Abstract-In this study, an alternative control method is proposed to improve the harmonic suppression efficiency of the active power filter in a distorted and unbalanced power system to
As programmable logic controllers (PLC) technology, programming languages and communication capabilities have advanced, PLCs offer many control devices to be attached directly to the PLC. For this reason PLC education became an important issue in many interdisciplinary engineering departments of the Universities. In this paper an automation set for the laboratory of PLC is developed which can be operated in various ways by programming a PLC as desired. The designed set also enables the students to understand the operation principle of an elevator. This developed educational laboratory set can be used as a practice for sensors and actuators, control systems and industrial automation courses. The laboratory tool also provides a method to improve learning outcomes, skills and the real-time experiences in engineering education such as electrical, electronics, mechatronics and control engineering.
In the case of balanced and undistorted supply voltages, shunt APFs can achieve current harmonic cancellation and give unity power factors. However, this is not possible when grid voltage is non-sinusoidal and unbalanced. In this paper, we first show that the harmonic suppression performance of the well-known p-q theory deteriorates in nonideal grid voltage conditions. A technique for alleviating the detrimental effects of a distorted and unbalanced grid voltage is proposed that uses a self-tuning filter with p-q theory. The proposed control technique gives an adequate compensating current reference even for non ideal voltage condition. The results of simulation study are presented to verify the effectiveness of the proposed control technique in this study.
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