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As a renewable, clean energy, wind energy has attract more and more attention. It has become a common understanding of the world to vigorously develop wind energy. In order to guarantee the safety and reliability for wind power integration operation, it is of great significance to establish an appropriate wind power generator system model and analyze its electromagnetic transient characteristics....
This paper deals with an electronic load controller (ELC) for a standalone induction generator (IG) used in small hydro power generation. The proposed ELC is used to control the voltage and frequency of IG. This ELC is realized using a non-isolated T-connected transformer and three-leg insulated gate bipolar transistors (IGBTs) based current controlled voltage source converter (VSC), a capacitor,...
Low Voltage Ride Through (LVRT) technology of Doubly Fed Wind-Power Induction Generator (DFIG) is a very important issue for grid-connection of wind power system. The paper analyzed and simulated dynamic response of DFIG under gird voltage dip. Aiming at this problem, the paper proposed a whole set of LVRT control strategies for DFIG and designed a control logic diagram for the above strategies. In...
Recent advancement in size and technology of wind energy conversion systems (WECSs) require sophisticated control systems to effectively optimize energy conversion and enhance grid integration. Doubly-fed induction generators (DFIG)-based WECS are the most promising and widely utilized technology. This study focuses on advanced controls development to identify and assess the critical loads and instabilities,...
With rapid development of wind power generation, large capacity wind farms are connected into the transmission system. Comparing with traditional power plant, the transient characteristics of transmission grid including wind farm are worthy investigating. The wind farm based-on wound rotor induction generators (WRIGs) shares high market occupancy in China, but academic researches on this grid-connected...
This paper describes the models of a wind power system, such as the turbine, generator, power electronics converters and controllers, with the aim to control the generation of wind power in order to maximize the generated power with the lowest possible impact in the grid voltage and frequency during normal operation and under the occurrence of faults. The presented work considers a wind power system...
A new modeling and control approach for DFIG-based wind generator is presented in this paper. To reduce the modeling complexity, the well-known ??T-form?? equivalent circuit of induction machine is replaced by the ??G-form?? circuit. Furthermore, the stator-voltage frame is used for the DFIG vector control, which avoids the need for accurate detection of the stator-flux vector position. A vector-based...
Compared with constant speed constant frequency wind turbine, variable speed constant frequency wind turbine has many advantages: higher efficiency of wind energy converting to electric power, absorbing gust energy, smoothly cutting into the network system, flexible connecting between wind turbine and network system and low operating noise. Currently the variable speed constant frequency technology...
This paper deals with an electronic load controller (ELC) for a stand alone pico hydro power generating system employing an isolated asynchronous generator (IAG). The proposed controller consists of an electronic load controller (ELC), using two leg IGBT (insulated gate bipolar junction transistor) based voltage source converter (VSC), a DC chopper and an auxiliary load at its DC bus. The neutral...
Details of control and instrumentation for on-grid and off-grid operation of a small induction generator based wind turbine are presented in this paper. A micro-controller based system controller is used to connect/disconnect the wind power generator to the grid, and also to maintain the grid connection. Several real time situations are considered during the operation of the wind power generation...
A hybrid system model is given for the power grid side converter based on hybrid system theory. This converter is part of the excitation source of the double-fed induction wind power generator. With space vector pulse width modulation method, we take the modulation of a space voltage vector in the third sector as a typical example; analyze the modulation process of the approximation of the three shared...
The dual stator winding structure (the power winding and compensating winding) is used to improve the dynamic performance of the induction generator. The constant output voltage of the power winding is kept through the input voltage regulation of the compensating winding. The dual stator induction generator system is controlled by a fuzzy controller for improving dynamic response. The modeling and...
Different aspects of reactive power regulation problem in wind farms are presented in this paper. In the first part some background of the reactive power control in wind parks is presented, including motivations for its use and methods that can be used. In general, there are active (wind generator, compensator) and passive methods (L,C) of reactive power compensation. A simulation model of the wind...
Self excited induction generator is extensively used in renewable energy sources such as small & large wind farms, small hydroelectric power plant and recently in micro combined heat and power systems muCHP. When connecting this unit to the grid a high transient current will flow. There will be a large, very fast, magnetic inrush current similar to that which occurs when a transformer is energised...
A grid connected power generation systems based on the superior controllers of an active and reactive power are useless during a grid failures like grid short-circuit or line braking. Therefore the change of operation mode from grid connection to stand alone allows for uninterruptible supply of a selected part of grid connected load. However, in the stand alone operation mode the superior controllers...
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