【作者】 李哲；

【导师】 汤天浩；

【作者基本信息】 上海海事大学 ， 电力电子及电力传动， 2004， 硕士

【摘要】 发电厂、变电所中，控制部分和保护部分需要安全可靠的供电电源，由蓄电池组构成的高频开关直流电源因其高可靠性成为电力操作电源系统中的重要组成部分。 本文分析了国内外高频开关电源的发展和现状，研究了高频开关电源的基本原理以及高频开关电源在电力直流操作电源系中的应用，设计出一种实用于电力系统的高频开关电源，以替代传统的相控电源。该系统以IGBT作为功率开关器件，构成全桥开关变换器，整个电源由输入电路、功率因数校正器、主逆变器、输出滤波电路、辅助电源、均流电路等部分组成。系统主电路逆变部分采用了脉宽调制技术(PWM)，PWM信号由集成控制器UC3825产生，从输出端实时采样电压、电流反馈信号，以控制输出电压和电流的变化。IGBT驱动电路采用单独的集成驱动器M57962L控制器进行驱动。控制电路和主电路之间通过变压器和光电耦合器进行隔离，提高了系统的可靠性和安全性。 本文设计的开关整流模块还具有多种保护措施，如过压、过流、超温等。针对不同的情况分别采取软启动、封锁输出脉冲等不同方式，使得系统的可靠性更高。 各个模块之间通过UC3902实现主从方式负载均流，从而可以方便地实现系统扩容，同时也增加了系统的冗余度。 由于模块工作于高频开关状态，系统具有体积小、重量轻、可靠性高、负载分担容易等一系列优点。更多还原

【Abstract】 In the power plant and transformer substations, the DC operation power is supplied from high frequency switching power supply (HF SPS) and uses bulky batteries as alternative power.The paper analyze the present situation development of high frequency switching power supply domestically and overseas, study and research the basal principle of HF SPS and its application in electric power system, then design HF SPS applied in electric power system in order to replace the old supply controlled by phase angle. The full-bridge converter is made up of four IGBT. The system consists of the AC input stage, main inverter, output low-pass filter, auxiliary power supply, and load current sharing circuit, etc. The theory of PWM is used in the system, and single of PWM is offered by controller UC3825.The feedback voltage and current achieved from output is used to control the change of the output. The controller M57962L is used in the IGBT drive-circuit. The primary circuit and the control circuit are insulated by the transformer and photo-coupler,increasing the reliability of the system.System exceptions, such as over-voltage, over-current, over-temperature, etc, are dealt with by carefully designed protection circuits. These circuits provide various functions to protect the system, including soft start, drive signals mask, etc.By using master-slave load current sharing technique, modules can be parallelized easily, thus capacity-expansion is very convenient.Because of the high frequency operation, this switching mode power supply has many advantages: light weight, small physical size, high reliability, etc.Li Zhe(Power Electronics and Electric Drive) Directed by Tang Tianhao更多还原