Doubly-Fed Wind Power System Electromagnetic Compatibility Design

With the rapid development of new energy technology and strong growth in the proportion of wind power, the significance of research for wind power system electromagnetic interference is becoming more and more evident. This paper is mainly based on research of doubly-fed wind power converter electromagnetic interference problem. In order to improve electromagnetic compatibility of the whole wind power system this paper presents research of system electromagnetic interference source 、grid-connected LCL filter、motor side filter and magnetic ring respectively.The main contents can be concluded in the following four paragraphs.(1)Problems about doubly-fed wind power converter electromagnetic interference source are classified. Gaining interference source mode which caused by PWM technology. Defining IGBT lead interference source by analyzing the IGBT turn on/off transience process. Analyzing IGBT working condition of single bridge inverter and defining as main circuit parasitic parameters lead interference sources.(2)The doubly-fed wind power system grid-connected LCL filter is designed. Taking SVPWM as an example and figuring out the 3.6MW grid-connect inverter LCL filter particular parameter, concluding that the LCL filter can satisfy the grid power quality by simulation.(3)The doubly-fed wind power system motor side filter is designed.Motor terminal parallel connection RC impedance and inverter side du/dt filter are designed and proved available. Putting RC impedance and du/dt filter together. Gaining the whole overvoltage suppress design and proving it available and superiority.(4)The doubly-fed wind power system magnetic ring is designed.Studying back to back converter electromagnetic interference conductionpath and summarizing the installation site of common mode and differential mode magnetic ring. Summarizing the magnetic ring design and verifying its function in the system of doubly-fed wind power by experiment.The above constitute doubly-fed wind power system complete electromagnetic compatibility design. Improving the system anti-interference ability and having good engineering practical value.