Abstract In this paper, a single-stage charging/discharging high-frequency (HF) link DC-AC converter with low-frequency (LF) harmonic suppression was proposed. In addition, the crucial techniques were investigated and analyzed in detail, such as the circuit topology, analogous-rectifying unipolar phase-shifted control strategy with constant charging/discharging current, steady-state principles and input second harmonic current suppression. The important conclusions were obtained. The circuit topology is composed of an input second harmonic current suppression circuit and a cascaded single-stage charging/discharging HF link DC-AC converter. The control strategy rectifies the sinusoidal pulse width and position modulation (SPWPM) waves of HF transformer to output positive/negative half cycle sinusoidal pulse width modulation (SPWM) waves through the bi-directional rectification circuit, while realizing constant charging/discharging current of the battery. The input second harmonic current suppression circuit is an LrCr parallel-resonant circuit, which is connected in series between the battery and input filter capacitor. Experimental results of the designed prototype show that the proposed converter has the advantages of HF isolation, single-stage bi-directional charge/discharge, high conversion efficiency and small ripple of input current.
[1] José G de Matos, Felipe S F e Silva, Luiz A de S Ribeiro. Power control in AC isolated microgrids with renewable energy sources and energy storage systems[J]. IEEE Transactions on Industrial Electronics, 2015, 62(6): 3490-3498. [2] 沈鑫, 曹敏. 分布式电源并网对于配电网的影响研究[J]. 电工技术学报, 2015, 30(1): 346-351. Shen Xin, Cao Min.Research on the influence of istributed power grid for distribution network[J]. Transactions of China Electrotechnical Society, 2015, 30(1): 346-351. [3] Krommydas K F, Alexandridis A T.Modular control design and stability analysis of isolated PV- source/battery-storage distributed generation systems[J]. IEEE Journal on Emerging and Selected Topics in Circuits and Systems, 2015, 5(3): 372-382. [4] Zhou X S, Guo T, Ma Y J.An overview on microgrid technology[C]//IEEE International Conference on Mechatronics and Automation (ICMA), Beijing, China, 2015: 76-81. [5] Debnath D, Chatterjee K.Two-stage solar photo- voltaic-based stand-alone scheme having battery as energy storage element for rural deployment[J]. IEEE Transactions on Industrial Electronics, 2015, 62(7): 4148-4157. [6] 田春光, 田利, 李德鑫, 等. 基于混合储能系统跟踪光伏发电输出功率的控制策略[J]. 电工技术学报, 2016, 31(14): 75-83. Tian Chunguang, Tian Li, Li Dexin, et al.Control strategy for tracking the output power of photovoltaic power generation based on hybrid energy storage system[J]. Transactions of China Electrotechnical Society, 2016, 31(14): 75-83. [7] Tani A, Camara M B, Dakyo B.Energy management in the decentralized generation systems based on renewable energy-ultracapacitors and battery to compensate the wind/load power fluctuations[J]. IEEE Transactions on Industry Applications, 2015, 51(2): 1817-1827. [8] 桑丙玉, 陶以彬, 郑高, 等. 超级电容-蓄电池混合储能拓扑结构和控制策略研究[J]. 电力系统保护与控制, 2014, 42(2): 1-6. Sang Bingyu, Tao Yibin, Zheng Gao, et al.Research on topology and control strategy of the super- capacitor and battery hybrid energy storage[J]. Power System Protection and Control, 2014, 42(2): 1-6. [9] 吴理博, 赵争鸣, 刘建政, 等. 独立光伏照明系统中的能量管理控制[J]. 中国电机工程学报, 2005, 25(22): 71-75. Wu Libo, Zhao Zhengming, Liu Jianzheng, et al.A novel energy management and control for stand-alone photovoltaic lighting system[J]. Proceedings of the CSEE, 2005, 25(22): 71-75. [10] 陆治国, 祝万平, 刘捷丰, 等. 一种新型交错并联双向DC/DC变换器[J]. 中国电机工程学报, 2013, 33(12): 39-46. Lu Zhiguo, Zhu Wanping, Liu Jiefeng, et al.A novel interleaved parallel bidirectional DC/DC converter[J]. Proceedings of the CSEE, 2013, 33(12): 39-46. [11] Wu T F, Yang J G, Kuo C L, et al.Soft-switching bidirectional isolated full-bridge converter with active and passive snubbers[J]. IEEE Transactions on Industrial Electronics, 2014, 61(3): 1368-1376. [12] 师长立, 唐西胜, 李宁宁, 等. 基于全桥隔离双向变换器的直流变换技术[J]. 电工技术学报, 2016, 31(2): 121-127. Shi Changli, Tang Xisheng, Li Ningning, et al.DC changing technologies based on dual-active-bridge converter[J]. Transactions of China Electrotechnical Society, 2016, 31(2): 121-127. [13] Zhao B, Song Q, Liu W H, et al.A synthetic discrete design methodology of high-frequency isolated bidirectional DC/DC converter for grid-connected battery energy storage system using advanced components[J]. IEEE Transactions on Industrial Electronics, 2014, 61(10): 5402-5410. [14] Ganesan S I, Pattabiraman D, Govindarajan R K, et al.Control scheme for a bidirectional converter in a self-sustaining low-voltage DC nanogrid[J]. IEEE Transactions on Industrial Electronics, 2015, 62(10): 6317-6326. [15] Wang M Q, Guo S X, Huang Q Y, et al.An isolated bi-directional single-stage DC-AC converter using wide-band-gap devices with a novel carrier-based unipolar modulation technique under synchronous rectification[J]. IEEE Transactions on Power Electronics, 2017, 32(3): 1832-1843. [16] 丁明, 陈中, 程旭东. 级联储能变换器直流链纹波电流的抑制策略[J]. 电工技术学报, 2014, 29(2): 46-54. Ding Ming, Chen Zhong, Cheng Xudong.A scheme for suppressing DC ripple current of cascade converter for energy storage system[J]. Transactions of China Electrotechnical Society, 2014, 29(2): 46-54. [17] 陈艳平, 忻力, 李中浩. 单相电压型脉冲整流器中二次谐振电路的研究[J]. 机车电传动, 2010(2): 28-32. Chen Yanping, Xin Li, Li Zhonghao.Research on the secondary resonant circuit of single-phase voltage- pulse rectifier[J]. Electric Drive for Locomotives, 2010(2): 28-32.
2018, Vol. 33 
