摘要
提出了一种适用于直流微电网负荷不平衡的电压平衡器控制方法,为直流微电网系统用户端提供稳定可靠的直流供电。根据电压平衡器主电路拓扑结构,通过状态空间平均法对其建立小信号模型,在电路模型分析的基础上引入PWM控制技术,采用PI环节实现输出电压的平衡控制,保证平衡器输出端的稳定,抑制负荷扰动对直流输出电压的影响。利用MATLAB仿真软件搭建了15kW的实验样机,并在负荷变动的情况下对电压平衡器进行仿真验证。仿真结果表明了理论的正确性及所提出控制策略的有效性。
A control strategy of voltage balancer which is suitable for DC micro-grid load unbalance is proposed to provide a stable and reliable DC power for DC micro-grid system clients.According to voltage balancer main circuit topology,the small signal model of voltage balancer was established through state space averaging method.PWM control technology and PI sectors were introduced on the basis of the analysis of the circuit model to achieve the output voltage balance control and ensure the stability of the output of the balancer.It also suppresses the influence of load disturbance on the DC output voltage.A prototype with capacity size of 1 5 kW was built in MARTALB simulation software and the case of load variations on voltage balancer was simulated to verify the proposed method.Simulation results show the correctness of the theory and validity of proposed control strategy.
出处
《电子测量技术》
2015年第10期32-35,40,共5页
Electronic Measurement Technology
