Research On Digital Single-phase Voltage Regulator With Controllable Phase And Amplitude

This article mainly discusses the research of digital single-phase voltage regulatorwith controllable phase and amplitude (VRCPA) which use DSP to realize the closed loopcontrol of phase and amplitude.This paper choose TMS320F2812as mainly controlchip,the controller has simple peripheral circuit,convenient control and high controlprecision.First of all,this paper detailedly introduces the circuit structure and working principleof the instantaneous single-phase Boost AC/AC converter.The generation of sinusoidalwaveform reference voltage signal is the design point.In order to real time compare withthe output voltage,the sinusoidal waveform reference voltage signal must be synchronouswith the output voltage.The sinusoidal waveform reference voltage signal which generatedby EV is with high sine degree,good stability,small THD.This paper does some simulationon this converter and a prototype of instantaneous single-phase Boost AC/AC converter ismanufactured,the simulation and experimental results show that output voltage of theconverter is with high waveform quality and high stabile amplitude and frequency.Secondly,this paper analyzes the main circuit structure and working principle of thedigital single-phase VRCPA.The pre-stage converter use EV to produce control signal.Bydynamically adjusting control parameters K0,the control signal can realize the closed loopcontrol of phase;The back-stage converter firstly uses ADC to collect the output samplingsignal,and then the sampling signal and the given reference voltage signal generate errorsignal,and then does digital PI control on the error signal,finally uses EV produce controlsignal which can adjust amplitude of output voltage.By dynamically adjusting back-stageduty ratios,the control signal can realize closed loop control of amplitude.Thirdly,the paper introduces some modules of DSP and gives software design ofVRCPA’s pre-stage and back-stage. Finally,on the basis of theoretical analysis,a prototype digital single-phase VRCPA isdeveloped.This paper does some experiments on this prototype.The experimental resultsdemonstrate the validity and feasibility of the theoretical analysis.