Research on Out-of-Step Characteristics and Protection of Grid-Connected Converter

IF 1.6 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC
Yanxia Zhang, Ziyang Zhang, Jinru Song
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引用次数: 0

Abstract

The grid-connected converter synchronizes with the power grid through the controller, so its out-of-step mechanism and out-of-step characteristics are different from synchronous generators. The out-of-step characteristics and out-of-step protection of grid-connected converter are urgent research topics at present. In this paper, the out-of-step mechanism of grid-connected converter under the low voltage ride through (LVRT) control strategy is analyzed by combining the phase plane method and the equal area criterion. The characteristics of current, voltage and measured impedance angle at the point of interconnection (PoI) are analyzed after the grid-connected converter is out-of-step, and compared with those of the traditional power system. On the basis of these, a novel out-of-step protection method for the grid-connected converter is proposed based on the measured impedance angle at the PoI. It judges the out-of-step by the characteristic that the measured impedance angle oscillates continuously and the difference of its extreme values increases gradually. The faster the out-of-step oscillation develops, the faster the protection acts, so it is adaptive. Finally, a MATLAB/Simulink simulation model is built to verify the effectiveness of the proposed protection method.

Abstract Image

并网变流器的失步特性与保护研究
并网变流器通过控制器与电网同步,因此其失步机制和失步特性不同于同步发电机。并网变流器的失步特性和失步保护是当前急需研究的课题。本文结合相平面法和等面积准则,分析了低电压穿越(LVRT)控制策略下并网变流器的失步机理。分析了并网变流器失步后的电流、电压和互联点(PoI)测量阻抗角的特性,并与传统电力系统的特性进行了比较。在此基础上,提出了一种基于 PoI 处测量阻抗角的新型并网变流器失步保护方法。它根据测量阻抗角持续振荡且其极值之差逐渐增大的特点来判断失步。失步振荡发展得越快,保护动作就越快,因此它是自适应的。最后,建立了一个 MATLAB/Simulink 仿真模型,以验证所提出的保护方法的有效性。
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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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