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Low Voltage Ride-Through for Indirect Matrix Converter Based Open-End Winding Drives

机译：基于间接矩阵转换器的开放式绕组驱动器的低压穿越

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摘要

Adjustable speed drives (ASD) are one of the major load components in power systems and with the advent of wide band gap devices, which provide efficiencies greater than 95%, variable frequency drives will continue to grow and integrate into the systems. ASDs serve a varied set of processes including HVACs, oilrigs and recently many electric vehicles (EV). The most commonly employed types are the DC-to-AC or AC-to-AC drives with DC/AC drives being more popular in storage and EV applications. AC/AC drives have been dominated by converters using large capacitors with DC bus viz. back-to-back converters. These converters are becoming more reliable and have been tested with new advancements in the industry. In addition, the DC bus capacitor provides an inbuilt energy storage mechanism, which could be used for ride-through operations during fault conditions. In some applications like wind turbines, the presence of large capacitive and reactive components in the drive could be a drawback due to lesser reliability and increased weight. Hence, converters that eliminate the need for large capacitors (viz. cycloconverters and matrix converters) are advantageous in such applications. Matrix converters (MC) have been in research and development for almost three decades, and several topologies and new modulation techniques have been proposed. In addition to elimination of the bulky DC bus capacitor, MCs provide sinusoidal input and output waveforms with lesser harmonics, and have inherent bi-directional power flow capability while offering full input power factor control. In industry, MCs are produced by few manufacturers and is still a niche product.;High frequency common mode voltage (CMV) switching is a by-product of the ASDs operating at medium to high frequencies and cause bearing currents to flow, which damage the machine and reduce their lifetime. Elimination or reduction of common mode voltage is a well-researched topic and it has been addressed with plenty of solutions for different kind of drives. One of the recently developed solution is the usage of open-end winding drive modulated using rotating space vectors. Open-end winding machine is constructed by opening the shorted side of an induction machine, which is supplied by another similar converter. Different types of converters including MCs have been used to construct this drive. Matrix converter based open-end winding drive have two types including direct and indirect matrix converter based drives and, this dissertation concentrates on the usage of a three-level indirect matrix converter based open-end winding.;It is important that the ASDs are reliable and dependable during fault conditions in the power system. They should be able to ride-through the fault, supply the losses, and maintain the flux in the motor since re-building it could affect the operations. System faults could create over-voltages or voltage sags (sags are more frequent than over-voltages) and many commercial drives address the voltage sag problem with a ride-through solution for up to 30 cycles of interruption. Ride-through solutions include usage of storage devices, modification of the drive or use of inherent kinetic energy.;Matrix converters lack an inbuilt storage device and modification of the drive could be expensive. This dissertation proposes a low voltage ride-through method for a three-level indirect matrix converter based open-end winding drive using the input filter capacitor. The three-level indirect MC drive has an advantage over other matrix converter based drives, that it can provide a ride-through solution without the need for modifications or addition of storage devices. The input filter capacitor on the three-level bus between the front-end converter and the two three level inverters is used as the voltage source during the fault while its voltage is maintained by using the kinetic energy from the motor. This is achieved by modification of control loops in a traditional vector control configuration to control the capacitor voltage by drawing power from the motor.;In summary, this dissertation describes a three-level indirect matrix converter for an open-end winding drive to eliminate the high frequency common-mode voltage, and proposes a low voltage ride-through method for the operation of the drive during fault conditions using the input filter capacitors as an energy transfer device. The method has been presented with detailed derivations and analyses and been verified using simulations and experimental results using a two-level inverter drive.
机译：可调速驱动器（ASD）是电力系统中的主要负载组件之一，随着宽带隙设备的出现，其效率超过95％，变频驱动器将继续发展并集成到系统中。 ASD服务于各种过程，包括HVAC，石油钻井平台和最近的许多电动汽车（EV）。最常用的类型是DC-AC或AC-AC驱动器，其中DC / AC驱动器在存储和EV应用中更为流行。交流/交流驱动器已被使用带有直流母线的大型电容器的转换器所主导。背对背转换器。这些转换器变得越来越可靠，并且已经在行业中取得了新的进步。此外，直流总线电容器提供了内置的能量存储机制，可在故障情况下用于穿越运行。在某些应用中，例如风力涡轮机，由于可靠性较低且重量增加，因此驱动器中存在较大的电容性和电抗性组件可能是一个缺点。因此，在此类应用中，无需大型电容器的转换器（即循环转换器和矩阵转换器）是有利的。矩阵转换器（MC）的研究和开发已经有将近三十年的时间，并且已经提出了几种拓扑和新的调制技术。除了消除笨重的直流总线电容器外，MC还提供了具有较小谐波的正弦输入和输出波形，并具有固有的双向功率流能力，同时提供了完整的输入功率因数控制。在工业上，MC很少由制造商生产，仍然是利基产品。高频共模电压（CMV）开关是在中高频下运行的ASD的副产品，并导致轴承电流流动，从而损坏了机器并减少其使用寿命。消除或降低共模电压是一个经过充分研究的主题，并且已经针对不同类型的驱动器提供了许多解决方案。最近开发的解决方案之一是使用通过旋转空间矢量调制的开放式绕组驱动器。开放式绕组机是通过打开感应机的短路侧来构造的，该感应机由另一个类似的转换器提供。包括MC在内的不同类型的转换器已用于构造该驱动器。基于矩阵变换器的开放式绕组驱动器有两种类型，包括基于直接变换器矩阵的驱动器和基于间接矩阵变换器的驱动器，本文主要研究基于三电平间接矩阵变换器的开放式绕组的使用。重要的是，ASD的可靠性并且在电力系统发生故障时可靠。他们应该能够解决故障，提供损失并保持电动机中的磁通，因为重建电动机会影响运行。系统故障可能会导致过电压或电压骤降（电压骤降比过电压更频繁），许多商用驱动器都采用穿越解决方案来解决电压骤降问题，最多可中断30个周期。穿越解决方案包括使用存储设备，修改驱动器或使用固有动能。矩阵转换器缺乏内置的存储设备，修改驱动器可能会很昂贵。本文针对使用输入滤波电容的三电平间接矩阵变换器的开放式绕组驱动，提出了一种低压穿越方法。与其他基于矩阵转换器的驱动器相比，三级间接MC驱动器具有一个优势，即无需修改或添加存储设备即可提供快速解决方案。在故障期间，将前端转换器和两个三电平逆变器之间的三电平总线上的输入滤波电容器用作电压源，同时利用电动机的动能来保持其电压。这是通过在传统的矢量控制配置中修改控制回路来实现的，以通过从电动机汲取功率来控制电容器电压。总之，本文描述了一种用于开环绕组驱动的三电平间接矩阵转换器，以消除交流电。高频共模电压，并提出了一种使用输入滤波电容器作为能量传输设备的故障情况下驱动器运行的低压穿越方法。已经对该方法进行了详细的推导和分析，并通过使用两级逆变器驱动的仿真和实验结果进行了验证。

著录项

  • 作者

    Krishnamoorthi, Santhosh.;

  • 作者单位

    University of Minnesota.;

  • 授予单位 University of Minnesota.;
  • 学科 Electrical engineering.;Engineering.
  • 学位 Ph.D.
  • 年度 2017
  • 页码 69 p.
  • 总页数 69
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:38:55

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