Battery energy storage system for PV output leveling based on bidirectional isolated DC-DC converter

Abstract

A photovoltaic (PV) system has a variable power output that depends on solar irradiance level and ambient temperature. This will be an issue when there is a massive penetration of PV in the future. Therefore, an energy storage system is indispensable to compensate the problem of PV output fluctuations. Battery energy storage system (BESS) employing power electronic converters can be used for compensating the fluctuating PV power. This paper proposes a 2-kW full-bridge bidirectional isolated dc-dc converter that is employed in a BESS with PWM converter for PV output power leveling. This paper also presents a current controller using the DQ synchronous reference frame for regulating voltage at the high-voltage dc side, and a bidirectional power flow control for controlling the output power of the BESS to ensure that the power that is injected to the point of common coupling (PCC) is leveled at 2 kW. The performance of the system is confirmed with PSCAD simulation.Keywords-Bidirectional isolated dc-dc converters, energy storage systems, photovoltaic (PV) output power leveling, battery energy storage system (BESS), point of common coupling (PCC).

Simple control strategy for a PV‐battery system

“…The latter solution seems not to be of common usage. Indeed, most of the research works in the literature analyse the other two solutions, as reported in [3–7]. Instead, in [8], the authors use the last solution where the charge and discharge of the battery is demanded to the dc–ac converter.…”

Fault tolerance and protective schemes for DC power distribution

“…There are various power converters for the storage system with a different number of switches [87]. Among all the power converters, the synchronous boost DC-DC converter [88,89] and the dual active bridge converter [90][91][92][93] Output Capacitor 820 C The distribution generation system in a DC distribution system is usually renewable energy such as photovoltaic and wind energy. For a country in the topical zone such as Singapore has rich sunlight and the photovoltaic is the most common distributed generation source in the DC distribution system.…”