本文選題：直流漏電流　切入點(diǎn)：磁感應(yīng)互感器　出處：《華北電力大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：電力系統(tǒng)中直流供電系統(tǒng)是一個(gè)復(fù)雜且縱深程度高的系統(tǒng),測(cè)量直流漏電流對(duì)于保障電力系統(tǒng)正常運(yùn)行具有重大意義。磁調(diào)制互感器在電力系統(tǒng)中被廣泛用于測(cè)量直流漏電流,然而傳統(tǒng)的磁調(diào)制互感器算法在測(cè)量直流漏電流時(shí)并不十分適用。目前針對(duì)直流漏電流的測(cè)量算法研究較少,且針對(duì)溫度對(duì)于互感器的影響研究較少。本文針對(duì)傳統(tǒng)磁調(diào)制互感器算法進(jìn)行改進(jìn),使其適用于測(cè)量直流漏電流,并且設(shè)計(jì)出一款使用改進(jìn)算法的互感器系統(tǒng)。針對(duì)磁芯進(jìn)行了ANSYS溫度場(chǎng)建模,更好的了解溫度對(duì)互感器的影響,并且針對(duì)這種影響提出了補(bǔ)償方法。本課題的開展,能夠彌補(bǔ)現(xiàn)有研究的不足,提高現(xiàn)有的直流漏電流測(cè)量水平。本文對(duì)國(guó)內(nèi)外與本課題相關(guān)的研究成果進(jìn)行分析,對(duì)現(xiàn)有的測(cè)量直流漏電流的方法進(jìn)行總結(jié),對(duì)測(cè)量直流漏電流與現(xiàn)有的相關(guān)研究成果進(jìn)行深入研究,提出合理的測(cè)量方法,設(shè)計(jì)出基于FPGA的直流小電流互感器�；ジ衅鞣譃橛布O(shè)計(jì)和軟件設(shè)計(jì)兩個(gè)方面。硬件設(shè)計(jì)為軟件設(shè)計(jì)提供了平臺(tái),針對(duì)直流漏電流采用差分算法,并且采用雙線圈進(jìn)行測(cè)量,更好的提高了精度。而且由于FPGA所擁有的大量的IO資源,為日后的多路互感器的擴(kuò)展提供了可能。軟件部分使用了FPGA的內(nèi)核開發(fā),擁有串口輸出和DA電壓輸出兩種輸出方式,使得互感器的輸出更加直觀。通過實(shí)驗(yàn)數(shù)據(jù)證明本文所設(shè)計(jì)的互感器測(cè)量精度滿足電網(wǎng)中對(duì)于檢測(cè)的要求。最后為解決磁芯受溫度影響的問題,本文針對(duì)磁芯的溫度場(chǎng)建立了ANSYS模型,在同等條件下觀察溫度與磁芯磁導(dǎo)率的關(guān)系。在確定了溫度與磁芯磁導(dǎo)率的關(guān)系之后,針對(duì)當(dāng)前時(shí)刻待測(cè)電流的不同,觀察不同的待測(cè)電流與磁芯磁導(dǎo)率的關(guān)系,針對(duì)這兩種對(duì)磁芯磁導(dǎo)率的影響源提出相對(duì)應(yīng)的補(bǔ)償策略。
[Abstract]:DC power supply system in power system is a complex and high depth system. It is very important to measure DC leakage current to ensure the normal operation of power system. Magnetic modulation transformer is widely used to measure DC leakage current in power system. However, the traditional magnetic modulation transformer algorithm is not very suitable for measuring DC leakage current. There is little research on the effect of temperature on transformer. In this paper, the traditional magnetic modulation transformer algorithm is improved to make it suitable for measuring DC leakage current. And designed a transformer system using the improved algorithm. The ANSYS temperature field modeling for the core, a better understanding of the impact of temperature on the transformer, and proposed a compensation method for this impact. It can make up for the deficiency of the existing research and improve the current level of DC leakage current measurement. This paper analyzes the research results related to this topic at home and abroad, and summarizes the existing methods of measuring DC leakage current. The measurement of DC leakage current and existing related research results are deeply studied, and a reasonable measurement method is put forward. A DC small current transformer based on FPGA is designed. The transformer is divided into two aspects: hardware design and software design. Hardware design provides a platform for software design. Because the FPGA has a lot of IO resources, it is possible to expand the multiplex transformer in the future. The software part uses the kernel of FPGA, and has two output modes: serial port output and DA voltage output. Through the experimental data, it is proved that the measuring accuracy of the transformer designed in this paper meets the requirements of the detection in the power network. Finally, in order to solve the problem that the core is affected by the temperature, the output of the transformer is more intuitionistic. In this paper, the ANSYS model is established for the temperature field of magnetic core, and the relationship between temperature and permeability is observed under the same conditions. After determining the relationship between temperature and permeability of magnetic core, the difference of current to be measured at present is discussed. The relationship between different measured current and magnetic core permeability is observed, and the corresponding compensation strategies are put forward for the two kinds of influence sources of magnetic core permeability.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM45

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