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Research on a Transformerless Hybrid Filter Capable of Direct Connection to Medium-Voltage Distribution Systems

一种可直连中压配电系统的无变压器混合滤波器的研究

基本信息

批准号：
18360132
负责人：
AKAGI Hirofumi
金额：
$ 10.43万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18360132/
关键词：
Hybrid filter Supply harmonics Medium-voltage motor Active filter Passive filter Digital control Power conversion

项目摘要

The aim of this research is to develop a hybrid active-passive filter capable of direct connection to medium-voltage utility and industrial power systems without transformers. This hybrid filter is intended for harmonic current compensation of a medium-voltage adjustable-speed motor drive for energy savings in pumps and blowers. Such a motor drive requires no regenerative braking, thus allowing the motor drive to use a three-diode rectifier as the front end. This research leads to the following findings:1. The investigators have done feasibility study and conceptual design of a 6.6-kV transformerless hybrid filter suitable for a motor drive with a three-phase diode rectifier. This hybrid filter is characterized by series connection of a three-phase passive filter tuned In the seventh-harmonic frequency with a three-phase small-rated active filter using a three-level diode-clamped PWM converter without transformer.2. The investigators have achieved theoretical analysis of harmonic curre … More nt mitigation by the hybrid filter, with focus on the required volt-ampere ratings of the passive filter and the active filter Their ratings have a tradeoff in terms of harmonic current mitigation. Computer simulation has been carried out, considering the effects of control delay and the so-called "dead time." The theoretical analysis has been compared with the computer simulation. As a result, the validity of the theoretical analysis has been confirmed, and a limitation of the analysis has been revealed.3. Taking into account the above-mentioned theoretical analysis and computer simulation, the investigators have deigned, constructed and tested a three-phase 400-V 15-kW downscaled system, where a three-level diode-clamped PWM converter has been used for the active filter. What is a major concern in introducing the three-level PWM converter into the hybrid filter is to keep the dc mean voltages of the two split dc capacitors balanced not only in steady states but also in transient states. The investigators have proposed a voltage-balancing control method for the hybrid filter The effectiveness and viability of the method has been verified by the experiments using the 400-V 15-kW system. The current THD (total harmonic distortion) in the supply side was less than 5%, and each harmonic current component was less than 3%, including up to 40-th harmonic components. Both the THD value and harmonic components perfectly meet the Japanese harmonic guidelines.4. Considerations on the 6.6-kV transformerless hybrid filter that will be put into practical use in the near future have been discussed on the basis of the results from the theoretical analysis, computer simulation and experiment. Less

本研究的目的是开发一种混合有源无源滤波器，能够直接连接到中压公用事业和工业电力系统，而无需变压器。该混合滤波器用于中压可调速电机驱动的谐波电流补偿，以节省泵和鼓风机的能源。这种电机驱动器不需要再生制动，因此允许电机驱动器使用三二极管整流器作为前端。本研究得出以下结论：1.研究人员已经做了可行性研究和概念设计的6.6千伏无变压器的混合滤波器，适用于电机驱动与三相二极管整流器。这种混合滤波器的特点是串联的三相无源滤波器调谐在七次谐波频率与三相小额定有源滤波器使用三电平二极管钳位PWM变换器无变压器.研究者对谐波电流进行了理论分析， ...更多信息通过混合滤波器的NT缓解，重点关注无源滤波器和有源滤波器所需的伏安额定值，它们的额定值在谐波电流缓解方面具有折衷。在考虑控制延迟和所谓的“死区时间”的影响下，进行了计算机仿真。“理论分析与计算机模拟进行了比较。验证了理论分析的有效性，同时也揭示了理论分析的局限性.考虑到上述理论分析和计算机仿真，研究人员设计，构建和测试了一个三相400-V 15-kW的缩小系统，其中三电平二极管箝位PWM变换器已被用于有源滤波器。在混合滤波器中引入三电平PWM变换器的一个主要问题是不仅在稳态而且在瞬态保持两个分裂直流电容器的直流平均电压平衡。研究者提出了一种混合滤波器的电压平衡控制方法。该方法的有效性和可行性已通过400 V 15 kW系统的实验验证。电源侧电流总谐波失真小于5%，各次谐波电流分量小于3%，包括40次谐波分量。THD值和谐波分量完全符合日本谐波标准.根据理论分析、计算机模拟和实验结果，讨论了在不久的将来将投入实际应用的6.6kV无变压器混合滤波器的设计思路。少