Induction motor drives(IMDs)can achieve high performance levels comparable to dc motor drives.A major problem in getting high dynamic performance in an IMD is the coupling between theflux and torque producing componen...Induction motor drives(IMDs)can achieve high performance levels comparable to dc motor drives.A major problem in getting high dynamic performance in an IMD is the coupling between theflux and torque producing components of stator current.This is successfully overcome in FOC(Field-Oriented Control)IM,making it to the industry standard control.The performance of an IMD with an improved power quality converter at the front end is presented in this study.In the IMD,boost converter is employed to reduce power quality difficulties at the utility interface.As the boost converter contains only one switch,it results in a low processing time and cost.To ensure sinusoidal supply currents with high PF(Power Factor)and minimal THD(Total Harmonic Distortion),a novel PFC(Power Factor Corrector)control technique is proposed.To enhance the performance of the converter and to lower distortions at the motor side,PI(Proportional Integral)controller is incorporated at the PFC side.Thus it controls the DC bus voltage.The proposed boost converter improves power quality by lowering overall harmonic distortion of AC mains current,improving power factor correction,and regulating dc-link voltage.It is designed,modelled,and simulated in the MATLAB/simulink platform.Using a DSP(Digital Signal Processor),the suggested system’s performance is experimentally validated.The system’s performance is evaluated for speed and load torque,and the power quality indices are determined to meet IEEE-519 standards under all operating conditions.From the obtained results,it is evident that the proposed system mitigates the power quality issues effectively.展开更多
针对双升压功率因数校正电路(dual boost power factor correction,DBPFC)输入电压采样和电感电流采样困难,控制电路复杂的问题,提出一种改进的DBPFC拓扑。该拓扑在MOS开关管的源极正串一个肖特基二极管以阻塞MOS开关管的体二极管,既可...针对双升压功率因数校正电路(dual boost power factor correction,DBPFC)输入电压采样和电感电流采样困难,控制电路复杂的问题,提出一种改进的DBPFC拓扑。该拓扑在MOS开关管的源极正串一个肖特基二极管以阻塞MOS开关管的体二极管,既可以采用电阻采样法来进行电感电流平均值取样,优化了控制电路设计。详细分析电路在一个开关周期内的工作模态和MOS开关管寄生电容对电路工作模态的影响,给出电路的重要仿真波形。对电路的功率损耗和效率进行了理论分析和对比。设计了基于该拓扑的实验样机,样机输出波形表明该电路抗扰动能力强,能够快速准确地实现功率因数校正。样机效率曲线验证了理论分析的正确性,表明电路在宽电压输入宽功率输出时均能取得良好的工作效率。展开更多
有源功率因数校正可减少用电设备对电网的谐波污染,提高电器设备输入端的功率因数。详细分析了有源功率因数校正APFC(active power factor corrector)原理,采用平均电流控制模式控制原理,设计了基于UC3854BN芯片的一种有源功率因数校正...有源功率因数校正可减少用电设备对电网的谐波污染,提高电器设备输入端的功率因数。详细分析了有源功率因数校正APFC(active power factor corrector)原理,采用平均电流控制模式控制原理,设计了基于UC3854BN芯片的一种有源功率因数校正电路方案,着重分析了电路主要参数的选择和设计。实践证明,采用APFC后,大大减小了输入电流的谐波分量,实现了功率因数校正。展开更多
传统的模拟有源功率因数校正电路(Active Power Factor Corrector,APFC)外围电路参数固定灵活性较差,并且容易受到分布参数、器件老化、环境温度和湿度等因素的影响,限制了电路的寿命,而且难以适应目前单相设备大功率化的要求。鉴于数...传统的模拟有源功率因数校正电路(Active Power Factor Corrector,APFC)外围电路参数固定灵活性较差,并且容易受到分布参数、器件老化、环境温度和湿度等因素的影响,限制了电路的寿命,而且难以适应目前单相设备大功率化的要求。鉴于数字控制具有可编程性、抗干扰性、不易受硬件老化和环境变化优点,论文基于TI的DSP控制芯片TMS320F2808设计了一款数字APFC电路,基于经典的乘法器控制原理,采用CCM和平均电流控制策略,利用分段变PI调节器来进行电压、电流双闭环调节控制,实现了输入电流对输入电压的很好跟踪。实验结果表明,电路在高达5kW的整个功率范围内都得到了很好的校正效果,满足了IEC61000-3-2对于谐波的要求,促进了单相APFC向大功率方向发展。展开更多
文摘Induction motor drives(IMDs)can achieve high performance levels comparable to dc motor drives.A major problem in getting high dynamic performance in an IMD is the coupling between theflux and torque producing components of stator current.This is successfully overcome in FOC(Field-Oriented Control)IM,making it to the industry standard control.The performance of an IMD with an improved power quality converter at the front end is presented in this study.In the IMD,boost converter is employed to reduce power quality difficulties at the utility interface.As the boost converter contains only one switch,it results in a low processing time and cost.To ensure sinusoidal supply currents with high PF(Power Factor)and minimal THD(Total Harmonic Distortion),a novel PFC(Power Factor Corrector)control technique is proposed.To enhance the performance of the converter and to lower distortions at the motor side,PI(Proportional Integral)controller is incorporated at the PFC side.Thus it controls the DC bus voltage.The proposed boost converter improves power quality by lowering overall harmonic distortion of AC mains current,improving power factor correction,and regulating dc-link voltage.It is designed,modelled,and simulated in the MATLAB/simulink platform.Using a DSP(Digital Signal Processor),the suggested system’s performance is experimentally validated.The system’s performance is evaluated for speed and load torque,and the power quality indices are determined to meet IEEE-519 standards under all operating conditions.From the obtained results,it is evident that the proposed system mitigates the power quality issues effectively.
文摘针对双升压功率因数校正电路(dual boost power factor correction,DBPFC)输入电压采样和电感电流采样困难,控制电路复杂的问题,提出一种改进的DBPFC拓扑。该拓扑在MOS开关管的源极正串一个肖特基二极管以阻塞MOS开关管的体二极管,既可以采用电阻采样法来进行电感电流平均值取样,优化了控制电路设计。详细分析电路在一个开关周期内的工作模态和MOS开关管寄生电容对电路工作模态的影响,给出电路的重要仿真波形。对电路的功率损耗和效率进行了理论分析和对比。设计了基于该拓扑的实验样机,样机输出波形表明该电路抗扰动能力强,能够快速准确地实现功率因数校正。样机效率曲线验证了理论分析的正确性,表明电路在宽电压输入宽功率输出时均能取得良好的工作效率。
文摘有源功率因数校正可减少用电设备对电网的谐波污染,提高电器设备输入端的功率因数。详细分析了有源功率因数校正APFC(active power factor corrector)原理,采用平均电流控制模式控制原理,设计了基于UC3854BN芯片的一种有源功率因数校正电路方案,着重分析了电路主要参数的选择和设计。实践证明,采用APFC后,大大减小了输入电流的谐波分量,实现了功率因数校正。
文摘传统的模拟有源功率因数校正电路(Active Power Factor Corrector,APFC)外围电路参数固定灵活性较差,并且容易受到分布参数、器件老化、环境温度和湿度等因素的影响,限制了电路的寿命,而且难以适应目前单相设备大功率化的要求。鉴于数字控制具有可编程性、抗干扰性、不易受硬件老化和环境变化优点,论文基于TI的DSP控制芯片TMS320F2808设计了一款数字APFC电路,基于经典的乘法器控制原理,采用CCM和平均电流控制策略,利用分段变PI调节器来进行电压、电流双闭环调节控制,实现了输入电流对输入电压的很好跟踪。实验结果表明,电路在高达5kW的整个功率范围内都得到了很好的校正效果,满足了IEC61000-3-2对于谐波的要求,促进了单相APFC向大功率方向发展。
