Study On The DSP Control Of The Convertor For Wind Energy Conversion System

This dissertation is a part of the project of developing MW-level Wind Energy Conversion System which is a key 863 program. It is mainly about the wind energy conversion system with a rated output of 1.2MW which applied to the variable speed constant frequency wind energy system (VSCF). The focus is on the control method of the converter in the wind energy conversion system(WECS).This paper first generally describes the wind energy conversion systems, then gives the two main wind power generation technology high-level power direct-drive and gear-drive. The research background of this paper 1.2MW wind energy conversion system is just based on the topology of high-level power direct-drive, it utilizes the AC-DC-AC conversion configuration to deliver the high-level power energy from permanent-magnet generators to the grid, the power rating is 1.2MW. A detailed analysis of the main circuit introduction, control method and working principle of the direct-drive wind energy conversion system are given to introduce the two important parts a of this paper:First part is the control method of the multiple boost convertor(AD/DC), the important instantaneous current control method of this paper is given through the analysis of the main circuit structure, control method and working principle. Then a steady-state analysis for low-frequency, a high-frequency component analysis, and a closed-loop tracking performance analysis for dynamic response are provided to analyze the method proposed; And the second part is the control method of invertor(DC/AC). The focus is the analysis and implementation of instantaneous current control, including inductance current control loop and DC voltage control loop.Control circuit based on DSP TMS320F2812 is designed to control the two parts of the converter. And then parameters, instructions and software flow chart are given.At last, experimental results and correlative analysis of the boost converter and inverter are given to draw the conclusion. The theoretical results are verified experimentally. The results show that the method can effectively restrain the low-frequency harmonics and has a fast dynamic response, and is suitable for wind power.