Maintaining Power Quality During Voltage Sags, Using A NovelHigh-Frequency-Link Voltage Regulator

ECS-9616018莫汉应用中，电压跌落是流程工业面临的最重要的电能质量问题。在使用过程控制计算机、变速驱动器、机器人等的现代工业工厂中，即使是瞬间的电压下降也会扰乱自动化过程，导致产品和生产时间损失，需要清理和重新校准才能重新启动过程。在电压凹陷期间，可以通过快速作用的固态电压调节器串联注入电压来补偿相电压的凹陷，从而保持电能质量。虽然比停电时完全备用的不可干扰电源便宜，但电压调节器的成本限制了它们的应用。本研究的目的是研究一种在成本、效率、体积和重量等方面具有优势的基于高频隔离交交变流器的新型电压调节器。更重要的是，这项研究旨在为更大功率和额定电压的电力电子变流器开辟一个全新的方向，其中具有高频链接的标准模块可以串联和并联，从而消除昂贵和有损的线频变压器。它们在电力系统中有许多潜在的应用：利用静止无功补偿器(STATCOM)进行无功补偿，有源滤波器，光伏、风电和燃料电池系统的互联，电池和超导储能系统的互联等。方法，提出了一种新型高频环节稳压电源。它由一个用于所有三相的逆变器组成。每相都有自己的高频变压器和一个交交变流器。为了减少变压器漏感，将研究同轴设计和各种磁芯材料，如非晶态合金和铁氧体。除了潜在的好处，拟议方法的成功可能是朝着减轻电压凹陷的有害影响迈出的重要一步。这项研究的进展也可能为在众多电力系统应用中消除工频变压器开辟道路。在提出研究任务的基础上，提出了对基于高频环节的电压调节器进行分析和评估。将研究各种开关方案、变压器设计(如同轴变压器)以及磁性材料(如非晶态合金和铁氧体)。将在实验室中建造一台额定为7.5kVA的三相样机。将评估其扩展到其他应用程序的情况。随着知识和技术的进步，由于使用同轴高频变压器和新的磁性材料的高频链路的拟议组合是新颖的，新的发现是完全可能的，这将有利于其他应用。

ECS-9616018 Mohan Applications, Voltage sags are the most important power quality problems facing the process industry. In modern industrial plants using process-control computers, adjustable-speed drives, robotics, etc., even momentary voltage sags can upset automated processes, resulting in loss of product and production time, and requiring cleanup and recalibration to restart the process. The power quality can be maintained during voltage sags by fast-acting, solid-state voltage regulators which inject a voltage in series to compensate for the sag in the phase voltage. Although cheaper than uninturruptible power supplies complete backup during power outages, the cost of voltage regulators have limited their application. Objective, The objective of the proposed research is to investigate a novel voltage regulator based on highfrequency-isolated cycloconverters which excels in the areas of cost, efficiency, size and weigh More importantly, this research seeks to establish an entirely new direction in power electronic converters for larger power and voltage ratings, where standard modules with a high-frequency link can be connected in series and parallel, eliminating costly and lossy line-frequency transformers. These have numerous potential applications in power systems: reactive power compensation using (STATCOM), active filters, interconnection of photovoltaic, wind electric, and fuel-cell systems, interconnection of battery and superconducting energy storage systems, and so on. Method, A novel voltage regulator with a high-frequency link is proposed. It consists of a single inverter for all three phases. Each phase has its own high-frequency transformer and a cycloconverter. For reducing transformer leakage inductances, a co-axial design and various magnetic core materials such as amorphous alloys and ferrites will be examined. Potential Benefits, Success of the proposed approach could be a significant step towards mitigating the deleterious effects of voltage sags. The su ccess of this research could also lead the way to eliminate line-frequency transformers in numerous power system applications. Proposed Research Tasks, It is proposed to analyze and evaluate high-frequency-link based voltage regulators. Various switching schemes, transformer designs such as co-axial transformers, and magnetic materials such as amorphous alloys and ferrites will be examined. A three-phase prototype will be built in the laboratory with a rating of 7.5 kVA. Its extension to other applications will be evaluated. Advancement of Knowledge and Technology, Since the proposed combination of the high frequency link using co-axial, high frequency transformers and new magnetic materials is novel, new discoveries are entirely possible which will be beneficial to other applications.