Researchers invent a technique to regulate voltage variations in solar + storage systems

New technology enhances the operational stability of the system under different conditions

Haryana (Natural Energy News): Researchers at the National Institute of Technology Kurukshetra claim to have developed a new method for regulating direct current (DC) voltage for grid-connected solar photovoltaic plus battery energy storage (SPV-BES) systems.

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Researchers reported that power system engineers faced many technical challenges due to the high penetration of renewable energy in distributed systems. The voltage level increases due to the active power supply from the voltage to the distribution system. This issue becomes serious when solar power generation is at its peak during the day.

The researchers developed a new technique for the coordinated regulation of active and reactive power compensation of grid-connected solar plus battery storage. They used a curve fitting toolbox in Simulink (graphical programming for simulation) to derive the controller equation for the new DC voltage regulator. To verify the effectiveness of the proposed system, the researchers simulated changes in solar radiation and load changes.

The researchers integrated the Maximum Power Point Tracking (MPPT) algorithm into the control setup to eject peak power output from solar at any time under variable operating conditions. The battery will be charged if solar radiation exceeds a particular value decided by the voltage measurement of the SPV. It will discharge when the solar system cannot supply the load due to low solar radiation because the converter allows energy to flow in both directions.

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The researchers connected the DC structure to the solar system with a DC link capacitor through the DC link and coupled the BES to the DC link capacitor via a buck-boosted DC converter to develop the control structure. They used a DC to AC converter to connect the AC side at the point of common coupling (PCC) and the DC side of the structure with coupled variable AC loads.

“The control structure measures the PCC as well as the load on the grid-side and the voltage on the SPV-BES side. The controllers are fed to the energy flow management, ”the researchers said.

The researchers remarked that the control system stimulates the SPV-BES system to provide active power and compensate for reactive power at the juncture of common joining. He stated that the control structure also used the ability of a hybrid system to compensate for reactive power to increase system stability and power parity.

Last month, two researchers from the Indian Institute of Technology (IIT) Kanpur claimed to make sub-modules from organic photovoltaic cells on a paper substrate.

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Recently, researchers at the University of TU Graz claimed that they have developed a redox flow battery that uses conventional vanillin instead of liquid electrolyte, which can make the battery more environmentally friendly. Redox flux batteries are electrochemical energy storage appliances that transform chemical energy into electrical energy by reversible oxidation and depletion of working fluids.

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