Integrated Battery Energy Storage and STATCOM for the Optimal Operation and Control of WPP in Power System

The project aims to develop multi-MW integrated power electronic system with the battery energy storage system (BESS) incorporated into the modular multilevel converter (MMC) topology for high voltage systems at the transmission level, as shown in Fig. 1 (in Appendix A). Such a system can provide the three major control capabilities to achieve different functionalities for the efficient control and operation of wind power plant (WPP):
1. Dynamic active power regulation (for different functionalities like frequency regulation, inertial response, power oscillation damping, black-start, etc.) 2. Dynamic reactive power and voltage control 3. Active harmonic filtering (harmonic compensation and resonance damping). Control and operation of such a device will be investigated, and its performance (with respect to the different functional services) evaluated through real-time as well as offline simulation models. A detailed study of the device will be carried out to characterize it in terms of its structural components and their ratings as well functional behavior under different operating and stress conditions. Thus, the proposed device is based on existing individual devices, which will be scaled up for application at the transmission system levels. Modularity and scalability will be very critical for such applications. At the same time, the control system should provide stability and robustness. Their integration and development of a unified control strategy is the key innovation which is expected to provide better utilization of the equipment and hence a reduction in the operational cost. Since it is an altogether new integrated device, it will take at least a few years before it gets commercial acceptance from the industry and the power grid operators. It will be implemented in field demonstration to reach TRL6 in another project in near future.