【作者】 李勇；

【导师】 秦娟英； 王攀；

【作者基本信息】 武汉理工大学 ， 电力电子与电力传动， 2007， 硕士

【摘要】 多模块并联实现大容量电源被公认为是当今电源变换技术发展的重要方向之一。多个电源模块并联分担负载功率，使各个模块中主开关器件的电流应力大大减少，可提高逆变电源可靠性、降低成本和提高功率密度，并可以灵活构成各种功率容量。本文以实际的科研项目为背景，在深入细致的研究国内外逆变电源并联控制理论和技术的基础上，设计了一种以软开关技术和高性能控制器DSP(DigitalSignal Processing)为核心的逆变电源并联控制系统。文章首先分析了逆变电源并联的控制原理和数学模型，并在此基础上，研究了逆变电源并联的均流控制方法、并联控制策略和环流的特性，设计了一种可靠抑制环流的方法；针对传统工频变压器的缺点，分析了几种典型的直流变换模式，采用了先升压、再逆变的两级控制模式；设计了软开关电流控制的半桥隔离升压电路。本文结合正弦波调制控制(SPWM, Sine Pulse Width Modulation)理论和高性能的数字信号处理器DSP(TMS320F2812)，设计了以DSP为硬件平台，以单极性倍频正弦脉宽调制(SPWM)、瞬时值电压闭环反馈和分段数字PI(ProportionIntegral)调节的综合控制策略，完成DC／AC(Direct Current／Alternating Current)功率变换，克服了模拟PI调节电路复杂和调试比较困难的缺点；为了提高产品的可靠性，系统设置了软硬件双重限流保护环节；详细分析了同步锁相原理，设计了内同步和外同步相结合的无主从和无同步控制线的同步控制策略，有效地解决逆变模块之间以及逆变电源和市电之间相位同步控制问题。本文结合产品实际，设计了以DSP和CAN(Controller Area Network)总线为技术平台的均流控制方案和以UC3842芯片为硬件基础的系统辅助电源，并就电磁兼容性设计对可并联逆变电源性能和稳定影响进行了阐述。更多还原

【Abstract】 Power converter modules working in parallel state is a new way to expand supply system capacity and it is one of the vital regions in power electronics. Each parallel module takes its share of the load, so the current stress for power switch reduced greatly. Higher reliablility, lower cost and higher power density can be achieved by this way for large capacity power system and also system configuration becomes more flexible.On the basis of deep analysis of parallel operation theories and technology, a parallel operation analysis of parallel system about modular inverter is designed for engineering practical project application. Soft switch technology and DSP (Digital Signal Processor) will be adopted in this system especially.First, the paper analyzes the principle of parallel inverter system and develops mathematical models about it. Based on it after several modes are proposed including sharing current control, parallel control strategy and characters of loop-current, a reliable solution of restraining loop-current is designed. As to some disadvantage of traditional transformer of city frenquency and some typical DC/DC (Direct Current/Direct Current) mode, two phase control pattern of DC/DC and DC/AC is adopted. In the dissertation DC/DC circuit of half bridge has some characters of soft switch and current loop measure.Integrated control strategy, which combines the control theory of SPWM and high-powered DSP, is designed including single polarity double frenquency SPWM, close loop of instantaneous voltage, and intelligent PI adjuster in order to accomplish DC/AC conversion. On the second thoughts it avoids some shortcoming of complicated analog PI adjuster. In the system we set up double safeguard of soft programme and hardware to advance the dependability of the inverters. Afer the theory of tracking phase is analyzed, this control style, in which there are no fixed master-slave modules and no synchronal signal wire, makes those parallel inverters of system synchronal well, and synchronizes the inverters and the city electricity.A novel parallel operation system based on CAN and DSP, which is used by load sharing and synchronization controlling, is proposed in this dissertation. Auxiliary power source is designed in the chip of UC3846. This dissertation also works into EMC in relation to the design of a real system.更多还原