The Research On Control Strategy Of The High Voltage Inverter

High voltage AC drive systems have bright prospect in high power pumps and fans,rolling mill and so on, where using adjustable speed scheme can not only save energy greatly but also improve the dynamic performance of the motor. With the development of high-voltage and large-current device ,multilever-inverter becomes the most popular topology in high-voltage adjustable speed scheme. The main contents are shown follow:This paper describes the various high-voltage converter topology, and a detailed study of Cascade High-voltage converter topology, introduced in the inverter main parts: power unit. In order to improve the reliability of high-voltage inverter, a high voltage inverter design of the bypass.This paper introduced the two high-voltage inverter control strategy: SPWM SVPWM control technology and control technology, SPWM technology through a series of pulse width modulation, equivalent to access to the necessary waveforms (including the shape and amplitude ). With multi-level inverter topology of the proposed symbiotic, not only because it decided the multi-level inverter realize it or not, and the multi-level voltage inverter output waveform quality, active and non-circuit Sources of stress device, the system loss reduction and efficiency improvements have a direct impact. Then on the SVPWM with the fundamental principles and modulation methods, in SVPWM carrier phase-shifting technology and the basic method SPWM technology on the basis of the space vector in a row of symmetrical switch modulation methods (Qiduan Law) and, alternately, and other vector switch Optimization of the frequency of several methods used to phase shift voltage vector space, but also gives a specific method.The article finally given the high voltage inverter and the hardware structure designed by 6 KV-900KW unit Cascade High-voltage power converter experimental waveforms, the running of the indicators have reached the target.