Journal
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
Volume 57, Issue 2, Pages 1303-1313Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIA.2021.3051114
Keywords
Voltage control; Power harmonic filters; Power quality; Harmonic analysis; Band-pass filters; Reactive power; Estimation; Maximum power point (MPP) tracking; power quality; single-stage photovoltaic (PV) system; weak grid integration
Funding
- Department of Science and Technology, Government of India
- UKICERI [RP03391]
- J. C. Bose Fellowship [RP03128]
- FIST Project [RP03195]
- INDO-US Project [RP03443]
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The SECS is able to integrate into a weak distribution network and maintain power quality while achieving grid integration and maximum power point operation of the PV array under various complex operating conditions.
A three-phase single-stage solar energy conversion system (SECS) integrated into a weak distribution network is presented. The grid integration and maximum power point operation of the photovoltaic (PV) array are achieved by a voltage source converter. The SECS is capable of feeding distortion-free and balanced grid currents with power factor correction, even at adverse grid side, PV array side, and load side operating conditions. The integration of SECS into the weak grid having distorted, unbalanced, and varying grid voltages is achieved while maintaining the power quality. The dc offset introduced in the sensed grid voltages is also effectively eliminated. For swift system response to changes in load currents, their fundamental weights are swiftly extracted. In the absence of solar irradiance, the power is imported from the utility to supply the local loads, and the system continues to execute its power quality improvement functions. In case of loss of PV power or large voltage deviations, the dc-link voltage is adaptively varied according to the grid voltage changes, increasing system reliability, and reducing operating losses. The efficacy of the SECS is validated through test results at different operating scenarios.
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