Design And Development Of Sine Wave Inverter System Based On Fuzzy Control Algorithm

With the rapid development of economy and technology, global energy consumption sustained increase, the energy crisis and environmental pollution problems have become increasingly serious. In all kinds of sustainable new energy sources, solar energy has become one of the most popular for its advantage of clean, easy to get and huge energy. As the core component of solar energy utilization, inverter is a device to convert DC input to AC output. Because of the characteristic of feature-rich, flexible control, easy to carry and low cost, the inverter has broad research and application space.This paper first introduces the development situation and development trend of domestic and foreign power inverter system, then proposed system design requirements on the basic of full knowledge of the off-grid sine wave inverter working principle.Secondly, the main circuit of the inverter power system has been designed, in which the DC-DC conversion using the half-bridge push-pull configuration and the DC-AC inverter with full bridge structure. Furthermore, this paper carried specific circuit designs and component selection, including the push-pull converter circuit design, the pulse width modulation circuit design, high frequency transformer design, input rectifier filter circuit design, feedback circuit design, full-bridge inverter circuit design, drive circuit design, LC filter circuit design, sampling circuit design and protection circuit design.Thirdly, this paper made a detailed analysis and discussion about the SPWM control technology and the SPWM sampling method commonly used, adopted unipolar bilateral control and symmetry regular sampling method as the SPWM implementation. Meanwhile, the paper made a detailed study and simulation on the fuzzy control algorithm, including a number of modules, such as fuzzy processing, membership function, fuzzy reasoning and fuzzy rule set, output variables clarity and fuzzy decision. In addition, the control effects of the classical PID control algorithm and the fuzzy control algorithm have been simulated and compared.Finally, based on the STM32F103ZET6 chip, this paper achieve the high frequency complementary SPWM output and the small power inverter power system of fuzzy control algorithm. the former has achieved better control effect, reaching the inverter system desi gn requirements expected. Compared to the classic PID control algorithm, the former gained a better control effect and achieved the desired design requirements of the inverter system.