Analysis on Active Power Loss of Bushing Conductor Considering Skin Effect
Du Lin1, Zhang Ke1, Feng Hui1, He Peng2, Cao Yawei3, Yang Feng4
1. State Key Laboratory of Transmission and Distribution Equipment and System Safety and New Technology Chongqing University Chongqing 400044 China; 2. State Grid Hunan Electric Power Co. Ltd Changsha 410004 China; 3. Tianfu New District Power Supply Company State Grid Sichuan Electric Power Company Chengdu 610000 China; 4. School of Engineering and Technology Southwest University Chongqing 400716 China
Abstract：With the increasing proportion of new energy in the power grid and the access characteristics of a large number of power electronic equipment, the problem of new power system harmonics becomes increasingly significant. The actual current passing through the current carrying structure of power equipment such as sleeve contains a large number of high order harmonics. As a very important electrical equipment in power system, high voltage bushing is used for ground insulation of incoming and outlet lines of power equipment such as transformers, reactors and circuit breakers, and high voltage circuit crossing walls. This paper takes the active power loss of bushing under the action of harmonics as the starting point, and considers the enhancement effect of skin effect on harmonic loss of current-carrying conductor. The active power loss characteristics of casing current carrying structure under harmonic current are studied. Firstly, based on the basic electromagnetic field theory, the calculation model of the harmonic resistance and active power loss of the current carrying structure of the casing is established, and the superposition of the active power loss of the casing under different harmonic components and the correctness of the calculation method of the active power loss of the current carrying structure under the consideration of skin effect are verified theoretically and experimentally. Finally, based on the current waveform obtained by simulation, the active power loss of the current carrying structure of the casing was quantitatively calculated, and the enhancement coefficient of the harmonic current on the active power loss of the current carrying structure under skin effect was proposed to correct the active power loss of the current carrying structure of the casing. From a theoretical point of view, the superposition of the active power loss of the current structure and the change rule of harmonic resistance were verified by taking into account the influence of skin effect and the effect of harmonic current, and the superposition test platform was built. Under the three groups of comparison experiments, the relative error between the active power P0 generated by the composite current and the sum of the active power P under the harmonic current was all within 3%. Moreover, the harmonic resistance of the casing increases with the increase of harmonic frequency. The superposition of harmonic loss of the conductor is proved from the test point of view. Based on the actual HVDC system put into operation in Yunguang, the actual current waveform of the rheological casing is simulated, and the enhancement coefficient of harmonic current on active power loss under skin effect is proposed, and the active power loss of the current carrying structure of the casing is quantitatively calculated. For the current waveforms analyzed in the paper and simulated, the harmonic resistance increases by 0~28% within 50 harmonics, and the active power loss enhancement coefficient is 4.33%. For other casing current-carrying structures, the active power loss can be quantitatively calculated using the above method according to the size of the current-carrying structure, the material and the current waveform flowing through it. The following conclusions can be drawn from the simulation analysis: (1) Based on the electromagnetic field theory and combined with the actual structure of the current carrying conductor in the casing, the calculation model of the harmonic resistance of the current carrying structure of the casing is established taking into account the skin effect. (2) The superposition of the active power loss of the current-carrying conductor under the action of harmonic current and skin effect is theoretically deduced; The test platform was built and verified by 3 groups of comparative tests. (3) The HVDC transmission simulation platform was established. The calculation results of harmonic power loss of the casing at the side of the rheological valve showed that the loss of harmonic current on the casing current-carrying conductor accounted for 4.33% of the fundamental power loss, which accounted for 2.09% of the fundamental current. Under the skin effect, the harmonic current significantly enhanced the active power loss of the casing current-carrying conductor.
杜林, 张科, 冯辉, 贺鹏, 曹雅玮, 杨峰. 计及趋肤效应的套管载流结构损耗分析[J]. 电工技术学报, 2023, 38(17): 4746-4756.
Du Lin, Zhang Ke, Feng Hui, He Peng, Cao Yawei, Yang Feng. Analysis on Active Power Loss of Bushing Conductor Considering Skin Effect. Transactions of China Electrotechnical Society, 2023, 38(17): 4746-4756.
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2023, Vol. 38 
