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A novel five-level (5L) full-scale converter is proposed for large direct-drive wind turbines. In this scheme, a 5L-Vienna rectifier is used as a robust generator-side converter and a 5L neutral-point-clamped inverter as a grid-side converter, a flying-capacitor auxiliary bridge leg is proposed to maintain the voltage balance of the dc capacitors. This study first discusses the neutral-point balancing...
Considering wind farms real operation characteristics, a novel method using sensitivity analysis and Tabu algorithm for reactive power compensation allocations is proposed. In this paper, the sensitivity coefficient is defined as partial derivative of voltage/reactive power. The nodes that have higher sensitivity coefficient are selected for install capacitors or SVC to reduce the voltage to the largest...
Considering the dynamic characteristic of wind farms, especially the wind turbines' output fluctuate with wind speed, the optimal reactive power compensation problem for wind farms is formulated and solved by genetic/tabu search hybrid algorithm (GATS). A mathematical model of reactive power compensation, focused on voltage stability and power losses of wind farms, is developed, and the reactive power...
Electromagnetic coupling disturbances have to be given enough attention in the design of hybrid integrated power electronic module (IPEM) due to the sharply decreased distance between power devices and the control/driving circuits comparing with conventional power electronic equipment built with discrete devices. The high di/dt or high frequency parasitic current ringing is one of important disturbance...
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