Power System Stability And Power Quality Detection Tectnology Including Wind Power

Wind energy is an important renewable energy resource,and environmental protection is crucial for energy security.Wind energy is converted to electrical energy,smooth and non-blocking transport of high-quality power to the user,it has become one of the core energy revolutions.Compared with other traditional power generation,wind power contains many uncertainties,its large-scale grid connection and brought serious challenges,the uncertainty of wind power has an impact on power system stability and power quality,therefore,studying wind power grid connection,the stability and the impact on power system transient generated power quality is particularly necessary and urgent,reasonable great significance for promoting wind power.The main content of this paper includes the following aspects:(1)the traditional power system generator,the electricity network and load models are discussed,in order to machine infinite bus system and the western US grid WSCC three machines nine bus system,transient stability analysis model and numerical model of a simple power system solution,and summarizes the power system transient stability model for solving simple processes.Transient stability simulation last,respectively,in single and three-machine infinite bus system nine carried out to solve the transient stability simulation experiments corresponding failure while maintaining a stable fault critical clearing time.(2)analysis of characteristics of wind power fluctuations in wind speed,wind speed build stochastic models.For the current common fan features,to create different types of turbine meters and wind velocity fluctuations in the grid model.Will take into account the uncertainty of the model turbine to the grid,the establishment of power system dynamic model of wind power meter and differential equations based on the theory of stochastic uncertainty.With the theory of stochastic differential equations and numerical integration methods,and will be applied to power system stochastic model to analyze the uncertainty of wind power on power system electromechanical transient process.Combining simulation example,wind power analyzer and uncertainties random random static stability and transient stability,the uncertainty of wind power system transient stability will deteriorate to some extent,and it will cause long-term can not eliminate the low-frequency oscillation of power stability of the system lead to continued problems.Consider adding damping system can decrease the negative effects of wind power uncertainty.(3)proposed algorithm based on improved power quality LMD disturbance detection method,the algorithm can be non-linear power quality disturbance signal by the local frequency of high and low adaptive PF is divided into several components,each layer PF bythe envelope signal and pure FM signal two parts,by the adaptive decomposition of the amplitude envelope signal and pure FM signal can be taken out seeking instantaneous amplitude function and the corresponding PF function of frequency components,thereby obtaining power quality disturbance amplitude and frequency of the information signal.Common single disturbance signals and mixed disturbance signal model simulation results demonstrate the effectiveness and feasibility of the method;transient voltage of a power quality data including wind power substation and a 500 KV substation capacitor switching when measured disturbance data analysis results further demonstrate the effectiveness of this method.