地区电网中性点接地方式选择及效果评价研究-工业工程专业论文.docxVIP

摘要 摘 要 I I 摘 要 本文对接地方式对电网系统运行产生的影响进行了全面的研究。针对国内地区 电网现在所采用的中性点不接地、谐振接地、电阻接地三种接地方式，分析了它们 的基本运行特性，科学的管理地区电网中性点接地方式，实现地区电网的实时调谐。 实现系统实时调谐的前提，是要有准确的电网电容电流的实时数据为基础。针对电 网电容电流的可变性，选择一种有效的方法，实时掌握电网的电容电流。根据实时 的电容电流，并按照系统补偿度的整定原则，实时调整消弧线圈的分接头，实现 66KV 系统消弧线圈实时调谐。实现 66KV 系统消弧线圈实时调谐，能够更加准确 和全面地分析电网的补偿度，同时也能使系统更准确、更快捷地选择消弧圈的分接 头位置。 在电网安全稳定运行的前提下，将中性点的移位电压控制在合理范围内，这样 就能有效地避免设备的绝缘水平在电压过高时遭到危害；电网出现接地情形时，只 有较小量的残流通过故障点，在最短的时间内迅速熄弧，及时恢复系统的正常运行， 将损失控制在最小范围。并且，当电网出现事故跳闸或进行用分离系统方式判断接 地线路等倒闸操作时，避免谐振的发生。最后对电网线路进行一次设备电容电流参 数测试，与电网电容电流计算程序所得数据进行比较。对实时调谐的电网系统进行 各项参数的测试，是否达到现场规程规定。为电网系统提供实时性、可靠性、安全 性的保证，不仅具有理论价值，还具有重大的现实应用价值和潜在的经济价值。 关键词：电力系统；中性点；接地方式；消弧线圈；谐振 Ab Abstract II II Abstract This paper studies the influence of grounding method on power system operation comprehensively. At present there are three kinds of neutral grounding methods used in domestic: neutral point grounding, resonant grounding, grounding resistance. We analyzed their basic operating characteristics, so that we can management area power network neutral point grounding way scientifically and make the region grid can real-time tuning. The system can be real-time tuning to accurately based on the real-time data of capacitance current of power grid.. We can choose a kind of effective method of real time control of the power grid to capacitive current according to the variability of capacitive current of power grid.. We can adjust the arc suppression coil in real time the tap and real-time tuning of 66 KV system arc suppression coil according to the real-time capacitance current compensation degree and system setting principles. If the 66 KV system arc suppression coil can real-time tuning, we can more accurately and comprehensively analysis the power grid compensation degrees, at the same time we also can make the system more accurate and faster to choose looping tap position. On the premise that the power grid operations safely and stable , if the migration of neutral point voltage controlled in a reasonable scope, the insu