Controller Design and Application Based VSC for Frequency Synchronous Operation of Asynchronous Grid of China Southern Power Grid
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.
asynchronous power gridfrequency synchronous operationcontrol strategyLuxi VSC-HVDC
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