Grid interface of solar PV transformer-less inverters using enhanced phase locked loop
1 Department of EEE, CVR College of Engineering, JNTUH, India.
2 EEE Department KIOT, Wollo university, Ethiopia.
3 JNT Sultanpur, JNTU Hyderabad, INDIA.
Research Article
Global Journal of Engineering and Technology Advances, 2022, 11(03), 052–058.
Article DOI: 10.30574/gjeta.2022.11.3.0095
Publication history:
Received on 13 May 2022; revised on 18 June 2022; accepted on 20 June 2022
Abstract:
The era of Renewable Energy sources has overtaken the usage of conventional energy sources like coal, fossil fuels etc. This paper presents grid interface of single phase transformerless inverter system using enhanced phase locked loop. To connect solar PV with grid it is required to estimate phase angle, voltage amplitude and phase angle measurement of grid and the output of inverter. It is required to track exact utility voltage vector for reliable control of power to the grid. This paper compares the frequency measurement and phase angle and voltage amplitude using simple phase locked loop system along with enhanced phase locked loop so that the enhanced phase locked loop (EPLL) is proved to be giving superior performance over simple phase locked loop. The simulation of both the techniques are pursued and the results are compared.
Keywords:
Phase angle Measurement; Enhanced Phase locked Loop; Transformerless inverter; Solar PV transformer
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