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Static var compensator (SVC) and thyristor controlled series compensator (TCSC) are used to improve Transient Voltage Stability of the asynchronous wind farm in this paper. The related structure model of the wind farm power system is built in Matlab / Simulink. The contributions of SVC and TCSC to Transient Voltage Stability of the asynchronous wind farm and power grid are verified by the simulation...
Wind turbine power output is totally intermittent in the nature. For grid connected wind turbine generators, power system operators (transmission system operators) need reliable and robust wind power forecasting system. Rapid changes in the wind generation relative to the load require proper energy management system to maintain the power system stability and of course to balance the power generation,...
Recently wind energy has developed at a fast pace, and it is necessary to develop equivalent models to represent dynamic behaviors of wind farms on power system. This paper investigates the applications of the equivalent wind method for the aggregation of DFIG wind turbines. Simulations in a practical power system have been used to verify the effectiveness of the aggregation.
DG based on wind energy system (WES) has the probabilistic output power relied on natural conditions, the traditional deterministic load flow is not a suitable tool for the analyzing and maintaining distribution system. Aiming at this problem, this paper applies a probabilistic power flow (PLF) method to evaluate the influence of distributed generation with WES. Firstly, the probabilistic model of...
A 2 DOF model with the coupling of vertical and torsional motions is considered to study galloping of bundle conductors in this paper. By using the averaging method and the Routh-Hurwitz criteria, the motion equations are solved to discuss the stability of the trivial solution and find the influence of system parameters such as ice thickness, initial tension, vertical damping ratio and mass of unit...
A maximum power point tracking (MPPT) controller for variable speed wind energy conversion system (WECS) is proposed. The proposed method, without requiring the knowledge of air density, wind speed and turbine parameters, generates at its output the optimum speed command for speed control loop of rotor flux oriented vector controlled grid side inverter control system using only the instantaneous active...
Pollution flashover accident of insulators may threaten the safety and stability of power system; however, there lacks an effective way to evaluate this potential risk, because the rule of contaminant deposition is still not fairly known. Artificial contamination tests are carried out to study the contamination deposition characteristics which may give help to evaluate the flashover probability. The...
Support vector regression (SVR) is a common learning method for machines which is developed these years. Comparing with the other regression models, this method has the advantages of structural risk minimization and strong generalization ability. It is widely used in the prediction field and acquires good effects. The training characters of SVR model are very important to SVR. To solve the problem,...
The paper establishes a calculation model for aerodynamic parameters and performance for horizontal shaft wind turbine according to strip theory, in the design, the strip theoretical is revised by considering the parameters included the blade tip loss, blade root loss, cascade influence and heavy load operation. Blade aerodynamic shape of 1.5MW horizontal shaft wind turbine is finished, and aerodynamic...
This paper adopts four estimation methods of Weibull distribution parameters for the data processing of the wind speed. The Weibull model is firstly introduced. Then the four parameter estimation methods are analyzed. Finally, the four methods are respectively used to estimate the scale parameter C and the shape parameter K of the Weibull distribution. The results show that these four methods are...
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...
MW wind turbine blades usually are destroyed by the aerodynamic load. However, measure the aerodynamic load is always difficult. The outside in-truck test method is used for the 100W wind generator sets experiments in power characteristics on the 1MW and 2MW blade models combined the design parameter and the aerodynamic parameters, the experiment results were analyzed. Meanwhile, the aerodynamic load...
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...
Tubular tower is widely used as high-load tower for transmission line. Some circular-section members tend to present vortex-shedding induced across-wind vibration under low wind speed. This is supposed to be treated properly in structural design to well handle conflict between structural safety and economy. In the paper, based on theoretical analysis on vortex-shedding induced vibration in conjunction...
Model of wind turbine system contains lots of different components and most of them have reaction to each other. This character makes the software model describing of wind turbine system become difficult. There is also another problem is that even if we modeling this system in software, its stiff system character made the real-time simulation become difficult. This paper proposes a kind of half-physical...
SRG is a complex nonlinear dynamic motor. Conventional methods can't build it model accurately; bring the controls a great deal of inconvenience. In this paper, 8/6 switched reluctance generator will be mentioned; Application of Fuzzy Logic Controller (FLC) is studied in this paper to control the DC-link voltage of Switched Reluctance Generator (SRG) wind power generation system. The design of fuzzy...
This paper presents a feasibility study of photovoltaic (PV), wind, biomass and battery storage based hybrid renewable energy (HRE) system providing electricity to residential area in Australia. The system with load of 200 kWh · day-1 is analyzed through the environmental and economic aspects. The study computes the net present cost (NPC, $), cost of energy (COE, $ · KWh-1) and the emissions (kg ·...
Wind power is a significant alternate energy in times of energy crisis. In virtue of its intermittency and fluctuation, it poses several operational challenges to grid interfaced wind energy systems. This paper introduced autoregressive integrated moving average (ARIMA) model and artificial neural network (ANN) to forecast the hourly wind speed one to four hours ahead. The models are applied to wind...
This paper has studied a control strategy and algorithm to ensure the wind turbine to work in the optimal state when the wind speed is low. Taking into account the overshoot of output power and the power consumption of the wind turbine itself, a simple and effective realization of the load control algorithm has been designed. Simulation results on MATLAB show that the designed algorithm could guarantee...
The blade aerodynamic performance of the NREL Phase VI rotor is studied using the full three dimensional Navier-Stokes equations and the κ-ω SST turbulence model under non-yawed condition at the wind speeds of 7m/s and 10m/s. Comparisons with NREL Phase VI experimental results are presented with respect to the pressure distributions, the normal force coefficients and the tangent force coefficients...
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