• 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): 122-137.doi: 10.12204/j.issn.1000-7229.2023.03.013

• New Energy Power Generation • Previous Articles     Next Articles

Stability Analysis of Paralleled Boost DC/DC Voltage-Source Interfaced System with Constant Power Load

XIAO Zhaoxia1, LI Pan1(), ZHU Hongchi1, ZHANG Shirong2, CAO Jianing2   

  1. 1. School of Electrical Engineering, Tiangong University, Tianjin 300387, China
    2. School of Control Science and Engineering, Tiangong University, Tianjin 300387, China
  • Received:2022-07-22 Online:2023-03-01 Published:2023-03-02
  • Supported by:
    National Natural Science Foundation of China(51977149);State Key Laboratory of Reliability and Intelligence of Electrical Equipment (Hebei University of Technology) Open Project(EERI_KF2020003)


Aiming at the stability problem of source-load cascade system with constant power load in paralleled Boost DC/DC converter in DC network, the stability of the paralleled Boost DC/DC converters and the load capacity with constant power load are analyzed by eigenvalue method and impedance ratio method. The correctness of the theoretical analysis is verified by the time-domain simulation method, and the advantages and disadvantages of V-I and I-V droop control for the load power sharing are systematically compared in this paper. For multiple paralleled Boost DC/DC converters with resistance load, the stability region of controller parameters does not change with the increase of the number of paralleled units. The decrease of virtual impedance in V-I droop system, or the increase of virtual impedance in I-V droop system will lead to the deterioration of system stability. For multiple paralleled Boost DC/DC converters with constant power load, the change of the load capacity of the system is consistent with the stability. With the same virtual impedance, the load capacity of multiple paralleled V-I droop system is greater than that of I-V droop system. This paper provides general design rules for two types of droop control in practical engineering applications of parallel Boost DC/DC converters.

Key words: DC distribution system, boost DC/DC converter, stability analysis, V-I/I-V droop control, constant power load

CLC Number: