Three-phase Inverter System Based On Concept Of Integrated Power Electronics

Inverter is the main technology of electronic power conversion and control. The applications of it are proliferating in many areas of modern society. With the ever-increasing energy demand of the world, inverter will play key role in the new energy resources. However, in power electronics, it is generally believed that advancements can be achieved only through a systems-level approach by developing intelligent, integrated power electronics modules (IPEMs) that initiated in the 1990's. And the novel power electronics integration technology will push the further development of inverter.But, power electronics integration technology in inverter is diffirent with the technology of integrated circuit. Some dominant technology barriers must be solved emergently. In this dissertation, three phase inverter system with the concept of power electronics integration will be the main contents.Key technologies of it, such as numeralization and integration of SVPWM based driving and control system, MATLAB model based design of driving and control system, realization of wide input voltage auxiliary power supply and power electronics integration technology are researched and discussed thoroughly.PWM scheme is widely used in inverters. Firstly, the universal principle of PWM is presented. The mechanism of SPWM widely used in industry is discussed in details, including control mode, analysis of control characteristic and method for computer realization of SPWM(i.e. theoretical derivation and analysis of sampling method. ). In order to obtain high DC bus voltage utilization and numeralization easily, the SVPWM is proposed with detailed theoretical derivation. For high voltage and power applications, the three-phase three-level PWM inverters are widely used. A neutral-point-clamped voltage-source inverter with three-level is presented in this thesis. The SVPWM operation principle and realization of it are discussed in detail. The simulation results validate it.The driving and control system with integration concept is the core of the power electronics integration module intelligence.The TMS320F2812 DSP and IR2136 based driving and control system for three-phase inverter is proposed. IR2136 based driving circuit is simulated with Pspice software. The results provide the laws for other designs. Three SVPWM schemes are presented and the realization principle is analysed. The DC bus voltage utilization, modulation functions and harmonic contents for three different schemes are studied using comparison. According to the feature of three control scheme, two SVPWM realization methods by DSP, i.e. using harware(5-segment SVPWM) and using software(3-segment and 7-segment SVPWM ), are introduced. The experimental results of them are given and the effect to control performance is analysed. In addition, to avoid stated problems, such as document-based specification misunderstanding, coding errors and extend development time of the control algorithms, of traditional manual coding, a MATLAB model based DSP driving and control system is firstly proposed. The DSP code realization procedure of the model based control system is demonstrated through the model based design of a simple PWM control system and the experimental results validate the design. Detailedly, the model based 5-segment SVPWM DSP control system is studied. Also, the simulation and experimental results are given.Wide input voltage converters can be used in all kinds of applications.Thus it can meet the different customers and operate in all power systems.In this dissertation, the flyback converter topology which can be easily integrated is presented.The structure characteristic of it and operation performance of its three modes(CCM,DCM and critical current mode) are introduced at length. The UC2845 based wide input voltage flyback converter is proposed. The design principle of it is analysed through designing feedback loop properly and changing operation mode.The core technologies are stated, which are the design of high frequency transformer, the interference suppression of spike voltage, the slope compensation of current mode controller and the design of stable feedback loop. The prototype with two output and 25W power is assembled. And the experiment is implemented. The results of theory and experiment show that high performance wide input voltage flyback converter can be realized by designing the operation mode and feedback control loop properly.The system structure of inverter and key technologies of power electronics integration can provide us the useful ideas for the new system integration. In this thesis, the system structure of three phase inverter is presented and the experiment is done on this platform. The impact of auxiliary power supply input voltage on operation mode and power devices stress, impact of feedback loop and slope compensation on system performance and impact of control algorithm on system performance are analysed. The probability analysis of power electronics integration is given with the knowledge of microelectronic integrated circuit development. And the core technologis, such as three-dimensional packaging and interconnection, magnetics-integration technologis and integrated design methodology, of power electronics integration for three phase inverter, are overviewed. A novel thermal design method integrated the software OrCAD, Origin and Ansys, is proposed.The work done in the dissertation is only the first step of integration.But it provides the design ideas and good engineering example for inverter system and its integration technology.