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This work presents concept and implementation of a bidirectional coupling between direct-current circuits of significantly different voltage levels using galvanic isolation in the form of a high-frequency transformer. Standard 5-kW/100-kHz compact dual active bridge modules were used for construction of the coupling. Possibilities of modular construction of the system were presented, in which both...
Variable pump driving variable motor (VPDVM) is an essentially nonlinear system with dual-input single-output and coupling. Regular control algorithms are difficult to achieve approving control effects on this kind of system. In this paper, the sliding mode genetic control algorithm is proposed for VPDVM. The algorithm mainly aims at solving problems of nonlinearity and unable-decoupling of VPDVM...
Brushless Doubly-Fed Induction Generator (BDFIG) is potential for power generation applications for its high reliability and low maintenance-cost. There are two operation modes for BDFIG: grid-tied and stand-alone modes. The grid-tied mode usually uses the power winding (PW) synchronous and orientation frame since PW is connected to the grid; however in stand-alone mode, the PW is connected to the...
Brushless doubly fed induction generator (BDFIG) eliminates the slip rings and brush gear and thus having the benefit of high reliability and low maintenance costs, which shows commercial promise for either grid-connected or standalone power generation. This paper proposes a new field-oriented control method for a BDFIG in stand-alone application. The proposed control system is oriented with the control...
This paper presents a Fuzzy Logic Controller (FLC) for a MIMO nonlinear turbo generator system. Different parts of synchronous turbo generator (STG) have physical effects on each others and FLC is used to solve complexities of MIMO systems such as high dimensionality, nonlinearity and coupling. Using this controller , makes the voltage and frequency of turbo generator quickly and accurately reach...
This paper proposes a voltage- and frequency-control strategy for the islanded operation of dispatchable electronically coupled distributed-resource units, based on a discrete-time mathematical model which is also valid for variable-frequency operation. The proposed control strategy utilizes a combination of deadbeat and repetitive control to enhance the performance of the control system under unbalanced...
This paper presents a modified direct power control (DPC) strategy for a doubly fed induction generator (DFIG) based wind power generation system under unbalanced grid-voltage conditions. The strategy is based on the investigation of the mathematic model and the composition of the instantaneous active and reactive power outputted by DFIG. It is found that, by applying a notch filter of two times of...
This paper presents an improved stator flux orientated (SFO) control strategy of induction motors. Based on coordinate transformation and stator flux orientation, a mathematical model of induction motor is derived. In this new system, the stator flux linkage is directly controlled by the d-axis component of stator voltage and in the speed control channel, the output of current controller is regarded...
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