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

Abstract

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, d v . The product of SP and d v 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.

Soft‐switching bidirectional DC–DC converter with high voltage conversion ratio

“…However, they cannot deliver stable power to the load at all conditions. Hence, energy storage devices including batteries and super-capacitors are always needed in these systems [1][2][3].…”

Extending the power transfer capability of a three‐port DC–DC converter for hybrid energy storage systems

“…The use of hybrid energy storage systems (HESSs) has significantly increased in recent years due to their potential applications in small generating renewable energy systems, able to operate either isolated or as part of micro-grids, among others [1]. HESS can use different kinds of energy storage devices, such as for instance batteries and supercapacitors, taking advantage of the high energy density of one, and the high power density of the other, respectively [2][3][4]. This requires the use of converters with suitable topologies, which allow connecting in parallel different energy storage devices with different characteristics.…”

Compound-Type Hybrid Energy Storage System and Its Mode Control Strategy for Electric Vehicles

“…New energy vehicles have received much attention as a promising solution to the energy crisis and to environmental pollution [1]- [4]. In particular, electric vehicles (EVs) are advantageous over other new energy vehicles in the following ways: no fuel consumption, reduced daily traveling costs, and little noise [5].…”

“…As a result, battery cells are difficult to balance under extreme working conditions [10]. These drawbacks mainly drive the development of auxiliary energy sources and the design of energy management strategies for extending battery life [4], [7], [11], [12].…”