计及导体电晕流注光谱特性的冲击电压反演方法研究

冲击电压作用下强电场区产生的电晕流注将改变空间电荷分布情况，现有非接触式测量方法没有考虑电晕流注空间电荷引起的电场畸变，过电压测量不准确使设备绝缘故障频发。本课题通过研究空间电荷的光谱测量及计算方法，围绕导体冲击电晕流注放电过程，开展计及导体电晕流注光谱特性的冲击电压反演方法研究。主要内容包括：1）研究导体冲击电晕流注放电过程放电强度、发展速度等宏观特性的测量方法和空间电荷密度、电子温度等微观特性的测量方法，实现宏观特性和微观特性的同步测量；2）定量分析检测距离、波形参数和大气参数等对电晕流注宏观特性和微观特性的影响规律；3）建立基于实测光谱特性的准确的电晕流注空间电荷计算模型，实现标称电场与流注空间电荷电场的耦合计算，基于该耦合关系改进工频反演矩阵，将反演矩阵推广应用到过电压范畴。研究成果为高精度电力系统暂态电压特征参数非接触测量提供理论支撑，为非电量式测量方法奠定基础。

The corona flow generated in the strong electric field under the impact of the overvoltage will change the space charge distribution. Existing non-contact measurement methods do not take into account the electric field distortion caused by corona flow of space charge, and inaccurate overvoltage measurement causes frequent equipment insulation faults. Based on the spectral measurement and calculation method of space charge, this project develops the research of the impulse voltage inversion method which takes into account the spectrum characteristics of corona flow, focusing on streamer discharge process for conductor impulse corona. The main contents include: 1)Investigate the measurement method of the macro characteristics such as the discharge intensity and the development speed of the conductor impact corona discharge and the measurement method of the micro characteristics such as space charge density and electron temperature, and realize the simultaneous measurement of the macro characteristics and micro characteristics; 2)Quantitative analysis of the influence of detection distance, waveform parameters and atmospheric parameters on the macro and micro characteristics of corona flow; 3)Establish an accurate corona flow space charge calculation model based on the measured spectral characteristics to achieve the coupling calculation of the nominal electric field and the stream space electric field. Based on the coupling relationship, the power frequency inversion matrix is improved, and the inversion matrix is extended to the category of overvoltage. The project provides theoretical support for high-precision non-contact measurement of transient voltage characteristic parameters of power system and lays the foundation for non-electric measurement methods.