NDLI: Harmonic circulation and DC voltage instability mechanism of parallel-SVG system

Content Provider	IET Digital Library
Author	Chen, Jikai Shao, Hui Cheng, Yiping Wang, Xiaozhe Li, Guoqing Sun, Chu Jiang, Qirong Qin, Jiangchao
Abstract	A parallel static var generator (SVG) system based on cascaded H-bridge topology in wind afflux station is analysed in this study to reveal the mechanism of harmonic current and DC voltage instability due to the phase difference between the PWM carriers. First, the inherent relation of harmonic current and low-frequency disturbance is revealed by carrier-phase-shift pulse-width-modulation (CPS-PWM) theory. Second, to identify the negative impact of low-frequency disturbance, a small-signal circuit model is built to research the electric coupling relation between SVGs and the grid, then pointing out the main factors which affect the harmonic circulation among the two-paralleled SVGs. Third, the output impedance and the transfer function of SVG give an insight into the interaction between SVG and low-frequency resonance characteristics, based on which a virtual resistance method is proposed to shape the resonant peak. Finally, theoretical analysis and system experiment prove that the proposed control strategy can rapidly attenuate low-frequency resonant peaks of the system, avoiding the DC voltage instability in the SVG system when harmonic circulation occurs.
Starting Page	793
Ending Page	802
Page Count	10
ISSN	17521416
Volume Number	14
e-ISSN	17521424
Issue Number	Issue 5, Apr (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rpg/14/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2019.0513
Journal	IET Renewable Power Generation
Publisher Date	2020-01-09
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Bridge Circuit Cascaded H-bridge Topology Control of Electric Power System CPS-PWM Theory DC Voltage Instability Mechanism Electric Coupling Relation Harmonic Circulation Harmonic Current Harmonics Low-frequency Disturbance Low-frequency Resonance Characteristic Other Power Apparatus And Electric Machine Parallel Static Var Generator System Parallel-SVG System Power Converter Power Electronics Power Generation Control Power Grid Power Supplies to Apparatus Power Supply Power Supply Quality Power System Harmonics PWM Power Converter Small-signal Circuit Model Static VAr Compensators Supervisory Circuit Transfer Function Virtual Resistance Method Wind Afflux Station Wind Power Plant
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment

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