Some of the sensitive loads like the communication equipments, computer systems and process automation equipments could introduce voltage imbalance in the single phase power supply. In order to enhance the voltage or to manage the voltage regulators were used which introduced input side and output side harmonics. This paper is an attempt to develop an ac-ac buck boost topology that would introduce the voltage regulation in single phase AC systems. The system consists of an AC chopper which is derived from the DC buck boost chopper. The AC buck boost chopper would work in four quadrant operation and thus needs the bidirectional switches to operate it. According to the IEEE 519 standard for the total harmonic distortion (THD) the input current THD must be less than 5%. Thus an input side LC filter is used to obtain the input current THD reduction. The higher efficiency AC chopper for voltage regulation is developed with the regenerative DC snubber connected to the switches which observe the energy stored in the stray inductance. Matlab Simulink model is created to have a closed loop operation of the implementation with the zero crossing detectors and to engage in the PWM that it would provide for the voltage regulation. An open loop AC chopper circuit is designed with RL load and hardware is implemented to observe the buck and boost operation of the converter. The FFT analysis is carried out in order check the Total Harmonic Distortion of source current, output voltage and current. The hardware results obtained is confirmed with the simulation result obtained.
BASAMMA R "POWER QUALITY IMPROVEMENT USING BIDIRECTIONAL AC CHOPPER WITH RL LOAD" Iconic Research And Engineering Journals Volume 2 Issue 12 2020 Page 18-31
BASAMMA R "POWER QUALITY IMPROVEMENT USING BIDIRECTIONAL AC CHOPPER WITH RL LOAD" Iconic Research And Engineering Journals, 2(12)