Integration of Multi-Function BESS Based on Coordination Strategy to Simultaneously Support Multiple Ancillary Services

The intermittent nature of renewable energy sources (RES) can be mitigated by Battery Energy Storage Systems (BESS) providing ancillary services. However, the high cost of BESS remains a significant barrier to its utilization. This paper proposes a solution by utilizing BESS to provide multiple ancillary services simultaneously, maximizing their value and efficiency. Several control loops are implemented for frequency response, voltage support, and wind power smoothing. Moreover, a novel coordination strategy is proposed based on a dynamic PQ chart for the grid-side inverter. This strategy coordinates voltage and frequency outer regulation loops, optimizing the active and reactive power support with consideration of inverter power limits and State of Charge (SoC), allowing for the simultaneous provision of multiple ancillary services. The proposed system's functionality and capability to provide the required support are validated through MATLAB simulations, demonstrating the effectiveness of the coordination strategy in mitigating the effects of generation intermittency and load variation and enhancing renewable energy (RE) integration.