基于多时间尺度变流器主动控制的储能电站故障穿越方法OA

The inherent control delay of the energy storage converter,together with the relevant technical code requirements for positive-and negative-sequence reactive power injection,may cause both transient and steady-state overcurrent risks,respectively.It is prone to result in failure of fault ride-through.To address this issue,this paper proposes a fault ride-through method for energy storage power stations based on multi-timescale hierarchical control.In this method,the fault process is divided into the instantaneous scale and the short-term scale.On the instantaneous scale,a current-hysteresis-based insulated-gate bipolar transistor(IGBT)blocking method is adopted to suppress the inrush current before the controller responds.On the short-term scale,a multi-objective control framework incorporating negative-sequence reactive power regulation is developed to achieve software-based current limiting and code compliance.Through multi-timescale coordinated control,the current is suppressed throughout the entire fault process,while simultaneously mitigating active power oscillations and maximizing the utilization of converter capacity.Finally,a real-time digital simulation platform is used to build a simulation model of an energy storage power station in Guangdong,China,and the simulation results validate the effectiveness of the proposed strategy.