Research On Single-Phase Energy Feedback System

With the development of social economy, people pay more and more attention on energy source problem. Energy feedback system researched is aimed at settling these questions. Energy feedback system plays an important role not only in cutting down waste of energy, but also in utilizing green-energy. Now, this system is used in electronic power load, distributed generation and motor braking feedback.Single-phase energy feedback system is researched in this paper. The system is designed to transfer renewable energy that has the same frequency and same phase with power network into AC power network at unit power factor. This device saves energy and reduces harmonic wave pollution.There are two parts in energy feedback system, including boost and inverter. With boost circuit, DC/DC converter is used to boost voltage to meet the requirements of inverter. Then DC voltage is inverted to AC voltage in inversion circuit.The paper analyzes the principle of BOOST transform circuit and several methods of control. On the base of the principle, DC/DC boost converter is designed. This converter realizes constant voltage by closed-loop control and PI adjusting.The paper designs single-phase full-bridge inverter by analyzing the principle of voltage inverter and the method of current control. Locking signal is sampled in a new method witch is different from the traditional method. The reference sine wave is generated by software. Hysteresis control is used to control current. The output current of inverter trace reference sine wave and keeps the same frequency and same phase with power network voltage. This paper simulates the system by using PSIM. And simulation results comport with theory results.At the end of this paper, the experiment results show that the system can obtain well output current following performance. The system realizes the function that DC energy can be fed back to AC power network.