配网高阻接地故障伏安特性分析及检测

发布时间：2018-07-23 10:47

【摘要】：中性点有效接地中压配电网常发生弧光高阻接地故障,短路电流小,零序保护无法动作切除,但存在的电弧易引发火灾、人身伤亡等恶性事故。传统故障检测算法一般基于电弧热平衡模型,采用基于傅里叶变换的频域信号分析方法,但在非线性电弧的强噪声环境下检测成功率较低。针对该问题,首先提出了基于固体介质电击穿原理的非线性电弧模型,分析了电路线性元件和高阻接地非线性电阻的伏安特性,从时域角度采用最小二乘线性拟合抽取故障特征,提出了基于故障电阻非线性识别的高阻接地故障检测算法。大量仿真数据和现场试验数据证明了该故障模型比传统模型更精确,且所提检测算法具有较高的灵敏性和可靠性。
[Abstract]:The neutral point effective earthing medium voltage distribution network often has the arc light high resistance ground fault, the short circuit current is small, the zero sequence protection cannot be excised, but the existence arc is easy to cause the fire, the personal casualty and so on the malignant accident. The traditional fault detection algorithm is based on arc heat balance model and frequency domain signal analysis method based on Fourier transform, but the detection success rate is low in the strong noise environment of nonlinear arc. In order to solve this problem, a nonlinear arc model based on the principle of solid dielectric breakdown is proposed, and the volt-ampere characteristics of the linear elements of the circuit and the nonlinear resistance of high resistance grounding are analyzed. From the point of view of time domain, a fault detection algorithm based on nonlinear identification of fault resistance is proposed by using least square linear fitting to extract fault features. A large number of simulation data and field test data show that the fault model is more accurate than the traditional model, and the proposed detection algorithm has high sensitivity and reliability.
【作者单位】：电力系统及发电设备控制和仿真国家重点实验室(清华大学电机工程与应用电子技术系);
【基金】：国家自然科学基金项目(50937003,51007045,51120175001)~~
【分类号】：TM862

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