Development of Compensation Method for Loads With Non-Periodic Currents

非周期电流负载补偿方法的研制

• 批准号: 9810167
• 负责人: Leszek Czarnecki
• 金额: $ 12.65万
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-09-01 至 2000-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9810167&HistoricalAwards=false
• 关键词: Development; Compensation; Method; Loads; Non

ECS-9810167 Czarnecki The project will employ the concept of a hybrid adaptive compensation for loads with nonsinusoidal currents developed, tested on prototypes and reported earlier. According to this concept, a compensator is built of an adaptive passive compensator, which compensates the reactive power and balances the system, and an active compensator, which compensates fast varying components of the load current. Such a hybrid structure is considered in the literature of the subject as the structure that could overcome power limitations while keeping compensation speed and reduce the cost of the compensator. The compensator is controlled by a hybrid algorithm, i.e., at the same time, in the frequency-,and in time-domain. A new control algorithm that will enable compensation of loads with non-periodic currents will be developed in this research project. Compensators for improving power factor and power quality are designed and specified in terms of active and reactive powers, rms values and harmonic rms values. These values have to be measured or calculated to provide input data for the compensator control. However, these quantities are not defined in systems with non-periodic waveforms. Therefore, the control will be based on a concept of time-varying quasi-powers measured over a time window of the duration of the supply voltage period. The research is a continuation of the PI's studies on power phenomena, measurements and compensation in three-phase nonsinusoidal systems and will rely on theoretical studies, computer modeling of circuits with non-periodic currents and energy flow in such circuits, as well as on laboratory experiments with laboratory prototype of a compensator of time-variant loads. Methods of compensation of loads with non-periodic currents developed in this project will contribute to more effective use of electric energy, to reduction of disturbances and increased reliability of equipment, and thus to reduction of extra cost involved with the supply of variable speed drives, industrial robots, arc furnaces or welders. Computer modeling of circuits with non-periodic currents, studies on properties of quasi-powers and their use in developing the control algorithm of a hybrid compensator will contribute to the knowledge base of electrical engineering. The results of this project will be disseminated through published reports. This project will provide the subjects for two M.Sc. and for one Ph.D. theses, thus three electrical engineers will acquire a deep knowledge and skill in compensating loads with non-periodic currents. Since a new course on power quality and its improvement was initiated at the ECE Dept. at LSU, with a laboratory under development, the prototype developed in this research will be used for education purposes. Also, Research Assistants in this project will be employed next in the development of the Power Quality Lab. All of this will contribute to dissemination of the research results, as well to enhancement of education on power quality. Moreover, the arrangement of a panel discussion at the PES IEEE Meeting on loads with nonperiodic currents and their compensation will be initiated to enhance a partnership between experts in this area.

ECS-9810167查尔内基该项目将采用混合自适应补偿的概念，用于开发、在原型上测试和之前报道的非正弦电流负载。根据这一概念，补偿器由自适应无源补偿器和有源补偿器组成，前者用于补偿无功功率并平衡系统，后者用于补偿快速变化的负载电流分量。在本课题的文献中，这种混合结构被认为是一种能够在保持补偿速度的同时克服功率限制并降低补偿器成本的结构。补偿器由一种混合算法控制，即同时在频域和时间域控制。在本研究项目中，将开发一种新的控制算法，以实现对非周期电流负载的补偿。为提高功率因数和电能质量设计了补偿器，并根据有功功率和无功功率、均方根值和谐波均方根值进行了规定。必须测量或计算这些值，以便为补偿器控制提供输入数据。然而，这些量在具有非周期波形的系统中没有定义。因此，控制将基于在电源电压周期的持续时间窗口内测量的时变准功率的概念。这项研究是PI对三相非正弦系统功率现象、测量和补偿研究的继续，将依赖于理论研究、非周期电流电路的计算机建模和这类电路中的能量流动，以及基于实验室样机的时变负载补偿器的实验室实验。本项目开发的非周期电流负载补偿方法将有助于更有效地利用电能，减少干扰，提高设备的可靠性，从而减少与变速驱动器、工业机器人、电弧炉或焊接机供应有关的额外成本。非周期电流电路的计算机建模、准功率特性的研究及其在开发混合补偿器控制算法中的应用，将有助于电气工程知识库的建立。该项目的成果将通过出版的报告进行传播。该项目将提供两个硕士学位的主题。对于一篇博士论文，三名电气工程师将获得补偿非周期电流负载的深厚知识和技能。因为在欧洲经委会司开办了关于电能质量及其改进的新课程。在路易斯安那州立大学，实验室正在开发中，这项研究开发的原型将用于教育目的。此外，该项目的研究助理将在下一步电能质量实验室的开发中使用。所有这些都将有助于研究成果的传播，以及加强电能质量教育。此外，将在PES IEEE会议上安排一次关于非周期电流负荷及其补偿的小组讨论，以加强这一领域专家之间的伙伴关系。