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目前大部分同期并列装置主要是通过调整发电机的转速和励磁来调整频率差和电压差,只适用于发电厂与系统的并列,不适用于电网间的并列。文中提出了一种基于功率传递的电网间同期并列的方法,并将该方法与现有静止同步补偿器(STATCOM)技术相结合,形成具有电网间同期并列和无功补偿功能的复合系统。作为电网间同期并列装置,该系统具有速度快、操作简单等优点,可用于电网间自动快速同期并列和环网并列操作。在电网正常的情况下,可作为无功补偿装置使用,不会造成资源闲置。仿真实验验证了该方法的有效性。
At present, most parallel units at the same time mainly adjust the frequency difference and voltage difference by adjusting the speed and excitation of the generator, which is only applicable to the parallel of power plants and systems and not suitable for the parallel connection of power grids. In this paper, a parallel method of power grid synchronization based on power transfer is proposed. Combined with STATCOM technology, this method is combined to form a hybrid system with simultaneous grid synchronization and reactive power compensation. As the same parallel device between power grids, the system has the advantages of fast speed and simple operation, and can be used for the parallel synchronization between the power grid and the parallel operation of the ring network. In the case of normal power grid, it can be used as a reactive power compensation device, will not cause idle resources. Simulation results show the effectiveness of this method.