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进行系统低频减载方案设计时 ,简单的频率响应模型由于未考虑系统电压对频率过程的影响而导致不少情况下无法适用。文中针对孤立小受端系统 ,通过仿真表明在大有功缺额扰动下此类系统极易出现低电压问题 ,从而很大程度上影响了频率行为 ,并影响了低频减载装置的动作。通过比较不同的并联电容投切模式对频率过程的影响 ,提出了合理抑制电压升高基础上的更为合理的减载方案 ,以更有效地恢复系统频率和电压。同时提出了实现过程中需要解决的问题
When designing the system low-frequency load shedding scheme, the simple frequency response model can not be applied in many cases because it does not consider the influence of the system voltage on the frequency process. In this paper, a small isolated end system is isolated. Simulation shows that such systems are prone to low voltage problems under large active faults, which affects the frequency behavior to a great extent and affects the operation of the low-frequency load shedding device. By comparing the influence of different shunt capacitor switching modes on the frequency process, a more reasonable load shedding scheme based on reasonable suppression of voltage rise is proposed to recover the system frequency and voltage more effectively. At the same time, the problems that need to be solved in the process of realization are put forward