基于准PR控制的锂电池储能并网系统功率控制

传统PQ控制下的锂电池储能系统需引入直流解耦分量,导致并网电能质量动态功率补偿性能受到影响,且控制结构较复杂.文章提出准比例谐振(PR)控制的锂电池储能并网系统的直接功率控制策略.该策略无需内环解耦,省去了锁相环的使用,简化了传统PQ控制的结构,彻底避免了控制系统内环直流解耦分量对控制系统的影响,实现了对交流量的无静差跟踪,使并网电能质量和功率动态响应速度有一定的提高.此外,提出一种全新的参数整定方法对准PR控制器的参数进行设计,以保证控制系统的稳定性和可靠性.构建改进后的锂电池储能并网系统仿真模型,验证了所设计并网系统的可行性和有效性.

Power control of lithium battery energy storage grid-connected system based on quasi-PR control

The lithium battery energy storage system by the traditional PQ control is affected by the DC decoupling component, resulting in power quality and dynamic power compensation performance be affected, and more complex control structure. This paper adopts the grid-connected power control strategy of lithium battery energy storage based on quasi-PR controller. This strategy simplifies the traditional PQ control algorithm and eliminates the need to introduce decoupling components into the control inner loop, eliminating the use of PLL and avoiding the influence of the DC decoupling component of the control system, achieves the zero stady-state error tracking of AC, improves the power quality and response speed of grid-connected. A new tuning method is proposed to design the quasi PR controller to ensure the stability and reliability of the control system.Finally, the improved lithium battery energy storage grid-connected system simulation model is constructed to verify the feasibility and effectiveness of the designed controller.