本文選題：智能變電站　切入點：二次設備　出處：《電子科技大學》2014年碩士論文

【摘要】：智能變電站中前移至一次設備近旁的二次設備將遭受更為嚴酷的電磁干擾環(huán)境,可能導致二次設備損壞,也可能因此造成保護設備誤動作或不動作。掌握變電站的電磁環(huán)境,分析變電站電磁干擾的特征對抑制電磁干擾、保護二次設備和保護裝置穩(wěn)定運行具有重要的意義�，F(xiàn)場測量的方法是研究變電站電磁環(huán)境的一種重要的手段。目前,變電站瞬態(tài)電磁干擾的測量系統(tǒng)并不常見,且在使用上具有較明顯的局限性,因此,本文研制了一臺適用于變電站瞬態(tài)磁場環(huán)境測量、記錄及分析的手持式設備。該設備由磁場測量探頭和記錄儀主機兩部分組成。磁場測量探頭采用了基于AMR效應的磁阻傳感器,而記錄儀主機采用了基于FPGA+ARM+ARM的系統(tǒng)架構。論文先后完成了磁場采集模擬前端,數(shù)據(jù)中繼引擎,人機交互單元,數(shù)據(jù)存儲單元以及電源系統(tǒng)等電路的設計,其中,磁場采集模擬前端重點研究了交流通道和放大電路的設計方法,從理論上推導了增益分配對于輸出信噪比的影響,數(shù)據(jù)中繼引擎重點研究了FPGA與DDR2接口電路的設計方法,并通過仿真驗證了設計的正確性。記錄儀最終實現(xiàn)了磁場波形顯示、大容量數(shù)據(jù)存儲、離線分析、GPS時標、USB讀卡器以及人機交互等功能。記錄儀安裝簡單,維護方便,體型輕巧,便于攜帶,適合戶外長時間工作。實驗室工頻磁場試驗和脈沖磁場試驗分別測試了記錄儀工頻磁場測試性能和瞬態(tài)磁場的捕獲性能。試驗結果說明記錄儀能夠對變電站正常運行時的穩(wěn)態(tài)磁場環(huán)境以及變電站開關操作或系統(tǒng)故障等暫態(tài)過程時的瞬態(tài)磁場環(huán)境進行有效的測量。對錦屏-蘇南±800kV換流站內(nèi)部包括母線下方、交流濾波器場、GIS室、閥廳等在內(nèi)的十余處位置進行的實地測量的結果表明,35KV低壓電抗器附近磁場強度最大,峰峰值達到6Gs,而極I高端換流器出線口磁場頻譜分量最豐富,FFT分析結果表明最高頻率分量達到893.6kHz。
[Abstract]:The secondary equipment moving forward to the front of the primary equipment in the intelligent substation will be subjected to more severe electromagnetic interference environment, which may lead to the damage of the secondary equipment, as well as the maloperation or non-operation of the protective equipment.It is of great significance to master the electromagnetic environment of substation and analyze the characteristics of electromagnetic interference in substation to restrain electromagnetic interference and to protect secondary equipment and protective device from running stably.The method of field measurement is an important method to study the electromagnetic environment of substation.At present, the measurement system of transient electromagnetic interference in substation is not common and has obvious limitation in application. Therefore, a hand-held device is developed for the measurement, recording and analysis of transient magnetic field environment in substation.The equipment consists of a magnetic field probe and a recorder.The magnetoresistive sensor based on AMR effect is used in the magnetic field measurement probe, and the system architecture based on FPGA ARM ARM is used in the main computer of the recorder.The paper has completed the design of magnetic field acquisition and simulation front end, data relay engine, human-computer interaction unit, data storage unit and power supply system.The design method of AC channel and amplifier circuit is studied in the field acquisition simulation front end. The effect of gain allocation on output signal-to-noise ratio is deduced theoretically. The data relay engine focuses on the design method of interface circuit between FPGA and DDR2.The correctness of the design is verified by simulation.Finally, the recorder realizes the functions of magnetic field waveform display, large capacity data storage, off-line analysis of GPS timescale, USB card reader and man-machine interaction.The recorder is easy to install, easy to maintain, light and portable, suitable for long hours.The power frequency magnetic field test and the pulse magnetic field test in the laboratory are used to test the measuring performance of the power frequency magnetic field of the recorder and the capture performance of the transient magnetic field, respectively.The test results show that the recorder can effectively measure the steady-state magnetic field environment during the normal operation of the substation and the transient magnetic field environment during the transient process such as switching operation or system fault in the substation.The field measurements of more than ten locations in the inner part of the Jinping 鹵Sunan 鹵800kV converter station, including the bus, the AC filter field, the valve hall, etc., show that the magnetic field intensity near the 35 KV low-voltage reactor is the largest.The peak value reaches 6Gs, while the frequency spectrum of the output line of the pole I converter is the most abundant. The result of FFT analysis shows that the highest frequency component is 893.6kHz.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM63;TM937

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本文編號：1712549