永磁直驱风电机组低电压穿越时的有功和无功协调控制

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摘要为提高基于全功率变流器并网的永磁直驱风电机组低电压穿越能力,在深入研究该风电机组运行特性和控制策略的基础上,分析了电网电压跌落过程中引起全功率变流器直流侧电压波动的原因,提出了一种采用机侧变流器控制直流电压稳定,网侧变流器实现最大功率跟踪和有功无功协调的新型控制策略。在低电压穿越过程中,该控制策略根据变流器直流侧电压的变化,通过机侧变流器调节风力发电机的电磁功率,使电网故障期间风电机组的功率波动由发电机转子承担,消除全功率变流器两端的功率不平衡,稳定直流侧电压。并根据电网电压幅值,通过网侧变流器实现对风电机组输出有功和无功的协调控制,抑制电网电压扰动。仿真结果表明本文所提控制策略在电网电压扰动时能有效抑制直流侧电压波动,使永磁直驱风电机组的低电压穿越能力得到显著提高,并能有效实现对电网电压的支持。

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	李和明
	董淑惠
	王毅
	任亚钊

关键词 ：风力发电, 永磁同步发电机, 低电压穿越, 有功无功协调, 最大功率跟踪

Abstract：This paper investigates the control and operation of the mutil-pole permanent magnet synchronous generator (PMSG)-based wind generation systems employing the full-scale frequency converter under network fault conditions. The factors inducing the DC-link voltage oscillations during grid voltage dips are analyzed,and a novel control strategy is proposed. In the novel control scheme,the generator-side converter is employed to maintain a stable DC-link voltage,while the grid-side converter is used to realize the maximum power point tracking (MPPT) and the coordinated control for the active and reactive power. According to the DC-link voltage variation during the grid voltage dips,the generator-side converter is controlled to regulate the PMSG electromagnetic power,which translates the unbalance power of the DC-link side into the generator rotational rotor so as to maintain the constant DC-link voltage. Meanwhile,the grid-side converter is employed to realize the coordinated control strategy for the active and reactive power output of the grid-side converter according to the grid voltage change level. The simulation results implemented in Matlab/Simulink show that the proposed control strategy in this paper not only significantly improves the LVRT capability of PMSG by means of suppressing the DC-link voltage oscillation during voltage dips,but also effectively provides a dynamic reactive power support to contribute to the grid voltage recovery.

Key words： Wind power generation permanent magnet synchronous generator low voltage ride through coordinated control for active and reactive power maximum power point tracking

收稿日期: 2012-01-06 出版日期: 2013-12-11

PACS:

TM614

基金资助:国家自然科学基金资助项目（50977028,51277072）。

引用本文:

李和明，董淑惠，王毅，任亚钊. 永磁直驱风电机组低电压穿越时的有功和无功协调控制[J]. 电工技术学报, 2013, 28(5): 73-81. Li Heming,Dong Shuihui,Wang Yi,Ren Yazhao. Coordinated Control of Active and Reactive Power of PMSG-Based Wind Turbines for Low Voltage Ride Through. Transactions of China Electrotechnical Society, 2013, 28(5): 73-81.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2013/V28/I5/73

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