单相并网光伏逆变器引起的谐波畸变

Power System Harmonics - Analysis, Effects and Mitigation Solutions for Power Quality Improvement Pub Date : 2018-05-30 DOI:10.5772/INTECHOPEN.73030

Yang Du, D. Lu

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引用次数: 7

摘要

由于光伏发电装机的快速增长，人们越来越关注光伏逆变器产生的谐波失真。在传统控制结构图的基础上，提出了一种通用模型来分析谐波的产生过程。总结了电流谐波产生的原因，分析了电流谐波与输出功率的关系。特别是对于两级逆变器，与现有模型假设直流(DC)链路电压恒定不同，直流链路电压纹波被识别为一系列奇次谐波的来源。考虑直流链路电压纹波，将逆变器建模为时变系统。推导了一个封闭解来计算波纹引起的谐波的幅值。通过仿真和实验验证了理论推导和分析的正确性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Harmonic Distortion Caused by Single-Phase Grid-Connected PV Inverter

Due to the fast growth of photovoltaic (PV) installations, concerns are rising about the harmonic distortion generated from PV inverters. A general model modified from the conventional control structure diagram is introduced to analyze the harmonic generation pro- cess. Causes of the current harmonics are summarized, and its relationship with output power levels is analyzed. In particular for two-stage inverter, unlike existing models that assume the direct current (DC)-link voltage is constant, the DC-link voltage ripple is identified as the source of a series of odd harmonics. The inverter is modeled as a time-varying system by considering the DC-link voltage ripple. A closed-form solution is derived to calculate the amplitude of the ripple-caused harmonics. The theoretical derivation and anal- ysis are verified by both simulation and experimental evaluation.

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Power System Harmonics - Analysis, Effects and Mitigation Solutions for Power Quality Improvement

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