Research And Design Of Single-Phase AC Voltage Control With Thyristor In Digital Control

Electric energy is one of the most important energy for the human production and life.Reasonable,efficient,accurate and easy to use electric energy is still a major problem.Stability,reliability,accuratcy and efficiency are important for power supply,but small size and light weight are also very pressing needs.At present,high frequeney,small components and structures is the primary mean to solve the problem.Power electronics technology in the power supply brings a revolution in the use of electric energy.The technique of phase-control AC voltage regulator has a faster response time,which is less than a cycle voltage power.But the output voltage and current contains a lot of harmonic,so it requires a larger capacity filter and has low power factor.The technique of AC voltage regulator with chop-control is a new and high-Performance technology.Based on analysis of harmonic output voltage of chopping AC voltage regulator and automatic control theory,the paper designed an AC voltage regulator scheme.First,we compared and analyzed harmonic of the Phase voltage regulator and the voltage regulator with chop-control, and proved the advantage of the voltage regulator with chop-control,and analyzed the principle of the voltage regulator. After that,the paper designed the main circuit,including the parameters of the output filter circuit and buffer circuit in order to aehieve digital control. The hardware and software design of the system of AC voltage regulator are designed based on Dspic30f6014a as a core control devise.The current and voltage double closed loop control system of voltage regulator is comfirmed,the Fuzzy-PID control technique is used in voltage loop and the improved PID control technique is used in current loop.This improve control technique was used to realize the steady soft starting and voltage power regulation of the system.Chopping AC voltage regulator is easy to filter and the output voltage has fewer harmonics from experiment.Compared to Phase-control AC voltage regulator chopping AC voltage regulator has more advantages. Digital control have many advantages,such as static and dynamic Performance,high-Precision,short-cycle,better man-machine interface and telecommunication. Digital control is also one of the innovations in the thesis.