基于虚拟同步发电机的光-储调频控制策略研究

摘要

太阳能光伏发电作为一种可再生能源发电在电网中渗透率不断升高,与此同时,对于系统稳定性的影响也越来越不得忽视.首先,对光伏发电系统输出特性进行分析.针对光伏并网发电在遇到频率波动时不具备惯性和调频能力的问题,提出了应用储能补偿系统的调频需求,通过对储能逆变器采用虚拟同步发电机控制策略,使光-储作为一整体对外具备类似同步发电机特性,同时该系统还拥有保证光伏对外输出功率稳定的能力.最后,利用PSCAD/EMTDC仿真验证了所提出调频控制策略的有效性.%As a kind of renewable-energy-based power generation,photovoltaic power generation has been increasingly used for power system.And meanwhile,more attention is paying to the effect of system stability.The paper began with analysis of the output characteristics of photovoltaic system.In view of the absence of inertia of grid-connected photovoltaic power generation in the event of frequency fluctuation,the ideas to make up for the system virtual inertia with the stored energy were presented in the paper.By using the controlling strategies for virtual synchronous generator to the energy storage inverter,the integrated photovoltaic-storage system would work as a whole the same way with the synchronous generator.And meanwhile,it would maintain the stable output PV power of the integrated photovoltaic-storage system.At last,PSCAD/EMTDC simulation was used to verify the effectiveness of making up for the virtual inertia through the controlling strategies presented in the paper.