Grid Voltage Control of Energy Storage System Using Dual Active Bridge Converter

Brief introduction:

The paper presents a grid voltage control strategy for energy storage systems (ESS) using a Dual Active Bridge (DAB) converter. The primary goal of the study is to enhance the stability of DC grid voltage by maintaining consistent power output despite fluctuations in renewable energy sources, such as photovoltaic systems, and varying load conditions. The proposed control method utilizes a digital deadbeat control approach with feedforward control to optimize the response of grid voltage, alongside an output current control mechanism for the DAB converter. The effectiveness of the control scheme is validated through the simulation using DSIM and experimental results, which demonstrate that the system can efficiently regulate charging and discharging processes, maintaining stable DC grid voltage even under steep fluctuations.


Grid voltage control for DAB converter and energy storage system simulation using DSIM

In this paper, DSIM is used to simulate the energy storage system based on a DAB converter, focusing on the charging and discharging switching process under a photovoltaic current (IPV) fluctuation scenario. The system's dynamic response and voltage regulation performance are also analyzed. The simulation is configured with a switching frequency of 10 kHz and a sampling period of 100 µs. Key simulation parameters include transformer leakage inductance (Lr = 111.7 μH), magnetizing inductance (LM = 2.28 mH), and DC capacitor (Cdc = 5600 μF), among others. The results demonstrate that the output current (Idc) can rapidly track the reference value, while the DC grid voltage (Vdc) remains consistently stable at 380 V. Compared to traditional PI control, the proposed method significantly reduces voltage fluctuations, with an amplitude reduction of over 90 %.