Research On The Control Strategy Of Regeneration Converter

Most rectifiers of the traditional converter use a diode bridge circuit, and thishas the disadvantage of being low power factor, high level of input currentsharmonic and high waste of regenerative energy. The regeneration converters whichhave the advantages of power bidirectional flowing, low input currents harmonicand hiah power factor have been widely used in these high power applications, suchas elevators, electric vehicles. In this paper, an integration control algorithm forregeneration converter with space vector modulation is mainly investigated.The topology of PWM rectifier and inverter is firstly studied in this article, andmathematical model is established in stationary reference frame. The ST-DPTC andFOC are investigated respectively. Then Bang-Bang control with hysteresiscomparator is applied to control active and reactive power, torque and flux inST-DPTC. The simulation results show that ST-DPTC appears high torque ripplesand variable switching frequency.Aiming at the feature of ST-DPTC and FOC, a control algorithm by usingdirect power and torque with space vector modulation (DPTC-SVM) is presented.The DPC algorithm with space vector modulation and virtual flux (DPC-SVM) isapplied to the PWM rectifier, and the DTC algorithm with space vector modulation(DTC-SVM) is applied to the PWM inverter. A DPTC-SVM scheme withclosed-loop of active and reactive power, torque and flux control is studiedrespectively in this paper, and design the parameters of PI controllers. Also theDPTC-SVM simulation results which are established in MATLAB show theadvantages of constant switching frequency lower current harmonics, unity powerfactor, and lower flux and torque ripples.Finally， the integration control algorithm which is accomplished by anadditional power feed-forward loop is investigated. The DC-link voltage controlloop is obtained by an additional power feed-forward control. The parameters ofcontrol loop are calculated, and the system stability with the PF is analyzed. Thesimulation results show that the system with PF has rapid dynamic response, reducesvoltage ripples and the capability of the DC-link capacitor.The regenerationconverter is applied to drive elevator system. The main application performance aremainly analyzed in power regeneration system, and the experimental waveforms andtheory analysis of the regeneration converter prove its good performance.