Research on DC Component Suppression Method of Non-isolated Grid-Connected Inverter

IF 1.6 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC
Huige Chen, Shuangling Wang
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Abstract

The zero drift occurring to the sampling conditioning circuit of the non-isolated grid-connected inverter will make the output develop a DC component, thus resulting in system failure and posing safety risks. According to the IEEE standard 1547-2003, the DC component injected into the grid side should be less than 0.5% of the rated current. In this paper, a moving average filter is proposed to extract the DC component of the three-phase AC output current. The filter has a very strong attenuation ability to the fundamental integer multiple harmonics, and can accurately extract the DC component. Then the proportional integral resonant controller (PIR) is used to control the system. The control system has sufficient bandwidth to avoid the stability problem caused by frequency offset. Through the above methods, the purpose of accurately suppressing the DC component in the non-isolated grid-connected inverter is realized. Also, a 50 kVA prototype is built in this study. The experimental results show that the moving average filter is advantageous over the conventional low-pass filter method in extracting the DC component, and the PIR controller used in the closed-loop control system outperforms the proportional integral and proportional resonant controllers. Under the strategy proposed in this study, the DC component is reduced to less than 0.5% of the rated current, and the THD of the grid-connected current falls below 5%.

Abstract Image

非隔离并网逆变器直流分量抑制方法研究
非隔离式并网逆变器的采样调节电路发生的零点漂移会使输出产生直流分量,从而导致系统故障并带来安全风险。根据 IEEE 标准 1547-2003,注入电网侧的直流分量应小于额定电流的 0.5%。本文提出了一种移动平均滤波器,用于提取三相交流输出电流中的直流分量。该滤波器对基波整数多次谐波有很强的衰减能力,能准确提取直流分量。然后使用比例积分谐振控制器(PIR)对系统进行控制。该控制系统具有足够的带宽,避免了频率偏移引起的稳定性问题。通过上述方法,实现了精确抑制非隔离并网逆变器中直流分量的目的。本研究还建立了一个 50 kVA 的原型。实验结果表明,与传统的低通滤波器方法相比,移动平均滤波器在提取直流分量方面更具优势,闭环控制系统中使用的 PIR 控制器优于比例积分控制器和比例谐振控制器。在本研究提出的策略下,直流分量降低到额定电流的 0.5%以下,并网电流的总谐波失真(THD)低于 5%。
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来源期刊
Journal of Electrical Engineering & Technology
Journal of Electrical Engineering & Technology ENGINEERING, ELECTRICAL & ELECTRONIC-
CiteScore
4.00
自引率
15.80%
发文量
321
审稿时长
3.8 months
期刊介绍: ournal of Electrical Engineering and Technology (JEET), which is the official publication of the Korean Institute of Electrical Engineers (KIEE) being published bimonthly, released the first issue in March 2006.The journal is open to submission from scholars and experts in the wide areas of electrical engineering technologies. The scope of the journal includes all issues in the field of Electrical Engineering and Technology. Included are techniques for electrical power engineering, electrical machinery and energy conversion systems, electrophysics and applications, information and controls.
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