基于电压稳定在线监测指标的预防控制方法

Preventive Control Method of Electric Power System Based on On-line Voltage Stability Monitoring Index

为实现在线预决策和实时匹配的电力系统预防控制策略,稳定水平分析的实时性与控制措施集的选取速度尤为关键。该文以非线性等值分析方法定义的阻抗模裕度指标为系统电压稳定裕度评估指标,建立了阻抗模裕度指标与各类控制参数的灵敏度关系。在此基础上,通过预选故障和参与控制集等策略,提出一种新的基于序列线性规划的预防控制方法。该方法避免了求解基于连续潮流法的潮流极限点和潮流雅克比矩阵零特征值的左特征向量,加快了电压稳定安全裕度和控制灵敏度的分析速度,提高了方法自适应系统运行状态变化的能力。为了克服阻抗模裕度指标在稳定域上的线性性差问题,采用了快速预测方法求出负荷裕度值,作为控制决策模型中的辅助安全约束条件,保证了预防控制效果的可靠性。最后,该文提出方法在中国南部某省级2 273节点实际电网中进行了测试,验证其可行性和有效性。

To achieve a preventive control strategy, which realizes online decision and real-time matching, the speed of real-time stability assessment and selection of control measures is the key. The impedance module margin was applied to assess the level of voltage stability in this paper. Furthermore, the sensitivity of the index with respect to control variables was presented, which can avoid computing the left eigenvector of the zero eigenvalue of Jacobian matrix of power system. Based on aforementioned theory, this paper proposed a successive linear programming model for voltage preventive control. This method speeds up the updated time of preventive control greatly. In order to overcome the index can not exactly reflect the stability domain when the power system suffer a disturbance or operates near the critical point, the nonlinear equivalent principle was applied to implement rapid prediction of the maximum load ability point, the load margin was obtained to take as a complementary object for the control model. The proposed method is tested on a real power system in the south of China to verify its feasibility and effectiveness.