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A modified FOGI-FLL feature-based control algorithm for single-stage grid-interfaced solar PV system

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Abstract

This paper presents an overview of power quality improvement of the distributed network by using a novel robust control algorithm. The novel robust control algorithm is modified fourth-order generalized integral action with frequency-locked loop feature (Mod.FOGI-FLL) for a three-phase grid-interfaced single-stage solar photovoltaic (PV) system with distribution static compensator capabilities. The functions taken into features for robust control algorithm (Mod.FOGI-FLL) are load balancing, reactive power compensation, power factor correction with active power generation for proposed topology, and behavior of proposed control with different faults at point of common coupling (PCC). The perturb and observe (P&O) algorithm is used to extract maximum power from the PV array under variable atmospheric conditions. To adapt with variation in terminal voltage at the point of common contact (PCC), PV feed-forward term is also added in the control algorithm to make fewer oscillations in grid current. Test results demonstrate satisfactory response for steady-state and dynamic conditions at load unbalancing, variations in insolation level, and fault profile at VSC. The DC rejection capabilities of a proposed control methodology obtained are around 60 decibel which is 22 decibel more than FOGI-FLL techniques with the same gain parameters 38 decibel. The distortion in grid currents and voltages is obtained from MATLAB/SIMULINK within limits IEEE-519 standard.

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Source power versus the time during insolation increase

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source power versus the time (load unbalancing of phase A)

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Source voltage versus the time (load unbalancing of phase A)

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Source power versus the time

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Abbreviations

Mod.FOGI-FLL:

Modified fourth-order generalized integral action with frequency-locked loop

PV:

Solar photovoltaic

D-STATCOM:

Distribution static compensator

PCC:

Point of common coupling

P COP & O algorithm:

Perturb and observe algorithm

COP:

Conference of parties

MSRF:

Modified synchronous reference frame theory

IRPT:

Instantaneous reactive power theory

EPLL:

Enhanced phase-locked loop

FLL:

Frequency-locked loop

SOGI:

Second-order generalized integral

FOGI:

Fourth-order generalized integral

CTF:

Character in triangle function

SOGI-D:

Damped second-order generalized integral

SOGI-Q:

Quadrature second-order generalized integral

V t :

Unit template, the terminal voltage

V sa, V sb, V sc :

Source voltage of a, b, c phases, respectively

u pa, u pb, u pc :

In phase unit template of phases a, b, c, respectively

V DC :

DC bus voltage

V dcref :

Reference DC bus voltage

I pvffd :

PV feed-forward current

I loss :

Converter loss component current

K p, K I :

Gain parameters of PI controller

i 1q :

Quadrature component of fundamental load current

i 1d :

Fundamental component of in-phase load current

i 1 :

Fundamental load current

ω :

Estimated system frequency

i m :

Intermediate signal of controller

ω cr :

Frequency tracking error

θ :

Angle associated with fundamental load current

θ gc :

Angle associated with fundamental quadrature component and error component

θ pc :

Angle associated with fundamental in phase component and error component

e :

Error between reference and actual current for fundamental in phase and fundamental quadrature component

I max :

Maximum fundamental load current

P pv :

PV power

I apeak, I bpeak, I cpeak :

Peak current of a, b, c phases, respectively

I net :

Total net current

I ref_a, I ref_b, I ref_c :

Reference current generation of a, b, c phases, respectively

a 1, a 2, a 3, a :

Constant used for simulation

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Authors and Affiliations

  1. Department of Electrical Engineering, ITER, SOA Deemed To Be University, Bhubaneswar, India

    Subhranshu Sekhar Puhan & Renu Sharma

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  1. Subhranshu Sekhar Puhan
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  2. Renu Sharma
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Correspondence to Renu Sharma.

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Puhan, S.S., Sharma, R. A modified FOGI-FLL feature-based control algorithm for single-stage grid-interfaced solar PV system. Int J Energy Environ Eng 13, 1349–1365 (2022). https://doi.org/10.1007/s40095-022-00487-4

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