Abstract
Fluctuating photovoltaic (PV) output power reduces the reliability in power system when there is a massive penetration of PV generators. Energy storage systems that are connected to the PV generators using bidirectional isolated dc-dc converter can be utilized for compensating the fluctuating PV power. This paper presents a grid connected energy storage system based on a 2 kW full-bridge bidirectional isolated dc-dc converter and a PWM converter for PV output power leveling. This paper proposes two controllers: a current controller using the d-q synchronous reference and a phase-shift controller. The main function of the current controller is to regulate the voltage at the high-side dc, so that the voltage ratio of the high-voltage side (HVS) with low-voltage side (LVS) is equal to the transformer turns ratio. The phase-shift controller is employed to manage the charging and discharging modes of the battery based on PV output power and battery voltage. With the proposed system, unity power factor and efficient active power injection are achieved. The feasibility of the proposed control system is investigated using PSCAD simulation.
Highlights
Many countries are implementing PV solar panels as they are a clean and sustainable source to meet their power demands
In addition to the power circuit of the converters, a reliable control system is required for two main purposes. It is to manage the power flow in both directions, achieving charging and discharging modes of the battery. It is to adjust the voltage of high-voltage side (HVS) with respect to the voltage of low-voltage side (LVS) of the converter so that the voltage ratio of the HVS with LVS is close to the transformer turns ratio [10]
While the 2 kW bidirectional isolated dc-dc converter operates to regulate the power at the PCC, the proposed control system continuously adjusts the voltages of HVS so that the voltage ratio of the HVS with LVS is close to the transformer turns ratio, resulting in increasing the converter efficiency
Summary
Many countries are implementing PV solar panels as they are a clean and sustainable source to meet their power demands. The bidirectional full-bridge isolated dcdc converter is a reliable system with high efficiency for PV applications in order to remove probable fluctuations and stabilize the PV output. In addition to the power circuit of the converters, a reliable control system is required for two main purposes It is to manage the power flow in both directions, achieving charging and discharging modes of the battery. It is to adjust the voltage of HVS with respect to the voltage of LVS of the converter so that the voltage ratio of the HVS with LVS is close to the transformer turns ratio [10]. A 6 kW bidirectional isolated dc-dc converter connecting a Li-ion battery bank to the utility grid via a PWM converter
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