• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

ELECTRIC POWER CONSTRUCTION ›› 2023, Vol. 44 ›› Issue (3): 66-76.doi: 10.12204/j.issn.1000-7229.2023.03.007

• Research and Application of Key Technologies for Distribution Network Planning and Operation Optimization under New Energy Power Systems?Hosted by Professor WANG Shouxiang and Dr. ZHAO Qianyu? • Previous Articles     Next Articles

Low-Frequency Admittance Modeling and Stability Analysis of Multiple PSUs Parallel System in Data Center

ZHANG Yuhua1(), SUN Xiaopeng1(), GAO Dengke2, LI Hongbiao2   

  1. 1. School of Electric Power Engineering, Shanghai University of Electric Power, Shanghai 200090, China
    2. Shanghai Keliang Information Technology Co., Ltd., Shanghai 200030, China
  • Received:2022-05-06 Online:2023-03-01 Published:2023-03-02
  • Supported by:
    Shanghai Science and Technology Project(19DZ1205402);Shanghai Science and Technology Innovation Action Plan Project(19DZ2204700)


In view of the interaction between the power supply unit (PSU) inside the data center power supply system and the power distribution network, it is easy to cause low-frequency oscillation in the power supply system of the data center. At present, there is no effective analysis model for the research on the low-frequency oscillation of parallel multiple PSUs in the data center. Therefore, this paper proposes a low-frequency admittance modeling and stability analysis method for parallel multiple PSUs in data centers. On the basis of the low-frequency admittance model of the single-phase PSU, a low-frequency admittance model of parallel multiple PSUs considering the frequency coupling effect and the influence of the DC-side voltage is established by equivalently aggregating the frequency coupling effects of parallel multiple PSUs to improve the accuracy of the impedance model. The low-frequency admittance model of single-phase PSU in the parallel system; and according to the Nyquist stability criterion, the influence of the number, capacity and voltage-loop parameters of the PSU on the system stability is analyzed in detail, and the influence law of each factor on the system stability is obtained. The effectiveness of the proposed method is verified by simulation, and a reliable analysis model is provided for the planning, design and stable operation of the data center power system.

Key words: data center, parallel multiple PSUs, low-frequency oscillation, frequency coupling, system stability

CLC Number: