Abstract
This paper reviews the possibility of implementing a buck-boost AC/AC converter with a changeable configuration, which ensures quasi-sinusoidal characteristics of source and load current. Load is made up of active and inductive components, with a parallel-connected smoothing capacitor whereas at the input stage a current-smoothing LC input filter is applied. The process is controlled by four bidirectional semiconductor switches, from which two are active in each of the operation modes. An explanation of electromagnetic processes in both of the operating modes is given, in order to show how the mathematical description of the circuit functionality is acquired. Computer simulation results are introduced as well, providing a comparison of calculated and simulated parameters at both the buck and boost operation cases.
Highlights
AC voltage control has been effected by using transformers; in addition, more frequently, semiconductorcontrolled tap transformers have been used
The process is controlled by four bidirectional semiconductor switches, from which two are active in each of the operation modes
It has to be noted that both sides – input and output – must be supplied with LC filters in order to smooth a current [13], [14]. Instead of load, another AC voltage source is connected, with a source voltage amplitude higher than the input one and with the same frequency, and even with a small phase shift between both voltages, by using switches S4 and S3 at a constant on position of S1 and a constant off position of S2, reverse buck mode operation can be ensured with power flow from the output source to the input AC grid
Summary
AC voltage control has been effected by using transformers; in addition, more frequently, semiconductorcontrolled tap transformers have been used. Lessening of the previously stated drawbacks for the case of limited change of output voltage by 15 % to 20 % from the input value along with decrease of the transformer power rating and size can be done by using an autotransformer that has a step voltage controlling mode or a uniformly controllable voltage regulation mode [11], [12]. Both modes are implemented by using semiconductor switches.
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