Reliability Assessment of Power System with Wind Farm
|School||Taiyuan University of Technology|
|Course||Proceedings of the|
|Keywords||Grid wind turbine Weibull distribution Reliability model Sequential Monte Carlo simulation method Reactive power compensation Steady-state analysis|
With the world's growing energy demand and renewable energy development and utilization of wind energy as a renewable clean energy more and more attention has been paid. Wind power generation technology is mature and relatively low cost of power generation to become the most important kind of alternative forms of conventional energy. Because wind energy is random and intermittent, large-scale wind power generation and network be a great impact on the safe and stable operation of the power system, especially the impact of power system reliability. This paper analyzes the characteristics of the wind power generation system, in-depth study of the impact of the wind farm reactive power compensation capacity of the power flow distribution. Wind farm power system reliability analysis model based on the uncertainty of the randomness of the wind power system operation status, were used to build wind farms sequential Monte Carlo simulation method based on steady-state analysis of power systems reliable analysis model, a comprehensive assessment of impact on the reliability of the power system. The main content of this paper and the results are as follows: (1) introduction to the basics of wind power grid, including the basic components of the wind turbine and the energy conversion process, the basic conditions for wind power grid and grid. Focuses on wind power grid-connected power system caused by voltage fluctuations and flicker, harmonic pollution and the impact of the voltage stability, and the corresponding improvement measures. (2) using sequential Monte Carlo simulation method to calculate the wind farm power system reliability. Fitting wind speed distribution Weibull probability distribution model based on the relationship between wind speed and wind turbine output power output of the wind turbine. Taking into account the random characteristics of the wind turbine output and forced outage rate uncertainties, the establishment of a wind farm reliability model, to combine conventional generator set the random outages model and load model, access to the wind farm in the EPRI-36 node system the system reliability assessment, application of sequential Monte Carlo method, and the impact of changes in the number of units of the wind turbine power system reliability impact of wind farms on power system reliability coefficients were calculated. The results show that the volatility and uncertainty of wind speed wind farm power supply reliability is relatively low, but the reliability of the entire power grid or contribution. Considered from the perspective of power system reliability and economic assessment, with appropriate input from the wind turbine for a certain number of units can effectively improve the level of reliability of the power system. (3) for the wind farm in the active power delivered to the system from the grid absorption characteristics of the reactive power excitation computing model of the wind turbines in the steady-state analysis and reactive power compensation model to calculate a wind farm in the different nodes connected to the grid after changing reactive power compensation capacity of each node of the grid voltage. The results show that, with the increase in the capacity of the wind farm reactive power compensation, the voltage level of the entire power system has improved, but the wind farm near each node voltage, far away from the wind farm node voltage slow growth. (4) taking into account based on the sequential Monte Carlo simulation of the wind farm power system reliability calculation before and may appear in the actual operation of the transmission power overload and node voltage more limited, which makes the method in practical applications has certain limitations. Based on wind farm power system steady-state analysis, calculation of wind farms different node access system and reactive power compensation capacity of power system reliability. The results show that the reliability of the power system wind farm reactive power compensation capacity increase and improve the reliability of the electricity system, the location of the wind farm access point a great influence. So in the wind farm planning reasonable location.