得第2个采样时刻点为t₀-T_s时刻，第3个采样时刻点为t₀-2T_s时刻，第4个采样时刻点为t₀-3T_s时刻，第5个采样时刻点为t₀-4T_s时刻，进入步骤4)；3) If the ratio of the time length T corresponding to the collected measured history information to the set sensitivity calculation sampling period T _s is less than 4, return to step 1), otherwise the time t ₀ is taken as the first sampling time point, to T _s samples the measured history information so that the second sampling time point is t ₀ -T _s time, the third sampling time point is t ₀ -2T _s time, and the fourth sampling time point is t ₀ -3T _s time , the fifth sampling time point is t ₀ -4T _s time, proceeds to step 4);

   其中，T_s设置为实测历史信息的采样存储周期T₀的整数倍；Where T _{s is} set to an integer multiple of the sampling storage period T ₀ of the measured historical information;

   4)基于相邻的两个采样时刻点的母线电压和支路潮流同步测量信息，建立反映两个采样时刻点之间各个母线的电压变化量、负荷有功变化量、负荷及无功补偿设备总无功变化量与各个母线注入有功对母线电压的灵敏度、注入无功 对母线电压的灵敏度以及电网中其它因素引起母线电压的变化量的关联方程组，将各个母线注入有功对母线电压的灵敏度和注入无功对母线电压的灵敏度，以及在T_s内电网中其它因素引起母线电压的变化量作为变量，并假设在不同的两个相邻采样时刻点的关联方程组中，这些变量是相同的，采用优化方法联立求解4个反映相邻的两个采样时刻点运行状态之间关系的关联方程组；若有最优解且是唯一解，则将最优解作为相应的变量的最新解，并将t₀时刻作为最新解所关联的时刻t_r，进入步骤5)，否则，进入步骤5)；4) Based on the bus voltage and branch current synchronization measurement information of two adjacent sampling time points, establish a voltage variation, load active variation, load and reactive power compensation equipment for each bus bar between two sampling time points. The reactive power variation is related to the sensitivity of each busbar injection active to the bus voltage, the sensitivity of the injected reactive power to the bus voltage, and the related equations caused by other factors in the grid causing the variation of the bus voltage. The sensitivity of each busbar to the active bus voltage is The sensitivity of the injected reactive power to the bus voltage, and the amount of change in the bus voltage caused by other factors in the T _s as a variable, and assume that these variables are the same in the associated equations at two different sampling time points. The optimization method is used to solve the four correlation equations that reflect the relationship between the two adjacent sampling time points. If there is an optimal solution and is the only solution, the optimal solution is taken as the latest solution of the corresponding variable. And step t ₎ as the time t _r associated with the latest solution, proceeds to step 5), otherwise, proceeds to step 5);

   5)若各个母线注入有功对母线电压的灵敏度和注入无功对母线电压的灵敏度，以及在T_s内电网中其它因素引起母线电压的变化量的解已获得、且t₀-t_r小于等于设定的灵敏度有效时间，则将汇集的t₀时刻的所有母线中电压小于相应母线电压的预决策控制门槛值的母线过滤出来，构成电压预决策控制母线集，对于电压预决策控制母线集非空的情况，进入步骤6)，对于电压预决策控制母线集为空的情况，返回步骤1)；5) If the sensitivity of each busbar injection active to the bus voltage and the sensitivity of the injected reactive power to the bus voltage, and the solution of the variation of the bus voltage caused by other factors in the grid in T _s have been obtained, and t ₀ -t _{r is} less than or equal to The set sensitivity time is filtered, and the bus bars of all the bus bars at the time t ₀ are less than the pre-decision control threshold of the corresponding bus voltage are filtered out to form a voltage pre-decision control bus set, and the voltage pre-decision control bus set is not Empty, go to step 6), for the voltage pre-decision control bus set is empty, return to step 1);

   否则，返回步骤1)；Otherwise, return to step 1);

   所述母线电压的预决策控制门槛值大于相应母线电压的紧急控制启动门槛值；The pre-decision control threshold value of the bus voltage is greater than an emergency control start threshold of the corresponding bus voltage;

   6)将母线注入有功对母线电压的灵敏度大于设置的母线注入有功对母线电压的灵敏度门槛值且可控的母线负荷过滤出来，构成母线负荷控制措施集，将母线注入无功对母线电压的灵敏度大于设置的母线注入无功对母线电压的灵敏度门槛值且可控的母线负荷过滤出来，加入到母线负荷控制措施集，将母线注入无功对母线电压的灵敏度大于设置的母线注入无功对母线电压的灵敏度门槛值且可切除的母线并联电抗器和可投入的母线并联电容器过滤出来，构成母线无功补偿设备控制措施集，若母线负荷控制措施集非空或母线无功补偿设备控制措施集非空，进入步骤7)，否则，返回步骤1)；6) The sensitivity of the busbar injection active to the bus voltage is greater than the sensitivity threshold of the busbar injection active to the busbar voltage and the controllable busbar load is filtered out to form the busbar load control measure set, and the sensitivity of the busbar to the reactive busbar voltage is injected. Greater than the set busbar injection reactive power threshold voltage threshold and the control of the bus load is filtered out, added to the bus load control measures set, the busbar injection reactive power is more sensitive to the bus voltage than the set bus injection reactive bus to the bus The sensitivity threshold of the voltage and the resectable bus shunt reactor and the input bus shunt capacitor are filtered out to form the control set of the bus reactive power compensation device. If the bus load control measures are set, the non-empty or bus reactive power compensation device control measures are set. Non-empty, proceed to step 7), otherwise, return to step 1);

   所述可控的母线负荷是指连接到该母线的可控的负荷支路； The controllable bus load refers to a controllable load branch connected to the bus bar;

   7)建立以切负荷的控制代价最小为目标函数，考虑不同切负荷措施的控制优先级、负荷转供和切负荷措施中有功与无功是一体的、以及负荷转供、切负荷和投退无功补偿设备后满足电压预决策控制母线集中各个母线电压的增量大于等于相应母线电压的紧急控制启动门槛值与其电压安全稳定临界值之差的约束条件的01整数规划模型，通过求解01整数规划模型来计算电压安全稳定预决策紧急控制措施；7) Establish the minimum control cost of load shedding as the objective function, consider the control priority of different load shedding measures, the active and reactive power in the load transfer and load shedding measures, and the load transfer, load shedding and retreat After the reactive power compensation device meets the voltage pre-decision control, the increment of each bus voltage in the bus bar concentration is greater than or equal to the corresponding bus voltage, and the difference between the emergency control start threshold and the voltage safety stability threshold is 01 integer programming model, by solving the 01 integer Planning models to calculate voltage safety and stability pre-decision emergency control measures;

   若能够得到最优解，则将与其中任一最优解相应的负荷转供措施、切负荷措施与投退无功补偿设备措施作为最新的电压安全稳定预决策紧急控制措施，并将电压预决策控制母线集和t₀时刻作为最新的电压安全稳定预决策紧急控制措施所关联的电压预决策控制母线集和时刻t_c，再返回步骤1)，否则返回步骤1)；If the optimal solution can be obtained, the load transfer measures, load shedding measures and retreat reactive power compensation equipment measures corresponding to any of the optimal solutions are taken as the latest voltage safety and stability pre-decision emergency control measures, and the voltage is pre-empted. Decision control bus set and time t ₀ as the latest voltage safety and stability pre-decision emergency control measures associated with the voltage pre-decision control bus set and time t _c , then return to step 1), otherwise return to step 1);

   8)若最新的电压安全稳定预决策紧急控制措施已获得、且t₀-t_c小于等于设定的预决策紧急控制措施的有效时间，则对于最新的电压安全稳定预决策紧急控制措施所关联的电压预决策控制母线集与电压待控母线集的交集非空的情况，将最新的电压安全稳定预决策紧急控制措施直接实施，返回步骤1)，对于最新的电压安全稳定预决策紧急控制措施所关联的电压预决策控制母线集与电压待控母线集的交集是空集的情况，返回步骤1)；8) If the latest voltage safety and stability pre-decision emergency control measures have been obtained, and t ₀ -t _{c is} less than or equal to the effective time of the set pre-decision emergency control measures, it is associated with the latest voltage safety and stability pre-decision emergency control measures. The voltage pre-decision control bus set and the voltage standby bus set intersection are not empty, the latest voltage safety and stability pre-decision emergency control measures are directly implemented, return to step 1), for the latest voltage safety and stability pre-decision emergency control measures If the intersection of the associated voltage pre-decision control bus set and the voltage pending bus set is an empty set, return to step 1);

   否则，返回步骤1)。Otherwise, return to step 1).
2. 根据权利要求1所述的基于同步测量信息的电压安全稳定自适应紧急控制方法，其特征在于，在步骤4)中分别通过方程组(1)-(4)来表示从第1个采样时刻点开始，相邻的2个采样时刻点之间各个母线的电压变化量、负荷有功变化量、负荷及无功补偿设备总无功变化量与各个母线注入有功对母线电压的灵敏度、注入无功对母线电压的灵敏度以及电网中其它因素引起母线电压的变化量的关系，有功、无功都以流入母线为正： The voltage safety stable adaptive emergency control method based on synchronous measurement information according to claim 1, wherein in step 4), the first sampling time point is represented by the equations (1)-(4) respectively. At the beginning, the voltage variation of each busbar between the two adjacent sampling time points, the load active power variation, the total reactive power variation of the load and the reactive power compensation device, and the sensitivity of each busbar injection active to the bus voltage, and the reactive power injection The sensitivity of the bus voltage and the relationship between the bus voltage and other factors in the grid cause positive and reactive power to be positive in the incoming bus:

   

   

   

   

   

   

   

   

   其中，n为电压的同步测量信息中母线的个数，m为负荷的同步测量信息中母线的个数，M为无功的同步测量信息中母线的个数，在求解方程组(1)-(4)之前，需要将同步测量信息中所有负荷的母线排在前面，没有负荷、只有无功补偿设备的母线排在后面，v_0.i、v_1.i、v_2.i、v_3.i和v_4.i分别为第1至第5个采样时刻点电压安全稳定监控设备集中第i个母线的电压，λ_P.i.j、λ_Q.i.j分别为电压安全稳定监控设备集中第j个母线的注入有功对第i个母线电压的灵敏度和注入无功对第i个母线电压的灵敏度，P_0.j、P_1.j、P_2.j、P_3.j和P_4.j分别为第1至第5个采样时刻点电压安全稳定监控设备集中第j个母线同步测量信息中负荷的总有功，Q_0.j、Q_1.j、Q_2.j、Q_3.j和Q_4.j分别为第1至第5个采样时刻点电压安全稳定监控设备集中第j个母线同步测量信息中负荷与无功补偿设备的总无功，△V_i为电网中其它因素引起电压安全稳定监控设备集中第i个母线电压的变化量； Where n is the number of busbars in the synchronous measurement information of the voltage, m is the number of busbars in the synchronous measurement information of the load, and M is the number of busbars in the synchronous measurement information of reactive power, in solving the equations (1)- before (4), the measurement information need to synchronize all of the top surface of the bus load, no load, only the reactive power compensation device at the back of the _{bus, v 0.i, v 1.i, v} 2.i, v 3 _.i and v _4.i are the voltages of the i-th busbar in the voltage safety and stability monitoring equipment in the first to fifth sampling time points respectively, and λ _Pij and λ _Qij are the injections of the jth busbar in the voltage safety and stability monitoring equipment. The sensitivity of the active to the i-th bus voltage and the sensitivity of the injected reactive power to the i-th bus voltage, P _0.j , P _1.j , P _2.j , P _3.j and P _4.j are respectively the first The total active power of the load in the jth bus synchronous measurement information in the voltage safety and stability monitoring equipment to the 5th sampling time point, Q _0.j , Q _1.j , Q _2.j , Q _3.j and Q _4.j The total reactive power of the load and reactive power compensation equipment in the j-th bus synchronous measurement information of the voltage safety and stability monitoring equipment in the 1st to 5th sampling time points respectively △ V _i causes a voltage monitoring device for the security and stability of the power grid and other factors change amount of the i-th focus bus voltage;

   通过优化方法求解公式(5)来计算λ_P.i.j、λ_Q.i.j和△V_i：Calculate λ _Pij , λ _Qij and ΔV _i by solving the formula (5) by the optimization method:

   

   
3. 根据权利要求1所述的基于同步测量信息的电压安全稳定自适应紧急控制方法，其特征在于，在步骤7)中通过求解以公式(6)表示目标函数、以公式(7)表示约束条件的01整数规划模型，来计算电压安全稳定预决策紧急控制措施，有功、无功都以流入母线为正：The voltage safety stable adaptive emergency control method based on synchronous measurement information according to claim 1, wherein in step 7), the objective function is represented by the formula (6) and the constraint condition is represented by the formula (7). 01 integer programming model to calculate voltage safety and stability pre-decision emergency control measures, both active and reactive are positive inflow bus:

   

   

   

   

   其中，R为母线负荷控制措施集中切除负荷支路的优先级数，D_r为母线负 荷控制措施集中优先级为r的可切负荷支路数，r越大，优先级越高，越优先切除，x_r.d取值为0或1，等于0表示不切除该负荷，等于1表示切除该负荷，当x_r+1.d等于0时，x_r.d只能等于0，当x_r+1.d等于1时，x_r.d可以等于0，也可以等于1，P_E.r.0.d、Q_E.r.0.d分别为t₀时刻优先级为r的可切负荷支路中第d个负荷支路的有功和无功，C_r.0.d为t₀时刻切除优先级为r的负荷支路中第d个负荷支路的控制代价，K为电压预决策控制母线集中母线数，

   

   分别为优先级为r的可切负荷支路中第d个负荷支路所连接的电压安全稳定监控设备集中第k₀个母线的注入有功对电压预决策控制母线集中第k个母线电压的灵敏度和注入无功对电压预决策控制母线集中第k个母线电压的灵敏度；Where R is the priority number of the bus load control measures to cut off the load branch collectively, and D _r is the number of loadable branches with the priority of the bus load control measures being r. The larger the r, the higher the priority and the higher the priority , x _rd takes a value of 0 or 1, equal to 0 means not to remove the load, equal to 1 means to cut off the load, when x _r+1.d is equal to 0, x _rd can only be equal to 0, when x _r+1.d When it is equal to 1, x _rd can be equal to 0 or equal to 1, and P _Er0.d and Q _Er0.d are the active and non-active of the d-th load branch in the load- _cutable branch with priority r at time t ₀ respectively. Work, C _r.0.d is the control cost of the d-th load branch in the load branch with the priority r being cut off at time t ₀ , and K is the number of bus bars in the voltage pre-decision control bus bar.

   

   Priority are safe and stable voltage centralized monitoring device of busbars k ₀ r may be injected as a load shedding d th branch connected branches active load voltage control bus pre-centralized decision k-th bus voltage sensitivity And the sensitivity of the injected reactive power to the voltage of the kth bus voltage in the voltage pre-determination control bus set;

   L为母线负荷控制措施集中可转供负荷支路数，

   

   分别为其中第l个可转供负荷支路在转供前所连接的电压安全稳定监控设备集中第k₁个母线的注入有功对电压预决策控制母线集中第k个母线电压的灵敏度和注入无功对电压预决策控制母线集中第k个母线电压的灵敏度，

   

   分别为其中第l个可转供负荷支路在转供后所连接的电压安全稳定监控设备集中第k₂个母线的注入有功对电压预决策控制母线集中第k个母线电压的灵敏度和注入无功对电压预决策控制母线集中第k个母线电压的灵敏度，P_F.0.l、Q_F.0.l分别为t₀时刻其中第l个可转供负荷支路的有功和无功，x_l取值为0或1，等于0表示不转供该负荷支路，等于1表示转供该负荷支路；L is the number of load branches that can be transferred to the bus load control measures.

   

   Respectively, where k ₁ -th centralized bus l-th injection can be transferred for a load branch is connected in turn supply voltage before the security and stability of the active monitoring device for voltage control bus pre-centralized decision k-th bus voltage sensitivity and without injection The sensitivity of the power to the voltage pre-decision control to the kth bus voltage in the bus set,

   

   Respectively, wherein the l th rotatable safe and stable supply voltage monitoring device for the load branch after the transfer of the connected busbars k ₂ concentration of the injection of active voltage control bus pre-centralized decision k-th bus voltage sensitivity and without injection The sensitivity of the work to the voltage pre-decision control bus bar voltage of the kth bus bar concentration, P _F.0.l , Q _F.0.l are the active and reactive power of the lth transferable load branch at time t ₀ respectively. The value of x _l is 0 or 1, equal to 0 means no transfer to the load branch, and equal to 1 means transfer to the load branch;

   A为母线无功补偿设备控制措施集中可切除的并联电抗器支路数，

   

   为其中第a个并联电抗器所连接的电压安全稳定监控设备集中第k₃个母线的注入无功对电压预决策控制母线集中第k个母线电压的灵敏度，Q_G.0.a为t₀时刻其中第a个并联电抗器切除的无功，y_a取值为0或1，等于0表示不切除该并联电抗器支路，等于1表示切除该并联电抗器支路；A is the busbar reactive power compensation device control measures, the number of shunt reactor branches that can be cut off,

   

   Wherein the sensitivity of the voltage monitoring device of a safe and stable parallel connected reactors k ₃ concentration of the bus bars injecting reactive voltage control bus pre-decision on the k-th concentration bus _voltage, Q G.0.a to t ₀ At the moment, the reactive power of the a-th parallel reactor is cut off, y _a takes _a value of 0 or 1, equal to 0 means that the shunt reactor branch is not cut off, and equal to 1 means that the shunt reactor branch is cut off;

   B为母线无功补偿设备控制措施集中可投入的并联电容器支路数，

   

   为 其中第b个并联电容器所连接的电压安全稳定监控设备集中第k₄个母线的注入无功对电压预决策控制母线集中第k个母线电压的灵敏度，Q_H.0.b为t₀时刻其中第b个并联电容器投入后的无功，采用并联电容器投入的容抗及相连的母线在t₀时刻的电压来计算，z_b取值为0或1，等于0表示不投入该并联电容器支路，等于1表示投入该并联电容器支路；B is the number of shunt capacitor branches that can be invested in the control measures of the bus reactive power compensation equipment.

   

   Voltage stability in which the security monitoring device b th capacitors connected in parallel to k ₄ th concentration of injecting reactive bus voltage control bus pre-decision on the k-th concentration sensitivity bus _voltage, Q H.0.b to time t ₀ The reactive power after the input of the b-th parallel capacitor is calculated by the capacitive reactance of the parallel capacitor input and the voltage of the connected bus bar at time t _{0. The} value of z _b is 0 or 1, and equal to 0 means that the parallel capacitor branch is not input. Road, equal to 1 means to input the shunt capacitor branch;

   v_s.k、v_c.k分别为t₀时刻电压预决策控制母线集中第k个母线的电压安全稳定临界值和紧急控制启动门槛值。 v _sk and v _ck are respectively the voltage safety stability threshold and the emergency control threshold of the kth bus in the voltage pre-decision control bus set at time t ₀ .

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