A Stabilization Control Method of Supercritical Reduced-Order Medium-Voltage DC Distribution System Based on Taylor Expansion

doi:10.11930/j.issn.1004-9649.202012006

Electric Power ›› 2021, Vol. 54 ›› Issue (10): 73-80.DOI: 10.11930/j.issn.1004-9649.202012006

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A Stabilization Control Method of Supercritical Reduced-Order Medium-Voltage DC Distribution System Based on Taylor Expansion

YUAN Yubo¹, YI Wenfei¹, ZHAO Xueshen^2,3, ZHU Lin^2,3, WANG Yizhen^2,3, LIU Haitao⁴

1. Electric Power Research Institute of State Grid Jiangsu Electric Power Co., Ltd., Nanjing 211103, China;
2. Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China;
3. Key Laboratory of Smart Energy & Information Technology of Tianjin Municipality, Tianjin 300072, China;
4. China Electric Power Research Institute, Beijing 100192, China

Received:2020-12-03 Revised:2021-03-30 Online:2021-10-05 Published:2021-10-16
Supported by:
This work is supported by National Key Research and Development Program of China (No.2018YFB0904700)

Abstract

Abstract: In this paper, a typical medium voltage DC (MVDC) distribution system is taken as the research object, its supercritical reduced-order model is also established, and the effect of constant power load (CPL) on the system stability is also studied. The negative incremental resistance of CPL will lead to the voltage oscillation and instability of the system, which will adversely affect the stable operation of the system. For this reason, a stabilization control method which can improve the voltage stability of MVDC distribution system is proposed in this paper. The position of the dominant pole in the s-domain plane can be changed, which is due to the decentralized and flexible design of key control parameters in state feedback control, droop control and voltage control, and the stability of MVDC distribution system is improved. The simulation results verify the rationality of the supercritical reduced-order model and the effectiveness of the stabilization control method based on Taylor expansion.

Key words: medium voltage DC distribution system, Taylor expansion, damping factor, supercritical reduced-order model, stabilization control method

YUAN Yubo, YI Wenfei, ZHAO Xueshen, ZHU Lin, WANG Yizhen, LIU Haitao. A Stabilization Control Method of Supercritical Reduced-Order Medium-Voltage DC Distribution System Based on Taylor Expansion[J]. Electric Power, 2021, 54(10): 73-80.

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A Stabilization Control Method of Supercritical Reduced-Order Medium-Voltage DC Distribution System Based on Taylor Expansion

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