Current-Waveforms Control Of Switched Reluctance Wind Power Generation System With VGVC Drive

Nowadays, energy and environment are pressing problems in survival and development of human. The development of wind energy resources exists a huge economic, social, environmental value and development prospects. It has a prominent role in reducing pollution, adjusting energy structure and solving electricity problems in remote areas. Switched reluctance generation (Switched Reluctance Generator, SRG for short) has many outstanding features such as: simple structure, small moment of inertia, huge starting-torque, a flexible control strategy, simple and reliable power circuit. Hence it has broad application prospects in the wind power generation system.When the wind speed is low, the back-EMF of the generator could be lower than the generation voltage. As a result, the phase current will not increase at the generation stage, therefore, energy conversion efficiency of the machine are reduced. Moreover, this paper presents a variable generation voltage converter (Variable Generation Voltage Converter, VGVC for short) topology which can control the generation voltage independently to avoid the phase current decreasing. It can regulate generation voltage increase the phase current in generation stage improve the motor efficiency by controlling power converter switch on-off.Conventional SR wind power generation control system with VGVC drive adopt the angle position control. Generation reference voltage is determined by motor speed and the excitation voltage. However, random changes of wind speed will result in failure of generator control system, and directly affect phase current in the stage of generation. It was found by simulation and part of the experiment: Phase current turn-off and the maximum current is closely linked to generation voltage. In order to overcome the above disadvantages, this paper presents a current-wave control of SR wind power generation system with VGVC drive. The control strategy turns speed into the current to impact on the system. It can meet output power requirements and optimize to efficiency by controlling turn-off and maximum phase current.The platform experiment of a four phase 8/6 SRG wind power generation system is built, the model is simulated by using MATLAB simulation software. The results of simulation and experiment present the current-wave control of SR wind power generation system with VGVC can improve the phase current waveform efficiently, increase conversion efficiency of the system and also verify the validity and feasibility of the control scheme.