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Enabling renewable power generation and efficient energy use. An anti-islanding method and an active damping method for OCC converters.

机译：实现可再生能源发电和高效能源利用。 OCC转换器的防孤岛方法和主动阻尼方法。

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摘要

Power electronics converters are essential for applications of micro-grids, renewable resources integration in power systems, and power conditioning for efficient energy use. In practice, long cable connection between the source and the power converter may affect the system stability when the power converter voltage is regulated. The first part of the thesis addresses the standard compliance issue for connecting renewable to grid on the meter side, i.e. how to detect and handle islanding condition. An active anti-islanding method for three-phase grid-tied inverters was proposed. The method is based on asymmetric injection of the converter currents at a sub-harmonic frequency, which allows accurate detection of the islanding condition with minimum perturbation to the power system. Theoretical analysis have been confirmed by simulation and experimental tests with a 40kW One-Cycle Control grid tied inverter according to the test procedure outlined in the standard IEEE Std. 1547. The experiments have demonstrated that anti-islanding can be achieved with a negligible perturbation to the power system, where an increase in the THD of the current was observed less than 0.1% at full load.;The second part of the thesis investigates the stability in the presence of high source impedance, develops an impedance based design criterion for stability, and proposes an active damping method. Frequency domain analysis was performed to compare the information provided by the classical feedback control approach with those obtained by the ratio between source and input impedance. Based on these new findings, an active damping method was developed and implemented in a 300W One-Cycle Control DC-DC converter that demonstrated excellent system stability under long cable condition. Simulations and experimental results confirmed the theoretical analysis.
机译：电力电子转换器对于微电网的应用，可再生资源在电力系统中的集成以及有效利用能源的功率调节至关重要。实际上，在调节电源转换器电压时，电源和电源转换器之间的长电缆连接可能会影响系统稳定性。论文的第一部分解决了将可再生能源连接到电表侧的电网的标准合规性问题，即如何检测和处理孤岛状况。提出了一种三相并网逆变器的主动抗孤岛方法。该方法基于在次谐波频率上非对称注入转换器电流，从而可以以最小的扰动对电力系统进行准确的孤岛状态检测。根据标准IEEE Std中概述的测试程序，通过40kW单周期控制并网逆变器的仿真和实验测试已证实了理论分析。 1547.实验证明，对电力系统的扰动可以忽略不计，可以实现反孤岛，在电力系统中，满载时电流的总谐波失真（THD）增大小于0.1％。在高源阻抗的情况下实现稳定性，提出了基于阻抗的稳定性设计标准，并提出了一种主动阻尼方法。进行了频域分析，以将经典反馈控制方法提供的信息与通过源阻抗和输入阻抗之比获得的信息进行比较。基于这些新发现，开发了一种主动阻尼方法，并在300W单周期控制DC-DC转换器中实现了该方法，该方法在长电缆条件下表现出出色的系统稳定性。仿真和实验结果证实了理论分析。

著录项

  • 作者

    Tedde, Marco.;

  • 作者单位

    University of California, Irvine.;

  • 授予单位 University of California, Irvine.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 156 p.
  • 总页数 156
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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