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首页> 外文期刊>Power Electronics, IET >Analysis and experimental investigation for switching frequency characterisation of a three-level ac-dc converter using frequency domain approach
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Analysis and experimental investigation for switching frequency characterisation of a three-level ac-dc converter using frequency domain approach

机译：基于频域的三电平AC-DC变换器开关频率特性分析与实验研究

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摘要

In this study, a relay with hysteresis-based control technique is analysed for a three-phase three-level neutral point clamped (NPC) ac??dc converter. The converter draws sinusoidal current with unity power factor from the supply grid and keeps total dc-link voltage constant. The hysteresis-based current control has good dynamic response but suffers from variable switching frequency. The switching frequency characterisation of hysteresis current control based on time domain approach is more complicated for the multilevel converters. Therefore there is a need to address the characterisation based on frequency domain approach. Here, describing function method and Tsypkin's method are proposed for the switching frequency characterisation of the relay with hysteresis-based system. The proposed methods determine the maximum switching frequency and amplitude of the current tracking error and permit the calculation of maximum switching frequency in simple algebraic equations. The closed-loop control scheme of the relay with hysteresis-based current control is implemented for a three-phase three-level NPC ac??dc converter system. The performance of the proposed frequency domain characterisation has been studied using MATLAB/Simulink, and a laboratory model is developed for experimental verification.In this study, a relay with hysteresis-based control technique is analysed for a three-phase three-level neutral point clamped (NPC) ac-dc converter. The converter draws sinusoidal current with unity power factor from the supply grid and keeps total dc-link voltage constant. The hysteresis-based current control has good dynamic response but suffers from variable switching frequency. The switching frequency characterisation of hysteresis current control based on time domain approach is more complicated for the multilevel converters. Therefore there is a need to address the characterisation based on frequency domain approach. Here, describing function method and Tsypkin's method -nare proposed for the switching frequency characterisation of the relay with hysteresis-based system. The proposed methods determine the maximum switching frequency and amplitude of the current tracking error and permit the calculation of maximum switching frequency in simple algebraic equations. The closed-loop control scheme of the relay with hysteresis-based current control is implemented for a three-phase three-level NPC ac-dc converter system. The performance of the proposed frequency domain characterisation has been studied using MATLAB/Simulink, and a laboratory model is developed for experimental verification.
机译：在这项研究中，针对基于三相三电平中性点钳位（NPC）的AC ?? DC转换器，分析了一种基于磁滞控制技术的继电器。转换器从电网获取具有单位功率因数的正弦电流，并使总的直流母线电压保持恒定。基于磁滞的电流控制具有良好的动态响应，但开关频率可变。对于多电平转换器而言，基于时域方法的磁滞电流控制开关频率特性更为复杂。因此，需要解决基于频域方法的表征。在此，针对基于磁滞的继电器的开关频率特性，提出了描述函数法和Tsypkin法。所提出的方法确定了最大开关频率和电流跟踪误差的幅度，并允许以简单的代数方程式计算最大开关频率。针对三相三电平NPC acdc变换器系统，实现了基于滞环电流控制的继电器闭环控制方案。利用MATLAB / Simulink对提出的频域表征性能进行了研究，并建立了实验室模型进行实验验证。在这项研究中，针对基于三相三电平中性点的磁滞控制技术对继电器进行了分析。钳位（NPC）交流-直流转换器。转换器从电网获取具有单位功率因数的正弦电流，并使总的直流母线电压保持恒定。基于磁滞的电流控制具有良好的动态响应，但开关频率可变。对于多电平转换器而言，基于时域方法的磁滞电流控制开关频率特性更为复杂。因此，需要解决基于频域方法的表征。在此，为基于滞后的系统对继电器的开关频率特性进行描述，提出了描述函数方法和Tsypkin方法的方法。所提出的方法确定了最大开关频率和电流跟踪误差的幅度，并允许以简单的代数方程式计算最大开关频率。针对三相三电平NPC ac-dc转换器系统，实现了具有基于磁滞电流控制的继电器的闭环控制方案。已使用MATLAB / Simulink研究了所提出的频域表征的性能，并开发了用于实验验证的实验室模型。

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  • 来源
    《Power Electronics, IET》 |2011年第8期|p.936-942|共7页
  • 作者

    Behera R.K.; Das S.P.;

  • 作者单位

    Department of Electrical Engineering, Indian Institute of Technology, Patna-800013, India;

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