光伏供电系统中母线电压控制的仿真研究

光伏供电系统采用直流微网的结构,直流母线电压稳定才是系统稳定供电的前提.结合光伏电池P-U曲线单峰值以及左右两侧不对称特点,改进扰动观察法追踪最大功率,从能量平衡角度出发使用功率环电流环的双闭环控制策略缓解能量波动,稳定了母线电压,光伏能源得以最大限度的使用.仿真结果表明,随着环境变化光伏电池能快速工作在最大功率状态而且扰动损失明显减少,直流母线电压都可以稳定在600V,符合系统正常工作及逆变要求.

Simulation Research on Busbar Voltage Control in PV Power System

PV power supply system adoptsa DC micro network structure, but the voltage stabilization of DC busbarisjusta prerequisite to a system stability supply. Combined with a photovoltaic cell P - U single peak curve as well as the leftand right sides of the asymmetric characteristics, improve the disturbance observation track maximum power, from theperspective of energy balance using power loop and current loop of double closed loop control strategy to balance energyfluctuation, stable the busbar voltage, photovohaic power has made full use. The simulation results show that with environ-ment change PV cells can always work in the high power condition and disturbance loss decreased significantly, DC busvoltage can be stabilized in 600V, accord with the requirement of the system to work normally and the inverter.