Methods, devices, equipment, and readable storage media for electromechanical transient modeling of energy storage systems

Abstract

This application provides a method, apparatus, device, and readable storage medium for electromechanical transient modeling of an energy storage system. The method utilizes a preset circuit model to connect the energy storage system to an AC system. Since the preset circuit model includes an equivalent current source and an equivalent voltage source, and the amplitude of the equivalent voltage source is equal to the voltage reference value at the energy storage system connection point, and the phase angle is equal to the actual voltage phase angle at the energy storage system connection point, the connection of the equivalent voltage source can maintain the voltage at the energy storage system connection point as close to the target value as possible without affecting the active power output of the energy storage system. This application can calculate the total output current of the energy storage system using the target voltage value at the energy storage system connection point, the actual voltage value at the connection point, and the d-axis and q-axis current reference values. It can also perform limit judgment on the total output current of the energy storage system. If the total current exceeds the limit, the current value of the controlled current source is adjusted accordingly. This method can be applied to simulation experiments of energy storage systems connected to large-scale new energy sources via flexible DC transmission systems.

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