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Reduction of harmonics in grid-connected inverters using variable switching frequency

Affiliation:	1. Faculty of Electrical and Electronics Engineering, Hochiminh City University of Technology and Education, Viet Nam;2. Faculty of Electrical and Electronics Engineering, Hochiminh City University of Technology, Viet Nam;1. Electric Power Research Institute, China Southern Power Grid, Guangzhou 510080, China;2. School of Electrical Engineering, Zhejiang University, Hangzhou 310027, China;3. Institut Teknologi Brunei, Bandar Seri Begawan BE1410, Brunei Darussalam;4. School of Electrical Engineering and Computer Science, Queensland University of Technology, Brisbane, Queensland 4001, Australia;5. State Grid Electric Power Research Institute, Nanjing 210003, China;6. Guangzhou Power Supply Bureau Co., Ltd., Guangzhou 510310, China;1. Laboratoire Paul Painlevé, Université de Lille 1, F-59655 Villeneuve d''Ascq, France;2. ISMMA, Romanian Academy, Bucharest, Romania;1. Institute of Mathematics and Mathematical Modeling, Ministry of Education and Science Republic of Kazakhstan, 050010, Almaty, Kazakhistan;2. Department of Mathematics, Akhmet Yasawi International Kazakh-Turkish University, 161200, Turkistan, Kazakhistan;1. Institute of Applied Mathematics and Mechanics of NAS of Ukraine, G.Batyuka st. 19, 84100 Sloviansk, Ukraine;2. Dipartimento di Matematica, Politecnico di Milano, Via Bonardi 9, 20133 Milano, Italy

Abstract:	The increasing application of distributed power generation into the power system makes grid interconnection requirements of power quality more and more stringent. The reduction of current total harmonic distortion (THD) of grid-connected inverters to achieve the grid code by increasing of switching frequency in PWM of inverters is one of the popular methods, but this increases the switching loss. The aim of this paper is to propose a PWM technique with the function of variable switching cycle to reduce the current harmonics in grid-connected inverters. The weights of this function are determined by using a genetic algorithm under the constraint of constant switching loss. The simulation and experimental results of the proposed technique as well as the conventional constant technique are given and compared, which validate the performance of the proposed technique.

Keywords:	Distributed generation Genetic algorithm PWM inverter Switching loss Total harmonic distortion
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