Reasearch And Design Of The DSP-based Three-phase Static Inverter

With the continuous improvement of tactics index and general performance, airplanes are equipped with more and more high-tech electron devices. The performance of the static inverter has become more and more important since it is a basilic part of secondary power source in airplane which ensures the electron devices to work normally. At present, digital control is one of the most promising technologies to design the electric and electronic devices. So the study of static inverter digital control has practical significance, and this paper aims at the digital-control system design for static inverter.Firstly, three-phase static inverter under the space vector pulse width modulation (SVPWM) is analyzed. Then instantaneous control for three- phase static inverter is implemented in the synchronization frame through dq transform to get the information about amplitude and phase of output voltage. Also the small-signal model is established to design the parameters for system adjuster. The control method is validated by MATLAB. Thirdly, the hardware platform is constructed for three-phase static inverter controlled with the LF2407A DSP. The hardware circuit, software program, etc. are introduced particularly. Finally, the experiment waveforms and data about 1.5KVA three-phase static inverter are described and the results indicate that the system has excellent dynamic and static state performance.