【作者】 陶小鹏；

【导师】 夏泽中；

【作者基本信息】 武汉理工大学 ， 电力电子与电力传动， 2010， 硕士

【摘要】 随着我国经济的不断发展,对能源需求越来越大,石油的运输、存储量越来越大,管道、油轮、油库的防腐问题越来越受到人们的重视。阴极保护被广泛用来减缓或阻止埋地管道和铁质材料的电化学腐蚀。传统的阴极保护电源主变压器工作在工频50Hz或60Hz,使得变压器体积庞大、笨重,为了克服传统阴极保护电源功率因数低、效率低、可靠性差等缺点,本文将大功率开关电源技术引入到外加电源的阴极保护领域,研制出高频开关阴极保护电源。本文首先论述了大功率开关电源软开关技术,针对全桥移相零电压变换器(FB-ZVS-PWM变换器)存在的一些缺点,例如占空比丢失,以及损耗较大的情况,本设计主电路采用移相全桥零电压零电流开关PWM变换器(FB-ZVZCS-PWM变换器),实现了功率管的软开关,超前臂实现零电压开关,滞后臂实现零电流开关,并对其基本工作原理进行了阐述,同时给出了一些实现滞后臂ZCS的策略。其次,对高频开关型阴极保护电源进行了详细的硬件设计,包括高频变压器设计、控制电路中信号检测调理电路和IGBT驱动电路设计、外部ADC设计、以及。控制电路以Microchip公司的dsPIC30F2020为核心,脉宽调制信号由DSC产生,还介绍了ADC模块子程序、PI子程序、移相角生成子程序,实现了阴极保护电源设计的数字化。实验结果表明,将全桥DC/DC技术应用于专用的高频开关型阴极保护电源电源本模块化电位仪将适用于各种地下金属结构外加电流的阴极保护,克服了传统阴极保护电源存在的缺点,本设计的电源控制系统控制精度高、抗干扰能力强、人机对话和操作方便,能满足要求。更多还原

【Abstract】 With the continuous development of our economy, increasing demand for energy, oil, transport, storage capacity increases, pipeline, tanker, tank corrosion protection has received increasing attention. Cathodic protection is widely used to slow or prevent corrsion of the steel materials underground and buried pipeline. As a rectifier for cathodic protection, the conventional phase-controlled rectifier with 50-or 60-Hz isolation transforms have been used so far in spite of such shortcomings as large volume, heavy weight, and poor power factor. In order to overcome such disadvantages, this article applies high-power switching power supply technology to the field of cathodic protection, and develops a high frequency switching power supply cathodic protection.Firstly, this thesis discusses the high-power switching power supply soft switch technology, for the full bridge phase-shifted zero-voltage converter (FB-ZVS-PWM converter) some disadvantages, such as the duty cycle loss, and loss of the larger situation. The main circuit uses Phase-Shifted Full Bridge Zero-Voltage Zero-Current Switching PWM Converter (FB-ZVZCS-PWM converter), to achieve soft switching of power control, ultra-forearm to achieve zero voltage switching, zero-current switching delay arm, and its basic working principle has been described at the same time. This paper also gives some strategies to achieve ZCS lagging arm.Secondly, this thesis designs the hardware of the FB-ZVZCS-PWM converter in detail, including the design of the high-frequency transformer, inductances, capacitors, control circuit, drive circuit of IGBT and A/D. It also designs the software. In order to obtain accurate and real-time control, high performance digital signal controller dsPIC30F2020 is adopted for control core. And the voltage feedback PI algorithm is used to adjust the output voltage and current character of power source.Finally, this thesis builds the experimental platform of energy storage system according to the design requirements.Experimental results show:high power DC-DC converter is suit for cathodic protection. This paper also shows that the control system has many advantages such as high control precision, man-machine conversation and reliable performance.更多还原