Repeated control of the principle of all digital UPS inverter circuit diagram

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Overview:
To measure the performance of UPS inverters, there are usually some indicators: voltage, frequency, total harmonic content (THD), load regulation, dynamic response, etc. The quality of these indicators is closely related to the control of the inverter. of. Since the analog control technology of power electronic equipment has some shortcomings that it cannot overcome, the control method has lagged far behind the development of modern control theory, so its transition to digital control is an inevitable trend.

The application requirements of UPS are very high. Therefore, the single voltage loop control obviously cannot meet the application requirements. In order to improve the static dynamic characteristics of the inverter, multi-loop control technology is needed. Current mode control is a multi-loop control strategy. It uses the error voltage regulation output as the feedback current command to obtain better static dynamic characteristics, but it cannot solve the output voltage THD under non-linear load (such as rectifier bridge load). Higher problem. In recent years, with the introduction of dedicated DSP for motor control, DSP-based inverter digital control technology has developed rapidly, and the application of waveform repeat control technology can effectively solve the above mentioned problems. However, there are disadvantages to repeated control, that is, its dynamic characteristics are very poor. The composite control introduced in this paper combines the above two control methods to improve strengths and avoid weaknesses and achieve good results.
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