本文關鍵詞：電力變壓器數(shù)字化保護裝置的研制　出處：《山東大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 電力系統(tǒng) 變壓器保護 勵磁涌流 傅里葉變換 現(xiàn)場調(diào)試

【摘要】：電力變壓器在電能的輸送過程中充當重要的角色,是不可或缺的一次電氣設備,它的安全與否直接決定著整個電網(wǎng)能否作可靠的工作,因此變壓器保護裝置就顯得非常重要。變壓器保護配置通常由主保護和后備保護共同來實現(xiàn)對變壓器的保護。常見的變壓器故障主要分為內(nèi)部和外部故障；內(nèi)部故障主要有主保護進行處理,而外部故障主要主保護通常有后備保護進行處理,在主保護拒動時后備保護實現(xiàn)動作。本文主要對變壓器的保護原理作深入的研究分析,并設計出基于DSP的數(shù)字式變壓器保護裝置。本文就變壓器主保護及后備保護的工作原理做了詳細介紹,其中包括主保護的差動保護和差動速斷及后備保護的過流及過負荷等。主保護的差動保護會因勵磁涌流的產(chǎn)生而出現(xiàn)誤動作,因此本裝置對出現(xiàn)勵磁涌流的產(chǎn)生及采取的措施作了詳細說明。變壓器在正常運行中會出現(xiàn)不平衡電流,本文就對勵磁涌流與不平衡電流出現(xiàn)的原因及消除措施做了詳細的說明。保護裝置的判據(jù)定值是通過傅里葉變換算法而得到的,為此還具體列出了用24點傅里葉算法求出的基波、二次諧波和三次諧波的值。本文重點在于對保護裝置的硬件和軟件系統(tǒng)的設計,并充分考慮設計了軟硬件的抗干擾措施。裝置的硬件系統(tǒng)采用廣泛應用的插件式結構,保護的各個插件既相互獨立又相輔相成,共同組成了本保護裝置,實現(xiàn)了包括網(wǎng)絡通訊在內(nèi)的所有保護功能。硬件結構是以TI公司高性能的TMS320F2811為主控CPU搭建而成,具體實現(xiàn)了數(shù)據(jù)采集、邏輯輸出、動作記錄、人機交互及網(wǎng)絡通訊等完整的微機保護功能。軟件系統(tǒng)的開發(fā)是在CCS軟件環(huán)境進行的,通過采用主程序與中斷程序結合方式,利用DSP的強大的數(shù)據(jù)處理和控制能力大大提高了工作效率并降低了功耗。DSP片內(nèi)的外設資源豐富,完成了A/D轉換及串口通信等功能,本文就對軟件的程序流程做了詳細的介紹。保護裝置的速度、精度等滿足微機保護的技術要求,為此特意做了包括網(wǎng)絡通訊在內(nèi)的各種現(xiàn)場調(diào)試實驗,對其主要的功能做了實驗進行驗證,并對裝置進行了現(xiàn)場調(diào)試。
[Abstract]:Power transformer plays an important role in the process of power transmission and is an indispensable electrical equipment. Its safety or not directly determines whether the whole power grid can do reliable work. Therefore, transformer protection device is very important. Transformer protection configuration is usually realized by main protection and backup protection. Common transformer faults are mainly divided into internal and external faults. The main internal faults are handled by the main protection, while the main protection of the external faults is usually handled by backup protection. In this paper, the principle of transformer protection is deeply studied and analyzed. A digital transformer protection device based on DSP is designed. The working principle of main protection and backup protection of transformer is introduced in detail in this paper. The differential protection of the main protection includes the differential protection of the main protection and the over-current and overload of the backup protection. The differential protection of the main protection will be misoperated because of the inrush current of excitation. Therefore, the generation of excitation inrush current and the measures taken in this device are explained in detail. The unbalanced current will appear in the normal operation of transformer. In this paper, the causes of inrush current and unbalanced current and the elimination measures are explained in detail. The criterion of the protection device is obtained by Fourier transform algorithm. The fundamental, second and third harmonics calculated by the 24:00 Fourier algorithm are also listed in detail. The emphasis of this paper is on the design of the hardware and software system of the protection device. The hardware system of the device adopts a widely used plug-in structure, and each plug-in of the protection is independent and complementary to each other, which together constitute the protection device. All protection functions including network communication are realized. The hardware structure is built with TI's high-performance TMS320F2811 as the main control CPU, and the data acquisition and logical output are realized. The development of the software system is carried out in the CCS software environment, by adopting the method of combining main program and interrupt program. By using the powerful data processing and control ability of DSP, the efficiency is greatly improved and the power consumption is reduced. The peripheral equipments in the chip are rich in resources, and the functions of Ar / D conversion and serial port communication are completed. In this paper, the program flow of the software is introduced in detail. The speed and precision of the protection device meet the technical requirements of the microcomputer protection. For this purpose, various field debugging experiments, including network communication, are specially done. The main functions of the device are verified by experiments, and the device is debugged on the spot.
【學位授予單位】：山東大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM41;TM774

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相關期刊論文 前1條

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本文編號：1367568