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This paper describes the configuration and control methods of wind power not connected to AC grid, but directly to DC loads in large wind farms. In order to balance the power in the bus, energy-storage units are introduced. When DC power does not balance in DC bus, voltage spikes and voltage level rising will appear in the DC bus, which are destructive to the electronic devices. The methods of restricting...
A dynamic model of back-to-back voltage source converter under synchronous rotating d-q coordinate system is developed. The system is transformed to a new equivalent nonlinear system which consists of a linear decoupled subsystem and a nonlinear subsystem characterizing the dynamics of the DC-link voltage in terms of the state variables in the linear subsystem via the feedback linearization technique...
In this paper, a digital and analog hybrid control of multiphase power-modules with low output-voltage and high output-current are presented. The topology of each power module is a current-fed push-pull converter. The front stage is a buck converter which is used to regulate the output voltage and the rear stage is a push-pull converter with the electrical isolation and voltage step-down function...
Single phase neutral point clamped (NPC) converters are increasingly applied in high speed railway traction drive systems as they allow the use of lower voltage devices in higher voltage applications, provide reduced output voltage THD and can develop low common mode voltage. To solve the imbalance problem of neutral point voltage, dead-time effect for neutral point voltage is described in this paper...
Instantaneous values of input line-to-line voltages control method is one of the important control strategies for matrix converter. By using this control method the compensation of the asymmetrical input source voltages is easily achieved. However, many researchers focus on pursing a new control strategy for this method due to the complexity of the previous control strategy and difficulty of its realization...
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