Encompassing nine switch converter approach in wind-hydro hybrid power system feeding three phase three wire dynamic loads

•Incorporating nine switch converter in a hybrid power system integrating battery and ultra-capacitor for dynamic load conditions.•The proposed converter operates in bidirectional mode to maintain the magnitude of the load voltage and frequency to be constant.•With the traditional voltage source inverters, integration of additional energy sources and storage elements was not possible.•The proposed system shows notable performance during sudden increase in load demands and makes the bidirectional nine switch converter a paramount structure.

This paper proposes a novel nine switch converter based isolated wind hydro hybrid power system feeding three phase three wire dynamic loads. The proposed system comprises of three generating units and two storage units. In this work, hydro and wind turbine generation system is deployed through squirrel cage induction generator (SCIG) with 50 kW and 40 kW respectively. The main impact of this work is the integration of additional PV unit and two storage units namely battery and ultra-capacitor (UC) into the system through the proposed nine switch converter which was unfeasible through the conventional voltage source inverter. This proposed converter operates in bidirectional mode as either converter or inverter which overcomes the limitation of utilizing additional bidirectional converters. By this novel approach, power can be effectively stored and retrieved from the storage devices through the converter based on the load demand. Sudden increase in load and evaluation under minimal renewable energy support was also studied to evaluate the significance of the proposed system and results are obtained to prove the successful working of the proposed scheme.