Analysis of High-Efficiency Transformerless Inverter for a Grid-Tied PV Power System with Reactive Power Control

Author(s): Selvamathi Ramachandran, Indragandhi Vairavasundaram*

Journal Name: Recent Advances in Computer Science and Communications
Formerly Recent Patents on Computer Science

Volume 14 , Issue 2 , 2021


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Abstract:

Background: In recent days grid-tied PV power systems play a vital role in the entire energy system. In a grid –tied PV system Transformerless Inverter (TI) topologies are preferred for its reduced price, improved efficiency, lightweight etc. Therefore many transformerless topologies have been proposed and verified with real power injection only. Recently, almost every international standard has imposed that a specified amount of reactive power should be handled by the grid-tied PV inverter. According to the standard VDE-AR-N4105, grid-tied PV inverter of power rating below 3.68kVA, should attain Power Factor (PF) from 0.95 leading to 0.95 lagging.

Objective: To address this issue of grid-tied PV system with reactive power control, in this paper Fuzzy gain scheduling controller is proposed as a power controller for High Efficiency Transformeless (HETL) inverter. The performance of the proposed scheme is analyzed and validated with the comparison of a conventional PI controller based active and reactive power controllers.

Methods: This paper is with the intention of improvement in the performance of the system, the FGS controller is anticipated as active and reactive power controllers. In conventional PI controller gains are constant for any value of the error, which makes error and delay in optimum value of voltage (Vα and Vß). Hence in this analysis FGS controller tunes PI controller gain with respect to change in active and reactive power error.

Results: Comparative performance of PI and FGS based HETL inverter is presented in this paper. It is noted that for any cases either Pref is constant or variable the FGS reduces ripple than PI based HETL inverter system. Compare to constant reference power case variable reference case produces more ripples in both systems.

Conclusion: From the analysis FGS based HETL inverter in a grid-tied PV based power system produces the best performance in all aspects such as voltage, active power and reactive power.

Keywords: Fuzzy controller, grid-tied PV, HETL inverter, Proportional-Resonant (PR) controller, reactive power control, transformerless inverter.

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Article Details

VOLUME: 14
ISSUE: 2
Year: 2021
Published on: 20 May, 2021
Page: [540 - 554]
Pages: 15
DOI: 10.2174/2213275911666190320161342
Price: $25

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