本文關(guān)鍵詞： 站域 備自投 自適應 保護　出處：《華南理工大學》2016年碩士論文　論文類型：學位論文

【摘要】：現(xiàn)階段,常規(guī)配置的變電站一般采用獨立的自動裝置,就像站內(nèi)的備自投裝置和低周減載裝置等。這種配置方式通過敷設專用的信號電纜,將站內(nèi)自動裝置相關(guān)的開關(guān)和刀閘的位置信息、將交流數(shù)據(jù)量通過專用的采集電路傳至裝置,由自動裝置識別運行方式的變化、判定裝置應采用的動作邏輯。相關(guān)開關(guān)和刀閘通過信號電纜接收到裝置發(fā)出的動作邏輯實現(xiàn)分閘、合閘動作。在這種配置方式下,每個自動裝置都需要敷設自己專用的信號采集電纜和動作輸出回路電纜,導致成本較高,接線形式十分復雜。自動裝置的投入和退役,以及檢修工作都因為復雜的回路接線導致存在運行人員的維護工作量大和失誤的風險。在變電站的運行方式發(fā)生變化時,由于傳統(tǒng)的備自投裝置采用的是繼電器邏輯,容易導致裝置的動作不正確。更重要的是,這種配置方式在變電站擴建或運行方式改變時,自動裝置的邏輯回路、動作邏輯設定和維護非常復雜繁瑣,既要修改主程序,又要拆裝電纜接線,運行維護工作量很大,而且導致了電網(wǎng)安全運行的風險。因此,傳統(tǒng)的自動裝置配備方式不能良好地適應多變的變電站運行方式。出于上述考慮,研究并開發(fā)一種變電站站域備自投保護系統(tǒng)就顯得非常必要。它需要實現(xiàn)以下功能:能夠自動判斷變電站的運行方式,對應建立備自投動作邏輯;具備過載聯(lián)切功能,預防主變過載情況;實現(xiàn)協(xié)調(diào)變電站各電壓等級備自投的動作邏輯等功能。本文對站域備自投保護原理進行了研究,分析了備自投動作邏輯自動建模、閉鎖條件、投退機制和過負荷聯(lián)切方式等內(nèi)容。對站域備自投保護系統(tǒng)的開發(fā)過程中的工程實現(xiàn)進行了說明,并介紹了中山電網(wǎng)范圍內(nèi)試運行情況。站域備自投保護具有三方面優(yōu)勢:1.在一套系統(tǒng)內(nèi)實現(xiàn)了變電站站域內(nèi)各電壓等級的備自投功能集成,避免了傳統(tǒng)的一個變電站設置多套備自投裝置,導致裝置間信息傳遞不暢、動作邏輯配合困難,以及聯(lián)切回路接線復雜等缺點,節(jié)省了建設投資,節(jié)約了運行維護成本。2.實現(xiàn)了對變電站運行方式的自動辨識,并自動建立與現(xiàn)有運行方式對應的備自投動作邏輯,大大提高了備自投保護對運行方式靈活變化的適應性,減少了變電站運行維護人員的工作量,降低了電網(wǎng)運行風險。3.通過在備自投裝置內(nèi)配置主變過載聯(lián)切功能,具備在預判變壓器過載情況下的負荷聯(lián)切功能,簡化了主變保護的二次回路。
[Abstract]:At the present stage, conventional substations generally use independent automatic devices, such as the standby device and low-cycle load reducer in the station. This configuration mode is by laying special signal cable. The position information of the switch and the knife gate related to the automatic device in the station is transmitted to the device through the special acquisition circuit, and the change of the operation mode is recognized by the automatic device. The action logic to be used by the judging device. The action logic of the relevant switch and the knife gate received by the device through the signal cable realizes the switch opening and closing operation. In this configuration mode. Each automatic device needs to lay its own special signal acquisition cable and action output circuit cable, which leads to high cost and complex wiring form. As well as the maintenance work because of the complex circuit wiring lead to the operation staff maintenance workload and the risk of errors. When the substation operation mode changes. Because the relay logic is used in the traditional automatic switchover device, it is easy to cause the operation of the device to be incorrect. More importantly, when the substation expansion or operation mode changes, the automatic device logic circuit. The operation logic setting and maintenance is very complicated and complicated. It is necessary to modify the main program and to disassemble and assemble the cable connection. The workload of operation and maintenance is very large, and it leads to the risk of the safe operation of the power grid. The traditional automatic device configuration mode can not adapt to the changeable substation operation mode. For the above considerations. It is very necessary to study and develop a kind of substation station backup protection system. It needs to realize the following functions: it can automatically judge the operation mode of substation and establish the logic of standby automatic operation; The utility model has the function of combined cutting of overload to prevent overload of main transformer; In this paper, the principle of automatic switching protection in substation is studied, and the automatic modeling and locking conditions of the automatic operation logic of standby are analyzed. In this paper, the mechanism of on-off and the mode of over-load combined cutting are introduced. The engineering implementation of the system in the development process is described. This paper also introduces the in-test operation of Zhongshan power network. There are three advantages in this system: 1. In one system, the function integration of each voltage level in substation is realized. It avoids the disadvantages of setting up multiple sets of standby automatic switching devices in a traditional substation, which results in poor information transmission between devices, difficulty in matching operation logic, and complex wiring of the connection circuit, and thus saves construction investment. The operation and maintenance cost is saved. 2. The automatic identification of the substation operation mode is realized, and the automatic standby operation logic corresponding to the existing operation mode is established automatically. It greatly improves the adaptability of standby protection to the flexible change of operation mode, and reduces the workload of substation operation and maintenance personnel. The operation risk of the power network is reduced .3. the secondary circuit of the main transformer protection is simplified by configuring the combined switching function of the main transformer overload in the standby automatic switching device and having the load combined cutting function under the condition of pre-judging the overload of the transformer.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TM762;TM63

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