HVDC Transmission Technology of Wind Power System with Multi-Phase PMSG

Abstract

The high voltage DC (HVDC) transmission technology of wind power system, with multi-phase permanent magnetic synchronous generator (PMSG) is proposed in this paper. Each set of three-phase winding of the multi-phase PMSG was connected to a diode rectifier. The output of the diode rectifier was connected by several parallel isolated DC–DC converters. Each DC–DC converter was connected to a sub-module (SM). All SMs and two inductors were connected in a series. The proposed wind power system has several advantages including, transformerless operation, low cost, low voltage stress, and high fault tolerance. The maximum power point tracking (MPPT) and energy balance of the DC–DC converters were achieved by controlling the duty cycles of the DC–DC converters. The HVDC transmission was achieved by the nearest level control (NLC) with voltage sorting. The simulation model with 18-phase PMSG was established. Experimental results were also studied based on RT-Lab.

A Wind Energy Conversion System Based on a Generator with Modulated Magnetic Flux

“…This PMSG uses a pair of three-phase windings in the stator, one of them connected in the "star" and the second in the "delta" configuration. So, the windings consist of two sets of three phase windings, which are spatially phase shifted by 30 electrical degrees and operate in a six-phase mode [19][20][21]. The multiphase machines, despite the higher costs of their manufacturing, compared to the three-phase machines, offer many more options for their use as converters of mechanical energy into electricity or vice versa [22,23].…”

Investigation on Dynamic Response of Grid-Tied VSC During Electromechanical Oscillations of Power Systems

“…The proportion of grid-tied voltage source converters (GVSCs) in the power grid has been expanding with the increases in renewable power generation capacity and voltage source converter-based high-voltage direct current [1,2]. On the one hand, GVSCs can rapidly adjust the power distribution by changing the reference values of the cascade control systems [3][4][5].…”