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风电电网侧变流器在不平衡电压条件下的控制研究

Study on Control of Grid-side Converter in Wind Power System under Unbalanced Grid Voltage Conditions
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摘要 为了提高采用LCL滤波的电网侧变流器在电网电压不平衡情况下的工作性能,文章对变流器在上述条件下的数学模型进行了理论分析,给出了基于LCL滤波器的不平衡电流指令算法,并提出了在同步旋转dq坐标系下采用PI调节器和重复控制器并联结构的电流复合控制方案。文章提出的电流控制策略可有效减少电网电流中的低次谐波含量,并提高直流电压的稳定性。为了抑制LCL滤波器在系统暂态时产生的振荡,文章还采用了电容电流抑制谐振的有源阻尼方案。最后通过一台5 kW样机试验验证了该理论的正确性。 To improve working performance of grid-side converter with LCL filter in wind power system under unbalanced grid voltage conditions,the mathematical model of converter has been set up and analyzed theoretically.Unbalanced grid current instruction algorithm for grid-side converter with LCL filter and compound current control strategy based PI adjusters and repetitive controllers in positive synchronous dq frame are proposed in this paper.With novel control strategy low order harmonics of converter can be reduced effectively and the stability of DC current can be enhanced.To damp resonance of LCL filter,filter capacitor current is proposed for active damping.Finally,theoretical analysis and experimental results verify the correctness of the proposed control strategy.
作者 张宪平 潘磊 秦明
机构地区 国电联合动力技术有限公司
出处 《大功率变流技术》 2011年第5期30-36,共7页 HIGH POWER CONVERTER TECHNOLOGY
关键词 不平衡电网电压 风力发电 LCL滤波器 电网侧变流器 复合控制 unbalanced grid voltage wind power LCL filter grid-side converter compound control
分类号 TM614 [电气工程—电力系统及自动化] TM46 [电气工程—电器]
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参考文献21

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二级参考文献20

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大功率变流技术
2011年 第5期

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