在线多预想故障静态电压崩溃预防控制

Online Multi-contingency Preventive Control to Avoid Static Voltage Collapse

提出在线多预想故障静态电压崩溃预防控制问题的数学模型及相应的数值计算方法。该模型以最小控制代价为目标,综合考虑了预防控制后正常运行点的可行性及多预想故障条件下的静态电压稳定裕度要求。对于多预想故障静态电压崩溃预防控制问题的求解,借鉴规划领域积极约束集策略的思想,在裕度扫描的基础上确定关键预想故障集,根据关键预想故障集计算预防控制策略,而后对预防控制后的电网进行裕度扫描,确定新的关键预想故障集,循环执行直至所有预想故障条件下的静态电压稳定裕度都得到满足。通过福建电网的数字仿真验证了模型的正确性及算法的有效性。

The mathematical model and relevant numerical algorithm for online multi-contingency preventive control to avoid static voltage collapse are proposed. This model aims to minimize the control cost while maintaining the feasibility of normal operating condition and keeping proper static voltage stability margin for each contingency considered. The proposed algorithm for this model comprises three steps. First, according to the concept of active constraint set in mathematical planning field, the key contingencies are found basing on the static voltage stability margin deficiency by contingency screening. Second, the preventive control strategy is calculated for the key contingencies only. At the last step, the preventive controls are applied to power grid to obtain new operating state. The procedure restarts from the first step until static voltage stability margin for each contingency is satisfied. The validity of proposed model and the efficiency of relevant algorithm are tested by numerical simulations on Fujian power grid in China.