小电流接地故障暂态选线技术在炼化企业电网的应用

Application of transient line selection technology in petrochemical enterprise grid of small current grounding fault

炼化企业配电网与地方配电网存在一定差异,本文介绍了一种利用故障暂态信息的适用于炼化企业的小电流接地故障选线原理和装置,提出了基于瞬时性故障信息的线路绝缘监测思路,分析统计其在现场的运行情况。现场运行结果表明,该技术原理先进,选线成功率高,能够发现并纠正零序二次回路极性反接。线路绝缘监测,能更准确地用来估计线路的绝缘状态,从而减少停电时间和预防试验对电缆的损坏。

For a class of industrial processes with large time delay, Makes large time delay process into a weak time delay process by the Delay time decreasing predict output feedback method, and improved weakening parameter optimization methods to further improve the accuracy of output feedback. With the delay time weaken device to simplify the structure of the main con- troller PI-GPC （generalized predictive controller） and improve real-time of the algorithm in the way of identification. These mea- sures not only enhance the regularity of the input control signal but also improve the efficiency and accuracy of the response. Due to the simple algorithm and easily adjustable parameters, The control system reduces the difficulty of the reality of the proj- ect and has the significant theoretical and practical significance of solving the delay problems in the production process and im- prove the quality of the control by Simulation.