E-field distribution analysis on three types of converter double valve in 800kV valve hall
E-field distribution analysis on three types of converter double valve in 800kV valve hall
复制标题
800kV阀厅三种换流器双阀电场分布分析
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Jintao Liao
中科院分区：
文献类型：
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作者：
Jialong Wang;Hao Wu;Zhixian Deng;Zongren Peng;Jintao Liao
换流阀具有交直流电压转换和电能传输的功能。它是特高压直流换流站阀厅的重要设备。电晕放电严重影响换流阀的安全稳定运行，因此有必要对其表面电场分布进行分析。分析了我国某± 800 kV特高压直流输电工程3个高压（400- 800 kV）阀霍尔斯采用的3种典型双阀设计的结构特点。根据工程图纸，利用三维有限元软件ANSYS建立了各种屏蔽结构双阀的等效模型。考虑到实际阀厅中双阀间的相互影响，建立了同一阀厅内3个同类型双阀的有限元模型，分析了12脉波换流单元上部6脉波桥的电场分布。由于工作电压为交直流混合电压，在这些模型中采用了离散负载电压波形的瞬态电场分析。通过计算，总结并比较了正常工作条件下不同双阀型电磁阀的电场分布特性。结果表明，所有双阀屏蔽结构表面电场强度均低于电晕起始临界值，满足工程要求。该研究可为特高压直流输电工程换流阀屏蔽结构的设计和优化提供参考。
Converter valve possesses the function of AC-DC voltage conversion and power transmission. It is an important device in the valve hall of UHVDC converter station. Since the corona discharge has a serious impact on the safe and stable operation of converter valve, it is necessary to analyze its surface electric field (E-field) distribution. In this paper, the structure characteristics of three typical double valve designs have been analyzed, which were respectively used in three high voltage (400-800kV) valve halls of one ±800kV UHVDC transmission project in China. Based on the project drawings, the equivalent model of each type of double valve with shielding structure was built with three-dimensional (3D) finite-element method (FEM) software ANSYS. Considering the interaction of double valves in actual valve hall, three double valve FEM models of same type in one hall, which formed the upper 6-pulse bridge in the 12-pulse converter unit, were built for the analysis of E-field distribution. Due to the hybrid AC-DC operating voltage, the transient E-field analysis with discrete loading voltage waveforms was adopted in these models. After calculation, the E-field distribution characteristic of different double valve types were summarized and compared under the normal operating condition. The results showed that the surface E-field strength on the shielding structure of all the double valves was lower than the critical value of corona inception and could meet the project requirements. This research could provide valuable references for shielding structure design and optimization of converter valve in the UHVDC transmission project.