| 不平衡电网电压下双馈风力发电系统强励控制 |
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| 引用本文： | 王萌,施艳艳,王海明,沈明辉. 不平衡电网电压下双馈风力发电系统强励控制[J]. 测控技术, 2014, 33(7): 88-92 |
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| 作者姓名： | 王萌 施艳艳 王海明 沈明辉 |
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| 作者单位： | 河南师范大学 河南省光伏材料重点实验室;河南师范大学 河南省光伏材料重点实验室;国网河南省电力公司新乡供电公司;国网河南省电力公司新乡供电公司 |
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| 基金项目： | 河南省教育厅科学技术研究重点项目(13B470083);河南师范大学博士科研启动基金(01026500122，01026500119) |
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| 摘 要： | 针对电网电压不平衡造成的双馈风力发电机(DFIG)定子有功和无功功率振荡、电磁转矩脉动、定、转子电流不平衡等问题,提出了一种双馈风力发电系统转子侧变换器强励控制方案。推导了不平衡电网电压下DFIG定子有功、无功功率的二次谐波分量在同步旋转坐标系中的表达式,并以此为依据设计了电压强励补偿环。分析了有功、无功功率,电磁转矩及定、转子电流二次谐波分量之间的关系,采用单一强励补偿控制器对不同控制目标进行切换强励控制。对1.5MWDFIG系统的控制特性研究验证了所提控制策略的可行性和优越性。
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| 关 键 词： | 双馈风力发电机 电压不平衡 二次谐波 强励控制 |
Forced Excitation Control of Wind Power System with Doubly Fed Induction Generator Under Unbalanced Grid Voltage Conditions |
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| Abstract: | Unbalanced voltage causes the problems of stator/rotor current unbalance,stator active/reactive power oscillations,and electromagnetic torque pulsations in wind power system with doubly-fed induction generator.In view of these problems,a forced excitation control scheme is presented for rotor-side converters of wind power system with doubly-fed induction generator.The second harmonics of stator active/reactive power under synchronization reference frame are calculated for wind power system with doubly-fed induction generator in the condition of unbalanced voltage.Then forced-excitation compensation for voltage is designed.The relationships among the second harmonics of stator/rotor current,stator active/reactive power and electromagnetic torque are analyzed.A single forced-excitation compensation part is used to switch forced-excitation control of various targets.The feasibility and advantage of the proposed control scheme is verified by research results on a 1.5 MW wind power system. |
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| Keywords: | doubly-fed induction generator unbalanced voltage second harmonics forced excitation control |
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