光储微电网功率优化方法及协调控制策略研究

Study on Power Optimization Method and Coordinated Control Strategy of Optical Storage Microgrid

光储微电网作为一种友好发电模式具有平抑网侧功率波动、光伏发电产能趋稳以及可调度性等优点,是实现“源-网-荷-储”系统稳定运行和可再生能源充分消纳的优选方案。围绕光储微电网功率优化与灵活运行提出了组件级配置方案和协调控制策略,进一步释放光伏发电潜力以及促进储能单元高效运行。首先,针对光伏组件失配导致的“木桶效应”及储能变换器效率低的问题,分别配置组件级光伏功率优化器和储能部分功率变换器,实现太阳能和电能最大化利用。其次,讨论光伏阵列和储能单元在并/离网工况下多种模式切换,考虑微电网各单元间功率动态平衡,提出一种光储微电网协调控制策略,实现各单元在不同控制模式之间平滑切换及功率自主分配。最后,利用Matlab/Simulink搭建30kW光储微电网仿真平台,验证所提协调控制策略的可行性与有效性。

As a friendly power generation mode, optical storage microgrid has the advantages of stabilizing grid side power fluctuation, stabilizing photovoltaic(PV) power generation capacity and schedulability. It is the preferred scheme to realize the stable operation of ‘source-network-load-storage’ system and the full absorption of new energy. Based on the power optimization and flexible operation of optical storage microgrid, a component level configuration scheme and coordinated control strategy are proposed to further release the potential of PV power generation and promote the efficient operation of energy storage unit. Firstly, aiming at the barrel effect caused by PV module mismatch and low efficiency of energy storage converter, PV module power optimizer and energy storage partial power converter are configured respectively to maximize the utilization of solar energy and electric energy.Secondly, the multi-mode switching of PV array and energy storage unit under on/off grid conditions is discussed. Considering the power dynamic balance among the units of microgrid, a coordinated control strategy of optical storage microgrid is proposed to realize the smooth switching and power automatic distribution of each unit between different control modes. Finally, a 30 kW optical storage microgrid simulation platform is built by using Matlab/Simulink to verify the feasibility and effectiveness of the proposed coordinated control strategy.