Design And Research Of DSP-based Online UPS Power Supply

Uninterruptible Power Supply(UPS)is capable of providing high-quality electrical power and ensure the continuous supply of electricity power electronic devices.Because of the continuing progress of modern society electrical technology,there has been a wide range of load devices,their performance and power requirements are different,but all of the power quality requirements continue to increase,or in case of power failure can be sustained load supply.Especially in the fields of military equipment,information transmission,storage bank,hospital and other quality requirements of power supply and sustainability require more prominent.And because of the nonlinear characteristics of the load equipment,power supply equipment for the inverter output requirements more accurately.This shows that demand for UPS equipment has become a trend.According to the actual need for DSP-based online UPS power supply design and research.Based on the actual needs of the power supply environment equipment and all kinds of UPS rational analysis and synthesis come to UPS circuit topology and control DSP-core options.According to UPS specific technical specifications,design the various parts of the hardware circuit,and the calculation,selection.Secondly,specific control objects in order to improve the quality of the waveform of the inverter,using the proposed control system design based on improved repetitive control.After passing through the correspondence repetitive control system comprehensive and detailed analysis,the stability of the system,the error convergence rate and steady-state error of the three factors which influence the subject.In order to control the effect of waveform distortion,notch filter to eliminate the use of inverters in the frequency domain of the resonance peak,and then use links lead to compensating repetitive control endometriosis lags.On this basis,the inverter is modeled simulation test,compared to the same situation when using repeated control and waveform distortion open loop size proved repetitive control for suppressing waveform distortion of outstanding results.With PID control were compared under the same conditions,to verify the effectiveness of repetitive control nonlinear unbalanced load control.Then DSP / TMS320F2802 chip as the core,a digital closed-loop control scheme to ensure that the system is high-speed,real-time and reliability requirements.Then according to specific performance indicators DSP design and its supporting auxiliary circuits.On the basis of hardware design,according to the functional requirements of a given system software processes.Finally,build a prototype assembled on the prototype of the relevant experimental results show that good quality inverter system waveform repetitive control,high steady-state accuracy,the output voltage waveform distortion,the system has good stability state property,has a certain response time,meet the requirements of technical indicators to give satisfactory results.