Implementation Of ANFIS-Based Dynamic Voltage Restorer To Improve The Voltage Profile of a PV-integrated Grid
Department of Electrical Electronics Engineering, Faculty of Engineering and Natural Sciences, Uskudar University, Istanbul Turkey; *Correspondence: email@example.com; firstname.lastname@example.org
Received: 1/3/2022, First revision: 15/4/2022, Accepted: 15/3/2022, Published: 27/4/2022
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Fluctuations in system voltage can disrupt the system possessions both at the utility and customer end. Such a problem is most prominent at a point where a renewable source is attached to feed the grid. Photovoltaic (PV) power is one of the proposing renewable resources in the twenty-one century. However, its output depends on sunlight which varies throughout the day. This varying output of grid-connected PV systems causes harmonics and variation in system voltage. This work proposes a model of Dynamic Voltage Restorer (DVR) to overcome the issues mentioned above. DVR is a three-phase voltage source inverter (VSI) fed by a DC source. Adaptive neuro-fuzzy inference system(ANFIS) controller along with synchronous reference frame theory (SRF) is used to control the switching of voltage source inverter. According to SRF theory, three-phase a–b–c stationary frames are changed into 0–d-q rotational frames. The 0–d–q rotating frame reference signals are regulated using a PI or ANFIS controller to achieve the necessary reference signals. The measured amplitudes of the reference phase voltages are used directly to calculate the PWM signal generation for the three-phase inverter. MATLAB software is used to implement the proposed model and verify the proposed controller. The DVR is attached to a grid integrated with the PV system. PV system parameters like irradiance and temperature are varied to disturb the voltage. Voltage fluctuations and harmonics generated were mitigated by DVR. The results show that the proposed device can improve the voltage profile of a PV-integrated grid.
Traditional power generation tended to have centralized generating plants along with transmission and distribution networks consisting of long and overloaded lines . Which resulted in serious low voltage problems at the consumer end. This problem was reduced with the introduction of distributed generation (DG) . Which is a decentralized approach defined as the integration of a power generating system within the distribution system. Any of the generator technology can be used in DG. The most common and environment-friendly generating sources are renewable ones. Among these renewable sources, photovoltaic-based generation is prominent. Because of their low costs and zero pollution, PV-based systems have great potential. Equation (1) shows that the power output of the PV system depends on sunlight intensity which varies throughout the day. This varying output of grid-connected PV systems causes harmonics and variation in system voltage. This voltage variation problem is the main challenge of DG . The use of capacitor banks was one of the traditional methods to overcome voltage profile issues. Traditional methods are not sufficient to overcome the issues mentioned above . This work aims to develop a dynamic voltage restorer (DVR) model to improve the voltage profile at the common coupling point of a PV-connected grid.