Research On Dynamic Design Of The Self-charging Series Voltage Transient Variation Compensator And Its High Precision Digital Implementation

With the power electronics technology widely used, the household appliances popularity, the electric arc furnace development, etc, their nonlinear, impact and unbalance of electrical characteristics lead to the deterioration of the power quality. And the problem of the grid-harmonics, the three-phase unbalance, and the voltage fluctuations and flicker have become increasingly serious. In the other hand, the proliferation of computers, the development of IT industry, the application of microelectronic control technology for power quality has become increasingly high demand. According to massive statistical information, voltage sag happens frequently, and is the most harmful danger in all the power quality problems. So, the issue of voltage sag has become more and more concerned and one of the urgent problems.This paper is based on the study of the current domestic and foreign related series voltage transient variable compensation device, combined with previous studies in the laboratory. With the high precision digital implementation series voltage transient variable compensation device which is put forward by the laboratory. The main work includes the following several aspects:1. Introduced the existing experiment conditions, on the basis of analyses its network features, redraws control block diagram of the system,Analyzed the load voltage tracking loop defects of continuous domain controller design before and redesign its closed loop controller. Finally dynamically redesigned voltage compensation device of the other two closed loop system, which are the bus bar voltage amplitude constant close loop and bus bar voltage amplitude symmetrical close loop.2. Designed the discrete control system, determine the sampling time, determine the regulator discretization method, determine the coefficient and variable scaling digits.3. The digital implementation of control system, STM32 micro controller is introduced, Expounds the on-chip hardware resource configuration and program design, the part program design are analyzed in detail.4. On the Matlab simulation platform, respectively the simulation verify the feasibility of continuous and the discrete design, And in the experimental platform for the dynamic design of the system is verified.