Renewable Energy and Energy Storage

Power supplies and batteries

Combining hardware and software approaches to reduce common mode voltage for long lasting motor in vacuum; compact common mode filter based exclusively on capacitors; 10% of motor power increase by proper PF regulation; introduction of unsynchronized mode for low speed operation- FW discharge to zero speed; test of electronics in a specialized lab for compliance with industry standards; modeling losses of 20MW frequency regulation plant including FW and motor, electronics, transformers, and auxiliary loads; safe shut down of FWs by setting up a local grid in case of grid failure; design of 160kW bidirectional AC-to-AC converter; “field weakening” of PM motor; P-Q decoupling, four quadrant apparent power;dead time compensation, LCL filter; voltage feed-forwarding for reduced imbalance and harmonic mitigation; system stability, damp circuits; current suppression for non-critical faults; algorithms for FW in microgrid based on PREPA; algorithms for limiting real power command and rate of its execution, motor current limiting; armature reaction of synchronous machine; forced air, liquid cooling, and two-phase (Parker) cooling; PF correction, “field weakening”, CM voltage filter, LCL filter; MatLAB simulation; OrCAD Capture; IGBT life expectancy, reliability per MIL-HDBK-217F.

Power Electronics for wind, hardware and software design. Battery charging application: dc-to-dc wind converter, peak power tracking, slow mode, blown fuse mode. Grid-tie application: reconfigurable under load single-phase inverter, three-phase wind inverter based on ACS600. PIC and dsPIC, KiCAD, customer support, automated test procedure.