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This paper proposes a hybrid ac/dc micro grid to reduce the processes of multiple dc-ac-dc or ac-dc-ac conversions in an individual ac or dc grid. The hybrid grid consists of both ac and dc networks connected together by multi-bidirectional converters. AC sources and loads are connected to the ac network whereas dc sources and loads are tied to the dc network. Energy storage systems can be connected...
The stochastic fluctuating offer of wind energy limits the capacity of supply in electrical grids by means of technical and economical reasons. To increase the supply, a concept of dynamic conditioning with the objective to increase the quality of supply was developed. The concept envisages support and management of the electrical grid respectively through compensation of active and reactive power...
The efficiency of the wind power conversions systems can be greatly improved using an appropriate control algorithm. In this work, a robust control for variable speed wind power generation that incorporates a doubly feed induction generator is described. In the presented design it is applied the so called vector control theory. The proposed control scheme uses stator flux-oriented control for the...
Accurate and fast detection for phase angle of the generated voltage is important in parallel grid- connected wind energy conversion systems (WECSs) utilizing converter-inverter unites. Software Phase Locked Loop (SPLL) technique is presented here for precisely detecting the phase angle during presence of the 5th and 7th harmonics. A second-order loop filter design is proposed here as a good trade-off...
This paper presents analysis, design, and simulation for vector oriented control of three-phase voltage source pulse-width modulation (PWM) inverter which aims to optimize the utilization of wind power injected into the grid. To realize this goal, a digitally controlled converter-inverter system is proposed which provides economic utilization of the wind generator by insuring unity power factor operation...
This paper presents a performance analysis of wind-powered self-excited induction generator (SEIG) and a vector-controlled pulse-width modulation (PWM) converter. Three-phase voltage-source converters are the building blocks of a great number of power electronic systems. The origin of difficulties in the control of the above converters is in their nonlinear nature. The PWM current control technique...
This paper presents a wind electric conversion system composed of: permanent magnet synchronous generator, three-phase diode rectifier, DC/DC buck converter, PWM voltage inverter and transformer feeding a network. The PWM voltage inverter current controllers impose that the mains currents will have near sinusoidal waveforms with unity power factor, leading to a high quality power delivered to the...
In the doubly-fed wind generator system, a bi-directional converter is needed to control the energy bi-directional flow due to the different operation of generator. Doubly-fed PWM converter with attractive characteristics, such as well sinusoidal waveform of input current, high power factor, low THD (total harmonic distortion) to the grid and motor, and bi-directional conversion, could better meet...
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