Design Of Power Control System For Electric-heating Converter And Inverter Technology Research

With the continuous progress of new energy generation technology in China,the proportion of wind turbines in the total capacity of wind turbines in China is increasing year by year,and the problem of wind farms abandoning wind power is becoming increasingly serious.How to effectively absorb wind power and make rational use of wind power resources has become a major challenge for the development of new energy wind power technology in China;At the same time,with the continuous development of industry and the continuous expansion of urban area,air pollution has become a problem that we must face and solve,especially in the winter heating period of northern China,the use of a large number of traditional coal-fired heating equipment has caused great pollution to the environment,which is the background of electromagnetic induction heating technology as the core of electric heat exchange energy storage system,with its advantages of clean and efficient,high electric heat conversion rate,fast heating speed,has become an important engineering equipment to absorb wind power and reduce environmental pollution.In this treatise,the design and important technical issues of electric-heating converter are studied as follows:First of all,the basic principle and influencing factors of induction heating are introduced.Aiming at the main purpose of the electric-heating converter,the power grid system structure diagram of the electric-heating converter applied to wind power absorption and power supply is designed,and the heat storage system engineering design scheme of the electric-heating converter is formulated.According to the working environment and requirements of the electric-heating converter,the main circuit structure is designed and its circuit characteristics are analyzed in detail Detailed analysis.Secondly,in the practical application of the electric-heating converter,the topology structure and working process of the two inverters with parallel-capacity-double and time-sharing frequency-double were analyzed,and detailed theoretical analysis and formula derivation for the capacity expansion and powerloss of the two inverters were analyzed too;analysis and comparison of different modulation control methods of the inverter,establishing the superiority of the phase-shift control for the design requirements of this article;a frequency-double inverter circuit is design based on the phase-shift and time-sharing and introduce the specific working state of the inverter circuit at each time in detail;Matlab / Simulink and Infineon official IPOSIM simulation software are used to simulate the above circuits,and the operating characteristic curve of inverter load circuit is obtained.In addition,on the basis of analysis and research,the parameter calculation and device selection of 100kW/16 kHz electric-heating converter are carried out;and according to the designed control system,the hardware circuit based on STM32F107VCT6 single chip microcomputer is designed,mainly including power circuit,water level and inlet and outlet water temperature monitoring circuit,protection circuit,driving vertical plate,frequency tracking and Phase locked circuit and through Multisim simulation software for experimental verification.Finally,according to the calculation of the device selection,the design of the hardware circuit and the structural diagram of the heating tube,the experimental prototype of the electric-heating converter is manufactured,and the equipment test of the electric-heating converter is carried out.The working characteristic curve is obtained,which proves the accuracy of the design scheme.