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Analysis of some application aspects in modern (PWM) adjustable speed drive systems and new solutions.

机译：分析现代（PWM）可调速驱动系统中的一些应用方面和新解决方案。

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In this dissertation, the effects of application aspects such as high common mode dv/dt, high differential mode dv/dt, neutral shift, and capacitor heating in modern PWM adjustable speed AC motor drives are thoroughly analyzed. These aspects have been described as the cause for premature failures in many modern PWM adjustable speed AC motor drive (ASD) system installations. First, an in depth analysis of the effect of high common mode and high differential mode dv/dt on two popular ASD systems is presented. Then, analysis of the effect of neutral shift on two medium-voltage (4160V) ASD systems is presented. Finally, a new method to evaluate dc-link capacitor heating in ASD systems is proposed. The evaluation is based on the level of ripple currents dc-link capacitors can endure that lead to self-heating and reduction of capacitors' operating life. Three popular utility interface options for ASD systems are considered for evaluation.; To mitigate the effect, this dissertation also proposes some new solutions. First, two new inverter output filters with interconnection to the dc-link mid-point is proposed to mitigate the effect of high differential mode and high common mode dv/dt in diode rectifier/PWM and PWM rectifier/PWM inverter type ASD systems. The proposed filters are shown to effectively reduce both differential mode and common mode dv/dt at motor terminals even in the presence of long motor leads. Both filters permit use of long motor leads and the components can be installed within inverter enclosure. Next, a new multi-level PWM strategy is introduced which results in zero common mode voltage for medium-voltage cascaded multi-level (CML) type inverters. A zero sequence blocking transformer (ZSBT) is also proposed to reduce common mode voltage in 3-level NPC inverters. Finally, a new term capacitor heating factor (CHF ) based on the dependence of ESR on frequency is introduced to evaluate various utility interface options. A relative comparison of capacitor heating as a function of utility interface options is presented and it is shown from analysis and experiments that 12-pulse rectifier results in lower heating of the capacitor and hence promotes higher reliability.
机译：本文全面分析了高共模dv / dt，高差模dv / dt，空档和电容器在现代PWM可调速交流电动机驱动器中的应用等方面的影响。这些方面已被描述为许多现代PWM可调速交流电动机驱动（ASD）系统安装中过早故障的原因。首先，深入分析了高共模和高差模dv / dt对两个流行的ASD系统的影响。然后，分析了空挡对两个中压（4160V）ASD系统的影响。最后，提出了一种评估ASD系统中直流链路电容器发热的新方法。该评估基于直流链路电容器可承受的纹波电流水平，该波动会导致自发热并缩短电容器的使用寿命。考虑使用ASD系统的三种流行的实用程序接口选项进行评估。为了减轻这种影响，本文还提出了一些新的解决方案。首先，提出了两个与逆变器中点互连的新型逆变器输出滤波器，以减轻二极管整流器/ PWM和PWM整流器/ PWM逆变器类型的ASD系统中的高差分模式和高共模dv / dt的影响。所示的滤波器显示出即使在电动机引线较长的情况下，也可以有效地降低电动机端子处的差模和共模dv / dt。两个过滤器均允许使用较长的电动机导线，并且可以将组件安装在逆变器外壳内。接下来，引入了一种新的多级PWM策略，该策略可为中压级联多级（CML）型逆变器提供零共模电压。还提出了一种零序阻塞变压器（ZSBT），以降低3级NPC逆变器中的共模电压。最后，根据ESR对频率的依赖关系，引入了一个新的术语电容器加热因数（CHF to），以评估各种实用接口选项。给出了根据工具接口选项变化的电容器加热的相对比较，并且通过分析和实验表明，12脉冲整流器可降低电容器的发热，从而提高可靠性。

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