Power System with Modular Three-Port Converters for Distributed Loads

Abstract

Abstract:

A novel power system for distributed loads (PSDL)with modular three-port converters (TPC) and its power management were proposed for spacecraft in this paper. The PSDL was composed of several TPC modules, interfacing energy source, energy storage element (ESE) and distributed loads, with the input and bidirectional ports connected in parallel, respectively. Considering that the output loads are distributed and there are three power paths in each TPC, it's difficult to determine the power transferred on each path of the PSDL. To achieve accurate power distribution of the multiple ports, a system level hybrid power control was proposed, i.e., current-sharing control when the ESE charges and power control based on requirements of loads when the ESE discharges. With the proposed control, the PSDL can achieve stable operations under different working states and smooth switching between them. Experimental results demonstrate the feasibility and effectiveness of the proposed system structure and hybrid power control.

Key words: Three-port converter, DC distributed power system, spacecraft power system, distributed control, DC microgrid

CLC Number:

TM464
V44

Zhang Junjun,Wu Hongfei,Ge Hongjuan,Xing Yan,Cao Feng. Power System with Modular Three-Port Converters for Distributed Loads[J]. Journal of Electrical Engineering, 2015, 10(4): 91-98.

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参数	数值	参数	数值
输入电压/V	40~60	输入功率/W	0~250
输出电压/V	28	输出功率/W	200
蓄电池电压/V	22~26	输入滤波电容/μF	330
输出滤波电容/μF	200	变压器励磁电感/μH	36
输出滤波电感/μH	100	变压器匝比	1.75
一次侧开关管	IRFS4321	二次侧开关管	IRFS4229
开关频率/kHz	100	DSP	MC56F8247