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

ECS-9616018 Mohan应用中，电压骤降是过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、可调速驱动器、机器人等的现代工业工厂中，即使是瞬间的电压骤降也会扰乱自动化过程，导致产品和生产时间的损失，并且需要清理和重新校准以重新启动该过程。 在电压骤降期间，通过快速动作的固态电压调节器可以保持电能质量，该固态电压调节器串联注入电压以补偿相电压中的骤降。 虽然比不间断电源更便宜，在停电期间完成备份，电压调节器的成本限制了它们的应用。 目的，本研究的目的是研究一种基于高频隔离周波变换器的新型电压调节器，该电压调节器在成本、效率、尺寸和重量方面具有优势。更重要的是，本研究旨在建立一个全新的电力电子变换器方向，用于更大的功率和电压额定值，其中具有高频链路的标准模块可以串联和并联连接，消除了昂贵和有损耗的工频变压器。 这些在电力系统中有许多潜在的应用：无功补偿使用（STATCOM），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，等等。 方法，提出了一种新型高频环节电压调节器。 它由一个逆变器组成，用于所有三相。 每相都有自己的高频Transformer和循环换流器。 为了降低Transformer的漏感，将研究同轴设计和各种磁芯材料，如非晶合金和铁氧体。 潜在的好处，所提出的方法的成功可能是朝着减轻电压骤降的有害影响迈出的重要一步。 这项研究的成功也可能导致在许多电力系统应用中消除工频变压器。 建议的研究任务，这是建议分析和评估高频链电压调节器。 各种开关方案，Transformer设计，如同轴变压器，和磁性材料，如非晶合金和铁氧体将被检查。 将在实验室中建造一个三相原型，额定值为7.5 kVA。 将评估其扩展到其他应用程序。 知识和技术的进步，由于所提出的使用同轴高频变压器和新磁性材料的高频链路的组合是新颖的，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.