大功率扰动下计及系统频率分布特性的紧急控制策略研究

Analysis of the emergency control strategy of system frequency considering system frequency distribution characteristics under large power disturbance

电网发生大功率扰动时,系统频率在大幅度偏移情况下,还可能存在明显的时空分布现象。通过对单机系统频率响应特性和两机系统的频率差异的分析,提出了大频差下考虑非线性因素的系统频率解析模型,以此来估算故障扰动下系统频率的最大偏移量。提出通过在不同时间选择在不同地点采取紧急控制的协调配合方法,在减小频率最大偏移量的同时,改善频率时空分布现象,从而提高电网的频率安全稳定性。

When large-power disturbances occur in power grids,the system frequency will shift greatly,and there may be obvious spatial-temporal distribution characteristics.By analyzing the single-machine frequency response characteristics of the system and the frequency difference between the two systems,a system frequency analysis model considering nonlinear factors under large frequency difference is proposed to estimate the maximum offset of the system frequency.It is proposed to reduce the maximum frequency offset and improve the frequency spatiotemporal distribution characteristics by selecting the coordination method of emergency control at different locations at different times,thus enhancing the safety and stability of the power grid.