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A low voltage ride through control strategy for energy storage systems

This paper proposes a low voltage ride through (LVRT) control strategy for energy storage systems (ESSs). The LVRT control strategies for wind turbine systems and photovoltaic systems have been researched until now. Regardless of the energy source, the main aim of the LVRT control strategies for a grid side converter is to inject the reactive power according to the gird code regulations. The main aim of the proposed LVRT control strategy for ESSs is the same as them; however, it additionally considers the case of charging state which cannot be taken into consideration in wind turbine systems and photovoltaic systems having unidirectional power flow. The proposed LVRT control strategy for ESSs determines not only the reactive reference current for injecting the reactive power but also the active reference current to contribute to a point of common coupling (PCC) voltage increase by considering the two operating condition of charging and discharging state. The validity of the analysis is verified by simulation results.