Development of Compensation Method for Loads With Non-Periodic Currents

该项目将采用混合自适应补偿的概念，对具有非正弦电流的负载进行开发、原型测试和早期报告。根据这一概念，构建了自适应无源补偿器和有源补偿器，前者补偿无功功率并平衡系统，后者补偿负载电流的快速变化分量。在本学科的文献中，这种混合结构被认为是能够克服功率限制，同时保持补偿速度和降低补偿器成本的结构。补偿器采用混合控制算法，即同时在频域和时域进行控制。本研究将开发一种新的控制算法，以补偿具有非周期电流的负载。根据有功和无功功率、均方根值和谐波均方根值，设计和规定了改善功率因数和电能质量的补偿器。必须测量或计算这些值，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，控制将基于时变准功率的概念，在电源电压周期持续时间的时间窗口内测量。该研究是PI对三相非正弦系统的功率现象，测量和补偿研究的延续，并将依赖于理论研究，非周期电流电路的计算机建模和此类电路中的能量流动，以及使用时变负载补偿器的实验室原型进行实验室实验。本项目开发的具有非周期性电流的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，从而减少变速驱动器、工业机器人、电弧炉或焊机的额外成本。非周期电流电路的计算机建模、准功率特性的研究及其在混合补偿器控制算法开发中的应用将有助于电气工程的知识库。该项目的成果将通过出版的报告加以传播。该项目将为两篇硕士论文和一篇博士论文提供课题，从而使三名电气工程师在非周期电流补偿负载方面获得深入的知识和技能。由于路易斯安那州立大学欧洲经委会开设了一门关于电能质量及其改进的新课程，并正在开发一个实验室，因此这项研究开发的原型将用于教育目的。此外，本计划的研究助理将会被雇用，以发展电能品质实验室。所有这些都有助于传播研究成果，并加强对电力质量的教育。此外，将在PES IEEE会议上安排一个关于非周期电流负载及其补偿的小组讨论，以加强该领域专家之间的合作。

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.