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Three-phase voltage-source inverters (VSI) have been widely applied for distributed generation (DG) systems. In this paper, a three-phase grid-connected inverter has been implemented using DSP-TMS320LF2407A microprocessor. The current controller strategy, namely hysteresis current control, has been employed as an inverter control strategy. Energy from small and medium scale wind turbines, fuel cells...
This paper proposes a simple technique to get maximum power of wind energy conversion system (WECS) without using sensors for wind and rotor speed of the permanent magnet synchronous generator (PMSG). It uses the measurements of DC current and DC voltage to obtain maximum power point tracking (MPPT) by controlling the duty cycle of the DC-DC boost converter switch. Moreover, a PI control is employed...
In a DC-based wind farm, only one DC-AC inverter can connect the whole wind farm to the AC grid. This relatively new wind farm topology is cost-effective since the number of three phase transformers and AC-DC converters can be reduced. In this study, the grid interfacing issue of small scale DC-based wind farm is presented where fuzzy logic controlled current controlled voltage source inverter (CC-VSI)...
A small scale wind energy conversion system has tremendous diversity of use and operating conditions, and consequently is evolving rapidly along with the large scale wind energy conversion system for generation of electricity in either stand-alone or grid connected applications. In recent years, the grid connected small wind turbine industry is primarily dominated by the Permanent Magnet Generator...
In drive systems the most used control structure is the cascade control with an inner torque, i.e. current and an outer speed control loop. The fairly small converter switching frequency in high power applications, e.g. wind turbines lead to modest speed control performance. An improvement bring the use of a current controller which takes into account the discrete states of the inverter, e.g. DTC...
This paper presents the application of average current mode control to reduce the THDi and increase the PF in a three-phase boost rectifier driving a small wind turbine. It is used as the input stage of small wind turbines with permanent magnet synchronous generators operating at variable speed.The boost rectifier output is connected to an inverter which injects the energy to a distribution power...
This paper presents the start up and operation of a stand-alone wind energy conversion system (WECS) using a squirrel cage induction machine (SCIM). The proposed scheme obviates the use of either excitation capacitor or batteries in DC bus. The DC bus comprising of a combination of normal electrolytic capacitor and few super capacitors, is interfaced with the SCIM through a current controlled inverter...
Awareness of power quality is highly increased in a sensitive industry, where the standardization and performance is an important aspect. The connection of wind turbine to the grid affectpsilas the electric grid power supply quality. Therefore it is necessary to maintain the power quality norm at the interface of the grid from the disruptive effect caused by wind turbine such as voltage fluctuation,...
In the wind energy conversion system, the wind turbine captures the wind energy. Then the generator changes it to the electrical power. So the characteristic of the wind turbine is very important. For some laboratories that donpsilat have the practical wind turbine, it is very convenience to use the wind turbine simulator instead of the real wind turbine. The paper introduces the structure and characteristic...
This paper will show the theory, simulation and application of maximum power point tracking for small scale wind turbines. The theoretical section of this paper will cover modelling of the wind turbine, the and the power electronic converters (the full-bridge DC/DC converter and the grid connected current controlled voltage source inverter (CCVSI)). It is shown that by controlling the duty ratio of...
In the grid new renewable resources are added to extract more power. This adds more of problems to grid connection. They are voltage fluctuations and harmonic distortion. In this paper various interfacing topologies are analyzed to get wind turbine power within the norms specified in IEC 61400-21. In this paper, a simplified control strategy is used. The front-end voltage source inverter is operated...
Permanent magnet synchronous generators (PMSG) applied to wind energy conversion system (WECS) using variable speed operation is being used more frequently in wind turbine application. Variable speed systems have several advantages over the traditional method of operating wind turbines, such as the reduction of mechanical stress and an increase in energy capture. To allow the variable speed operation...
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