储能/发电机级联式供电系统功率传输控制策略

Power transmission control strategy of energy storage/generator cascaded power supply system

随着可再生能源渗透率的不断提升,区域电网惯性逐步降低,暂态支撑能力严重不足,给电网带来了一系列安全问题。文中提出一种储能与开绕组永磁同步发电机(open-winding permanent magnet synchronous generator,OW-PMSG)级联供电的新型分布式并网发电拓扑,在保证可再生能源消纳的前提下,重新利用原有柴油机,为电网提供功率后备以及惯量支撑。通过对OW-PMSG进行建模以及系统功率流矢量分析,设计基于源网相位差闭环控制的功率传输策略,实现发电机的稳定同步运行。基于该策略,拓扑中的储能变流器可具备同步发电机特性,实现了电网惯性和暂态支撑能力的进一步提升。仿真结果验证了所提控制策略的有效性。

With the increasing penetration rate of renewable energy,the inertia of the power grid gradually decreases,and the transient support capacity is seriously insufficient.It brings a series of security problems to the power grid.A distributed grid-connected topology cascaded by energy storage and open-winding permanent magnet synchronous generator(OW-PMSG)is proposed in this paper.By the topology,the renewable energy can be consumed.At the same time,the diesel engines can provide power backup and inertia support.By modelling the OW-PMSG and analyzing the power flow vector,a power transfer strategy based on the source-grid phase closed-loop control is designed to achieve stable synchronous operation of the generator.Based on this strategy,the energy storage converter can have synchronous generator characteristics,which achieves further improvement of grid inertia and transient support capability.The simulation results verify the feasibility of the proposed control strategy.