基于DSP控制的交流电子负载的性能研究
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摘要
本文主要针对交流电子负载的控制策略进行了研究,并进行了硬件实现以及对电子负载的性能进行分析。针对传统控制方法不能精确模拟各种类型负载的问题,提出了一种指令阻抗结合SVPWM的控制策略,并给出了指令阻抗转化为指令电流的计算方法。通过MATLAB仿真验证了该控制策略的可行性。在硬件实现部分采用了带LCL滤波的三相PWM变换器构成主电路,基于TMS320F28335 DSP控制器实现了基于指令阻抗和SVPWM的控制算法,并进行了实验研究。通过实验证明了设计方案的可行性,能够精确实现对不同性质负载的电子模拟。在此基础上,通过实验对交流电子负载的性能进行了研究,分析了不同开关频率下、不同性质电子负载模拟侧电流谐波情况,进行了频谱分析,总结了其变化规律。当电子负载硬件参数已经固定的情况下,在模拟不同类型负载时,为了得到谐波含量更低的电流,可根据变化规律对电子负载开关频率进行选择。
The control strategy of AC electronic load is mainly studied, and the performance of AC electronic load is analyzed through hardware experiment. Aiming at the problem that various types of loads can′t be accurately simulated by traditional control methods, a control strategy of command impedance combined with SVPWM is proposed, and a calculation method for converting command impedance into command current is given. The feasibility of the control strategy is verified by the simulation of MATLAB. In the hardware implementation part, a three-phase PWM converter with LCL filtering is used to form the main circuit. Based on the TMS320 F28335 DSP controller, the control algorithm based on command impedance and SVPWM is implemented and experimental research is carried out. The feasibility of the design has been proved by experiments, and the precise control of different electronic analog loads has been realized. On this basis, the performance of AC electronic load is studied through experiments. Through spectrum analysis, the current harmonics of the analog side of different electronic loads at different switching frequencies are analyzed, and the variation law is summarized. When the hardware parameters of the electronic load are fixed, the switching frequency of the electronic load can be selected according to the changing law in order to obtain the lower harmonic current when simulating different types of loads.
The control strategy of AC electronic load is mainly studied, and the performance of AC electronic load is analyzed through hardware experiment. Aiming at the problem that various types of loads can′t be accurately simulated by traditional control methods, a control strategy of command impedance combined with SVPWM is proposed, and a calculation method for converting command impedance into command current is given. The feasibility of the control strategy is verified by the simulation of MATLAB. In the hardware implementation part, a three-phase PWM converter with LCL filtering is used to form the main circuit. Based on the TMS320 F28335 DSP controller, the control algorithm based on command impedance and SVPWM is implemented and experimental research is carried out. The feasibility of the design has been proved by experiments, and the precise control of different electronic analog loads has been realized. On this basis, the performance of AC electronic load is studied through experiments. Through spectrum analysis, the current harmonics of the analog side of different electronic loads at different switching frequencies are analyzed, and the variation law is summarized. When the hardware parameters of the electronic load are fixed, the switching frequency of the electronic load can be selected according to the changing law in order to obtain the lower harmonic current when simulating different types of loads.
引文
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[15] 宋鹏先,张郁颀,唐庆华.三相相控整流桥负载的数字化实现方法[J].电气传动,2017,47(2):65-68.SONG P X,ZHANG Y Q,TANG Q H.Digital realization method of three-phase phase controlled rectifier bridge load [J].Electrical Drive,2017,47 (2):65-68.
[16] 卞孝琴.基于Simulink的基波电流提取算法仿真与分析[J].电气技术,2016(3):51-55.BIAN X Q.Simulation and analysis of fundamental current extraction algorithm based on Simulink[J].Electrical Engineering,2016(3):51-55.
[17] RODRIGUEZ J R,DIXON J W,ESPINOZA J R,et al.PWM regenerative rectifiers:state of the art[J].IEEE Transaction on Industrial Electronics,2005,52(1):5-22.
[2] TAMYUREK B.A high-performance SPWM controller for three-phase UPS systems operating under highly nonlinear loads[J].IEEE Transactions on Power Electronics,2013,28(8):3689-3701.
[3] 李照,师延飞.单相能馈型交流电子负载的研究[J].通信电源技术,2017,34(1):50-52.LI Z,SHI Y F.Research on single-phase energy-feeding AC electronic load[J].Telecom Power Technology,2017,34(1):50-52.
[4] 安巧静,朱长青,赵月飞,等.能馈型交流电子负载直流电压分析及控制技术研究[J].华北电力大学学报(自然科学版),2015,42(2):15-22.AN Q J,ZHU C Q,ZHAO Y F,et al.Research on DC voltage analysis and control technology of energy-fed AC electronic load[J].Journal of North China Electric Power University (Natural Science Edition),2015,42(2):15-22.
[5] 杨超,龚春英.基于DSP的能量回馈型交流电子负载的研究[J].通信电源技术,2008,25(1):13-15.YANG C,GONG C.Research on energy feedback type AC electronic load based on DSP[J].Telecom Power Technology,2008,25(1):13-15.
[6] 王浩,曾岳南,刘锦辉.能馈型交流电子负载的研究[J].通信电源技术,2013,30(2):24-26.WANG H,ZENG Y,LIU J H.Study on energy-feeding AC electronic load[J].Telecom Power Technology,2013,30(2):24-26.
[7] BENHANARASUT K,BENJANARASUT J,NEAMMANEE B.Single phase AC electronic load with energy recovery[C]//2017 International Electrical Engineering Congress,Pattaya,2017:1-4.
[8] 丁学超.基于背靠背结构三相电力电子负载的研究[D].哈尔滨:哈尔滨工程大学,2016.DING X C.Research on three-phase power electronic load based on back-to-back structure [D].Harbin:Harbin Engineering University,2016.
[9] 王洪希,鲁长贺,田伟.基于双PWM变换器的能馈型交流电子负载研究[J].现代电子技术,2018,41(2):56-59.WANG H X,LU C H,TIAN W.Research on energy-fed AC electronic load based on double PWM converter[J].Modern Electronics Technique,2018,41(2):56-59.
[10] 宋健,陈增禄,张婧,等.能量回馈型电子负载的系统研究[C]//中国电工技术学会电力电子学会第十一届学术年会,杭州,2008.SONG J,CHEN Z L,ZHANG J,et al.Systematic research on energy feedback electronic load [C]//Eleventh Annual Conference of the Power Electronics Society of China Electrical Technology Society,Hangzhou,2008.
[11] 方露.基于DSP的馈能式电子负载控制系统的研究[D].西安:西安工程大学,2016.FANG L.Research on feedback electronic load control system based on DSP[D].Xi′an:Xi′an University of Engineering,2016.
[12] 张厚升,赵艳雷.DSP控制的能量回馈型交流电子负载设计[J].电力自动化设备,2011,31(12):110-113.ZHANG H S,ZHAO Y L.Design of energy feedback type AC electronic load controlled by DSP[J].Electric Power Automation Equipment,2011,31(12):110-113.
[13] GAN W,JI H C,YANG X W.A three-phase PWM rectifier with reactive power compensation function[C]// 2014 IEEE PES Asia-Pacific Power and Energy Engineering Conference,Hong Kong,2014:1-4.
[14] 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,2017,47(1):67-72.CHEN J Y,LIAO D C,CAI H F,et al.Research on AC grid-connected DC electronic load for locomotive power supply test[J].Electrical Drive,2017,47(1):67-72.
[15] 宋鹏先,张郁颀,唐庆华.三相相控整流桥负载的数字化实现方法[J].电气传动,2017,47(2):65-68.SONG P X,ZHANG Y Q,TANG Q H.Digital realization method of three-phase phase controlled rectifier bridge load [J].Electrical Drive,2017,47 (2):65-68.
[16] 卞孝琴.基于Simulink的基波电流提取算法仿真与分析[J].电气技术,2016(3):51-55.BIAN X Q.Simulation and analysis of fundamental current extraction algorithm based on Simulink[J].Electrical Engineering,2016(3):51-55.
[17] RODRIGUEZ J R,DIXON J W,ESPINOZA J R,et al.PWM regenerative rectifiers:state of the art[J].IEEE Transaction on Industrial Electronics,2005,52(1):5-22.
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