Abstract
In sustainable energy applications, standalone solar power systems are mostly preferred for self-powered energy zones. In all standalone renewable power systems, batteries are still preferred as the common energy storage device. On the other hand, batteries are not applicable for high peak power demand applications because of their low power density. A supercapacitor is a preferable high-power density energy storage device for high peak power applications. A 2 kW, 50 kHz digital control dual active bridge isolated bi-directional dc-dc converter (DAB-IBDC) was developed for interfacing the supercapacitor bank in standalone solar power system. This paper proposes a blended SPS-ESPS digital control algorithm for a DAB-IBDC converter instead of using a traditional single-phase shift (SPS) control algorithm, which is commonly used for large input to output voltage varying applications. This proposed blended SPS-ESPS control algorithm achieved high power conversion efficiency during a large input to output voltage variation, over a traditional phase shift control algorithm by reducing the back-power flow and current stress in a circuit. This system also achieved maximum power point for solar modules and enhanced rapid charging-discharging for a supercapacitor bank. Both SPS and the blended SPS-ESPS control algorithms were verified experimentally using 2 kW DAB-IBDC topology implemented with standalone power system that combination of 2000 W input solar module and 158 Wh supercapacitor bank.
Highlights
Over the last decade, fossil fuel technology has become less attractive due to the depletion of reserves on Earth
According to previous research based on a digital control algorithm, Extended single-phase control (ESPS) control of research based on a digital control algorithm, ESPS control of an isolated bi-directional dc-dc converter an isolated bi-directional dc-dc converter is improving the system efficiency of the circuit for power is improving the system efficiency of the circuit for power distribution between the energy source distribution between the energy source and energy storage system in micro grids over a wide input and energy storage system in micro grids over a wide input voltage and output power range [19]
The results showed that the blended the blended single-phase shift (SPS)-ESPS digital control DAB-IBDC is more suitable for a standalone renewable power
Summary
Fossil fuel technology has become less attractive due to the depletion of reserves on Earth. Renewable energy sources are believed to be an alternative energy source to replace fossil fuels. Stand-alone photovoltaic systems are commonly preferred in remote areas. A typical stand-alone system incorporates a photovoltaic panel, maximum power point tracker (MPPT), energy storage system, and charging controller [1]. A photovoltaic system is not an ideal dc source for charging energy storage systems gradually because it does not satisfy the desirable requirements of storage devices. The output of such a system is dependent on the frequent changeable weather conditions, which are largely unpredictable. The photovoltaic system output is unreliable and the optimal charge and discharge cycle cannot be guaranteed [2]
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