SRF-PLL环内应用二阶广义积分器的不平衡电压锁相方法

doi:10.11985/2017.09.003

电气工程学报 ›› 2017, Vol. 12 ›› Issue (9): 16-21.doi: 10.11985/2017.09.003

SRF-PLL环内应用二阶广义积分器的不平衡电压锁相方法

谢门喜,朱灿焰,杨勇

苏州大学智能结构与系统研究所苏州 215131

收稿日期:2017-01-18 出版日期:2017-09-25 发布日期:2020-03-27
作者简介:谢门喜男 1984年生,硕士,研究方向为并网同步技术。|朱灿焰男 1962年生,教授,从事信号处理方面的教学与科研工作。
基金资助:
国家自然科学青年基金资助项目(51407124)

SRF-PLL with In-Loop Second Order Generalized Integrator for Unbalanced Three-Phase Systems

Menxi Xie,Canyan Zhu,yong Yang

Institute of Intelligent Structure and Systems Soochow University Suzhou 215131 China

Received:2017-01-18 Online:2017-09-25 Published:2020-03-27

摘要/Abstract

摘要：

并网型电力电子变流设备需要精确实时检测电网电压的相位以实现同步。同步旋转变换锁相方法,若三相电网电压不平衡,经Park变换后,d轴、q轴分量存在二倍频扰动,引起相位偏差信息不准确,导致正序分量相位检测值存在稳态误差。本文分析了二阶广义积分器的带通特性、参数选取原则及数字化实现方式,将其应用于锁相环内进行二倍频检波,通过去耦间接分离出鉴相器中的直流分量,同时衰减其他高次谐波成分。此外,综合系统的动态性和抗扰性,给出了s域下基于二阶最优的环路滤波器参数设计流程。Matlab/Simulink数字仿真结果表明,电网电压不平衡时,相位检测稳态误差为零。最后,实验平台采用TMS320F28335控制器实现算法,测试波形验证了该方法的实际可行性。

关键词: 锁相环, 不平衡电压, 二阶广义积分器, 检波, 数字信号处理器

Abstract:

It is vital to track voltage phase to synchronization control for grid connected power converters. As three-phase grid voltages are unbalanced, the d-axis and q-axis voltage contains disturbances oscillating at frequency of double fundamental. It gives rise to ripple in Phase Detector of Synchronous Reference Frame Phase-Locked Loop (SRF-PLL) and leads positive sequence detected phase angle steady state error. This paper addresses the performance of Second Order Generalized Integrator（SIGO）,which is a band-pass filter that can be used in-loop of SRF-PLL to separate the dc terms and attenuate the other high order frequency components. The digital implementation of SIGO has been given in detail. In addition, by making tradeoff dynamic and disturb of the integrated system, the loop filter parameters design process under s domain based on symmetrical optimum method is given. The simulation has been carried out by Matlab/Simulink, and test results show that the steady error of detected positive sequence phase angle under unbalanced inputs is zero. Experimental results with TMS320F28335 verify the practicability of the idea.

Key words: Phase-locked loop, unbalanced voltages, SIGO, detector, digital signal processor

中图分类号:

TM764

谢门喜,朱灿焰,杨勇. SRF-PLL环内应用二阶广义积分器的不平衡电压锁相方法[J]. 电气工程学报, 2017, 12(9): 16-21.

Menxi Xie,Canyan Zhu,yong Yang. SRF-PLL with In-Loop Second Order Generalized Integrator for Unbalanced Three-Phase Systems[J]. Journal of Electrical Engineering, 2017, 12(9): 16-21.

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k	ω₀	ω_n	$\varsigma$
0.3	2π50×2	2π15	$\sqrt{2} /2$
T_s	ω_b	k_p	k_i
0.0001s	2π31.5	133.2865	8882.6439

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SRF-PLL环内应用二阶广义积分器的不平衡电压锁相方法

SRF-PLL with In-Loop Second Order Generalized Integrator for Unbalanced Three-Phase Systems

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