有源补偿消弧线圈在电力电缆接地系统中的应用分析.pdfVIP

有源补偿消弧线圈在电力电缆接地系统中的应用研究 摘 要 论文主要针对电力电缆接地系统发生单相故障对地电容较大的问题， 研究采用电力电缆中性点经消弧线圈接地补偿系统以有效地解决此问题。 首先，文中分析了电力电缆谐振接地系统的原理和特点，论述了此种 接地方式优越性。综合考虑传统的消弧线圈存在的问题，采用消弧线圈全 过程的调谐方式：即正常情况下对地参数估计和调节串联电抗器使中性点 位移电压小于电源相电压的 15%；故障时迅速判断故障线路并且快速串联 有源消弧线圈调整到全补偿的位置，使接地点残余电流尽量很小达到动态 补偿的目 其次，针对采用的有源消弧线圈详细地描述了其结构及工作原理，应 用滞环电流控制策略驱动PWM 逆变器实现消弧线圈阻抗的快速连续变化， 精确补偿故障状态下包括对地电容电流和对地泄露电阻的接地电流。 最后，利用成熟的仿真软件，集成建立电力电缆谐振接地网络的综合 仿真模型，并针对有源消弧线圈全过程调谐方案进行全面的仿真论证，分 别从电缆率、不平衡度、接地故障和泄露电阻这四个角度进行仿真，仿真 结果表明接地电流能够快速有效地得到补偿，达到了预期的补偿效果。 关键词： 电力电缆 有源消弧线圈 全过程 PWM I Application Research of Active Compensation Arc in the power cable grounding system ABSTRACT This paper mianly talked about the problem about power cable grounding system which have single-phase fault when the grounding capacity is getting larger. Firstly, this paper analyses the principle and characteristic of the resonant grounded system of power cable,discusses the advantages of the grounding system. Considering the problems of the traditional arc suppression coil, we used the method of the whole process of arc suppression coil: under normal circumstance, estimates ground parameter and regulate setial reactor to allow the neutral displacement voltage is less than 15% of power phase voltage; under fault condition quickly determine the fault line and adjust to the position of full compensation in series with the active arc suppression coil, making the grounding residual current as little as possible to achieve the purpose of dynamic compensation. Secondly, in this paper, I gave a description of the active arc suppression coil’s structure and working principle, used hysteresi