Research on Influence and Parameter Optimization of Voltage Ride through Control Strategies of Energy Storage in Renewable Energy Power Sending System

Energy storage is an effective means to ensure the consumption of renewable energy and the supply to power consumers in the new power system, which will be widely applied. As energy storage is also a kind of power electronic equipment, its low/high voltage ride through (LVRT/HVRT) transient characteristics will have positive or negative impacts on the safety of power grid, especially on the transient stability and temporary overvoltage (TOV) problems. In order to make full use of the flexible regulation ability of energy storage and make it play a positive role to the safety of power grid, this paper sorted out the typical power transmission mode of large scale renewable energy bases in China and constructed a typical model of wind-solar-thermal-storage combined system. On this basis, the principle of the influence of the LVRT/HVRT transient characteristics of the energy storage on the transient stability of the sending end system and the TOV of renewable energy generation unit is analyzed. Then, the optimization direction of the key control parameters for LVRT/HVRT of energy storage was studied through simulation by PSD-BPA. Finally, the differentiated technical requirements were proposed.