Design And Research On The Laboratory Platform Of Grid Connected Converter For Wind Power Generation

As an important part of new energy,wind energy is the most sophisticated electric power generation technology in all of the new energy strategies.It has enormous commercial potential. So Wind generation technology attracts great attention around the world.Parallel Modules is the usual way in ord to increase the total power of the converter system and realize the redundancy design.This paper analyses three strategies of modules parallel technology, concludes that the circuit level parallel is the most suitable way for the system.Based on that a new method of carrier-shifted SPWM was proposed which makes the parallel system obtain a higher equivalent switch frequency based on the original frequency. As a result,it improves the output current of the converter and makes the design of output filter easier.The LCL filter has very better filter attenuation with low inductance.It also can increase the converter's voltage output ability and enhance the dynamic response. The paper recommend a good way for LCL filter design.To reduce the stray inductance at dc bus, The paper also introduce the noninductive bus bar .With this design, the turn-off voltage spike can be suppressed .The design of control system is very important for the system. The system used the PI Compensation network and made the system run stably at closed loop.A method to generate multipath SPWM by FPGA is proposed.A generator by FPGA can generate multipath SPWM waveform which needed in the carrier-shifted SPWM. The circuit is simple and the system's reliability is enhanced.Based on the design above,the converter was assembled and debugged.The experimental results proved the feasibility and of the design.