750kV/±800kV输电工程交流滤波器暂态定值研究

Transient Rating of AC Filter in 750 kV/±800 kV Power Transmission Project

特高压直流输电工程换流器运行中会产生大量谐波,对电力系统稳定和通信线路运行等均会造成不良影响。加装交流滤波器可以有效地降低换流器谐波危害,提高系统运行可靠性,同时补偿换流器运行中所需的无功。为了使交流滤波器在各种工况下都能安全运行,必须合理地配置避雷器并确定交流滤波器的绝缘配合方案。750kV/±800kV接入方案是±800kV特高压直流输电工程最新的接入交流方案,首次根据特高压直流输电工程功能规范书的要求和交流滤波器元件参数特性,选取最严酷的运行工况,计算了交流滤波器暂态负荷情况,研究了交流滤波器内各元件电容、电抗、电阻以及避雷器的暂态电流、电压和能量,确定了交流滤波器各元件的绝缘水平和避雷器参数配置。研究表明,±800kV特高压直流直接接入750kV交流系统,合理配置交流滤波器避雷器可以有效降低滤波器设备内各元件的保护水平,同时满足特高压直流输电工程安全运行要求。研究结果可为工程建设提供技术支持。

Harmonics that generated in the converter operation in UHVDC transmission project will cause harmful impact on the stability of power system and the communication lines. The AC filter can effectively reduce the hazards of harmonics, improve the reliability of system operation, as well as compensate the reactive power required in the converter operation. In order to ensure the safe operation of AC filters under different conditions, the configuration of arrester and the insulation coordination of AC filter should be reasonable. The 750 kV/±800 kV access solution is the latest access solution of ±800 kV UHVDC transmission project. According to the requirements of functional specification in UHVDC transmission project and the characteristics of AC filter components, it is the first time in China to calculate the transient load of AC filter under the most severe operating conditions, to study the transient currents, voltage and energy of arrester and AC filter components： capacitance, reactance and resistance, thus the insulation level of each component of AC filter and the parameter configuration of arrester being obtained. The research results show that, when ±800 kV UHVDC transmission project is directly accessed into 750 kV AC system, the reasonable configuration of AC filter and arrester will effectively reduce the protection level of each component of AC filter, and make it meet the requirements of safe operation of UHVDC transmission project. Therefore, the research can provide technical supports for project construction.