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Investigation of multi-level inverter concepts applied to regulation of power system voltages including imbalance.

机译：研究适用于调节电力系统电压（包括不平衡）的多电平逆变器概念。

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摘要

We are at the beginning of a new wave of utility applications for power electronics. The character of the power system load is changing, becoming more sensitive to the quality of power it receives. At low power levels, the demand for improved power quality has created a booming market for uninterruptible power supplies. But when power conditioning is required on a much larger scale, say for an entire industrial park, low power conditioning techniques cannot be directly scaled up. The utility applications requires handling three orders of magnitude more power while reducing the percent losses by more than an order of magnitude. The power conditioning circuit must also deal with power system line faults and severe three-phase voltage imbalance.; This work investigates the use of a new power electronic conversion structure, the multi-level inverter, for compensation of power system voltages during balanced and unbalanced conditions. The multi-level inverter structure is well suited for high-power, high-voltage conversion with low waveform harmonics. The inverter is used in a shunt-connected voltage-sourced configuration.; Three research thrusts are taken. First, is to analyze and understand the features of various multi-level topologies. Equations are developed that address the tradeoff between the number of voltage levels and system performance and cost. Second, the control dc bus capacitor voltages is addressed. A fundamental component switching function approach is used to develop equations for the capacitor currents, which are used to create a linearized decoupled control for the capacitor voltages. Third, compensator controls are developed for regulating unbalanced voltages. A fundamental problem is that the traditional three-phase qd synchronous frame transform has difficulties in handling imbalance. A new synchronous frame transform for unbalanced conditions is developed using a single-phase synchronous frame transform and sequence component theory.; A model distribution system is developed for the Electromagnetics Transient Program to demonstrate the operation of the multi-level inverter STATCON. The multi-level structure is shown to be capable of controlling its dc bus capacitor voltages and handling power system faults and effective in improving power quality for sensitive loads.
机译：我们正处于电力电子新的实用程序浪潮的开始。电力系统负载的特性正在发生变化，对其接收的电源质量越来越敏感。在低功率水平下，对提高电能质量的需求为不间断电源创造了蓬勃发展的市场。但是，当需要大规模进行功率调节时，例如整个工业园区，就无法直接扩大低功率调节技术的规模。公用事业应用程序需要多处理三个数量级的功率，同时将损耗百分比降低一个数量级以上。电力调节电路还必须处理电力系统线路故障和严重的三相电压不平衡。这项工作研究了在平衡和不平衡条件下使用新的电力电子转换结构多电平逆变器补偿电力系统电压的方法。多电平逆变器结构非常适合具有低波形谐波的大功率，高压转换。逆变器用于并联的电压源配置。采取了三个研究重点。首先，是分析和理解各种多层拓扑的功能。提出了解决电压电平数量与系统性能和成本之间权衡问题的方程式。其次，解决了控制直流总线电容器的电压问题。基本的分量开关函数方法用于开发电容器电流的方程式，这些方程式用于创建电容器电压的线性去耦控制。第三，开发了补偿器控制装置来调节不平衡电压。一个基本问题是传统的三相qd同步帧变换难以处理不平衡问题。利用单相同步帧变换和序列分量理论，开发了一种新的不平衡条件下的同步帧变换。为电磁暂态程序开发了模型分配系统，以演示多电平逆变器STATCON的操作。该多层结构显示出能够控制其直流总线电容器电压并处理电力系统故障的能力，并有效地提高了敏感负载的电能质量。

著录项

  • 作者

    Hochgraf, Clark Glenn.;

  • 作者单位

    The University of Wisconsin - Madison.;

  • 授予单位 The University of Wisconsin - Madison.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 1997
  • 页码 201 p.
  • 总页数 201
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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