Study On The Energy-Feedback Electronic Load And Its Digital Control Method

Into the21st century, power electronics technology as a technology has been rapidlydeveloped, power electronic equipment also came into being, and has been widely used,such as uninterruptible power supplies, Shaking table-driven power, power filters,communication power supply, power static reactive power compensators, AC regulatedpower supply, battery, etc. In the factory characteristics test for these power electronicdevice are essential programs, such as the discharge output characteristic test, aging test,and test its performance and specifications. Traditional testing methods are generallyused static physical load loads such as resistors, capacitors, inductors, series or parallelcombination. Using these loads to test, there is a lot of problems and shortcomings: First,according to the different performance indicators need to prepare a lot of static load,needing larger investment, and lacking of flexibility; Secondly, traditional forms of loadcannot simulate special characteristics load, such as constant-current load and constantpressure load, Constant power load, nonlinear load; Third, all energy inputed to theseloads in the form of thermal energy being consumed, causing huge waste of energy,higher demands on heat, so it is not easy to meet the test of high power applications. Asrequirements of improving test automation and energy requirements, it needs a new typeof power equipment.Electronic load is a power electronic equipment to overcome these traditional loadshortcomings these traditional load, is Comprehensive application of computer controltechnology, automation technology and power electronics technology. It can easilyachieve a variety form of load, with flexibility; Electronic load can made energyabsorbed to unity power factor back to the power grid, save electricity, its loss poweronly for line loss and the switching losses PWM converter, so it meets high powertesting occasion. Therefore, feed energy-electronic load has become a hot research inlaboratory and power production enterprises, and with broad market prospects.This article first describes overall scheme for energy-feedback electronic load,AC-DC-AC and dual PWM converter as the primary topology dual PWM converter,analysis principles of simulation of PWM rectifier side arbitrary load model, principle ofunity power factor PWM inverter side energy feedback principle and stability of DC busvoltage and system start programmer, and design parameters such as capacitors,inductors, power switching valve in the main circuit. And then design a schematicdiagram of the control system and digital design, including voltage and current testingmodule, driver modules, system digital control module. In the end, this paper builds anexperimental platform to verify the system and gives a few of comparatively satisfactoryresults. Results show that the energy-feedback electronic load scheme set out in thisarticle could be accurate simulation any load model and can also made power energyabsorbed to feedback network.