Abstract
In order to improve the asymmetric fault ride-through capability of wind power generation system, asymmetric voltage and current can be decomposed into positive sequence, negative sequence and zero sequence components respectively via symmetrical component method. The mathematical models of grid side converter in static coordinate system and synchronous rotating coordinate system were given; predictive current control strategy proposed can achieve no static error tracking of current in each switching cycle, can eliminate the negative sequence current in asymmetric fault and wipe off the secondary ripple of the dc side capacitor voltage. The dc side super-capacitor circuit can prevent the dc side from over-voltage. The methods introduced in this study can improve the large grid asymmetric fault ride through capability of wind power generation system. Effectiveness of the proposed methods is verified by the numerical simulations.
Highlights
Wind power generation is considered to be one of the fastest growing renewable energy sources
Some countries have already issued the grid codes of wind power generation system connecting with the grid (Iov et al, 2007; Saniter and Janning, 2008)
The wind power generation system consists of a synchronous generator connected to a diode rectifier, a DC-DC IGBT-based PWM boost converter and a DC/AC IGBT-based PWM converter
Summary
Wind power generation is considered to be one of the fastest growing renewable energy sources. Grid codes require that wind power generation system to have certain low voltage ride through capability. The low voltage ride through requirements that wind power generation system should keep connected to the grid during its voltage sags are shown in Fig. 1 (Iov et al, 2007).
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