Abstract
The dynamic voltage restorer (DVR) combined with a photovoltaic–thermoelectric generator (PV-TEG) system is proposed for voltage disturbance compensation in the three-phase four-wire distribution system. The PV-TEG hybrid energy source is used in the DVR system to improve the system ability for deep and long-period power quality disturbance compensation. In addition, the DVR will save grid energy consumption when the hybrid PV-TEG module generates sufficient power to meet the load demand. An enhanced variable factor adaptive fuzzy logic controller (VFAFLC)-based maximum power point tracking (MPPT) control scheme is proposed to extract the maximum possible power from the PV module. Since the PV and TEG combine a hybrid energy source for generating power, the DVR can work efficiently for the voltage sag/swell, outage compensation, and energy conservation mode with minimum energy storage facilities. The in-phase compensation method and the three-leg voltage source inverter (VSI) circuit are chosen in the present system for better voltage and/or power compensation. To confirm the effectiveness of the proposed hybrid PV-TEG integrated DVR system, a simulation-based investigation is carried out with four different operational modes with MATLAB software. The study results confirm that the proposed DVR system can compensate power quality disturbances of the three-phase load with less total harmonics distortion (THD) and will also work efficiently under energy conservation mode to save grid energy consumption. Moreover, the proposed VFAFLC-based control technique performs better to achieve the maximum power point (MPP) quickly and accurately, thereby improving the efficiency of the hybrid energy module.
Highlights
A new system configuration for a photovoltaic–thermoelectric generator (PV-TEG) integrated dynamic voltage restorer (DVR) was proposed to compensate for the power quality disturbances in the three-phase distribution system and conserve the utility grid energy for the consumer
A novel variable factor adaptive fuzzy logic controller (VFAFLC)-based maximum power point tracking (MPPT) control technique was implemented to rapidly extract maximum power from the PV array, which ensured the prompt supply of sufficient voltage and power for the DVR in mitigating deep and long-period power quality disturbances
The variable factor used in the MPPT control algorithm modified the fuzzy input linguistic variable value, which resulted in the maximum power point (MPP)
Summary
Most of the recent electrical and electronic devices used in residential, commercial, and industrial buildings are quite sensitive to power supply quality. When compared to conventional electrical loads, the modern devices that are used for the computing, communication, and monitoring systems in hospitals suffer malfunctions due to the poor power quality in the supply [1,2,3,4]. The voltage fluctuation, harmonics, supply outage, and transients are the major power quality problems that create various issues such as malfunction, overheating, reducing the life of the devices, data losses etc. Voltage disturbances on the utility side, develop due to various reasons such as transmission line faults, distribution transformers, unequal single-phase loads among the three-phase supply system, connecting PV and/or wind power generation systems to the networks, and unequal system impedance [9].
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