Research Of Chaotic Dynamics Behavior In Wind Power System

With the rapid development of wind power generation, the wind power becomes one of important resources to replace the traditional non-renewable energy. But as the wind power generation capacity and grid scale continues to expand, the nonlinear of the grid is becoming more and more strong, making chaos oscillation problem more and more worsen. So the chaos phenomenon caused by internal parameter changes and external disturbance of Wind power system are studied in this paper applying chaos theory. The paper’s main contents and conclusions follow:1. Based on the wind power system dynamic model with wind power absorption of reactive power as control parameter and the application of chaos theory in wind power system, chaos phenomenon and voltage stability are analyzed, and the effect of reactive power compensation of the system on the chaos phenomena is further analyzed. The results show that:when the reactive power absorbed by the wind farm increases to a certain value, chaos phenomenon will appear in the system, which can lead to the continues seemingly random oscillation of wind power system’s voltage to sustained, eventually lead to system instability; the adding of the reactive power compensation static var compensator(SVC) to can delay the occurrence of chaotic phenomena, at the same time also weaken the chaos oscillation strength, and improve the system running stability domain and voltage quality to a great extent. But as far as completely eliminating chaos is concerned, the effec is limited.2. Based on the wind power system dynamic model and external load disturbance set up for the wind power system, the chaos phenomenon caused by external periodic active load disturbance and periodic reactive load disturbance are studied respectively, among which the influence of disturbance amplitude and disturbance frequency to the chaos are discussed. The simulation analysis indicated that:Whether the active load disturbance or reactive load disturbance, when the disturbance amplitude changes, the system exists a chaos area, only when the trajectory is out of this area and the chaotic attractor ruptures, the system will lose instability, such situation will favour the control of chaos, but for the disturbance frequency changes, there is no chaotic area, the chaos system will become unstable directly.