IJERT-An Advanced Full-Bridge Three Level DC-DC Converter with Voltage Balancing Control Technique for Wind Power Systems (original) (raw)

2014, International Journal of Engineering Research and Technology (IJERT)

https://www.ijert.org/an-advanced-full-bridge-three-level-dc-dc-converter-with-voltage-balancing-control-technique-for-wind-power-systems https://www.ijert.org/research/an-advanced-full-bridge-three-level-dc-dc-converter-with-voltage-balancing-control-technique-for-wind-power-systems-IJERTV3IS080933.pdf This paper presents an advanced full-bridge three level DC-DC converter and its control for wind power systems. A passive filter is used to improve the performance of the proposed converter. The presence of passive filter reduces the voltage stress of the medium frequency transformer in the AFBTL DC-DC converter. A modulation strategy is proposed for the AFBTC DC-DC converter, which provides two operating modes. Furthermore, a voltage balancing control of the wind turbine based on the AFBTL DC-DC converter in a DC-grid system is presented. Finally, the simulation results for the proposed AFBTL DC-DC converter with 1KW output power range is presented and obtained merely to the theoretical values. Keywords-Full bridge three level (FBTL) converter, half bridge three level (HBTL) converter, permanent magnet synchronous generator (PMSG), DC-DC converter, wind turbine, voltage balancing control, pulse width modulation (PWM). I INTRODUCTION In general, the DC grid provides advantageous things such as absence of reactive power, harmonics and power factor, which gives an effective solution for the power collection system for the growing power demand in the present days. The offshore wind turbines are mostly connected to a DC grid to deliver DC power to a medium or high DC voltage networks. To minimize power delivery and the DC connection, a high efficient DC-DC converter is required. Generally, the voltage level of the DC network is much higher than the input voltage level of the DC-DC converter. For this reason, a medium frequency transformer (MFT) with a range of hundreds of hertz to several kilohertz operating frequency is used for the DC-DC converter. In addition to providing the boosted output voltage, it provides the galvanic isolation between source and grid. (1a) (1b) Girija, P.