Abstract
In this paper, the hybrid photovoltaic-thermoelectric generator (PV-TEG) combined dynamic voltage restorer (DVR) system is proposed for the power quality disturbances compensation in a single-phase distribution system. The stable and precise level of input voltage is essential for the smooth and trouble-free operation of the electrically sensitive loads which are connected at the utility side to avoid system malfunctions. In this context, the hybrid PV-TEG energy module combined DVR system is proposed in this paper. With the support of the hybrid energy module, the DVR will perform the power quality disturbances compensation effectively with needed voltage and /or power. In the proposed system, the PV and TEG energy sources are connected electrically in series to produce adequate voltage for the DVR operation and the fractional factor-based variable incremental conduction (FFVINC) maximum power point tracking (MPPT) control algorithm is employed to extract the possible maximum power from the PV array. The intelligent fuzzy logic controller (FLC) is chosen for implementing the MPPT control algorithm. The half-bridge voltage source inverter (VSI) circuit and in-phase voltage compensation technique are used in the DVR for better power quality disturbances compensation. The performance and usefulness of the proposed DVR system are investigated by an extensive simulation study with four different modes of operation, the study results are confirmed that the proposed system promptly identifies the power quality disturbances for compensation. Moreover, the investigation proved that the combined PV and TEG energy module can provide better energy efficiency in converting solar irradiation into electricity.
Highlights
Nowadays, sensitive electrical and electronic loads are widely used for network communication, computing, safety and monitoring in residential as well as commercial buildings
The study is made with an assumed PV cell temperature of 313 K and the TEG input temperature difference of 20 K, the result confirmed that the PV-TEG energy source can provide sufficient power for the dynamic voltage restorer (DVR) power quality compensation under changing solar irradiation
The reactive power supplied from the utility grid and the DVR during the voltage sag is examined as shown in Fig. 15(b), in the present study model the load is consuming a very small amount of reactive power of 0.3 volt-ampere reactive (VAR)
Summary
Sensitive electrical and electronic loads are widely used for network communication, computing, safety and monitoring in residential as well as commercial buildings. The sensitive loads which are connected in the distribution supply system are mainly affected by the power quality disturbances, which leads to various system malfunctions such as data losses, system halts, communication interference, reducing the life period of the equipment etc. The H-bridge VSI circuit-based DVR with a hybrid PV-TEG renewable energy module is proposed for compensating the power quality disturbances of the sensitive loads connected in a single-phase distribution system. The proposed DVR system is designed that to compensate deep and long-term voltage disturbances by supplying adequate real and reactive power from the PV-TEG hybrid energy source. The simulation study of the proposed DVR system is carried out under various operating modes to demonstrate its effectiveness
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