發(fā)布時間：2018-04-13 19:10

  本文選題：風電場 + 電纜網(wǎng)　； 參考：《重慶大學》2014年碩士論文

【摘要】：風電場由于受地形、環(huán)境等影響，35kV集電系統(tǒng)越來越多的選擇電纜線路。隨著風電場規(guī)模增大，電纜長度增加，導致系統(tǒng)電容電流水平較高，當系統(tǒng)發(fā)生單相接地故障時，會嚴重威脅電氣設備絕緣。因電力系統(tǒng)的中性點運行方式和單相接地故障關系非常的密切，故選擇合適的中性點運行方式可以靈活的提高35kV系統(tǒng)運行的可靠性以及經(jīng)濟性，對提高風電場安全運行水平擁有重要的意義。 論文以龍里風電場為研究對象，基于Matlab/Simulink平臺建立仿真計算模型，考慮接地故障時刻、接地故障點位置、接地故障點過渡電阻及接地電容電流四種影響因素下，中性點不接地、經(jīng)消弧線圈接地和經(jīng)小電阻接地時，電纜網(wǎng)發(fā)生接地故障的過電壓和過電流水平，通過對比分析，得出適合風電場35kV電纜網(wǎng)的中性點接地方式。主要成果有： ①對比不同運行方式下電纜網(wǎng)的運行效果，中性點采用消弧線圈接地時能實現(xiàn)對接地電容電流的有效補償，起到快速消弧的效果；中性點經(jīng)小電阻接地能夠抑制故障暫態(tài)過電壓，并可利用零序過流保護快速切除故障。 ②以消弧線圈接地為基礎配合小電阻接地的中性點接地方式，綜合了中性點經(jīng)消弧線圈接地快速消弧和中性點經(jīng)小電阻接地快速切除故障線路的優(yōu)點；通過對改進的中性點接地方式的暫態(tài)過程進行仿真，其暫態(tài)投切不會對系統(tǒng)造成沖擊，不影響設備安全運行。 基于風電場35kV電纜網(wǎng)的特點，得出一種適合該電纜網(wǎng)的中性點接地方式，即以消弧線圈接地為基礎，對于接地電容電流水平小于100A的電纜網(wǎng)，當單相接地故障發(fā)生時，首先利用中電阻限制其暫態(tài)過電壓水平，，如果是瞬時性故障，消弧線圈進行補償后故障自動消除，若是非瞬時性故障則利用短時并入小電阻增大接地點電流，啟動保護裝置快速切除故障線路；對于無需采用暫態(tài)過電壓抑制措施的接地電容電流大于100A的電纜網(wǎng)，當發(fā)生非瞬時性接地故障時，利用小電阻的短時投入啟動零序過流保護裝置快速切除故障。
[Abstract]:Due to the influence of topography and environment, more and more cable lines are chosen for 35 kV collector system.With the increase of wind farm scale and the increase of cable length, the capacitance current level of the system is higher. When the single-phase grounding fault occurs, the insulation of electrical equipment will be seriously threatened.Because the neutral operation mode of power system is closely related to the single-phase grounding fault, choosing the proper neutral operation mode can flexibly improve the reliability and economy of 35kV system operation.It is of great significance to improve the safe operation level of wind farm.This paper takes Longli wind farm as the research object, establishes the simulation calculation model based on the Matlab/Simulink platform, considering the time of the grounding fault, the location of the grounding fault point, the transition resistance of the grounding fault point and the grounding capacitance current, the neutral point is not grounded.When grounding through arc-suppression coil and grounding with small resistance, the overvoltage and over-current level of grounding fault occurred in cable network. Through comparison and analysis, the neutral grounding mode suitable for 35kV cable network in wind farm was obtained.The main results are:1 comparing the operation effect of cable network under different operation modes, when neutral point is grounded by arc suppression coil, it can realize effective compensation of grounding capacitance current and play the effect of fast arc suppression;The fault transient overvoltage can be suppressed by the neutral point grounding with small resistance, and the fault can be quickly removed by zero-sequence over-current protection.(2) on the basis of arc-suppression coil grounding with small resistance grounding, the advantages of fast arc suppression through arc-suppression coil grounding and fast fault line removal of neutral point through small resistance earthing are integrated;By simulating the transient process of the improved neutral grounding mode, the transient switching will not impact the system and will not affect the safe operation of the equipment.Based on the characteristics of 35kV cable network in wind farm, a neutral grounding mode suitable for the cable network is obtained, that is, based on arc-suppression coil grounding, when the grounding capacitance current level is less than 100A, when the single-phase grounding fault occurs,First, the transient overvoltage level is limited by medium resistance. If it is a transient fault, the arc suppression coil compensates for the fault and automatically eliminates the fault. If the transient fault is non-instantaneous, the transient current is increased by incorporating a small resistor in a short period of time.The fault line is removed quickly by starting the protective device, and for the cable network with grounding capacitance current greater than 100A which does not require transient overvoltage suppression, when a non-instantaneous grounding fault occurs,Using the short-time input of small resistance to start the zero-sequence overcurrent protection device, the fault can be quickly removed.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM614;TM862

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本文編號：1745819