A New Transformerless Single-Phase Buck-Boost AC Voltage Regulator

作者：Yalcin Faruk^*; Himmelstoss Felix A

来源：Advances in Electrical and Computer Engineering, 2016, 16(2): 63-68.

DOI：10.4316/AECE.2016.02009

• AC voltage regulator
• buck-boost converter
• PWM
• THD

Voltage regulation is one of the important goals for electrical sources and consumers. In this paper a new transformerless single-phase AC voltage regulator based on buck-boost converter topology is presented. The regulator circuit has a simple structure using only two bidirectional active switches, one inductor and one capacitor. A closed loop control system is implemented for the proposed regulator operation. A control law depending on the instantaneous values of the regulator's real input and desired output voltage is obtained and supports the PI controller. The control law allows the controller to obtain efficient pulse width modulation (PWM) switching duty ratio for the desired output voltage when the input voltage has surges or fluctuations and the output load is changed. An experimental laboratory setup has been implemented for the proposed AC voltage regulator. The obtained results demonstrate that the proposed topology is capable of and efficient for both bucking and boosting the input AC voltage to a high quality output voltage with a low total harmonic distortion (THD) for different input voltage and load conditions.

• 出版日期2016