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微机继电保护测试仪的多目标控制电流放大系统的研究
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摘要
继电保护测试仪在经历了国内十几年时间的发展,已经完全实现了在国内市场的绝对占有率,在软硬件水平上,已经完全可以与国外同类设备相媲美。随着科技的发展,倡导“绿色科技”已成为科技发展的主题,利用开关电源和开关功放来代替线性电源和线性功放来组成继电保护测试仪的工作电路已成为不可替代的研究发展方向。
     本文在深入研究大量国内外文献后,对“开关电源+开关功放”工作模式的继电保护测试仪及其数字控制技术进行了系统的研究。通过长时间的研究,最终确定了采用在双极性SPWM控制和PI调节的基础上加以多目标控制的控制策略。并详细阐述了新提出的专用于中低功率的开关功率放大器领域内的多目标控制技术的工作原理。
     根据理论的研究与实际应用的具体要求,本文设计了基于DSP芯片TMS320F2808处理器的电流型开关功率放大器的实验平台,并完成了主电路、控制电路以及其余各部分电路的设计思路,为控制方案的实现提供了实际硬件基础。同时完成了程序的设计,和硬件系统的搭建,并在实验平台上完成了系统软件和硬件的调试。测得系统在得到不同的输入信号时的输出波形,验证了采用本文设计的控制策略的电流型开关功率放大器可以得到正确稳定的电流输出。
By the development in decades in China, the original relay protection testing instrument, which has the same hardware and software level, has occupied the Chinese market. As the development of technology, the“Green Tech”has become the theme of the technology development. It is ineluctable that using switch power supply and switch amplifier to take place of linear power supply and linear amplifier as the circuit of the relay protection testing instrument.
     After a deep research of a mass of China and foreign papers, this passage had finished a systemic research of the relay protection testing instrument worked on“switch power supply and switch amplifier”work-mode and the digital control system. Finally, through a long-term research, we had decided to use a method called the multi-target control which is based on the ambipolar SPWM control and the PI adjustment. And the passage illuminated the working principle of the multi-target control tech clearly which is used in the area of low and medium power switch amplifier.
     According to the requirements of the theory research and the actual application, this passage designed the current-mode switch power amplifier experiment platform which is based on the DSP chip TMS320F2808 processor. By finishing the designs of the main circuit, the control circuit and other circuits, it supplied a hardware basis to achieving the control strategy.
     At the same time, we finished the design of the software and the construction of hardware, and finish the debug of the software and hardware. By measured the output wave-forms of the different input signals, we verified that the current-mode switch power amplifier based on the control strategy this passage provided can get a correct and stable current output.
引文
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