双馈异步风力发电机优化预测直接功率控制

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摘要提出了一种双馈异步风力发电机(DFIG)的优化预测直接功率控制(P-DPC)策略。讨论了P-DPC的基本原理, 分析了常规P-DPC策略中的电压矢量选择原则, 其中电压矢量作用时间可能出现负值, 并产生较多低次电流谐波, 对此研究了优化的电压矢量选择和作用时间处理方法。对优化P-DPC、常规P-DPC、传统基于查询开关表的DPC及矢量控制策略进行了仿真与实验的对比研究, 结果证明, 优化P-DPC在无需旋转坐标变换和空间矢量脉宽调制情况下实现了固定开关频率, 具有良好的稳态性能, 同时也继承了传统DPC的优异动态性能, 表明了本文所提优化P-DPC方法在DFIG风电系统中应用的可行性和有效性。

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	孙丹
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关键词 ：双馈异步风力发电机, 预测直接功率控制, 电压矢量, 固定开关频率

Abstract：In this paper, a modified predictive direct power control(P-DPC) strategy is presented for doubly fed induction generators(DFIGs). The basic principles of the conventional P-DPC are expounded for DFIGs. A serious drawback of the conventional P-DPC is that the predicted time duration for the active voltage vectors may be less than zero, resulting in significant low order current harmonics. Based on a deep study on the causes to this phenomenon, a modified time duration predicting strategy is proposed. A comparative study by numerical simulation and experimental testing of the modified P-DPC, conventional P-DPC, vector control and look-up table direct power control (LUT-DPC) shows that the modified P-DPC strategy presents much better steady-state and transient performance in comparison with the conventional P-DPC with reduced low-order harmonic currents while it can still maintain the inherent merits of excellent dynamic performance of the conventional LUT-DPC.

Key words： Doubly fed induction generator predictive direct power control(P-DPC) voltage vector fixed switching frequency

收稿日期: 2013-09-13 出版日期: 2014-03-26

PACS:

TM310

基金资助:国家自然科学基金(51277159)和浙江省自然科学基金(LY13E070001)资助项目

作者简介: 孙丹女, 1975年生, 博士, 副教授, 主要研究方向为交流电机高性能控制策略和双馈异步风力发电技术。邓伦杰男, 1989年生, 硕士研究生, 主要研究方向为直接功率控制和变速恒频风力发电技术。

引用本文:

孙丹, 邓伦杰, 孙士涛, Zhu Jianguo. 双馈异步风力发电机优化预测直接功率控制[J]. 电工技术学报, 2013, 28(11): 78-85. Sun Dan, Deng Lunjie, Sun Shitao, Zhu Jianguo. Modified Predictive Direct Power Control of Doubly Fed Induction Generators. Transactions of China Electrotechnical Society, 2013, 28(11): 78-85.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2013/V28/I11/78

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