电网技术Issue(7)：2000-2005,6.
并网逆变器无锁相环基准正弦的实现方法
An Approach to Obtain Reference Sinusoidal Signal for Grid-Connected Inverter Without Phase-Locked Loop
杨艺云 1廖波 2周林 2晁阳 2司传涛1
作者信息
- 1. 广西电网公司电力科学研究院，广西壮族自治区 南宁市 530023
- 2. 输配电装备及系统安全与新技术国家重点试验室 重庆大学，重庆市 沙坪坝区 400044
- 折叠
摘要
Abstract
It is necessary for grid-connection of distributed generation system to make the inverter output current strictly kept the same frequency and phase as those of grid voltage, thus the key point is to obtain the reference sinusoidal signal that is synchronic to power grid. Since in actual grid-connected system the grid voltage distortion and grid frequency deviation seriously affect the accuracy of reference sinusoidal signal detected by phase-locked loop (PLL), an approach to obtain reference sinusoidal signal is proposed, in which only single-phase voltage is utilized to attain the reference sinusoidal signal with the same frequency and phase angle as those of grid voltage without PLL. The sinusoidal signal obtained by the proposed approach is not affected by the distortion, multi-times of zero-crossing and unbalance of grid voltage. To ensure the effectiveness of the proposed algorithm, the initial value of second-order low-pass active filter should be set to extract low-frequency signal. The feasibility of the proposed method is verified by simulation results and experimental results.关键词
并网系统/同频同相/电压畸变/基准正弦Key words
grid-connected system/with the same frequency and phase angle/voltage distortion/reference sinusoidal signal分类
信息技术与安全科学引用本文复制引用
杨艺云,廖波,周林,晁阳,司传涛..并网逆变器无锁相环基准正弦的实现方法[J].电网技术,2013,(7):2000-2005,6.
