三相并网系统的一种快速相位检测方法

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摘要

在三相并网系统中,要求三相锁相环技术能够快速准确地检测电网电压相位信息,并且抗扰能力强、响应速度快。提出一种区别于传统的基于同步旋转坐标系三相并网系统锁相方法的相位检测方法,该方法通过分析三相电网电压的瞬时值在三相电压绝对值之和中所占的比值与相位角之间的关系,利用二者之间的对应关系,通过查表计算的方法直接求出当前实际的电网电压相位,能够快速、无延时地得出相位信息,且无需进行Park坐标变换。在电网电压不平衡及谐波含量较大导致电网电压畸变等异常情况下,电网电压中会含有负序以及谐波分量,传统锁相方法和该文所提锁相方法都无法精确地追踪相位信息,所以该文又通过采用双二阶广义积分器的方法提取电网电压的正序分量以及滤除低频谐波,然后将正序分量通过该文锁相方法计算得到相位信息。此相位检测方法操作简便、易于实现。最后,对所提相位检测方法进行了实验验证,并与传统方法进行了对比,证明了该方法的有效性。

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	赵红雁
	李艳
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	梁美

关键词 ：锁相环, 双二阶广义积分器, 不平衡电网电压, 正序分量

Abstract：

Detecting the phase angle information quickly and accurately is very important in three phase grid connected system and the immunity of the detecting method should be good.This paper proposes a phase locked loop (PLL) method which is different from the traditional synchronous rotating frame PLL (SRF-PLL).This proposed method calculates the phase angle directly by analyzing the corresponding relationship between the ratios of three phase voltages to the sum of three phase voltages′ absolute value and the phase angle.When the three phase voltage is unbalanced or includes harmonics,the positive-sequence component (PSC) of the grid voltage is extracted by the method of double second order generalized integrator (DSOGI),then the phase angle can be detected by the proposed method in this paper with the PSC.Moreover,the proposed method does not need the Park transformation,so it is easy to implement.As a consequence,by comparison with SRF-PLL,the effectiveness and advantage of the proposed method are verified through experiment.

Key words： Phase locked loop double second order generalized integrator (DSOGI) unbalanced grid voltage positive-sequence component

收稿日期: 2016-08-20 出版日期: 2017-03-23

PACS:

TM464

作者简介: 赵红雁男,1988年生,博士研究生,研究方向为三相变流器并网技术及大功率电解电源技术。E-mail:hyzhao2013@126.com李艳女,1977年生,副教授,博士生导师,研究方向为光伏并网逆变器及第三代宽禁带器件应用。E-mail:liyan@bjtu.edu.cn(通信作者)

引用本文:

赵红雁,李艳,杜吉飞,郑琼林,梁美. 三相并网系统的一种快速相位检测方法[J]. 电工技术学报, 2016, 31(增刊2): 67-75. Zhao Hongyan,Li Yan, Du Jifei, Zheng Qionglin,Liang Mei. A Fast Phase Detection Method Applied in Three-Phase Grid Connected System. Transactions of China Electrotechnical Society, 2016, 31(增刊2): 67-75.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I增刊2/67

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