Abstract
A series connected power semiconductor array, with digital control capability could be used for developing single phase AC regulators or other applications such as AC electronic loads. This technique together with an ordinary gapless transformer could be used to develop a low cost AC voltage regulator (AVR) to provide better or comparable specifications with bulky ferro-resonant AVR types. One primary advantage of the technique is that digital control can be used to minimize harmonics. Commencing with a review of AC voltage regulator techniques for single phase power conditioning systems, an analysis and design aspects of this technique is presented with experimental results for AVRs. Guidelines on how to utilize the technique in a generalized basis is also summarized together with a summary of a technique for achieving harmonic control.
Highlights
With the proliferation of electronic systems based on submicron feature transistors, power quality (PQ) has become a major concern for end users as well as distribution authorities around the world [1,2,3,4,5,6]
A series connected power semiconductor array, with digital control capability could be used for developing single phase AC regulators or other applications such as AC electronic loads
Overall achievements in this work are: 1) A versatile AC impedance control technique which can be used in applications such as AC voltage regulator (AVR) and power conditioners; 2) A new digital control technique where additional digital waveform control can be added to the system to minimize harmonics in the current waveforms
Summary
With the proliferation of electronic systems based on submicron feature transistors, power quality (PQ) has become a major concern for end users as well as distribution authorities around the world [1,2,3,4,5,6]. Item 3) was a common occurrence in Sri Lanka during the drought periods with long power outages, where the first part of the work presented in the paper was carried out In these cases frequent malfunctions of some commercial line interactive type UPS systems with ferro based AVRs were a common occurrence. Key requirements in developing AVR techniques suitable for modern power conditioning requirements could be summarized as: a) Reliability of operation in surge-prone PQ environments; b) Efficiency under all load levels and load power factor situations; c) RFI/EMI minimization; d) Output harmonic minimization; e) Speed of the control loops within the regulator; f) Operability within the extremes of input line voltage limits; g) Energy storage for short duration ride through requirements. Complex circuitry RFI/EMI problems (in switching technique based ones) Reliability issues in environments with high common mode transient surges
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