基于离散复变量自适应滤波器的三相电网同步算法

发布时间：2018-01-13 05:18

本文关键词：基于离散复变量自适应滤波器的三相电网同步算法　出处：《电力系统自动化》2017年16期 　论文类型：期刊论文

【摘要】：电网同步算法是并网变换器控制算法的重要组成部分,其对于并网变流器控制性能的提高较为重要。文中针对电网同步算法,首先从离散Luenberger观测器设计的角度,设计了一种离散复变量滤波器,用于提取序分量,并针对谐波应用,建立了基于多重复变量滤波器结构的谐波序分量观测器。其次,分析了输入电压频率与所提序分量观测器频率参数不一致时频率误差的传递过程,进而设计了输入电压频率观测方程,从而使得所提序分量观测器能够自适应于电网频率的变化。建立了线性化的频率误差近似动态模型,以便于频率观测增益的选取。最后,采用仿真与实验来验证所提电网同步算法的正确性与有效性,结果表明该算法能够改善电网频率观测动态性能,缩短了频率观测时间,应用实施简单有效,计算量小。
[Abstract]:Grid synchronization algorithm is an important part of grid-connected converter control algorithm, which is important to improve the control performance of grid-connected converter. Firstly, a discrete complex variable filter is designed from the point of view of discrete Luenberger observer design, which is used to extract the sequence components and apply to harmonics. The harmonic sequence component observer based on the multivariable filter structure is established. Secondly, the transmission process of the frequency error is analyzed when the input voltage frequency is inconsistent with the frequency parameters of the proposed sequence component observer. Furthermore, the input voltage frequency observation equation is designed, so that the proposed sequence component observer can adapt to the frequency change of the power network, and a linearized approximate dynamic model of frequency error is established. Finally, the simulation and experiment are used to verify the correctness and effectiveness of the proposed synchronization algorithm. The results show that the algorithm can improve the dynamic performance of power grid frequency observation. The frequency observation time is shortened, the application is simple and effective, and the calculation amount is small.
【作者单位】：东南大学电气工程学院;国网江西省电力科学研究院;
【基金】：国家高技术研究发展计划(863计划)资助项目(2014AA052002) 江苏省产学研前瞻性联合研究项目(BY2015070-13) 国家电网公司科技项目(521820150005)~~
【分类号】：TM761
【正文快照】： 上网日期:2017-04-28。0引言近年来,随着分布式电源大规模接入大电网,并网变流器作为分布式电源与大电网的接口电力电子设备,对其控制的要求越来越高,电网同步技术作为并网变流器关键控制技术,对于提高变换器控制性能较为重要,因而其得到了中外学者的广泛关注[1-2]。目前,常用

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