Abstract The alternative electrical power system equipment such as power electronic transformer is the core component of the distributed and renewable energy grid, facing the development needs to large capacity, compact and high voltage level. However, the development of power electronics technology reduces the size of electrical equipment, but also puts higher requirements on its insulation performance. Compared to the traditional electrical equipment, due to the direct exposure to the high frequency class sine wave, transient PWM switching pulse and other strong field special electrical stress, the operating condition of the alternative electrical power system equipment is worse. To support the reliable insulation design and state evaluation of alternative electrical power system equipment under the complex transient stress, based on the narrow pulse width and high signal-to-noise ratio characteristics of terahertz wave and the principle of the ellipsometry detection method, a space charge measurement method with high spatial and temporal resolution is proposed, and the transmission model of photo-electro-mechanical charge measurement signal is constructed. The model analysis points out that the space charge elastic wave generated by the perturbation of the electric field is approximately proportional to the light intensity difference detected by the balanced detector. Combined with the terahertz photoelectric field characterization model, it is feasible to recover space charge distribution by measuring the light intensity difference. The related work verified the feasibility of the proposed method from the theoretical level. Aiming to the key sensing detection part of the measurement system, based on molecular dynamics simulation, the design and modification of the elasto-optical sensor substrate material are carried out. Meanwhile, the modified design idea of sensor material based on SU-8 photoresist and hydroxylated functionalized graphene is proposed. The simulation results point out that the elastic modulus and Poisson's ratio of the SU-8/HFGR composite system shows a decreasing trend with the increase of temperature. Compared with the unmodified system, the mechanical stability of the composite system is improved. The average elastic modulus of the composite system is 4.420 9 GPa with a mean squared error of 0.146 6, and the average Poisson's ratio is 0.208 1 with a mean squared error of 0.009 8. Further, based on the photolithography principle, the highly reliable elasto-optical sensor is prepared. Further, based on the proposed optical measurement method, an ellipsometry measurement platform is designed and built. Since the charge perturbation elastic wave presents kHz repetition frequency and picosecond pulse width waveform characteristics, the piezoelectric actuator is selected as the kHz level repetition sinusoidal elastic wave input source, and the femtosecond laser is selected as the femtosecond pulse width pulsed elastic wave input source, so as to respectively simulate the space charge perturbed to produce kHz frequency and fs pulse width elastic wave scenarios. Then, the measurement results of the ellipsometry measurement platform are compared with the piezoelectric sensing module of the conventional electroacoustic pulse measurement system to verify the measurement performance of the developed sensor. The experimental results shows that the output voltage of the balanced detector is mV level, which is consistent with the traditional PEA piezoelectric sensor module. At the same time, the sensor could be used in optical measurement with high reliability to catch the kHz repeated elastic waves and fs pulse width elastic waves. Compared with the piezoelectric sensor module, the measurement waveform of the elasto-optical sensor is smoother and less distortion.
Gao Haoyu,Ren Hanwen,Li Qingmin等. Design and Measurement Verification of Elasto-Optical Sensor Adapted to Space Charge Measurement Method Based on Optoelectronics[J]. Transactions of China Electrotechnical Society, 2023, 38(3): 587-598.
[1] 李庆民, 于万水, 赵继尧. 支撑“双碳”目标的风光发电装备安全运行关键技术[J]. 高电压技术, 2021, 47(9): 3047-3060. Li Qingmin, Yu Wanshui, Zhao Jiyao.Key technologies for the safe operation of wind and solar power generation equipment in support of the “peak CO2 emissions and carbon neutrality” policy[J]. High Voltage Engineering, 2021, 47(9): 3047-3060. [2] 郑重, 苗世洪, 李超, 等. 面向微型能源互联网接入的交直流配电网协同优化调度策略[J]. 电工技术学报, 2022, 37(1): 192-207. Zheng Zhong, Miao Shihong, Li Chao, et al.Coordinated optimal dispatching strategy of AC/DC distribution network for the integration of micro energy Internet[J]. Transactions of China Electrotechnical Society, 2022, 37(1): 192-207. [3] 戴志辉, 陈思琦, 李毅然, 等. 复杂环状柔直配电网单极断线故障特性分析[J]. 电工技术学报, 2022, 37(5): 1229-1241. Dai Zhihui, Chen Siqi, Li Yiran, et al.Characteristic analysis of single-pole breakage fault in complex ring flexible DC distribution systems[J]. Transactions of China Electrotechnical Society, 2022, 37(5): 1229-1241. [4] Molina M G.Energy storage and power electronics technologies: a strong combination to empower the transformation to the smart grid[J]. Proceedings of the IEEE, 2017, 105(11): 2191-2219. [5] 魏云海, 陈民铀, 赖伟, 等. 基于IGBT结温波动平滑控制的主动热管理方法综述[J]. 电工技术学报, 2022, 37(6): 1415-1430. Wei Yunhai, Chen Minyou, Lai Wei, et al.Review on active thermal control methods based on junction temperature swing smooth control of IGBTs[J]. Transactions of China Electrotechnical Society, 2022, 37(6): 1415-1430. [6] 何东欣, 张涛, 陈晓光, 等. 脉冲电压下电力电子装备绝缘电荷特性研究综述[J]. 电工技术学报, 2021, 36(22): 4795-4808. He Dongxin, Zhang Tao, Chen Xiaoguang, et al.Research overview on charge characteristics of power electronic equipment insulation under the pulse voltage[J]. Transactions of China Electrotechnical Society, 2021, 36(22): 4795-4808. [7] Akram S, Gao Guoqiang, Liu Yang, et al.Degradation mechanism of A12O3 nano filled polyimide film due to surface discharge under square impulse voltage[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2015, 22(6): 3341-3349. [8] 卓振宇, 张宁, 谢小荣, 等. 高比例可再生能源电力系统关键技术及发展挑战[J]. 电力系统自动化, 2021, 45(9): 171-191. Zhuo Zhenyu, Zhang Ning, Xie Xiaorong, et al.Key technologies and developing challenges of power system with high proportion of renewable energy[J]. Automation of Electric Power Systems, 2021, 45(9): 171-191. [9] Tanaka Y.Advanced application of space charge measurement using PEA method for evaluation of insulating materials[C]//2018 IEEE International Conference on High Voltage Engineering and Application (ICHVE), Athens, Greece, 2019: 1-8. [10] 郝建, 廖瑞金, George Chen, 等. 油纸绝缘复合电介质的空间/界面电荷特性及其抑制方法综述[J]. 高电压技术, 2019, 45(10): 3192-3206. Hao Jian, Liao Ruijin, Chen G, et al.Review of space/interface charge characteristics and its suppression methods for oil-paper insulation composite dielectrics[J]. High Voltage Engineering, 2019, 45(10): 3192-3206. [11] Montanari G C, Fabiani D, Dissado L A.Fast charge pulses: the evidence and its interpretation[C]//2013 IEEE International Conference on Solid Dielectrics (ICSD), Bologna, Italy, 2013: 10-14. [12] Montanari G C, Dissado L A, Serra S.The hidden threat to HVDC polymeric insulation at design field: Solitonic conduction[J]. IEEE Electrical Insulation Magazine, 2014, 30(4): 39-50. [13] Li Shengtao, Zhu Yuanwei, Min Daomin, et al.Space charge modulated electrical breakdown[J]. Scientific Reports, 2016, 6: 32588. [14] Wang Yani, Wang Yalin, Wu Jiandong, et al.Research progress on space charge measurement and space charge characteristics of nanodielectrics[J]. IET Nanodielectrics, 2018, 1(3): 114-121. [15] 王健, 李庆民, 任瀚文, 等. 固体电介质空间电荷的光电子学测量方法研究进展[J]. 电工电能新技术, 2020, 39(3): 55-66. Wang Jian, Li Qingmin, Ren Hanwen, et al.Advances in optoelectronics-based measurement of space charge in solid dielectrics[J]. Advanced Technology of Electrical Engineering and Energy, 2020, 39(3): 55-66. [16] Takada T.Acoustic and optical methods for measuring electric charge distributions in dielectrics[C]//1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319), Austin, TX, USA, 2002: 1-14. [17] Ma Peng, Zhang Yewen, Holé S, et al.Calibration of the laser induced pressure pulse method when using a semiconducting electrode as the laser target[J]. Measurement Science and Technology, 2016, 27(2): 025003. [18] 温已年. 基于LIPP法的空间电荷测量系统[D]. 哈尔滨: 哈尔滨理工大学, 2017. [19] 黄印. 基于光学方法的低密度聚乙烯空间电荷测量研究[D]. 哈尔滨: 哈尔滨理工大学, 2014. [20] Dakovski G L, Kubera B, Shan Jie.Localized terahertz generation via optical rectification in ZnTe[J]. Josa B, 2005, 22(8): 1667-1670. [21] van der Valk N C J, Wenckebach T, Planken P C M. Full mathematical description of electro-optic detection in optically isotropic crystals[J]. Josa B, 2004, 21(3): 622-631. [22] 王璐. 超快电信号电光采样测试系统的研究[D]. 天津: 天津大学, 2006. [23] Wu Chaofu, Xu Weijian.Atomistic molecular modelling of crosslinked epoxy resin[J]. Polymer, 2006, 47(16): 6004-6009. [24] Dellmann L, Roth S, Beuret C, et al.Fabrication process of high aspect ratio elastic structures for piezoelectric motor applications[C]//Proceedings of International Solid State Sensors and Actuators Conference (Transducers '97), Chicago, IL, USA, 2002: 641-644. [25] Khoo H S, Liu Kuokang, Tseng F G.Mechanical strength and interfacial failure analysis of cantilevered SU-8 microposts[J]. Journal of Micromechanics and Microengineering, 2003, 13(6): 822-831. [26] Yu Hui, Balogun O, Li Biao, et al.Building embedded microchannels using a single layered SU-8, and determining Young’s modulus using a laser acoustic technique[J]. Journal of Micromechanics and Microengineering, 2004, 14(11): 1576-1584. [27] Wacogne B, Pieralli C, Roux C, et al.Measuring the mechanical behaviour of human oocytes with a very simple SU-8 micro-tool[J]. Biomedical Microdevices, 2008, 10(3): 411-419. [28] 韩智云. 直流GIL环氧树脂碳纳米复合材料关键物理性能的分子动力学模拟[D]. 济南: 山东大学, 2019. [29] 赵昌葆, 曹猛, 薛红前, 等. 石墨烯纳米片对碳纤维增强金属层板层间力学性能的影响[J]. 西北工业大学学报, 2022, 40(1): 141-147. Zhao Changbao, Cao Meng, Xue Hongqian, et al.Effect of graphene nanosheets on interlaminar mechanical properties of carbon fiber reinforced metal laminates[J]. Journal of Northwestern Polytechnical University, 2022, 40(1): 141-147. [30] Rakotondrabe M.Bouc-Wen modeling and inverse multiplicative structure to compensate hysteresis nonlinearity in piezoelectric actuators[J]. IEEE Transactions on Automation Science and Engineering, 2011, 8(2): 428-431. [31] 李宇阳, 朱玉川, 李仁强, 等. 双压电叠堆驱动执行器率相关迟滞建模与分析[J]. 压电与声光, 2019, 41(2): 258-264. Li Yuyang, Zhu Yuchuan, Li Renqiang, et al.Modeling and analysis of rate-dependent hysteresis for dual-piezoelectric stack driven actuator[J]. Piezoelectrics & Acoustooptics, 2019, 41(2): 258-264. [32] International Electrotechnical Commission.IEC/TS 62758-2012 Calibration of space charge measuring equipment based on the pulsed electro-acoustic (PEA) measurement principle[S]. Geneva, Switzerland, 2012.
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