Based Dsp Controlled Single-phase Shunt Emergency Power Research

EPS(Emergency Power System) is a kind of emergency power and derived from the UPS (Uninterruptable Power Supply) power. Because of its reliable performance, easy management, security, environmental protection, long life, flexibility and diversity of design advantages, it is widely used in electrical equipment, or be as the hot standby power and cold start power for the city power..This paper studies a single-phase power supply which can be parallel working. The EPS uses a digital control technical by DSP, and achieves the goal of green products, high-tech and low-cost requirements.This paper first introduces the concept of the emergency power supply, the difference to the UPS, as well as the development trend and the significance of parallel technical.The second chapter builds the Buck / Boost circuit model and full-bridge inverter circuit model on the base of the main structure of the circuit EPS, then carries out the Saber simulation analysis.The third chapter gives the simplified mathematical model of multiple parallel systems. Make the analysis of the impact of the key factors, the average output current. Point out the complex relationship of inverter output impedance, output voltage amplitude and phase between the active and reactive circulation current.The forth chapter shows us the traditional parallel control methods and current-sharing control methods.The fifth chapter gives hardware implementation and software control through DSP chips of the emergency power supply system, and presents the flow chart of the system.