光伏并网逆变器电流线性调节器研究进展

 光伏并网逆变器是光伏电源与电网连接的电能转换与控制设备, 对并网点电能质量控制起着关键作用。目前光伏并网逆变器中电流控制策略众多, 调节器种类繁多, 各种调节器从结构、实现手段及控制效果上相差较大。本文针对光伏并网逆变器直接电流控制策略的线性调节器(主要包括比例积分、比例谐振、无差拍调节器)进行比较, 分别从算法优缺点、实现容易程度、实时性、稳态误差等进行评价, 探讨3 类调节器未来的研究和发展方向。

Current linear regulators of grid-connected photovoltaic inverter: A review

The grid-connected photovoltaic inverter is the interface between photovoltaic energy sources and the grid, and it plays a key role in controlling the quality of grid at the point of common coupling. The current control methods of the PV grid-connected inverter is numerous, and there are a variety of current regulators, but there is a big difference between the regulators in control structure, realization method and effect of control. The PV grid-connected inverters are overviewed in the view of the current linear regulator. The main linear current regulators: proportional-integral, proportion resonance and deadbeat regulators are compared and evaluated in terms of advantage and disadvantage of algorithm, complexity of realization, real-time performance, steady-state error, etc. Some possible future research fields of the linear current regulator are discussed.