电能质量监测及无功补偿技术研究
发布时间：2018-11-08 08:36
【摘要】：电力系统供电电能质量对我国经济的发展和人们生活水平的提高有着重大的影响。良好的电能质量有利于电气设备的正常运行,保障了科学实验和工业生产的正常进行,有效的降低了能源的消耗。 本文首先简要地介绍了电能质量的相关概念及国家标准。接着,深入地研究了电能质量检测及无功补偿技术的软硬件实现。在硬件方面,采用NXP公司的LPC2136作为主控芯片,通过运算放大器搭建出信号调理电路,将电网的大电压和大电流变换成芯片能够采集的电压信号,将调理好的信号接入芯片的A/D采样口进行采样,并且设计出继电器驱动电路,根据检测到的电能参数适时地进行无功补偿控制。利用Saber软件对设计好的电路进行仿真,仿真分析成功后搭建实际的电路进行测试,并最终制出PCB板。在软件方面,通过改进的快速FFT算法进行谐波分析,进而得出稳态情况下电网的运行参数。根据检测的系统参数,同时运用改进的九域算法作为无功补偿的控制策略进行继电器的投切。 最后,通过信号发生器给定一个信号,分析检测出的电能参数与所给定值之间的偏差。通过多组实验数据分析,该系统能够比较准确的测出给定信号中的电压偏差、频率偏差、谐波含量、功率因数等表征电能质量的相关参数。高精度的检测为提高电能质量提供了可靠的依据。
[Abstract]:The quality of power supply in power system has great influence on the development of economy and the improvement of people's living standard. Good power quality is conducive to the normal operation of electrical equipment, ensuring the normal conduct of scientific experiments and industrial production, and effectively reducing the consumption of energy. In this paper, the concept and national standard of power quality are introduced briefly. Then, the hardware and software realization of power quality detection and reactive power compensation are studied. In the aspect of hardware, the LPC2136 of NXP Company is used as the main control chip, and the signal conditioning circuit is built by the operational amplifier. The large voltage and current of the power grid are converted into the voltage signals which can be collected by the chip. The adjusted signal is connected to the Ar / D sampling port of the chip and the relay drive circuit is designed to control reactive power compensation timely according to the detected power parameters. Saber software is used to simulate the designed circuit. After the simulation and analysis, the actual circuit is built and tested, and finally the PCB board is produced. In the aspect of software, the harmonic analysis is carried out by the improved fast FFT algorithm, and then the operation parameters of the power network under steady state are obtained. According to the system parameters, the improved nine-domain algorithm is used as the reactive power compensation control strategy to switch the relay. Finally, the deviation between the detected electric energy parameters and the given values is analyzed by using the signal generator to give a signal. The system can accurately measure the voltage deviation, frequency deviation, harmonic content, power factor and other related parameters of power quality in a given signal through the analysis of multiple sets of experimental data. The high-precision detection provides a reliable basis for improving the power quality.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM761.12
本文编号：2317942
[Abstract]:The quality of power supply in power system has great influence on the development of economy and the improvement of people's living standard. Good power quality is conducive to the normal operation of electrical equipment, ensuring the normal conduct of scientific experiments and industrial production, and effectively reducing the consumption of energy. In this paper, the concept and national standard of power quality are introduced briefly. Then, the hardware and software realization of power quality detection and reactive power compensation are studied. In the aspect of hardware, the LPC2136 of NXP Company is used as the main control chip, and the signal conditioning circuit is built by the operational amplifier. The large voltage and current of the power grid are converted into the voltage signals which can be collected by the chip. The adjusted signal is connected to the Ar / D sampling port of the chip and the relay drive circuit is designed to control reactive power compensation timely according to the detected power parameters. Saber software is used to simulate the designed circuit. After the simulation and analysis, the actual circuit is built and tested, and finally the PCB board is produced. In the aspect of software, the harmonic analysis is carried out by the improved fast FFT algorithm, and then the operation parameters of the power network under steady state are obtained. According to the system parameters, the improved nine-domain algorithm is used as the reactive power compensation control strategy to switch the relay. Finally, the deviation between the detected electric energy parameters and the given values is analyzed by using the signal generator to give a signal. The system can accurately measure the voltage deviation, frequency deviation, harmonic content, power factor and other related parameters of power quality in a given signal through the analysis of multiple sets of experimental data. The high-precision detection provides a reliable basis for improving the power quality.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM761.12
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