本文關鍵詞： 超導限流器 電磁暫態(tài) 等效磁路 零序電流保護 反時限過電流保護　出處：《天津大學》2014年碩士論文　論文類型：學位論文

【摘要】：近年來,電網的裝機容量和各電壓等級網架建設得到高速發(fā)展,網架結構大大加強,滿足了電網負荷增長和可靠供電的需求,但同時也使電網的短路容量持續(xù)增長。超導限流器是限制電網短路電流的有效措施之一,其可對輸電線路故障短路電流快速、平穩(wěn)、有效地限制,為解決輸電網安全穩(wěn)定運行的關鍵技術難題奠定基礎。本文主要研究飽和鐵心型超導限流器接入線路后的電磁暫態(tài)特性及其對保護的影響。本文對被動式及主動式飽和鐵心型超導限流器的工作原理進行了詳細分析,對比研究了兩種超導限流器各自的優(yōu)缺點。針對超導限流器的非線性特性及其實際應用結構(采用鐵心不等截面積設計,兩鐵心獨立結構或三柱式結構),本文提出了一種新式等效磁路法,有效、精確地分析了飽和鐵心型超導限流器接入線路發(fā)生故障后的電磁暫態(tài)特性。并在Simulink/Stateflow仿真平臺實現了飽和鐵心型超導限流器的仿真實現,所得結果與理論結果完全吻合。新等效磁路法的提出對于飽和鐵心型超導限流器的理論研究與實際應用都有重大意義。分析了超導限流器接入配電線路后對反時限過電流保護和階段式電流保護的影響。反時限過電流保護在國內外的配電線路得到廣泛應用,在配電線路上容易實現上下級配合關系,而且可以保證線路近端故障時的快速動作。在超導限流器接入后,反時限過電流保護的動作時限有所延長,且上下級保護配合的時間級差也增大,但是上下級保護之間的配合關系可以得到有效保證。對超導限流器接入超高壓輸電線路雙回線某線發(fā)生單相經過渡電阻接地故障時,當一回線重合于永久性故障時,以及超導限流器在不同運行工況下時對零序電流保護的影響。針對上述可能導致零序電流保護誤動的各種情況提出了相應的保護配置方案。
[Abstract]:In recent years, the installed capacity of the power grid and the construction of each voltage grade grid have been developed at a high speed, and the grid structure has been greatly strengthened to meet the demand of power network load growth and reliable power supply. The superconducting current limiter is one of the effective measures to limit the short-circuit current of the power network, which can limit the short-circuit current of the transmission line quickly, smoothly and effectively. In order to solve the key technical problems in the safe and stable operation of transmission network, this paper mainly studies the electromagnetic transient characteristics of saturated-iron core superconducting current limiter after it is connected to the transmission line and its influence on the protection. The working principle of the type saturated iron core superconducting current limiter is analyzed in detail. The advantages and disadvantages of two kinds of superconducting current limiter are compared. The nonlinear characteristics of the superconducting current limiter and its practical application structure are studied. A new equivalent magnetic circuit method is presented in this paper. The electromagnetic transient characteristics of saturated-iron core superconducting current limiter after the fault of the connection line are analyzed accurately, and the simulation of the saturated iron core superconducting current limiter is realized on the Simulink/Stateflow simulation platform. The results are in good agreement with the theoretical results. The new equivalent magnetic circuit method is of great significance for the theoretical study and practical application of the saturated core superconducting current limiter. The reverse time of the superconducting current limiter connected to the distribution line is analyzed. The influence of limiting current protection and stage current protection. Reverse time over-current protection is widely used in distribution lines at home and abroad. It is easy to realize the cooperation between the upper and lower levels on the distribution line, and it can guarantee the fast action of the near end fault of the line. After the superconducting current limiter is connected, the action time limit of the reverse time overcurrent protection is prolonged. The time level difference of upper and lower protection coordination is also increased, but the coordination relationship between upper and lower protection can be effectively guaranteed. When the superconducting current limiter is connected to the double circuit line of EHV transmission line, the fault of single phase passing through the resistance ground occurs, and when the superconducting current limiter is connected to the double circuit line of EHV transmission line, When the primary circuit is overlapped in a permanent fault and the superconducting current limiter affects the zero-sequence current protection under different operating conditions, a corresponding protection configuration scheme is proposed for the various cases mentioned above which may lead to the misoperation of the zero-sequence current protection.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM471

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