Design And Implement Of VSCF Doubly-fed Wind Power Generator Experimental Platform Based On TMS320F2812

With the development of global economy, energy sources consumeincreasing daily and environment empoison being serious gradually. In orderto solve the difficult problems of environment pollution and energy resourcein short supply, people must adopt the sustainable development strategy anddevelop the regenerative energy. Wind power, as renewable, no pollutionenergy source, is paid great attention by more and more countries. Thetechnology also becomes research hotspot of many country's scholars.Wind power generation technology can be categorized into two classes,Constant-Speed Constant-Frequency (CSCF) and Variable-Speed Constant-Frequency (VSCF) wind power generation, and each of them have manyforms. VSCF double-fed wind power generation system adopts double-fedinduction generator (DFIG), which stator connected with electric networkdirectly and the AC excitation converter is located at rotor side. When therotor speed varies with wind varying, the frequency of stator current can bemaintained by regulating the frequency of rotor AC excitation current. Because the converter only deals with slip power in double direction, so thiswind power generation system is not only characterized by its small cubage,light weight and low cost, but also realizes flexible connection ofmechanical-electric system. Currently, VSCF double-fed wind powergeneration system has been mainly applied. This paper takes the operationand control of VSCF double-fed wind power generator system as the researchsubject, focuses on the study of the rotor-side converter, develops anexperimental platform of VSCF double-fed wind power generator system,which is controlled by TI's DSP chip TMS320F2812.Firstly, this paper analyzes DFIG operation theory, including mathematicmodel of DFIG, coordinate transformation and DFIG power relationship,which establishes the theoretical foundation for succeeding study. Secondly,field oriented vector control technique was applied to DFIG control. A vectorcontrol strategy based on stator flux oriented was presented. At last, thecharacteristics of dual PWM converter and the principle of grid-side PWMconverter was discussed. The control principle of the rotor-side PWMconvector, the function of which is to control the power of generator andadjust the speed for the maxim wind power capture scheme, was analyzed indetail.On the aspect of hardware design, in order to study the control method ofthe rotor-side PWM converter, an experimental platform of VSCF doubly-fed wind power generation system was established, which takes the TI's DSP chipTMS320F2812 as its central controlling part. This paper discusses the designof the main circuit and the control circuit in detail, summarizes the hardwarereliability and anti-interference design, analyzes EMI resources andapproaches, and puts forward some effective hardware anti-interferencemethods. On the aspect of software design, the basic principle of space vectorpulse width modulation (SVPWM) is discussed in detail, and two methods(SW SVPWM and HW SVPWM) with which SVPWM is realized based onTMS320F2812 are introduced.Every functional circuit of the experimental platform is debugged in theco-design view of hardware and software. The experimental research of motorspeed regulation using open loop constant voltage frequency ratio and DFIGVSCF operation were carried out with lots of experiment datum achieved.The experimental results testify the validity of the theory and show theaccuracy, stability of the experimental platform.