Determination of the Possibility of Alternating-Current Voltage Stabilization Using a Polarity-Inverting Pulsed Converter. Part 2

详细

The properties of ac voltage stabilizers based on an inverting pulsed converter in the presence of input voltage waveform distortions and sharp dips of voltage are estimated. The stabilizer performance was determined on the basis of the limiting continuous model thereof considered in Part I of this paper. For correction of the voltage waveform and elimination of sharp short-term surges and dips of the stabilizer output voltage, control of the instant output voltage is introduced to regulate the relative times that the key stays in extreme positions depending on the relation between the instant input voltage value and the selected output voltage. It is established that the stabilizer properties are influenced mainly by variable coefficients of the differential equations describing the limiting continuous model of the stabilizer. It is shown that, if the input voltage waveform is distorted because of periodic variations of the coefficients of differential equations, the output voltage will also contain high-order harmonics. Their intensity decreases with decreasing electrical impedance of the choke. It is also shown that surges of the stabilizer voltage are almost instantly compensated because of the change of relative times the key stays in extreme positions. However, this does not eliminate transition processes occurring as a result of drastic changes of the coefficients of differential equations of the limiting continuous model of the system. Comparison of the processes in the real discrete stabilizer model and in the stabilizer limiting continuous model for a quite realistic switching frequency showed their practical identity.