Modeling and control of three-phase grid-connected photovoltaic inverter

Ma, Liang; Wang, Ran; Zheng, Trillion Q.

doi:10.1109/icca.2010.5524330

Cited by 10 publications

(7 citation statements)

References 11 publications

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“…The gains from the PI controller were selected using Equations (21) and (22). The modelling and derivation of Equations (21) and (22) are similar to the referenced ones [24]. The other assumed parameters such as boost converter capacitor and switching frequency values are 3500 μF, and 4.5 kHz, respectively.…”

Section: Voltage Control Loopmentioning

confidence: 99%

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Investigation of Photovoltaic Grid System under Non-Uniform Irradiance Conditions

2020

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Photovoltaic (PV) systems have recently been recognized as a leading way in the production of renewable electricity. Due to the unpredictable changes in environmental patterns, the amount of solar irradiation and cell operating temperature affect the power generated by the PV system. This paper, therefore, discusses the grid-integrated PV system to extract maximum power from the PV array to supply load requirements and the supply surplus power to the AC grid. The primary design is to have maximum power point tracking (MPPT) of the non-uniformly irradiated PV array, conversion efficiency maximization, and grid synchronization. This paper investigates various MPPT control algorithms using incremental conductance method, which effectively increased the performance and reduced error, hence helped to extract solar array’s power more efficiently. Additionally, other issues of PV grid-connected system such as network stability, power quality, and grid synchronization functions were implemented. The control of the voltage source converter is designed in such a way that PV power generated is synchronous to the grid. This paper also includes a comparative analysis of two MPPT techniques such as incremental conductance (INC) and perturb-and-observe (P&O). Extensive simulation of various controllers has been conducted to achieve enhanced efficient power extraction, grid synchronization and minimal performance loss due to dynamic tracking errors, particularly under fast-changing irradiation in Matlab/Simulink. The overall results favour INC algorithm and meet the required standards.

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Section: Voltage Control Loopmentioning

confidence: 99%

“…Electronics 2020, 9, x FOR PEER REVIEW 2 of 24 systems have recently been recognized as a leading way in the production of renewable electricity. This can produce direct energy when exposed to solar radiation without any environmental effects of pollution.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Photovoltaic Grid System under Non-Uniform Irradiance Conditions

2020

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“…5. The two switches in same arm should never be turned "ON" simultaneously as it would lead to short circuiting of the voltage source.The DC link capacitor connects the DC-DC converters output DC power to the inverter [17][18]. A high capacitance value of DC link capacitor is selected to stabilize the DC voltage.…”

Section: Dc-ac Convertermentioning

confidence: 99%

A Novel Voltage Regulation Technique using Fractional Order PI Controller for A Three Phase Grid Connected Photovoltaic System

Kumar¹,

Salma²

2019

IJRTE

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The integration of distributed generations (DG’s) to the grid has led to number of challenges apart from the advantages, one of the challenge associated is the voltage regulation. Photovoltaic (PV) system as a DG is considered as it has a better edge when compared to the other DG’s. The application of PV system to the grid requires extra compensating devices to mitigate the voltage regulation issues. A novel voltage regulation strategy for three phase grid connected PV system using fractional order proportional plus integral (FOPI) controller is proposed in this paper. The modelling&analysis of FOPI controller along with the integer orderproportional plus integral (IOPI) controlleris presented in this paper. FOPI controllers are designed in Matlab using FOMCON toolbox (Fractional order Modeling and Control).The simulation is consequently carried out in the Matlab/Simulink environment for both the controllers with resistive loads, resistive & inductive loadsand resistive, inductive & capacitive loads.The FOPI controller outperforms IOPI controller, results of simulation reflectthat controller using FOPI gives better performancewhen compared with the IOPI controller. The effectiveness ofthe FOPI controller confirms the authentication and the simulation results are deliberated for all the different loads.

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“…2b. A closed-loop transfer function of the current control loop can be obtained as (13) which is assumed to cause a delay of 4T s [18]. By taking 4T s , the voltage control loop is designed to be four times slower than the current control…”

Section: Dc-link Voltage Control Loopmentioning

confidence: 99%

“…2 b . A closed‐loop transfer function of the current control loop can be obtained as (13) which is assumed to cause a delay of

4 T_{s}

[18]. By taking

4 T_{s}

, the voltage control loop is designed to be four times slower than the current control

G_{cv loop} false(s false) = \frac{1}{4 T_{s} s + 1}

The open‐loop transfer function for voltage control is a type 2 system as described in and optimum symmetry criterion, in this case, would not give enough phase margin

G_{dc open} false(s false) = \frac{h K ()(, s + ω_{1})}{()(, s + ω_{2})} = \frac{K_{vP} K_{dc} (τ_{normalv} s + 1)}{τ_{normalv} s^{2} (4 T_{normals} s + 1)}

Therefore, gain parameters of the PI controller are found using type 2 system compensation.…”

Section: Control Structure Design For Gcpvsmentioning

confidence: 99%

Integral sliding mode‐improved adaptive MPPT control scheme for suppressing grid current harmonics for PV system

Pahari

Subudhi

2018

IET Renewable Power Generation

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This study proposes a new control scheme for grid integration of a three-phase two-stage photovoltaic (PV) system by employing an integral sliding mode current control loop and an improved adaptive maximum power point tracking (MPPT) algorithm. Integral sliding mode control (ISMC) offers fast control action and is insensitive to plant parametric uncertainties. In a grid-connected PV system, ISMC suffers from steady-state error in tracking reference grid current signal due to disturbances in the dc-link voltage caused by the MPPT. To improve the performance of the ISMC, the authors propose a direct duty ratio control-based variable step size perturb and observe (P&O) MPPT algorithm for reducing the oscillations in the dc-link voltage. The efficacy of the proposed control scheme is verified by first simulating it using MATLAB/Simulink and then through real-time implementation on a prototype PV control setup. To evaluate the performance of this ISMC-improved adaptive P&O-based controller, its performance is compared with Lagrangian interpolation-based particle swarm optimisation MPPT, sliding mode controller and proportional-integral controller. From the comparison, it is observed that the former exhibits superior performance and suppresses the harmonic content in the grid current despite the presence of low-order harmonics in the utility grid voltage.

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Modeling and control of three-phase grid-connected photovoltaic inverter

Cited by 10 publications

References 11 publications

Investigation of Photovoltaic Grid System under Non-Uniform Irradiance Conditions

Investigation of Photovoltaic Grid System under Non-Uniform Irradiance Conditions

A Novel Voltage Regulation Technique using Fractional Order PI Controller for A Three Phase Grid Connected Photovoltaic System

Integral sliding mode‐improved adaptive MPPT control scheme for suppressing grid current harmonics for PV system

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