作者：薛家祥1, 罗海松1, 贺天鹏2
作者单位：1. 华南理工大学机械与汽车工程学院, 广东 广州 510640;
2. 贵州民族大学工程训练中心, 贵州 贵阳 550025
关键词：能量回馈;负载模拟;控制策略;小信号模型
摘要：
针对能量回馈电网型（能馈型）直流负载多样化的负载测试需求，提出基于交错并联Boost的模拟负载单元模块化设计方案，设计电流均值跟踪和电流峰值保护两者兼备的信号调理电路，研究基于逐个周期电流峰值限制的负载模拟双环控制策略。通过建立单个模拟负载模块电流控制的小信号模型，得到模拟负载模块输入电流的传递函数，并基于小信号模型设计PI调节器，改善模拟负载模块的性能。仿真与实验结果表明：模拟负载模块在启动后12 ms即可进入稳定工作状态，并且能在0.21 s内完成过流保护动作，恒流模式下负载模拟相对误差绝对值为3.602%。与目前市场产品相比，该方案动态响应快，精度高，更加稳定安全。
Design of modular simulated load unit for energy-feedback type DC load
XUE Jiaxiang1, LUO Haisong1, HE Tianpeng2
1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China;
2. Engineering Training Center, Guizhou Minzu University, Guiyang 550025, China
Abstract: In order to meet the various testing demands of energy feedback grid type DC electronic load,a modular design scheme of simulated load unit based on parallel boost was proposed,a signal conditioning circuit was designed to realize both mean current tracking and peak current protection,the load simulation double-loop control strategy based on the by-cycle peak current limit was studied.The transfer function of the input current in the simulated load module was obtained by establishing a current controlling small-signal model of the single simulated load module.The PI regulator was designed based on the small-signal model to improve the performance of the simulated load module.Simulated and experimental results indicated that simulated load module can enter a steady state after 12 ms since the start and can accomplish overcurrent protective action within 0.21 μs,the absolute relative error of load simulation in constant current mode was 3.602%.Compared with the current commercial products,this design has a faster dynamic response,higher precision,and it is much more stable and safer.
Keywords: energy feedback;load simulation;control strategy;small-signal model
2017, 43(10): 86-91 收稿日期: 2017-03-27;收到修改稿日期: 2017-05-03
基金项目: 广东省自然基金项目（S2013010015875，2015A030313675）；广东省协同创新与平台环境建设专项资金（2016B090918067）；2015年东莞市引进第三批创新科研团队项目（2017360004004）；广州市产学研协同创新重大专项（201604010111）
作者简介: 薛家祥(1963-),男,江苏徐州市人,教授,博导,研究方向为光伏并网逆变器及其分布式发电系统、数字化开关电源及智能控制、智能传感技术及网络化测控。
参考文献
[1] 陈继洋,廖冬初,蔡华锋,等. 机车电源测试用交流并网型直流电子负载的研究[J]. 电气传动,2017(1):67-72.
[2] PAHLEVANINEZHAD M,DAS P,DROBNIK J,et al. A novel ZVZCS full-bridge DC/DC converter used for electric vehicles[J].IEEE Transactions on Power Electronics,2012,27(6):2752-2769.
[3] 胡义华,陈昊,徐瑞东,等.一种高升压比直流变换器[J].电工技术学报,2012(9):224-230.
[4] SOUSA C V D,REZENDE G M D,MATOS F F,et al. Regenerative active electronic load for testing power transformers under linear and nonlinear conditions[J]. Journal of Control Automation and Electrical Systems,2016,27(1):1-13.
[5] 吴振兴,王翔,邹旭东,等. 一种三相电力电子负载的电流控制方法[J]. 中国电机工程学报,2010(30):7-14.
[6] 单任仲,肖湘宁,尹忠东,等. 能量回馈型电力电子负载的控制方法[J]. 中国电机工程学报,2010(18):62-66.
[7] TSANG K M,CHAN W L. Fast acting regenerative DC electronic load based on a SEPIC converter[J]. Power Electronics IEEE Transactions on,2012,27(1):269-275.
[8] 周林,李怀花,张林强,等. 光伏并网系统小信号动态建模及控制参数灵敏度分析[J]. 电力系统保护与控制,2013(5):1-5.
[9] UPADHYAY S,MISHRA S,JOSHI A. A wide band-width electronic load[J]. IEEE Transactions on Industrial,2012,59(2):733-739.
[10] 冯奕,林鹤云,房淑华,等. 飞轮储能系统能量回馈的精确小信号建模及控制器设计[J]. 电工技术学报,2015(2):27-33.sa
