Harmonic Model of Static Var Generator and Analysis of Its Resonance Influence

doi:10.11930/j.issn.1004-9649.202203061

Electric Power ›› 2022, Vol. 55 ›› Issue (9): 174-182.DOI: 10.11930/j.issn.1004-9649.202203061

• New Energy • Previous Articles Next Articles

Harmonic Model of Static Var Generator and Analysis of Its Resonance Influence

LIU Ke¹, WANG Xuan¹, WANG Yang², WANG Xin³, YANG Fangnan⁴, LI Jianwu⁴, LIU Dongping⁵, GUO Cai⁵, ZHANG Qisheng⁵, CHEN Haimeng²

1. Electric Power Research Institute, State Grid Qinghai Electric Power Company, Xining 810008, China;
2. College of Electrical Engineering, Sichuan University, Chengdu 610065, China;
3. CEIEC Shenzhen Electric Technology Inc., Shenzhen 518000, China;
4. State Grid Qinghai Electric Power Company, Xining 810008, China;
5. Maintenance Company of State Grid Qinghai Electric Power Company, Xining 810008, China

Received:2022-03-21 Revised:2022-06-08 Published:2022-09-20
Supported by:
This work is supported by Science and Technology Project of State Grid Qinghai Electric Power Company (Resonance Analysis and Elimination Technology Research and Application of 35 (10) kV Ungrounded System in Typical Substation of Qinghai Power Grid, No.52280720002Q), National Natural Science Foundation of China (Study on Dynamic Process Characterization and Instability Mechanism of Harmonic Oscillation in AC/DC System Under Transient Disturbance Excitation, No.52177104).

Abstract

Abstract: Static var generators (SVGs) are widely used in photovoltaic (PV) stations because of their fast response speed and wide regulation range, which can meet such needs of the system as dynamic reactive power compensation. However, the existing research lacks the analysis of the harmonic interaction between SVGs and PV stations and power grids, and it often ignores the impact of SVGs on the harmonic resonance of PV stations. To solve this problem, this paper builds a new SVG model in the form of harmonic coupling impedance on the basis of multi-frequency harmonic response. The model can fully reveal the frequency coupling effect in the system and can be used to quantitatively analyze the influence of SVGs on the harmonic resonance of PV stations. Finally, the time-domain simulations of an actual PV station verify the correctness of the proposed harmonic impedance model and the importance of frequency coupling in harmonic resonance analysis.

Key words: static var generator, multi-frequency harmonic response, harmonic impedance, frequency coupling, harmonic resonance

LIU Ke, WANG Xuan, WANG Yang, WANG Xin, YANG Fangnan, LI Jianwu, LIU Dongping, GUO Cai, ZHANG Qisheng, CHEN Haimeng. Harmonic Model of Static Var Generator and Analysis of Its Resonance Influence[J]. Electric Power, 2022, 55(9): 174-182.

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Harmonic Model of Static Var Generator and Analysis of Its Resonance Influence

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