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The direct-drive wind power generation system based on permanent magnet DC motor is researched, and the converter models of generator side and power network side is analyzed in detail. The system consists of a permanent magnet DC motor- generator set, a rectifier of high power factor, a boost converter and a full power inverter. The practical wind speed is simulated by the change of motor speed which...
The generation of electricity based in the renewable energy sources has becoming a more significant in the last years because of continues increase on energy demand and fossil oil energy dependence, additional to preoccupation of environmental. Wind and PV power systems to generate electricity in The Republic of Cape Verde are analyzed in this paper. The power electronics converters and electrical...
This paper presents the behaviour of a hybrid system based on renewable sources (wind and solar) with their stochastic behaviour and a pre-programmed timed load profile. The goal is the analysis of a small hybrid system in the context of new services that can be offered to the grids as a power generator. Both the sources have continuous maximum power extraction where the Maximum Power Point Tracking...
In view of its variable nature, integrating large amounts of wind into a power grid generally aggravates the residual demand ramping requirements and stresses the generation ramping capabilities. Load following is the major area of impact when it comes to daily operation. The required load following service is addressed in two stages; day-ahead and intraday markets. This paper focuses on the day-ahead...
A wind farm usually consists of a large number of wind turbine generators (WTGs) connected through an internal electrical network and operating simultaneously. In order to study the impact of a wind farm on the dynamics of the power system, a major issue is to develop adequate equivalent models that allow characterizing the dynamics of all individual WTGs. In this sense, with the advance of power...
A real wind power generation system is given in this paper. SVM control strategy and vector control is applied for generator side converter and doubly fed induction generator respectively. First the mathematical models of the wind turbine rotor, drive train, generator side converter are described. Then the control strategy of generator side converter system is given in detail. Finally the simulation...
By replacing conventional mechanical bearing of wind power generator with magnetic bearing, the friction loss can be reduced obviously and the efficiency of power generation can be improved. Bearing capacity of radial magnetic bearing (RMB) is determined through analyzing the radial loads of wind power generator, and upon this, the structure of radial magnetic bearing is designed. Then the electromagnetic...
As Availability of coal is decreasing day by day and the load demand is increasing very rapidly, the demand for setting new coal based conventional power plants have gone down. The other factors like availability of appropriate land, cost per MW generation, raw material availability, Pollution issues, etc are other constraints for developing new coal based plants. The present world wind power scenario...
An overview of existing power loss reduction calculation methods, varying in complexity and accuracy, is undertaken. Their strengths and weaknesses are compared. Additionally, an improvement is suggested as the negative correlation between wind generation and system load is underscored. A case study is performed to determine the performance of the suggested improvement. Results showed that considering...
System security in the generation market is one of the important aspects in power system operation under deregulated environment. It becomes more crucial when thermal power system is integrated with wind system. This paper presents an approach to determine the security constrained unit commitment (SCUC) for thermal units integrated with wind power system. A Lagrangian relaxation based algorithm with...
Large scale wind power integration is the main way of wind power development in China. In simulation research, a large scale wind farm is necessary equivalent to be one aggregated model. The existing equivalence methods only consider the external characteristics of wind farm, and ignored the coupling relationship between units and power system. Through a massive simulation at different wind power...
Wind power is one of the common distributed generation in microgrid. According to the requirements of microgrid, permanent magnet synchronous wind generator (PMSWG) for wind energy distributed generation was designed in this paper and it has simple structure, easy control and low cost characteristics, non-controllable rectifier and grid-connected PWM convertor is adopted as the AC grid-connected circuit...
This paper presents a novel integrated stability controller for grid connecting variable-speed variable-pitch wind generator which regards the wind power system stability improvement and negative effect of stability control on wind generator reduction by wind generator power and pitch regulation. According to the full-state or non full-state nonlinear feedback strategy, the controller, which would...
With the advent of an era of the high fossil energy cost and growing environment consciousness, wind power is gaining great favor over other traditional energy sources. Large scale usage of wind energy can significantly reduce the pollutions and carbon emission otherwise caused by fossil fuel. In many cases, with tax incentive, investment in wind energy can also reduce the operational cost of generating...
This paper investigates the frequency control scheme of a doubly fed induction generator (DFIG)-based wind farms to provide frequency support for the power system steady operation. Due to the decoupling of the rotor speed and the grid frequency by the connected converters, the DFIG-based wind farm rarely contributes to the network effective inertia. This is particularly true in the small isolated...
As one of the renewable and clean energy resources, wind power is attracting considerable attentions and becoming most developing renewable energy resources due to its large unit capacity, etc. This paper make an basic approach to the construction of offshore wind farm power generation system, which is considered to be a promising way to increase the practical utilization of wind power. In this paper,...
Wind power generation develops very fast in every country as a kind of important regenerative energy. The modeling of wind farm is the foundation of controlling and optimizing it. This paper introduced in detail the mathematics model at present and modeling methods in this field. What's more, it also outlined the factors what should be considered during the modeling process. At last the trend of wind...
This paper deals with investigation on the performance of voltage and frequency controller (VFC) of a wind power generation using a capacitor excited isolated asynchronous generator (IAG) feeding dynamic loads. The amplitude of load currents is estimated using the low pass filter to control the voltage and frequency of IAG system. Three-leg voltage source converter (VSC) with a battery energy storage...
This paper presents a quantitative analysis of the advantages of a grid connected doubly fed induction generator (DFIG) for wind energy conversion systems (WECS) over the other available variable speed WECS. The WEC system includes back-to-back connected PWM voltage source converters (VSC) in the rotor circuit of the DFIG. The control strategy implemented is - unity power factor operation of the machine...
Battery energy storage system (BESS) is to be incorporated in a wind farm to achieve constant power dispatch. The design of the BESS is based on the forecasted wind speed, and the technique assumes the distribution of the error between the forecasted and actual wind speeds is Gaussian. It is then shown that although the error between the predicted and actual wind powers can be evaluated, it is non-Gaussian...
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