The Design And Implementation Of Controlled Rectifier’s Key Technology In UPS/EPS

UPS(Uninterrupted Power Supply) and EPS(Emergency Power Supply) are invented for supplying electrical equipment with uninterrupted and high quality power. The demand of UPS and EPS are increasing in an era of informatization, intelligentize and automatization. Rectifier system as an important component of UPS and EPS has been getting more attention. And thyristor rectifier are widely applied in the UPS and EPS of high power capacity. We usually control rectifier as a separate system by using the discrete analogue device or analogue integrated chip. However when the load is battery, battery’s charging-discharging and energy storage has a significant effect. How to combine thyristor rectifier and battery’s charging-discharging and energy storage is a key problem of the whole system optimization. Based on the current research status of thyristor rectifier and battery management, combined with the microprocessor control technology and wireless communication technology, an improvement system included thyristor rectifier and battery management are designed in this article, and mainly finished the following work:1)Briefly analyse the characteristics of the full controlled rectifier thyristor. 1)Combining the application of microprocessor in power electronic control, design a digital control system included the trigger and control of thyristor. Realize multiple functions such as the synchronous signal phase lock, phase sequence adaptive of three-phase signal, thyristor trigger, PID adjustment, exception handling system and alarm.2) Briefly analyse the characteristics of Lead-acid battery. Designed an improved battery charging and discharging system and battery SOC estimation system based on the existing method of battery SOC estimation and digital control of thyristor rectifier.The improved system can meet the steady operation and rapid charge and discharge requirements. Combining ampere-hour integral method and kalman filter, estimated the battery SOC by use the external characteristic parameter.3)Combining the wireless communication technology, built a one-to-many star 3)wireless networks based on the Simplici TI protocol and the way of MSP430FR5739 + CC1101 l, which can accommodate multiple nodes. Transmitting battery’s monitoring information by wireless spectrum of 433 M can overcome the shortcomings of traditional wired communications.4)Finally completed the building of a model machine, and ran some relevant 4)experiments on this machine. The results indicate that the model machine has a simple structure, multiple protection function and can work properly. Besides the charge and discharge of the battery are normal running. The monitoring information and the estimation of the battery’s SOC are also accuracy.