电网电压不平衡时风电变流器网侧控制策略研究

Control Strategy Research of Grid Side Converter in Wind Turbine under Unbalanced Grid Voltage Condition

近年来,风力发电对电网的适应性问题变得越来越尖锐,电网电压不平衡就是其中之一。文章提出一种电网电压不平衡时的网侧变流器控制方法。在常规变流器控制算法中,加入了负序电流抑制算法,在不影响常规风电变流器控制的前提下,达到了适应电网电压不平衡的目的,具有较强的现实意义。

Recently, grid adaptability problems become more and more distinct in wind power, one of these problems is unbalanced grid voltage. This paper presents a new control strategy of grid side converter in wind turbine under unbalanced grid voltage condition, which adds negative sequence current inhibition algorithm to the conventional control algorithm. Using this strategy, the purpose of grid voltage unbalance adaptability is achieved, without affecting the conventional control of wind turbine converter. The new control strategy has strong practical significance.