Abstract
Traditional Static Synchronous Compensator(STATCOM ) compensates most singly for reactive power or steady state voltage in high power field. On this point, the paper puts forward a harmonic frequency compensation technique, which can realize dynamic reactive power compensation as well as harmonic control of less than 20th power. Then, using average switching method, it gives the mathematical model on the device. Active and reactive current decoupling is realized. For the electrical model, the compensator developed uses 8-cascaded H bridge structure, together with the carrier phase-shifted SVM technology, can realize 17 level voltage waveform output, having high utilization and easy to realize digital. Finally, simulation and experimental results show that the harmonic frequency control technology developed for 6kV cascade compensator can be used on the actual electric network, with low switching frequency. The device can together compensate reactive power and control harmonic accurately and effectively.
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