Inverter Current research and development at home and abroad

Inverter, rectifier means flyback converter, its role is by opening a semiconductor power switching devices on and off action, the DC can be converted into an AC power of power electronic converters. Inverter applications will become increasingly important. The 21st century is energy development, resource utilization and environmental protection co-ordination century of development, optimize the use of energy and the development of clean energy is an important part of the energy resources and environmental strategies for sustainable development.
Oil, gas and coal and other fossil fuels, known as the world's three major energy will gradually be depleted, hydrogen and renewable energy will gradually replace fossil fuels and become the subject of energy for human use, the changes will force this energy generates electricity generation high efficiency and low fuel cell power generation a big change, the use of hydrogen and renewable energy, will become the main power generation. Therefore, the 5000w pure sine wave inverter technology in the field of development and utilization of new energy has a crucial position.
SPWM (Sinusoida-PWM) sinusoidal pulse width modulation sine wave modulation, the carrier is a triangular wave or a sawtooth pulse width modulation method, which is 1964 by A.Schonung and H. Stemmler the communication system modulation technique applied to the inverter generated, because of the slow speed of the switching device without timely promotion, until then equal to the Bristol University SRBowers 1975 SPWM technology only then formally applied to the inverter technology the performance of the inverter is greatly improved, and has been widely used and development, but also to sine wave inverter technology has reached a new height. Features of this technology is simple in principle, versatility, control and regulation performance, with the elimination of harmonics, regulate and stabilize the output voltage of a variety of roles, it is a good waveform Improvement Act. Since then, a variety of PWM techniques have emerged, such as third harmonic injection PWM, space vector modulation, current hysteresis PWM, etc., become the high-speed switching devices of the inverter dominant control. So far, the development of a 48v to 220v power inverter technology has been basically perfect.
In the sine wave inverter control method, at home and abroad there are more studies than PID control, deadbeat control, bicyclic feedback control, repetitive control, variable structure control, fuzzy control and neural network control. PID control is a conventional control method, because of its simple algorithm mature design process overly dependent on system parameters, robustness and high reliability, in simulated sine wave inverter control system has been widely used. With the development of microprocessor technology, with faster static and dynamic response characteristics of the digital PID algorithm also has been used.