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Control and Design of a High Voltage Solid State Transformer and its Integration with Renewable Energy Resources and Microgrid System.

机译：高压固态变压器的控制和设计及其与可再生能源和微电网系统的集成。

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摘要

Solid State Transformer (SST) has been regarded as one of the most emerging technologies in the power distribution system. It has the advantages of low volume, low weight, fault isolation, and potential additional functions, such as voltage regulation, harmonic filtering, reactive power compensation, and etc. However, the involvement of large number of power devices makes the control of SST a challenge. In addition, the high voltage and high power hardware design of the SST is not easy, certain design methodology needs to be developed. Furthermore, the cost of the SST is much higher than the traditional transformer, how to justify this cost gap is also of great importance. In this dissertation, a systematic literature review is conducted for the development of SST in the future distribution system. The key components essential for the SST are reviewed and different techniques are compared. It is pointed out that the SST consists of multilevel/modular power converter structure with advanced power devices and magnetic materials achieves best performance in terms of the size and efficiency in high voltage operation condition. While the challenges, including control architecture and design methodology, need to be addressed. In addition, the potential markets for SST need to be identified for possible commercialization of the technology. In this research work, a three-stage modularized type SST based on Si IGBT is selected as the research target aiming at developing advanced control technologies, design methodology, and application areas of the SST. The first part of the dissertation focuses on the analysis, control, and design of the presented three-stage SST topology. First of all, the voltage and current sharing issues of the presented SST topology are analyzed and addressed. Firstly, a new control structure and design methodology is proposed for balancing the voltage of the rectifier stage by using the feedback regulation. This controller minimizes the coupling effect between the voltage balance controller and the original system controller. Therefore, the design of the original system controller can be as easy as the two-level converter system, and the two controllers will not interact with each other. Secondly, the modulation based voltage balance method is also explored with extremely fast voltage balance response. The design of the control system can also be regarded as a two-level converter system and the voltage balance is achieved by choosing the most suitable switching pairs of the H-bridges. Thirdly, a current sensor-less current balance controller is proposed for the parallel operated DC/DC stage. This method does not need any additional current sensors and can achieve the power sharing among converters of DC/DC stage well. Fourthly, a 3.6kV-120V/10kVA SST hardware prototype is designed and demonstrated for the smart grid application. The proposed control methods in chapter 3 and chapter 5 are adopted in this high voltage SST prototype. Various tests are conducted to verify the key characters of the presented SST topology compared with the traditional transformer. The second part of the dissertation focuses the on the advanced application of presented SST in the future renewable energy and microgrid systems. Firstly, a family of SST interfaced wind energy systems are proposed with the integrated functions of active power transfer, reactive power compensation, and voltage conversion. The proposed wind energy system can effectively replace the traditional transformers and reactive power compensation devices, therefore a highly compact and integrated system can be obtained and the cost of the SST can be better justified. Secondly, a SST interfaced microgrid system and its centralized power management strategy are proposed. The presented microgrid system can access the distribution system without bulky transformers and can manage both the AC and DC grid simultaneously, operating like an AC/DC hybrid microgrid. In this condition, SST plays as an energy router, benefiting the future residential systems. All the technologies proposed in this work are original and provide value information for further promotion and commercialization of the SST concept.
机译：固态变压器（SST）被认为是配电系统中最新兴的技术之一。它具有体积小，重量轻，故障隔离以及潜在的附加功能（例如电压调节，谐波滤波，无功功率补偿等）的优点。但是，由于涉及到大量的功率设备，因此SST的控制成为一种可能。挑战。此外，SST的高电压和高功率硬件设计并不容易，需要开发某些设计方法。此外，SST的成本比传统变压器高得多，如何弥补这一成本差距也非常重要。本文针对未来配送系统中SST的发展进行了系统的文献综述。审查了SST必不可少的关键组件，并比较了不同的技术。需要指出的是，SST由具有高级功率器件的多电平/模块化功率转换器结构组成，磁性材料在高压工作条件下的尺寸和效率方面均达到最佳性能。虽然需要解决包括控制体系结构和设计方法论在内的挑战。此外，需要确定SST的潜在市场，以实现该技术的商业化。在这项研究工作中，基于Si IGBT的三级模块化SST被选为研究目标，旨在开发SST的先进控制技术，设计方法和应用领域。论文的第一部分着重于对所提出的三阶段SST拓扑结构的分析，控制和设计。首先，分析并解决了所提出的SST拓扑的电压和电流共享问题。首先，提出了一种新的控制结构和设计方法，以利用反馈调节来平衡整流器级的电压。该控制器使电压平衡控制器和原始系统控制器之间的耦合效应最小。因此，原始系统控制器的设计可以像两级转换器系统一样容易，并且两个控制器不会互相影响。其次，还探索了具有极快电压平衡响应的基于调制的电压平衡方法。控制系统的设计也可以看作是两级转换器系统，并且通过选择最合适的H桥开关对来实现电压平衡。第三，提出了一种用于并联运行的DC / DC级的无电流传感器电流平衡控制器。这种方法不需要任何额外的电流传感器，并且可以很好地实现DC / DC级转换器之间的功率共享。第四，针对智能电网应用设计并演示了3.6kV-120V / 10kVA SST硬件原型。该高压SST原型采用了第3章和第5章中提出的控制方法。与传统变压器相比，进行了各种测试以验证所提出的SST拓扑的关键特性。论文的第二部分着重介绍了SST在未来可再生能源和微电网系统中的先进应用。首先，提出了一套具有SST接口的风能系统，它们具有有功功率传输，无功功率补偿和电压转换的集成功能。所提出的风能系统可以有效地替代传统的变压器和无功补偿装置，因此可以获得高度紧凑和集成的系统，并且可以更好地证明SST的成本。其次，提出了SST接口微电网系统及其集中式电源管理策略。提出的微电网系统无需大型变压器即可访问配电系统，并且可以像AC / DC混合微电网一样同时管理AC和DC电网。在这种情况下，SST充当了能源路由器，使未来的住宅系统受益。这项工作中提出的所有技术都是原始技术，它们为SST概念的进一步推广和商业化提供了有价值的信息。

著录项

  • 作者

    She, Xu.;

  • 作者单位

    North Carolina State University.;

  • 授予单位 North Carolina State University.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 280 p.
  • 总页数 280
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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