中文摘要：

针对光伏发电输出电压的间歇性、随机性问题,提出分布式光储直流供电系统的电压稳定协调控制,实现高可靠性和高品质供电。针对光伏/储能电源输出低电压、大电流,且纹波大特点,提出三相交错并联变流器拓扑,有效抑制光伏输出电压波动。光伏升压变流器设计改进的极值搜索法,实现光伏系统最大功率点跟踪,改善传统算法动态性能。针对光伏输出电压波动问题,储能双向变流器采用电压-电流双环控制策略,采用非线性微分平滑控制方法设计外环电压环,实现系统直流母线电压稳定控制的同时,确保存在负载突变或控制参数摄动的情况下,系统依然能够快速跟踪直流母线电压期望值。结合内环电流环的线性PI控制,实现分布式光储直流供电系统功率平稳,供电可靠。基于Matlab/Simulink的仿真结果表明,所提出的非线性微分平滑控制方法具有结构简单、稳态误差小、系统稳定性好等特点。

英文摘要：

To overcome the intermittency problem, this paper proposes a DC bus stabilization coordinated control method of distributed photovoltaic-energy storage（PV-ES） DC generation system. For the low-voltage and high-current output characteristics of the PV module and the battery, three-phase parallel converters are adopted in the proposed system, which can effectively inhibit output voltage fluctuation. For PV converters, an improved extremum seeking algorithm is designed to achieve maximum power output. For ES bidirectional converters, a voltage current dual-loop control algorithm is proposed. Based on flatness principle, an outer voltage loop control law is derived, the control algorithm can improve the DC bus stabilization with control parameter perturbation or a load mutation in a large range. Combined with inner current loop control, the control algorithm can significantly smooth the output power. Simulation model is constructed in Matlab/Simulink platform, the results show that the proposed algorithm has a higher stability and a smaller static error.