基于柔直控制的南方电网异步联网频率同步运行控制器设计与应用

Controller Design and Application Based VSC for Frequency Synchronous Operation of Asynchronous Grid of China Southern Power Grid

电网分区异步运行将成为未来南方电网发展趋势,针对分区异步电网间频率失去了同步性和一致性问题,开展分区异步电网频率同步运行控制策略研究,提出了分区异步电网频率同步运行控制器结构,优化确定运行关键控制参数并通过仿真验证其有效性。鲁西柔直工程作为试点实施分区异步电网频率同步运行,现场实施效果表明该控制能够有效保证分区异步运行电网间实际运行中频率的一致性和同步性,且与电网AGC策略具有良好的适配性,实施中未出现两侧电网功率振荡和频率振荡发散情况,有效改善分区电网频率稳定性和提升分区电网间功率的灵活性支援性能,同时也实现全网调频资源的实时、自动共享,推动构建全网统一的调频辅助服务市场。

The asynchronous operation of power grid partitions is becoming the development trend of China Southern Power Grid in the future.Aiming at the problem that the frequency of the partitioned asynchronous grids lose synchronization and consistency,the research on the control strategy of asynchronous grid frequency synchronous operation is carried out,and the structure of the asynchronous grid frequency synchronous operation controller is proposed.The key control parameters of the operation are optimized and determined and the effectiveness is verified through simulation.The Luxi back-to-back(voltage soulce converter-high voltage direct crreut,VSC-HVDC)is used as a pilot to implement the frequency synchronous operation of the partitioned asynchronous grid.On site implementation results indicate that the frequency synchronous operation control of the asynchronous grid can effectively ensure the frequency consistency and synchronization between the partitioned asynchronous operation grids in actual operation,and is consistent with the AGC strategy of the grid.There is no power oscillation and frequency oscillation divergence on both sides of the power grid.The frequency stability of partitioned power grids is improved and the flexibility and support performance of power between partitioned power grids are enhanced effectively.At the same time,it also realizes real-time and automatic sharing of frequency modulation resources across the entire network,and promotes the construction of a unified frequency modulation auxiliary service market across the entire network.