基于半PWM移相的单电阻电流重构策略研究
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摘要
单电阻电流重构策略存在两个观测盲区:低调制度区域和扇区过渡区域。通过对PWM脉冲信号进行修正可以解决观测盲区内的最小采样时窗问题,实现有效的电流重构。传统的PWM脉冲的修正策略虽然解决了非观测区最小采样时窗不满足要求的问题,但是也导致了电流纹波的增大。在分析传统策略的基础上,提出了一种基于半PWM移相的电流重构策略,可以有效的改善由于PWM脉冲修正带来的电流纹波问题。仿真及实验结果表明:基于半PWM移相的单电阻电流重构策略可以有效地降低重构电流纹波,具有良好的重构效果。
The single-shunt current reconstruction strategy has two blind areas:low modulation area and sector transition area. By modifying the PWM pulse signal, the problem of the minimum sampling time in the blind areas can be solved, and effective current reconstruction can be realized. Although the traditional PWM pulse modifying strategy solved the problem that the minimum sampling time in blind areas, it also led to the increase of current ripple. Based on the analysis of traditional strategies, a new strategy was proposed, which can effectively improved the current ripple problem caused by PWM pulse modifying method. Simulation and experimental results show that the proposed strategy can effectively reduce the current ripple and has a good performance.
The single-shunt current reconstruction strategy has two blind areas:low modulation area and sector transition area. By modifying the PWM pulse signal, the problem of the minimum sampling time in the blind areas can be solved, and effective current reconstruction can be realized. Although the traditional PWM pulse modifying strategy solved the problem that the minimum sampling time in blind areas, it also led to the increase of current ripple. Based on the analysis of traditional strategies, a new strategy was proposed, which can effectively improved the current ripple problem caused by PWM pulse modifying method. Simulation and experimental results show that the proposed strategy can effectively reduce the current ripple and has a good performance.
引文
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[12] Blaabjerg F ,Pedersen J K ,Jaeger U ,et al.Single Current Sensor Technique in the DC Link of Three-Phase PWM-VS Inverters:A Review and a Novel Solution[J].IEEE Transactions on Industry Applications,1997,33(5):1241-1253.
[2] 陈小波,黄文新,胡育文,等.变频器单电阻电流采样及相电流重构方法[J].电气传动,2010,40(8):3-6.
[3] 李云辉.永磁同步电机相电流重构技术研究[D].哈尔滨:哈尔滨工业大学,2014.
[4] Gu Y ,Ni F ,Yang D ,et al.A Novel Phase Current Reconstruction Method Using a Single DC-link Current Sensor[C].International Conference on Mechatronics & Automation.IEEE,2009.
[5] 程善美,姜向龙,孙文焕,等.空间矢量PWM逆变器的仿真[J].微电机,2002,35(4):30-33.
[6] 徐亚雷,王志川,陶梦江,等.轮毂电机控制器的单电阻电流重构算法研究[J].微特电机,2016,44(4):56-59.
[7] Lee W C ,Lee T K ,Hyun D S .Comparison of Single-sensor Current Control in the DC Link for three-phase Voltage-source PWM Converters[J].IEEE Transactions on Industrial Electronics,2001,48(3):491-505.
[8] 陶梦江.电动自行车控制器研究与设计[D].北京:中国矿业大学,2015.
[9] Ha J I .Voltage Injection Method for Three-Phase Current Reconstruction in PWM Inverters Using a Single Sensor[J].IEEE Transactions on Power Electronics,2009,24(3):767-775.
[10] Sun K ,Wei Q ,Huang L ,et al.An Overmodulation Method for PWM-Inverter-Fed IPMSM Drive With Single Current Sensor[J].IEEE Transactions on Industrial Electronics,2010,57(10):3395-3404.
[11] Wu X,Tan G,Ye Z,et al.Optimized Common-Mode Voltage Reduction PWM for Three-Phase Voltage- Source Inverters[J].IEEE Transactions on Power Electronics,2016,31(4):2959-2969.
[12] Blaabjerg F ,Pedersen J K ,Jaeger U ,et al.Single Current Sensor Technique in the DC Link of Three-Phase PWM-VS Inverters:A Review and a Novel Solution[J].IEEE Transactions on Industry Applications,1997,33(5):1241-1253.