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In this paper, a new control strategy is proposed to improve the performance of a wind generator system composed of a three-phase PMSG and a Back-to-Back three-phase to single phase converter. With the use of the large inductance of the synchronous generator, the control method minimizes the generator torque ripple when the system supplies a single-phase load. The problem arises from the fact that...
With the introduction of new guidelines regarding the connection of large wind farms to the grid, wind farms and equipment providers are facing with new opportunities and challenges. One of which is low voltage ride-through (LVRT). Despite of the new installations, there are a considerable number of wind turbines to be reformed to meet the requirements. In this paper, a brief explanation of the principle...
Wind generation rapid development has brought challenge to the grid. Reactive voltage is the most outstanding and one of the most concerned problems. This paper introduces the concept of wind farms reactive power compensation and wind power grid code with respect to reactive power regulation all over the world, gives the simplified approach to estimate reactive power compensation capacity, and validates...
An accurate model of large scale wind farm is demanded for researches about the impacts on the power grid. The total number of wind energy generators is so large that the detailed model of wind farm is computationally prohibitive. Dynamic equivalence can significantly reduce system order with the major characteristics retained. So the aggregation of large scale wind farm is inevitable. An overview...
The traditional control strategies of the permanent magnet synchronous generator (PMSG) based on rotor flux orientation have unconquerable drawbacks, such as the reactive power exchange by the id=0 control and the complicated calculation by the unity power factor (UPF) control. A novel UPF control strategy of the PMSG using stator flux orientation is proposed in this paper. The simulation results...
This paper researched the necessity and feasibility for installing dynamic reactive power compensation device STATCOM in wind energy collection substation with the aim of illuminating the validity of the compensator and selecting of the compensation devices with the integration of the large scale wind farms. According to simulation results, this paper checking its function for improving electrical...
Wind generation has been the fastest growing power source over the past decade and this growth is forecasted to continue. Grid code requirements on wind power plant are becoming more stringent as the wind power penetration level increases. In order to identify the risk of incompliant with grid code requirements at the planning stage of a wind power plant project, a standard grid code study process...
This paper presents an improved Newton Raphson load flow algorithm considering distributed generation (DG) based on their control strategies. Different control strategies for various DGs are firstly investigated and the load flow model for direct-driven wind generator is especially mentioned. Then, each kind of DGs, including photovoltaic, wind turbine, fuel cell and microturbine, is assigned a bus...
This paper presents the relevant aspects related to large scale integration of wind power into the power system. Grid integration of WPPs is a technical and economic ability of WPPs to connect and operate within the electric power supply network in a manner which is compatible with the day-to-day operation and short-term security of the electric supply as a whole. WPPs when connected to a weak grid...
This paper studied mathematical model of doubly-fed induction generator (DFIG) based wind turbine generation system under unbalanced voltage. A dual-PI current control strategy was proposed to improve the performance of DFIG's rotor side convert (RSC) under asymmetrical voltage condition. The symmetrical component theory is employed to decompose asymmetrical three-phase variable such as voltage and...
The sensitivity of the DFIG to the grid disturbances such as a voltage dip restricts network stability and risks damage to generator converters during the fault period due to the over-current and/or over-voltage. It is now a requirement that wind turbine manufacturers demonstrate what is commonly called `Fault Ride Though' (FRT) capability in their turbine systems. The rotor crowbar, as a cost-effective...
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