Research On Single-phase Voltage Source Inverter Developed And Parallel Control Technology

In recent years,with the national industrial development and technological advances,various industries have a higher demand for electricity supply. In addition, energy strategy study in our country was included in the "Twelfth Five Year Plan".In this backdrop, it has become one of the key energy research in the field to provide a stable, high reliability, high efficiency, energy saving power supplyAt recent, the research of solar photovoltaic energy becomes more and more attention, and the inverter is an important carrier of solar photovoltaic. It has become a consensus to study how the inverter efficiently and stable converse electrical energy.Inverter technology is developing rapidly both at home and abroad, and it needs to use the inverter on more occasions. For example:the use of the inverter in the aviation and maritime use, wind power, the use of uninterruptible power systems (UPS), the use of solar photovoltaic and new energy in the electric car use. Throughout the development of the inverter, it can be found that the inverter has improved the output voltage waveform-based multiple superposition method and reduced efficient output of sine wave study of which was the traditional low-speed switch-based and non-digital control. The inverter use high-speed switching which is key,digital control,high efficiency, multi-PWM technology to improve the output waveform with progressive development. At precent they are becoming the trend of the inverter study, like high frequency PWM soft-switching technology, multi-level overlay technology, high power and good harmonic suppression technology, frequency conversion technology, inverter grid power supply technology.Single-phase voltage-source inverter is researched. First,this paper describes the research background,the analysis of the history and current status of the inverter, the main content and organization of work, second,it introduces the classification of the inverter, studies the work of single-phase voltage source inverter, builds the corresponding mathematical model for the analysis, and improves the inverter waveform output and harmonic suppression and suppresses harmonic components by optimal control methods and the use of prediction methods. Then it studied multiple inverters in parallel on the basis of a single inverter, introduces the main control method of inverter parallel, establishes the mathematical model of the inverter in parallel, discussed the basic problems of the inverter in parallel and gives solutions, In the programs of distributed parallel,it designed and improved the control methods and came out the parallel inverter. Finally, the hardware designed development of a prototype inverter. To the ARM chip STM32F103VE for the main chip, the two parts of the design of the inverter are as follows: the main control board and power board. The design work includes the selection of the various components and circuit design to achieve the sine wave output. This article completed the following work:Firstly the analysis and research of single-phase voltage source inverterRrelevant literature and technical information to determine the design of single-phase voltage source inverter are researched, selected the control of current and voltage closed-loop for a single inverter; used STM32F103VE chips digital SPWM to control wave output waveform,On the basis of which, used the method based on forward and backward to improve the waveform and harmonic suppression. It improved the inverter parallel by analysis of the basic problems,using the distributed inverter parallel control scheme, current share bus, the PQ method of adjustment, real-time feedback and the predicted methods.Secondly the design and development of single-phase voltage source inverter hardware systemThe hardware system includes a main control board and power board. Main control board according to the characteristics of ARM chip STM32F103VE, designs the peripheral circuits and the corresponding interface.These peripheral circuits and interfaces: switch driver circuit, the ADC sampling circuit of SPWM wave generation processing circuit, LCD liquid crystal interface, RS232communication interface, CAN bus communication interface and PWM circuit and so on. The power board consists of DC/DC boost circuit and DC/AC inverter bridge circuit. Finally, it designed schematic and draw PCB board and welded components by using the Altium Designer software, which can be used to test and use.By separating the power section and control section in order to achieve the stability of the system, efficient and safe. System based on digital control, making the system more convenient and reliable control and adjustment.Thirdly Preparation of single-phase voltage source inverter system control programPrepared according to the system control requirements, as well as the ARM the chip STM32F103VE program rules. Design and preparation of single-phase inverter system to run the program code, the program contains the main program, interrupt handlers and exception handler etc.To sum up:the single-phase voltage source inverter system with many advantages such as reasonable design, fast response, high reliability, high efficiency and so on, has great practical value.