Research on Control Strategy of Self-Powered Circuit in Medium Voltage DC Distribution Network Based on PI-MPC

doi:10.16628/j.cnki.2095-8188.2025.11.003

Abstract

Abstract:

The medium voltage DC distribution network is a networking method for efficiently interconnecting different types of distributed power sources and DC loads.In the application scenario of full DC high voltage,aiming at the power supply of secondary equipment without relying on external AC power source, the traditional AC self-powered supply technology based on the mutual inductance principle is difficult to apply.Therefore,a high step-down ratio isolated DC/DC circuit is proposed.The self-powered supply for secondary equipment is realized through module input series and output parallel (ISOP) in medium voltage DC distribution networks.At the same time,a dual closed-loop control strategy based on PI-MPC is designed to improve the fast dynamic response of the voltage and current of the power supply.Finally,simulation analysis and prototype experiments are conducted.The results show that the proposed circuit and control strategy effectively improve the dynamic response performance of the system.

Key words: DC distribution network, secondary equipment self-powered, input series output parallel structure, model predictive control (MPC)

CLC Number:

TM46

ZHOU Qi, ZHANG Zhengtao, ZHANG Jinghao, ZHANG Chenyu, ZHANG Liang. Research on Control Strategy of Self-Powered Circuit in Medium Voltage DC Distribution Network Based on PI-MPC[J]. LOW VOLTAGE APPARATUS, 2025, 0(11): 20-25.

Figures/Tables 11

References 24

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参数	数值	参数	数值
总输入电压U_M/V	1 000	匝比n	5∶1
输出电压U_o/V	24	励磁电感L_m/μH	500
开关频率f_s/kHz	20	输入稳压电容C_in/μF	240
负载电阻R_Load/Ω	5	输出稳压电容C_o/μF	800

参数	数值	参数	数值
反激子电路数	2	变压器励磁电感L_m1/μH	470.8
总输入电压U_M/V	30	变压器励磁电感L_m2/μH	487.3
输出电压U_o/V	3	输入稳压电容C_in/μF	240
开关频率f_s/kHz	10	输出稳压电容C_o/μF	800
变压器匝比	2∶1	负载电阻Z₃、Z₄/Ω	3