异步联网后云南电网直流闭锁故障稳定特性及控制措施

摘要

与主网异步联网后，云南电网独立运行，其系统容量小、抗扰动能力差的特性凸显，直流极闭锁后存在功角稳定及频率稳定问题。对此，研究了异步联网后云南境内直流闭锁故障控制措施。因云南电网与主网异步联网后系统特性发生重大变化，原有直流闭锁故障控制措施不再适用。仿真分析在直流过负荷能力范围内利用直流调制及相应控制措施解决直流闭锁故障后的稳定问题，并对高频切机及直流过负荷能力适应性进行校核。%After asynchronously interconnecting with the main network,Yunnan power grid realizes independent operation, but there are some prominent problems such as small system capacity,bad anti-disturbance performance and problems of power angle stability and frequency stability after DC pole blocking. Therefore,this paper studies control measures for DC interlocking fault in Yunnan province after asynchronous interconnection. Due to great change of system characteristic of Yunnan power grid after its asynchronous interconnection with the main network,intrinsic control measures for DC inter-locking fault are not applicable. Thus,the paper carries out simulation and analysis on using DC modulation and control measures to solve stability problems after DC interlocking fault within the range of DC overloading capability and checks a-daptabilities of over frequency generator tripping and DC overloading capability.