高压直流输电线路分布参数测量新方法（英文）

A Novel Distributed Parameters Measurement Method of HVDC Transmission Line

为测量直流输电线路的电阻、自电感、对地电容及双极线路之间的耦合电感和电容等数据,建立了直流线路分布参数的改进模型。基于对称分量法分解双极线路模型,分别在线路受端开路和短路的状态下,在送端施加两相正序电源和零序电源,测量线路对应的开路阻抗和短路阻抗,联立正序及零序开路阻抗和短路阻抗求解线路的分布参数。该方法已应用于±800 k V普侨特高压直流线路参数测量,现场测量结果与依据线路几何尺寸计算的结果高度一致。因此,该方法可为保护整定、线路故障定位、RTDS/EMTDC仿真提供精确的直流输电线路参数。

In order to measure the distributed parameters such as the resistance, self-inductance, capacitance to ground, mutual inductance and coupling capacitance of a bipolar HVDC transmission line, the differential equations have been firstly established based on an improved circuit of the line, and further decomposed into the positive and zero sequence components of a two-phases AC circuit. Under the condition of the receiving terminals in the status of open circuit or short circuit, the positive sequence open circuit impedance and short circuit impedance have been measured respectively when a positive voltage has been applied on the sending terminals of the transmission line. Again the zero sequence open circuit impedance and short circuit impedances have been measured in the condition of the line in parallel connected while receiving terminals are in the status of open circuit or grounded short circuit. Then formulas to calculate distributed parameters have been deduced from the open circuit and short circuit impedances measured at both positive sequence and zero sequence modes. The measurement method has been tested on an ＋800kV UHVDC transmission line, and the measured results are highly consistent with the calculated theoretical data based on the designed geometrical dimensions of the line, Therefore, the measurement results can be used for protective setting, the RTDS and EMTDC simulation, and line fault location.