Abstract
High-performance high-frequency inverter systems for voltage source applications such as UPS represent a demanding application that cannot be easily realized using conventional PWM inverter modes. New controller structures are necessary to cope with stringent voltage regulation and distortion constraints in the presence of nonlinear loads. This paper presents a simple but intelligent hysteresis controller. It utilizes all possible inverter topologies in addition to feed-forward strategy to achieve low output ripple, minimum switching frequency and excellent transient performance. These features were not available until now. The result verifying the concept, using pspice program for practical electronic control circuit and power devices, are presented Although this paper explains the implementation of the 3-phase control and power circuits that can adapt itself in case of nonlinear and unbalanced loads.
Highlights
AbstrlJCt- High-pcrfonrumce high-frequency inverter systems for voltage source applications such as UPS represent a demanding application that cannot be realized using conventional PWM inverter modes
The conventional approach to realize high frequency of inverter systems is through the use of a variable voltage inverter, where a front-end chopper is used to control the voltage
The conventional hysteresis modulator swirches the bridge to apply either A positive voltage pulses if the output voltage is less than the reference voltage and vice versa
Summary
The conventional hysteresis modulator swirches the bridge to apply either A positive voltage pulses if the output voltage is less than the reference voltage and vice versa This control skategy produces high ripples and requires high frequency. The hysteresis controller shown in Fig. l(a) develops the necessary driving signals to activate either of the two diagonal pairs T1-T3 and TI-T4 to apply a positive or negative voltage across the inverter terminals. For pllsitiv~ period, P-COM activates transistor 11 During this time the output terminal will be switched between -E and 0 according to the generated pattern by the hysteresis controller HCOM In a similar manner, T4 will be activated for negative period to produce tenninal voltage of -E or O. The signal produced by the HCOM determines the tenninal voltage magnitude to be E or OV, while the polarity comparator P-COM detemrines the polarity of the tenninal voltage
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