计及火电机组OPC保护模型的电力系统机电动态仿真分析

Power system electromechanical dynamic simulation considering thermal power OPC protection model

首先论证了电力系统机电暂态仿真程序中考虑火电机组OPC保护模型的必要性。通过对东北典型火电机组超速保护OPC动作特性的实际调研,在电力系统分析综合程序(PSASP)中搭建了OPC保护相应的数学模型,并通过东北电网典型事故实际仿真对比验证了模型的正确性。最后,结合东北电网实际的频率稳定问题案例对火电机组OPC机网协调管理提出了相应的建议和整改措施。针对具有较大孤网风险的局部地区电网,建议采取调整火电机组OPC保护动作定值、优化OPC保护在系统频率上升和下降阶段的控制策略等措施,以提高其孤网运行成功的概率。

Firstly, it is demonstrated that thermal power OPC protection model needs to be considered in power system electromechanical transient simulation program. Then, the OPC protection mathematical model is built based on Power System Analysis Software Package（PSASP）. Furthermore, the model is verified through dynamic simulation comparison of typical accidents in Northeast China Grid. Finally, combined with actual frequency stability cases of Northeast Power Grid, some relevant management suggestions and measures are put forward on OPC coordinated management between unit and grid. It can improve the success probability of islanding operation in local area power grid with large islanding operation risk, through adjusting the thermal power unit OPC protection action value, optimization of OPC protection strategy in system frequency rising and falling stage.