Asymmetrical Grid Fault Ride-Through Strategy of Three-Phase Grid-Connected Inverter Considering Network Impedance Impact in Low-Voltage Grid

Guo, Xiaoqiang; Xue, Zhang; Wang, Baocheng; Wu, Weiyang; Guerrero, Josep M.

doi:10.1109/tpel.2013.2278030

Cited by 101 publications

(63 citation statements)

References 21 publications

(25 reference statements)

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“…By adding to this issue the dynamic performance of the phase-locked loop (PLL) required for the synchronisation, which plays an important role especially under grid faults [37], the complexity of the closedloop system is significantly increased. This is the main reason for implementing control structures that can operate under grid fault conditions without a PLL, as it has been recently reported in [12], [38].…”

Section: Introductionmentioning

confidence: 95%

PLL-Less Nonlinear Current-Limiting Controller for Single-Phase Grid-Tied Inverters: Design, Stability Analysis, and Operation Under Grid Faults

Konstantopoulos

Zhong

Ming

2016

IEEE Trans. Ind. Electron.

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Abstract-A nonlinear controller for single-phase grid-tied inverters, that can operate under both a normal and a faulty grid with guaranteed closed-loop stability, is proposed. The proposed controller acts independently from the system parameters, does not require a phase-locked loop (PLL) and can achieve the desired real power regulation and unity power factor operation. Based on nonlinear input-to-state stability theory, it is analytically proven that the inverter current always remains below a given value, even during transients, independently from grid variations or faults (short circuit or voltage sag). The desired performance and stability of the closed-loop system are rigorously proven since the controller has a structure that does not require any switches, additional limiters or monitoring devices for its implementation. Therefore, nonlinear stability of a grid-tied inverter with a given current-limiting property is proven for both normal and faulty grid conditions. The effectiveness of the proposed approach is experimentally verified under different operating conditions of the grid.

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Section: Introductionmentioning

confidence: 95%

PLL-Less Nonlinear Current-Limiting Controller for Single-Phase Grid-Tied Inverters: Design, Stability Analysis, and Operation Under Grid Faults

Konstantopoulos

Zhong

Ming

2016

IEEE Trans. Ind. Electron.

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“…The requirements are different regarding a fault duration and the injection quantity of the reactive power depending on the voltage drop ratio. This requirement ensures that the system connected to the grid operates properly when the grid voltage drops [12][13][14][15][16][17][18]. The LVRT requirement contributes to the recovery of the grid voltage by supplying the reactive current in the designated voltage range.…”

Section: Introductionmentioning

confidence: 99%

Low-Voltage Ride-Through Control Strategy for a Grid-Connected Energy Storage System

Bak

Lee

2018

Applied Sciences

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This paper presents a low-voltage ride-through (LVRT) control strategy for grid-connected energy storage systems (ESSs). In the past, researchers have investigated the LVRT control strategies to apply them to wind power generation (WPG) and solar energy generation (SEG) systems. Regardless of the energy source, the main purpose of the LVRT control strategies is to inject reactive power into the grid depending on the grid-code regulations using the grid-side inverter; the proposed LVRT control strategy for grid-connected ESSs also has the same purpose. However, unlike the WPG and SEG systems having unidirectional power flow, grid-connected ESSs have a bidirectional power flow. Therefore, the charging condition of the grid-connected ESSs should be considered for the LVRT control strategy. The proposed LVRT control strategy for grid-connected ESSs determines the injection quantity of the active and reactive currents, and the strategy depends on the voltage drop ratio of the three-phase grid. Additionally, in this paper, we analyzed the variations of the point of common coupling (PCC) voltage depending on the phase of the reactive current during the charging and discharging conditions. The validity of the proposed LVRT control strategy is verified and the variations of the PCC voltage of the grid-connected ESS are analyzed by simulation and experimental results.

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“…Thus, grid codes and standards propose different protocols for DGS during disturbances, mainly related to low-voltage ride-through (LVRT) and reactive current injection (RCI) [5,6]. In grid codes, the stringent requirements on LVRT and RCI during voltage sags [9] are a promising and profitable research field that must be taken into account [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

A Flexible Experimental Laboratory for Distributed Generation Networks Based on Power Inverters

et al. 2017

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Abstract:In the recently deregulated electricity market, distributed generation based on renewable sources is becoming more and more relevant. In this area, two main distributed scenarios are focusing the attention of recent research: grid-connected mode, where the generation sources are connected to a grid mainly supplied by big power plants, and islanded mode, where the distributed sources, energy storage devices, and loads compose an autonomous entity that in its general form can be named a microgrid. To conduct a successful research in these two scenarios, it is essential to have a flexible experimental setup. This work deals with the description of a real laboratory setup composed of four nodes that can emulate both scenarios of a distributed generation network. A comprehensive description of the hardware and software setup will be done, focusing especially in the dual-core DSP used for control purposes, which is next to the industry standards and able to emulate real complexities. A complete experimental section will show the main features of the system.

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Asymmetrical Grid Fault Ride-Through Strategy of Three-Phase Grid-Connected Inverter Considering Network Impedance Impact in Low-Voltage Grid

Cited by 101 publications

References 21 publications

PLL-Less Nonlinear Current-Limiting Controller for Single-Phase Grid-Tied Inverters: Design, Stability Analysis, and Operation Under Grid Faults

PLL-Less Nonlinear Current-Limiting Controller for Single-Phase Grid-Tied Inverters: Design, Stability Analysis, and Operation Under Grid Faults

Low-Voltage Ride-Through Control Strategy for a Grid-Connected Energy Storage System

A Flexible Experimental Laboratory for Distributed Generation Networks Based on Power Inverters

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