交直流系统的静态电压稳定预防控制

摘要

A preventive control strategy is proposed to avoid the static voltage collapse of AC/DC power system. The critical contingencies dissatisfying the desired static voltage stability margin are determined and a preventive control optimal model is established,which takes the minimum control cost as its objective and includes the operating feasibility constraints in normal operating conditions and the static voltage stability margin constraints in all critical contingencies conditions. With the quadratic characteristics, the model considers synthetically the impact of DC control mode on the preventive control. Simulation analysis for the modified IEEE 14-bus AC/DC power system demonstrates the correctness and effectiveness of the proposed preventive control strategy.%提出防止交直流系统出现静态电压失稳现象的预防控制策略.确定交直流系统中不满足静态电压稳定裕度要求的关键预想故障并建立预防控制优化模型.该模型以控制代价最小为目标,其约束条件包括交直流系统正常运行状态下的可行性约束及关键预想故障状态下的静态电压稳定裕度约束.模型能综合考虑直流控制方式对交直流系统静态电压稳定预防控制的影响,且具有全二次特点.针对修正IEEE 14节点交直流系统的仿真分析,验证了所提预防控制策略的正确性和有效性.