基于半桥LLC谐振变换器的并联均流研究
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摘要
随着大功率负载的需求,分布式供电电源系统结构逐渐取代了集中供电式电源系统结构。首先,针对LLC谐振变换器的非线性离散的动态系统,分析其工作过程,总结出关键器件的运行模态。然后分析导致并联系统各模块输出电流差异的原因,引入均流技术。采用最大电流自动均流法作为该系统的均流策略。在MATLAB的仿真环境中搭建半桥LLC的闭环仿真模型,其中主电路中的频率方波信号产生的部分由MATLAB中的S函数编写得到。采用三环闭环控制和PID算法控制相结合的方式,对比分析加入均流控制前后的输出波形差异,验证方案可行性。通过CAN通讯实现各模块之间的信息传递以及数据的采集和计算。此外,为使系统能够正常持续的工作,需要加入监控模块来实时监测整个系统的工作状态以及各模块的输出情况,立即做出判断,以便及时解决问题。
With the demand of high power load, the distributed power system architecture has gradually replaced the centralized power system architecture. Firstly, analyzed the working process of the nonlinear discrete dynamic system of LLC resonant converters and the working state of the key components are summarized in detail. Then analyze the reason of output current difference of each module in parallel system, and introducing the technology of current sharing. The maximum current automatic current sharing method is used as the current sharing strategy of the system. A closed loop simulation model of half bridge LLC is built in MATLAB simulation environment. The part of the frequency square wave signal generated in the main circuit is written by the S function in MATLAB. Use the combination of three loop closed loop control and PID algorithm control, analyze and compared the difference of output waveform before and after adding current sharing control, and the feasibility of the scheme is verified. Through the CAN communication to achieve the information transfer between modules and data acquisition and calculation. In addition, in order to enable the system to continue normal work, we need to join the monitoring module to monitor the working state of the whole system, and the output of each module. Then, make a judgment and solve the problem immediately.
With the demand of high power load, the distributed power system architecture has gradually replaced the centralized power system architecture. Firstly, analyzed the working process of the nonlinear discrete dynamic system of LLC resonant converters and the working state of the key components are summarized in detail. Then analyze the reason of output current difference of each module in parallel system, and introducing the technology of current sharing. The maximum current automatic current sharing method is used as the current sharing strategy of the system. A closed loop simulation model of half bridge LLC is built in MATLAB simulation environment. The part of the frequency square wave signal generated in the main circuit is written by the S function in MATLAB. Use the combination of three loop closed loop control and PID algorithm control, analyze and compared the difference of output waveform before and after adding current sharing control, and the feasibility of the scheme is verified. Through the CAN communication to achieve the information transfer between modules and data acquisition and calculation. In addition, in order to enable the system to continue normal work, we need to join the monitoring module to monitor the working state of the whole system, and the output of each module. Then, make a judgment and solve the problem immediately.
引文
[1]薛彪,袁斌华.一种改进的开关电源模块化并联均流方法研究[J].世界有色金属,2017(2):129-131
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[11]张天芳.开关电源的并联运行及其数字均流技术[J].淮海工学院学报:自然科学版,2006,15(1):29-32
[12]申翔.大功率开关电源并联均流系统的研究[D].合肥:合肥工业大学,2007
[13]曾正,邵伟华,胡博容,等.基于耦合电感的Si C MOSFET并联主动均流[J].中国电机工程学报,2017,37(7):2068-2080
[14]邓兴旺.基于DSP的并联DC/DC变换器数字均流技术研究[D].西安:西安科技大学,2015
[15]郝瑞祥,雷浩东,贺涛,等.一种具有自动均压均流特性的组合式LLC谐振变换器[J].电工技术学报,2016,31(20):151-160
[16]秦惠.LLC谐振全桥并联均流开关电源的研制[D].长沙:中南大学,2008
[17]李秋实.开关电源并联数字均流技术的研究[D].哈尔滨:哈尔滨工业大学,2008
[2]赵宪宁,高杰,庄志义.开关电源模块的并联均流和冗余设计[J].无线电工程,2015,8:62-64
[3]赵丽娟.模块式大功率直流电源并联均流技术的研究[D].石家庄:河北工业大学,2012
[4]张禁.开关电源并联系统数字化平均电流自动均流技术的研究[D].芜湖:安徽工程大学,2012
[5]董艳.半桥LLC谐振变换器设计与仿真[D].上海:上海交通大学,2011
[6]He J P,Wang J L,Bai G Z.Design and Analysis of a Novel Interleaving LLC SMPS with Load Current Sharing Performance[J].Advanced Materials Research,2013,677:346-353
[7]潘钢.数字式LLC谐振变换器及并联均流技术的研究[D].成都:西南交通大学,2015
[8]刘闯,徐鑫哲,刘海洋,等.基于电流平衡单元的输入并联输出并联型LLC谐振变换器模块[J].电工技术学报,2016,31(21):159-167
[9]Orietti E,Mattavelli P,Spiazzi G,et al.Current sharing in three-phase LLC interleaved resonant converter[C]//Energy Conversion Congress and Exposition,2009.Ecce.IEEE,2009:1145-1152
[10]王贤哲.基于DSP的数字开关电源研究与实现[D].大连:大连理工大学,2013
[11]张天芳.开关电源的并联运行及其数字均流技术[J].淮海工学院学报:自然科学版,2006,15(1):29-32
[12]申翔.大功率开关电源并联均流系统的研究[D].合肥:合肥工业大学,2007
[13]曾正,邵伟华,胡博容,等.基于耦合电感的Si C MOSFET并联主动均流[J].中国电机工程学报,2017,37(7):2068-2080
[14]邓兴旺.基于DSP的并联DC/DC变换器数字均流技术研究[D].西安:西安科技大学,2015
[15]郝瑞祥,雷浩东,贺涛,等.一种具有自动均压均流特性的组合式LLC谐振变换器[J].电工技术学报,2016,31(20):151-160
[16]秦惠.LLC谐振全桥并联均流开关电源的研制[D].长沙:中南大学,2008
[17]李秋实.开关电源并联数字均流技术的研究[D].哈尔滨:哈尔滨工业大学,2008