Active and Reactive Power Coupling Characteristics Based Inertial and Primary Frequency Control Strategy of Battery Energy Storage Station

摘要

With the increasing of large-scale grid-connected wind power, solar energy and high voltage direct current transmission (HVDC), the power supply structure of power systems has undergone tremendous changes, which leading to the insufficient of rapid frequency modulation capability of the power supply. On the other hand, the poor voltage regulation characteristics of capacitor-based reactive power compensation equipment and the lack of dynamic reactive power support capability are a huge challenge for the power grid. As an important way of energy storage, battery energy storage (BES) has the advantages of flexible power and energy allocation according to the needs of different applications. By optimizing the dynamic characteristics of the BES power station, it can effectively assist the power grid in rapid frequency modulation and voltage regulation. In this paper, an additional frequency control strategy is proposed for the coupling characteristics of active and reactive power in power systems. By controlling the voltage, the BES power station can still participate in the inertial response and primary frequency modulation of the grid under the condition of low state-of-charge (SOC), which improves the regulation ability and the flexibility of operation of the grid. the results of simulation analysis on Matlab/Simulink verify the effectiveness of theoretical analysis.