Application of a BDDC Bidirectional Brushless DC Drive on a Pump Hydro Energy Storage System
摘要
Pump hydro energy storage (PHES) is ideal for solar, wind, etc. Brushless DC (BLDC) machine will boost PHES system efficiency. In this study, a bidirectional DC–DC converter (BDDC) interfaces the DC bus and the bidirectional BLDC (BBLDC) machine. BDDC can supply DC bus power to the BLDC motor to pump water to the upper reservoir. It also supplies electricity from the stored potential energy of water through the BLDC generator to DC bus, which feeds the DC load. A BDDC avoids the inverter’s complex control algorithm (VSI). A BDDC and BBLDC drive provides adequate charging and discharging for PHES system. A simple PI controllers maintain the DC bus and rotor speed. A comparison of system performance with and without maximum power point tracking (MPPT) is analysed in this paper. The system performance on steady and dynamic state was analysed. The proposed system is simulated in MATLAB/Simulink, and results are shown.