基于无通讯的微电网储能系统主动SOH协同控制方案

ACTIVE SOH COOPERATIVE CONTROL SCHEME OF MICROGRID ENERGY STORAGE SYSTEMS BASED ON NO-COMMUNICATION

针对传统有功功率-频率(P-f)下垂控制无法实现交流微电网内分布式电池储能系统(DBESS)健康状态(SOH)均衡问题,提出一种基于无通讯的微电网DBESS主动SOH协同控制方案。该方案研究下垂控制调节SOH机理,将DBESS放电深度(DOD)信息加入传统下垂控制,使DBESS能根据SOH状态平移下垂曲线,调节DBESS逆变器输出有功功率,实现DBESS组间SOH协同控制。建立小信号模型分析控制参数对系统稳定性的影响。该方案属于主动控制方案,具有无通讯和分流电阻、造价低的优点。通过仿真模型和实验平台对所提策略的可行性和有效性进行验证。

Aiming at the problem that the traditional P-f droop control cannot achieve the state of health(SOH)balance of distributed battery energy storage systems(DBESS)in the AC microgrid,this paper proposes an active SOH cooperative control scheme for DBESS in the microgrid based on no communication.The scheme studies the mechanism of droop control to adjust SOH,and adds the depth of discharge(DOD)information of DBESS to the traditional droop control,so that DBESS can translate the droop curve according to the SOH state,adjust the output active power of DBESS inverter,and realize the SOH cooperative control between DBESS groups.A small signal model is established to analyze the influence of control parameters on system stability.This scheme is an active control scheme,which has the advantages of no communication and shunt resistance and low cost.The feasibility and effectiveness of the proposed strategy are verified by simulation model and experimental platform.