An improved low‐voltage ride‐through (LVRT) strategy for PV‐based grid connected inverter using instantaneous power theory

The main objective of this research is to propose an active and reactive power injection control in order to mitigate voltage sags. The proposed control strategy works in conjunction with a modified version of an automatic voltage regulator (AVR), where it will act on the active and reactive powers injected by the inverter to reduce the effects of voltage sags. In this way, the control will avoid possible shutdowns and damage to the equipment connected to the grid. The voltage improvement can be perceived for consumers connected to the power system. Modifications in AVR model and parameters are performed to speed up its performance, thus identifying the short-duration voltage variations (SDVV) and, consequently, the control acts to alter the powers, decreasing the active power injection and increasing the reactive power based on inverter capacity during the momentary voltage dip (MVD). Finally, when the fault is cleared, all values return to the pre-fault condition, so that the inverter only operates with active power. A 75 kW three-phase grid-connected photovoltaic system (GCPVS) equipped with the proposed control was inserted in a distribution grid of the city of Palmas, state of Tocantins, Brazil, and all of the computer simulations were performed on the Matlab/Simulink®.

show abstract

“…Energies 2021, 14, x FOR PEER REVIEW 19 of 24 phase C to 46.24 V during the fault period of 625 ms (duration used by the references [1,9,18,36]).…”

Section: Results and Discussion Of Sdvv/mvd Controlmentioning

confidence: 99%

“…Finally, the average Figure 15 shows the response of the proposed control. When an asymmetric two-phaseto-ground fault occurs, phase A voltage drops to 171.5 V, phase B to 169.1 V, and phase C to 46.24 V during the fault period of 625 ms (duration used by the references [1,9,18,36]).…”

Section: Figure 15mentioning

confidence: 99%

Implementation of a Photovoltaic Inverter with Modified Automatic Voltage Regulator Control Designed to Mitigate Momentary Voltage Dip

et al. 2021

View full text Add to dashboard Cite

show abstract

“…However, the voltage magnitude of point-of-common-coupling (PCC), has not been compensated. Also, the LVRT capability of an LV fuel-cell system is assessed in [20], and a neural-based alongside a fuzzy-based controllers are respectively proposed in [21] and [22], which suffer from a lack of coordinated reactive power-sharing. This problem is the most common issue between papers in this category.…”

Section: Grid-following Based Methodsmentioning

confidence: 99%

Real‐time low/high‐voltage ride‐through capability improvement of micro‐grid based on coordinated robust grid‐following control

Kordkandi

Hagh

Roozbehani

2022

IET Generation Trans & Dist

View full text Add to dashboard Cite

This paper proposes a coordinated control strategy to enhance the low/high-voltage ridethrough (L/HVRT) capability of grid-tied micro-grids (MGs). The novel control scheme, which is based on grid-following concepts, contains two layers for each power source of MG. The former, known as the primary layer, has reverse-droop and non-linear robust sliding mode control. Furthermore, the secondary layer detects voltage perturbations based on L/HVRT curves. Then, the reactive power required for supporting the main grid is determined through the dynamic-voltage-support requirement of the grid codes. Finally, coordinated reactive power-sharing among the sources is performed based on the presented method and free capacity of the power sources. Several case studies are carried out to assess the effectiveness of the proposed control scheme, which points out that the aims of this study, such as compliance with the grid codes, sharing reactive power among the sources, tracking the reactive power precisely and feeding local loads, are achieved. The superiority of the presented strategy against its grid-forming counterparts is demonstrated in comparison tests for the studied grid-tied MG. Simulations are performed in an offline MATLAB/Simulink environment and then validated by experimental real-time results.

show abstract

“…As the characteristics of IIDG are different from the synchronous machine, it is necessary to model the IIDG in fault analysis [7]. On the one hand, the integrated IIDG in the distribution network is under the PQ control strategy [24,25]. P and Q are the IIDG active and reactive powers, respectively, which can determine the IIDG output.…”

Section: Iidg Model Considering Control Strategymentioning

confidence: 99%

Whole‐line fault analysis method for unbalanced distribution networks with inverter interfaced distributed generators

Wang

2022

IET Generation Trans & Dist

View full text Add to dashboard Cite

The integration of the inverter interfaced distributed generators (IIDGs) challenges the conventional fault analysis in distribution networks. However, the existing analysis methods mainly focus on the fault occurring at the network buses and little research has been done to analyse the whole-line faults. To extend the fault analysis methods, this paper proposed a phase domain estimation method. The new method was designed to analyse the whole-line faults in unbalanced distribution networks, considering the control strategy and fault-ride-through (FRT) capability of IIDG. A canonical method was developed and a compensation method was utilised, avoiding constructing the entire bus matrix and predefining the fault boundary conditions. Moreover, the new method is robust and can be used to analyse the simultaneous faults as well. Finally, the proposed method was programmed in MATLAB and different scenarios were tested on an unbalanced network. The calculation results were examined by the simulations, which verified the effectiveness of the new method. The new method can analyse whole-line fault in unbalanced networks with IIDGs connection, extending the current fault analysis methods and providing foundations for relay protection.

show abstract

An improved low‐voltage ride‐through (LVRT) strategy for PV‐based grid connected inverter using instantaneous power theory

Cited by 12 publications

References 39 publications

Implementation of a Photovoltaic Inverter with Modified Automatic Voltage Regulator Control Designed to Mitigate Momentary Voltage Dip

Implementation of a Photovoltaic Inverter with Modified Automatic Voltage Regulator Control Designed to Mitigate Momentary Voltage Dip

Real‐time low/high‐voltage ride‐through capability improvement of micro‐grid based on coordinated robust grid‐following control

Whole‐line fault analysis method for unbalanced distribution networks with inverter interfaced distributed generators

Contact Info

Product

Resources

About