Li Longchun1, Ji Baojian1, Hong Feng2, Yang Guanghao1
1. College of Electrical Engineering and Control Science Nanjing TECH University Nanjing 211816 China;
2. College of Electronic and Information Engineering Nanjing University of Aeronautics & Astronautics Nanjing 210016 China
To meet the requirements on medium and high voltage DC collection of photovoltaic grid-connected system, this paper proposes a 1 500 V three-level forward converter. By filtering the outputs in series-parallel centrally, the modularized architecture of DC collection is established with no internal filter in each DC/DC converter. With this approach, the voltage stress of the switch is lowered, and the impact of unbalanced components can be solved, and the electric energy transmission and the efficiency of whole system can be improved. Meanwhile, centralized filtering is conducive to downsize the filter, diminish the ripple of output voltage and decline the cost of system. In the proposed converter, the three-level voltage is superimposed by output voltages from the DC modules, which contributes to decrease the inductance current pulsation. With the introduction of series-parallel structure, and the effect of the failure of system is reduced. Moreover, the structure efficiently make the system easily-expansible and strong-versatile. The operation principle of the proposed system is discussed in detail in this paper and a prototype has been established. The test results verify the correctness of the proposed ideas.
李龙春, 嵇保健, 洪峰, 杨广浩. 1 500 V三电平正激变换器[J]. 电工技术学报, 2018, 33(9): 2044-2054.
Li Longchun, Ji Baojian, Hong Feng, Yang Guanghao. 1 500 V Three-Level Forward Converter. Transactions of China Electrotechnical Society, 2018, 33(9): 2044-2054.
[1] Thang T V, Thao N M, Jong-Ho J, et al.Analysis and design of grid-connected photovoltaics systems with multiple-integrated converters and a pseudo-DC-link inverter[J]. IEEE Transactions on Industrial Electronics, 2014, 61(7): 3377-3386.
[2] Gkoutioudi E, Bakas P, Marinopoulos A.Comparison of PV systems with maximum DC voltage 1 000 V and 1 500 V[C]//2013 IEEE 39 th Photovoltaic Specialists Conference (PVSC), Florida, USA, 2013: 2873-3878.
[3] Rub I, Ryota O, Tsuguhiro T, et al.Development of a 1500V dc photovoltaic inverter for utility-scale PV power plants[C]//2015 IEEE 2nd International Future Energy Electronics Conference (IFEEC), Taiwan, China, 2015, 1-4.
[4] Serban E, Ordonez M, Pondiche C.DC-bus voltage range extension in 1 500 V photovoltaic inverters[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2015, 3(4): 901-916.
[5] Kadri R, Gaubert J P, Champenois G.Nondissipative string current diverter for solving the cascaded DC-DC converter connection problem in photovoltaic power generation system[J]. IEEE Transactions on Power Electronics, 2012, 27(3): 1249-1258.
[6] Khan O, Xiao W, Zeineldin H H.Gallium-nitride-based submodule integrated converters for high-efficiency distributed maximum power point tracking PV applications[J]. IEEE Transactions on Industrial Electronics, 2016, 63(2): 966-975.
[7] Ganesh J N, Viswanathan K, Naik R, et al.Cascaded H-bridge control for PV application[C]//European Conference on Power Electronics and Application (EPE’15 ECCE-Europe), Geneva, Switzerland, 2015: 1-5.
[8] 李凯, 赵争鸣, 袁立强. 模块化多电平变换器上、下桥臂不对称运行环流重复控制[J]. 电工技术学报, 2016, 31(20): 123-128.
Li Kai, Zhao Zhengming, Yuan Liqiang.Repetitive control of circulating current in MMC with asymmetrical operation of upper and lower arms[J]. Transactions of China Electrotechnical Society, 2016, 31(20): 123-128.
[9] 刘邦银, 梁超辉, 段善旭. 直流模块式建筑集成光伏的拓扑研究[J]. 中国电机工程学报, 2008, 28(20): 99-104.
Liu Bangyin, Liang Chaohui, Duan Shanxu.Research on topology of DC-module-based building integrated photovoltaic system[J]. Proceedings of the CSEE, 2008, 28(20): 99-104.
[10] 刘邦银, 段善旭, 胡欢, 等. 直流模块式建筑集成光伏系统的协调控制[J]. 中国电机工程学报, 2008, 29(14): 109-114.
Liu Bangyin, Duan Shanxu, Hu Huan, et al.Coordinate control of DC-module-based building integrated photovoltaic system[J]. Proceedings of the CSEE, 2008, 29(14): 109-114.
[11] Liu Yushan, Abu-Rub H, Ge Baoming.Front-end isolated quasi-z-source DC-DC converter modules in series for high-power photovoltaic systems—part I: configuration, operation, and evaluation[J]. IEEE Transactions on Industrial Electronics, 2017, 64(1): 347-358.
[12] Liu Yushan, Abu-Rub H, Ge Baoming.Front-end isolated quasi-z-source DC-DC converter modules in series for high-power photovoltaic systems—part II: control, dynamic model, and downscaled verification[J]. IEEE Transactions on Industrial Electronics, 2017, 64(1): 359-368.
[13] 王书征, 赵剑锋, 姚晓君, 等. 级联型光伏并网逆变器在光照不均匀条件下的功率平衡控制[J]. 电工技术学报, 2013, 28(12): 257-259.
Wang Shuzheng, Zhao Jianfeng, Yao Xiaojun, et al.Power balanced controlling of cascaded inverter for grid-connected photovoltaic systems under unequal irradiance conditions[J]. Transactions of China Electrotechnical Society, 2013, 28(12): 257-259.
[14] 陈武, 阮新波, 颜红. DC/DC 多模块串并联组合系统控制策略[J]. 电工技术学报, 2009, 24(7): 93-102.
Chen Wu, Ruan Xinbo, Yan Hong.Control strategy for DC/DC multiple modules series-parallel combined systems[J]. Transactions of China Electrotechnical Society, 2009, 24(7): 93-102.
[15] 陈武, 阮新波, 颜红. 多变换器模块化串并联组合系统[J]. 电工技术学报, 2009, 24(6): 56-61.
Chen Wu, Ruan Xinbo, Yan Hong.Modularization structure for series-parallel connected converters[J]. Transactions of China Electrotechnical Society, 2009, 24(6): 56-61.
[16] 邱琰辉, 陈道炼, 江加辉. 多绕组同时供电直流变换器型多输入逆变器[J].电工技术学报, 2017, 32(6): 182-189.
Qiu Yanhui, Chen Daolian, Jiang Jiahui.Multi-winding simultaneously-supplying DC-DC converter mode multi-input inverter[J]. Transactions of China Electrotechnical Society, 2017, 32(6): 182-189.
[17] Mohammadi M, Milimonfared J, Moghani J S, et al.A high step-up current-fed phase-shift double-input DC-DC converter using asymmetrical PWM switching strategy[C]//The 6th Power Electronics, Drive Systems and Technologies Conference (PEDSTC2015), Tehran, Iran, 2015: 400-405.
[18] Sahoo M, Kumar K S.High gain step up DC-DC converter for DC micro-grid application[C]//The IEEE 7th International Conference on Information and Automation For Sustainability, Colombo, Sri Lanka, 2014: 1-5.
[19] Hyuntae C, Mihai C, Minsoo J, et al.Performance of medium-voltage DC-Bus PV system architecture utilizing high-gain DC-DC converter[J]. IEEE Transactions on Sustainable Energy, 2015, 6(2): 464-472.
[20] Kumar P K V, Sreenivasan M K. Hardware implementation of high efficient and high voltage gain DC-DC converter for DC microgrid applications[C]// 2015 IEEE International Conference on Electrical, Computer and Communication Technologies (ICECCT), Coimbatore, Tamilnadu, India, 2015: 1-5.
[21] Mahmoud M A, Mohamed A E, Mohammed O A.DC bus voltage control for PV sources in a DC distribution system infrastructure[C]//IEEE PES General Meeting, Minneapolis, USA, 2010: 1-5.
[22] Zhang X, Green T C.The modular multilevel converter for high step up ratio DC-DC conversion[J]. IEEE Transactions on Industrial Electronics, 2015, 62(8): 4925-4936.
[23] Parastar A, Kang Y, Seok J.Multilevel modular DC/DC power converter for high voltage DC-connected offshore wind energy applications[J]. IEEE Transactions on Industrial Electronics, 2015, 62(5): 2879-2890.
[24] 孙孝峰, 刘飞龙, 熊亮亮, 等. 双 Buck/Boost 集成双有源桥三端口DC-DC 变换器[J]. 电工技术学报, 2016, 31(22): 74-80.
Sun Xiaofeng, Liu Feilong, Xiong Liangliang, et al.Dual Buck/Boost integrated dual active bridge three-port DC-DC converter[J]. Transactions of China Electrotechnical Society, 2016, 31(22): 74-80.
[25] 宋鑫, 肖建国, 牛洁茹, 等. 一种用于新能源混合发电的移相控制三端口 DC-DC 变流器[J]. 电工技术学报, 2015, 30(17): 37-43.
Song Xin, Xiao Jianguo, Niu Jieru, et al.A three-port DC-DC converter with phase shift control for the hybrid renewable energy generation system[J]. Transactions of China Electrotechnical Society, 2015, 30(17): 37-43.
[26] 张犁, 胡海兵, 冯兰兰, 等. 模块化光伏并网系统欧洲效率优化控制方法[J]. 中国电机工程学报, 2012, 32(9): 7-13.
Zhang Li, Hu Haibing, Feng Lanlan, et al.European efficiency improvement control for grid-connected modular photovoltaic generation system[J]. Proceedings of the CSEE, 2012, 32(9): 7-13.
2018, Vol. 33 
