Based On Solar Photovoltaic Power Generation Flywheel Energy Storage System

With China's rapid economic development, energy shortage is getting worse. For China's energy shortage, there are two ways. First, find the resources to increase foreign imports. The second is the development of new energy sources, particularly renewable energy. The fundamental method to solve the problem is the second. Solar photovoltaic technology which has been more mature, has formally applied to production practice. The operating characteristics of the sun, solar energy photovoltaic power generation device output is uneven, but also in the energy conversion process could also lose a lot of energy, so the use of solar photovoltaic technology is the difficulty of energy storage. Most of the indicators of domestic and international energy storage technology can not meet the requirements of the new storage technology is imminent. The flying of energy storage technology is currently one of the more mature technologies.Flywheel energy storage(FES)is all advantageous type of late—model energy storage technology, which can be got from solar energy, wind energy and excess electrical energy of power network as the supplementary energy source. The system is high efficient, secure, green and economic. As a pure electro mechanical storage system, it has advantage of high specific energy and specific power, non-pollution, long cycle life, has a great development in a short time. At present, FES technology has been success fully applied in many fields, such as aerospace, uninterruptible power supply (UPS) systems, power systems, hybrid electric vehicles, etc.This paper designed the economical topology of FES system, mainly researched the motor and generator control of permanent magnetic brushless DC motor. This paper proposed a solution of motor and generator controlling system based on the TMS 320F2812 DSP chip, and particularly introduced about the design of hardware and software of controlling system. The model of the FES system on charge and discharge was built by MATLAB, and the course of charge and discharge was simulated. In charge section, electrical energy is converted into mechanical energy by flywheel which is motivated by brushless DC motor(BLDCM). In order to reduce start-up current and torque ripple, the whole system combines pulse amplitude modulation(PAM)control method with pulse width modulation(PWM) control mode of three phases inverter circuit. At the same time, In order to obtain a FES control system of high performance, a dual closed—loop full-digital control system is designed using speed and current as control objects. In discharge section, FESS can be converted mechanical energy into electrical energy and a boost converter is introduced to stabilize the bus voltage value about 310V then the DC bus voltage is inverted to 220 VAC by an inverter circuit which is applied with SPWM method. The simulation results show that the system is reasonable and reliable. In a word, this research implemented the expected ideal and laid a good foundation for the next stages of product development.