银东直流逆变站换相失败后对送端系统的影响及仿真分析

Influence of Commutation Failure on Transmitter System in Yindong DC Inverter Station and Its Simulation Analysis

高压直流输电系统受端换相失败时,整流侧换流器短时间内会从送端交流系统吸收大量无功功率,在送端交流系统较弱或其他不利条件下可能产生电压不稳定或保护误动作等问题。以银东直流工程为例,分析了受端换相失败后直流系统的响应特性,研究了直流逆变站换相失败导致的送、受端交流系统故障耦合机理,并通过仿真给出了弱送端系统条件下的电压波动情况,结论对直流工程建设调试和交流电网调度运行具有重要的指导意义。

During receiver commutation failure of HVDC transmission system,more reactive power were absorbed in a short time by rectifier converters from transmitter system,and the voltage stability or protection misoperation might appear in weak transmitter system or other disadvantage conditions. Taking Yindong HVDC transmission project as example,this paper analyzed the response characteristics of DC system after receiver commutation failure,studied the fault coupling mechanism of transmitter system and receiver system caused by the commutation failure of inverter station,and presented the reasons and phenomenon of voltage fluctuation in condition of weak transmitter system through simulation. The conclusions have important guiding significance to the commissioning of DC transmission project and the dispatching operation of AC grid.