级联H桥电力电子变压器控制参数优化

doi:10.16180/j.cnki.issn1007-7820.2021.11.012

摘要/Abstract

摘要：

PET作为分布式能源的重要环节,受到广泛的关注。由于非线性元件的存在,PET网侧电流谐波含量较高。文中以基于PR控制的CHB-PET为研究对象,采用电压外环和电流内环的双闭环控制策略,对CHB-PET进行参数优化。仿真结果表明,改变PR控制器的比例系数与谐振系数,网侧电流谐波含量也会随之改变。当比例系数保持不变,谐振系数从1 000变为100时,网侧电流谐波含量从3.24%下降到3.20%;当谐振系数保持不变,比例系数从50变为25时,网侧电流谐波含量从3.20%降为2.54%。由结果可知,相比于谐振系数,比例系数对网侧电流谐波含量的灵敏度更高。

关键词: 级联H桥, 电力电子变压器, 双闭环控制, 比例系数, 谐振系数, 谐波滤除, FFT分析, 总谐波失真

Abstract:

As an important part of distributed energy, PET has received widespread attention. Due to the existence of nonlinear components, the harmonic content of PET network side current is relatively high. In this study, CHB-PET based on the PR control is the research object, and the double closed-loop control strategy of voltage outer loop and current inner loop is adopted to optimize the parameters of CHB-PET. The simulation results show that changing the proportional coefficient and resonance coefficient of the PR controller will also change the harmonic content of the grid-side current. When the proportional coefficient remains unchanged and the resonance coefficient changes from 1 000 to 100, the harmonic content of the grid side decreases from 3.24% to 3.20%. Similarly, when the resonance coefficient remains unchanged and the proportional coefficient changes from 50 to 25, the harmonic content of grid side current decreases from 3.20% to 2.54%. The results show that compared with the resonance coefficient, the proportional coefficient is more sensitive to the harmonic content of the grid-side current.

Key words: cascaded-H bridge, power electronic transformer, double closed loop control, proportional coefficient, resonance coefficient, harmonic filtering, FFT analysis, total harmonic distortion

中图分类号:

TN710.1

高尚,姚磊,李洋,李睿欣. 级联H桥电力电子变压器控制参数优化[J]. 电子科技, 2021, 34(11): 75-80.

GAO Shang,YAO Lei,LI Yang,LI Ruixin. Control Parameter Optimization of Cascaded H-Bridge Power Electronic Transformer[J]. Electronic Science and Technology, 2021, 34(11): 75-80.

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参考文献 19

[1]	陈磊, 欧家祥, 张秋雁, 等. 电力电子变压器研究综述[J]. 电网与清洁能源, 2015, 31(12):36-42.
	Chen Lei, Ou Jiaxiang, Zhang Qiuyan, et al. A review of studies on power electronic transformers[J]. Power System and Clean Energy, 2015, 31(12):36-42.
[2]	Wang X Y, Liu J J, Ouyang S D, et al. Control and experiment of an h-bridge-based three-phase three- stage modular power electronic transformer[J]. IEEE Transactions on Power Electronics, 2015, 31(3):2002-2011. doi: 10.1109/TPEL.2015.2434420
[3]	李子欣, 高范强, 赵聪, 等. 电力电子变压器技术研究综述[J]. 中国电机工程学报, 2018, 38(5):1274-1289.
	Li Zixin, Gao Fanqiang, Zhao Cong, et al. Research review of power electronic transformer technologies[J]. Proceedings of the CSEE, 2018, 38(5):1274-1289.
[4]	张展, 杨东. 应用于PET的级联H桥直流侧电压平衡研究[J]. 电子测量技术, 2016, 39(4):4-8.
	Zhang Zhan, Yang Dong. Study of DC side voltage balance of cascaded H bridge used in PET[J]. Electronic Measurement Technology, 2016, 39(4):4-8.
[5]	Huber J E, Bõhler J, Rothmund D, et al. Analysis and cell-level experimental verification of a 25 kW All-SiC isolated front end 6.6 kV/400 V AC-DC solid-state transformer[J]. CPSS Transactions on Power Electronics and Applications, 2017, 2(2):140-148. doi: 10.24295/CPSSTPEA
[6]	耿琪, 胡炎, 何建宗, 等. 含电力电子变压器的交直流混合电网最优潮流[J]. 电网技术, 2019, 43(9):3288-3298.
	Geng Qi, Hu Yan, He Jianzong, et al. Optimal power flow for hybrid AC/DC grid with power electronic transformer[J]. Power System Technology, 2019, 43(9):3288-3298.
[7]	Han J, Kong X, Li P, et al. A novel low voltage ride through strategy for cascaded power electronic transformer[J]. Protection and Control of Modern Power Systems, 2019, 4(1):1-12. doi: 10.1186/s41601-019-0115-7
[8]	闫晗, 舒泽亮, 姚家煊, 等. 基于三相-单相电力电子变压器的牵引供电系统负载不平衡、无功和谐波潮流分析[J]. 电力自动化设备, 2019, 39(11):159-164.
	Yan Han, Shu Zeliang, Yao Jiaxuan, et al. Power flow analysis of unbalance,reactive power and harmonics in traction power supply system based on three-phase to single-phase power electronic transformer[J]. Electric Power Automation Equipment, 2019, 39(11):159-164.
[9]	季振东, 李东野, 孙毅超, 等. 一种三相级联型电力电子变压器及其控制策略研究[J]. 电机与控制学报, 2016, 20(8):32-39.
	Ji Zhendong, Li Dongye, Sun Yichao, et al. Research on a three-phase cascaded power electronic transformer and its control strategy[J]. Electric Machines and Control, 2016, 20(8):32-39.
[10]	王婷, 王广柱, 张勋. 基于模块化多电平矩阵变换器的电力电子变压器控制策略[J]. 电工技术学报, 2016, 31(18):108-115.
	Wang Ting, Wang Guangzhu, Zhang Xun. The control strategy of power electronic transformer based on modular multilevel matrix converters[J]. Transactions of China Electrotechnical Society, 2016, 31(18):108-115.
[11]	Wang L, Zhang D L, Wang Y, et al. Power and voltage balance control of a novel three-phase solid-state transformer using multilevel cascaded H-bridge inverters for microgrid applications[J]. IEEE Transactions on Power Electronics, 2015, 31(4):3289-3301. doi: 10.1109/TPEL.63
[12]	陈亚爱, 石永帅, 周京华, 等. 电力电子牵引变压器拓扑结构综述[J]. 电气传动, 2018, 48(10):89-96.
	Chen Yaai, Shi Yongshuai, Zhou Jinghua, et al. Overview of topological structure for power electronic traction transformer[J]. Electric Drive, 2018, 48(10):89-96.
[13]	黄小红, 李群湛, 舒泽亮. 一种模块化级联H桥构造的三相—单相同相牵引供电系统[J]. 电机与控制学报, 2017, 21(10):8-15.
	Huang Xiaohong, Li Qunzhan, Shu Zeliang. Three-phase to single phase co-phase traction power supply system based on modular multilevel cascade H-bridge[J]. Electric Machines and Control, 2017, 21(10):8-15.
[14]	李延林, 朱芳菲, 赵炜, 等. 电力电子变压器在智能电网中的应用[J]. 电子世界, 2017(10):133-134.
	Li Yanlin, Zhu Fangfei, Zhao Wei, et al. Application of power electronic transformer in Smart Grid[J]. Electronics World, 2017(10):133-134.
[15]	Feng J H, Chu W Q, Zhang Z X, et al. Power electronic transformer-based railway traction systems: challenges and opportunities[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2017, 5(3):1237-1253. doi: 10.1109/JESTPE.2017.2685464
[16]	金爱娟, 曹文彬, 游珊妮, 等. 单相光伏系统的逆变器控制策略[J]. 电子科技, 2017, 30(1):19-22.
	Jin Aijuan, Cao Wenbin, You Shanni, et al. Study of inverters of single-phase photovoltaic system control stategy[J]. Electronic Science and Technology, 2017, 30(1):19-22.
[17]	余平, 项鑫, 高菲. 弱电网下并网逆变器基于PI和PR控制技术对比研究[J]. 新型工业化, 2018, 8(2):24-34.
	Yu Ping, Xiang Xin, Gao Fei. Research on the comparison analysis of the PI and PR control in the grid connected inverter system under weak grid[J]. The Journal of New Industrialization, 2018, 8(2):24-34.
[18]	霍现旭, 赵长伟, 张慧颖, 等. 高谐波电网工况下光伏逆变器控制策略研究[J]. 可再生能源, 2019, 37(11):1679-1684.
	Huo Xianxu, Zhao Changwei, Zhang Huiying, et al. Contral strategy of PV inverter in high harmnonic power grid[J]. Renewable Energy Resources, 2019, 37(11):1679-1684.
[19]	Li Z X, Qu P, Wang P, et al. DC terminal dynamic model of dual active bridge series resonant converter[C]. Beijing:Proceeding of the IEEE Conference and Expo Transportation Electrification Asia-Pacific, 2014.

参数	数值
电网交流侧电压	10 kV
交流电流频率	50 Hz
电容C₁/C₂	1 mF/1 mF
级联模块数量	5
交流侧电感	10 mH
变压器变比	1 900/1 900
C₁/C₂额定电压	1 900 V/1 900 V
变压器工作频率	5 kHz