Subproportion control of double input buck converter for fuel cell/battery hybrid power supply system

• Published in: IET power electronics Vol. 7; no. 8; pp. 2141 - 2150
• Main Authors: Xian, Liang, Wang, Gucheng, Wang, Youyi
• Format: Journal Article
• Language: English
• Published: Stevenage The Institution of Engineering and Technology 01.08.2014; The Institution of Engineering & Technology
• Subjects: autoMT function; auxiliary circuits; battery REHS prototype; battery storage plants; circuit structure; control system synthesis; Control systems; Control theory; controller design; cost reduction; current controlling duty cycle; double‐input‐buck‐converter‐based fuel cells; dual‐source‐powered mode; duty cycle; electric current control; energy management; energy management systems; fuel cell power plants; fuel cell‐battery hybrid power supply system; hybrid power systems; Hybrid systems; Mathematical models; MIC; mode transition; Modelling; multiple‐input converter; parallel connected single‐input converter topology; power 1 kW; power convertors; REHSs; Renewable energy; renewable energy hybrid systems; single‐source‐powered mode; small signal modelling; Sole; SPC approach; subproportion control approach; Topology; voltage control; voltage controlling duty cycle; battery REHS prototype; autoMT function; controller design; small signal modelling; single-source-powered mode; duty cycle; electric current control; fuel cell power plants; parallel connected single-input converter topology; REHSs; circuit structure; energy management; fuel cell-battery hybrid power supply system; current controlling duty cycle; hybrid power systems; mode transition; cost reduction; voltage controlling duty cycle; power convertors; MIC; MT; power 1 kW; control system synthesis; double-input-buck-converter-based fuel cells; dual-source-powered mode; energy management systems; auxiliary circuits; renewable energy hybrid systems; battery storage plants; subproportion control approach; multiple-input converter; SPC approach; voltage control
• ISSN: 1755-4535; 1755-4543; 1755-4543
• DOI: 10.1049/iet-pel.2013.0353

Characterised with more integrated topology, simpler manipulations, less component count, and comparative higher efficiency, multiple-input converters (MICs) become an attractive candidate in renewable energy hybrid systems (REHSs). To seamlessly and smoothly transit from one operating mode to another is one of the critical issues that the energy management strategy should concern about. Normally, the mode transition (MT) design is usually required for the auxiliary circuits and components, which runs opposite to the MIC's intrinsic advantages and may cause potential problems for the system's reliability and stability. The subproportion control (SPC) approach presented in this study combines two operating modes into a sole control algorithm module without any hardware assistance. The so-called subproportion (SP) term is an additional control variable served as a certain proportion of the voltage-regulation duty cycle, dv. The product of SP and dv composes the duty cycle for current limitation of the first power source, beyond which, a seamless and smooth MT can be automatically and spontaneously implemented. The small-signal modelling for the three most-commonly-used topologies in the MIC family showed SPC's universal applicability. It was employed onto a 1 kW double-input-buck-converter-based fuel cells/battery REHS prototype for the verification of its control performance and auto-MT capability.