基于多状态量特征的电网安全稳定紧急控制策略制定方法

Strategy Formulation Method for Security and Stability Emergency Control of Power Grid Based on Multi-state Quantity Characteristics

高比例新能源大电网的运行方式呈现强不确定性和强非线性,利用单一状态量作为方式字(如断面功率)制定的紧急控制策略失配风险愈发增加。基于扩展等面积准则量化分析理论,分析了节点功率注入空间变化引起主导模式稳定性变化及紧急控制策略失配的机理,提出了一种从海量节点功率注入空间中获取影响策略失配的主导特征挖掘方法。基于主导特征的暂态稳定参与因子,通过主导特征量的分群聚合,提出基于多状态量特征的紧急控制策略扩展方式字确定方法。通过扩展紧急控制策略方式字,降低离线紧急控制策略失配风险,提高紧急控制策略的适应性。最后,以实际电网的算例验证了所提方法的有效性。

The operation mode of large-scale power grid with high proportion of renewable energy presents strong uncertainty and nonlinearity,and the risk of mismatching of emergency control strategy formulated by using single state quantity as mode word(such as sectional power)is increasing.Based on the extended equal area criterion quantitative analysis theory,the mechanism of dominant mode stability change and emergency control strategy mismatch caused by node power injection space change is analyzed,and a mining method for dominant characteristics influencing strategy mismatch obtained from the massive node power injection space is proposed.Based on the transient stability participation factors of the dominant characteristic,the extended mode word determination method of the emergency control strategy based on the multi-state quantity characteristics is proposed through the cluster aggregation of the dominant characteristics.By expanding the mode words of the emergency control strategy,the risk of offline emergency control strategy mismatch is reduced and the adaptability of the emergency control strategy is improved.Finally,the effectiveness of the proposed method is verified by a practical grid example.