Abstract
The main challenge in today's power system is to supply continuous, reliable power and satisfy the high demand. The incorporation of renewable energy sources into the utility grid system can be accomplished. However, the renewable sources are intermittent in nature and the loads work dynamically and cause imbalances to the system voltage within an immediate time. Intermittent renewable sources affect the voltage of the power grid system. Photovoltaic (PV) power generation with Z-source inverter (ZSI)-based dynamic voltage restorer (DVR) is used to avoid that. For step-up low DC voltage to required AC voltage for the compensation of the voltage disturbance, ZSI with the energy storage impedance network is used. DC-DC converters connect the PV cell and the battery storage to the impedance source network. This article also incorporates an upgraded second-order generalized integrator (U-SOGI) control system for the generation of reference voltage signals. The U-SOGI control reference voltage generation approach greatly improves system performance and decreases the harmonic voltage. The voltage-related problems in the system connected to the utility grid are mitigated with DVR. In different load and source conditions, the PV generation with DVR performance is verified by the digital simulation and experimental prototype.
Highlights
IntroductionThe cost-effective dynamic voltage restorer (DVR) is the most attractive among customer power devices and provides the solution for solving voltage-related problems [9,10]
The electricity demand for loads has increased every day in India, due to technological advancement, population growth, and industry growth
The control algorithm based on upgraded second-order generalized integrator (U-SOGI) is shown in Figure 6 is used to filter off harmonic load current components and extract the basic component for dynamic voltage restorer (DVR) switching pulse generation
Summary
The cost-effective DVR is the most attractive among customer power devices and provides the solution for solving voltage-related problems [9,10]. To protect the sensitive load, DVR with a self-tuned fuzzy-PI controller is provided to maximize the power flow with improved power factor [12]. The DVR does not need a separate source to restore system voltage in the proposed PV generating system with a battery storage unit. The DVR with PV power generation holds the load voltage, DC-link voltage, and grid voltage stable. The DVR should be supplied with sufficient DClink power, to protect the sensitive load, rather than with a separate source via a voltage source converter. The DC-link of DVR in this setup again relies upon the voltage of the power supply and cannot be stable to compensate for the line voltage.
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