Synchronous Power Control of Grid-Connected Power Converters under Asymmetrical Grid Fault

Zhang, Weiyi; Rocabert, Joan; Candela, José Ignacio; Rodríguez, Pedro

doi:10.3390/en10070950

Cited by 24 publications

(17 citation statements)

References 28 publications

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“…The virtual admittance components are then selected from the trade-off between power decoupling and synchronous resonance damping, where their values are chosen based on the physical characteristics of SG. The virtual admittance is selected to be 30% and virtual resistance 10% of the nominal power [20].…”

Section: Power Flowmentioning

confidence: 99%

Improved auto‐synchronisation of grid‐connected PV inverter based on the DC capacitor voltage control

Antoine

Zheng

2020

IET Renewable Power Generation

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Based on inherent dynamics similarity between synchronous generator (SG) and DC capacitor power port, this study proposes an improved synchronisation control method of grid-connected PV inverter based on DC capacitor voltage control where a DC-link capacitor voltage is regulated to provide the synchronisation angle. The proposed control method uses the estimated grid angle feedforward to improve the damping performance of the system under disturbances. To assess the robustness of the proposed control method, a two-step procedure is followed. Firstly, a reduced-order model of the system was derived. Secondly, the performance and stability of the proposed control method were fully investigated through the eigenvalue analysis. The offline simulations and real-time simulations are carried in PLECS software and PLECS RT Box, respectively in order to validate and demonstrate the effectiveness of the proposed control method. It has been found that the proposed control method yields a large band controller parameter setting while maintaining system stability. The results showed that the proposed method improved the operating capability and enhanced the performance of the system under disturbances and weak grid operation.

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Section: Power Flowmentioning

confidence: 99%

Improved auto‐synchronisation of grid‐connected PV inverter based on the DC capacitor voltage control

Antoine

Zheng

2020

IET Renewable Power Generation

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“…Finally, the dynamic nonlinear models are based on a polytopic approach, where local models around different equilibrium points are integrated in a nonlinear structure [17][18][19][20][21]. The focus of these models is on the small and large signal behavior of the converters under normal operation, short-circuit fault models [22][23][24] are out of the scope of this work.…”

Section: Introductionmentioning

confidence: 99%

Blackbox Large-Signal Modeling of Grid-Connected DC-AC Electronic Power Converters

et al. 2019

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Modern electric power distribution systems are progressively integrating electronic power converters. However, the design of electronic-power-converter-based systems is not a straightforward task, as the interactions among the different converters can lead to dynamic degradation or instabilities. In addition, electric power distribution systems are expected to consist of commercial-off-the-shelf converters, which implies limited information about the dynamic behavior of the devices. Large-signal blackbox modeling approaches have been proposed in order to obtain accurate dynamic models of commercial converters that can be used for system-level analyses. However, most of the works are focused on DC-DC converters. In this work, a large-signal blackbox model is proposed to model grid-connected three-phase DC-AC converters. An experimental setup has been used to demonstrate the limitations of small-signal models and the capability of the proposed modeling approach to capture the dynamic behavior of the converter when large perturbations are applied. Finally, the automation of the model identification process is discussed.

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“…Similarly, in [10] and [11], the stationary reference frame (with the well-known issue of initial conditions) was used for the control of currents, consequently leaving out the discussion on the decoupling between positive and negative sequences. Similarly, an linear-quadratic regulator (LQR) controller with resonant elements in state feedback control was used in [12], while a virtual admittance controller as part of a synchronous power controller was proposed in [13]. The testing of a relatively complex disturbance observer with a second order general integrator (SOGI) was performed in [14] using only simulation.…”

Section: Introductionmentioning

confidence: 99%

“…The control strategy of the GCC, as presented in [7], based on the instantaneous power theory (IPT), can take many different routes (by different proposed strategies), but essentially takes the two following directions-power characteristic oriented control or voltage support oriented control. It should be emphasized that within the different control strategies presented in [8][9][10][11][12][13][14][15][16], special attention has always been reserved for balanced current control. In most of the literature, as in [8], elimination of the negative sequence current is explained (within the IPT), however, the important issue of cross-coupling between positive and negative sequences has not been discussed.…”

Section: Introductionmentioning

confidence: 99%

Control Strategy for a Grid Connected Converter in Active Unbalanced Distribution Systems

et al. 2019

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The development in distributed energy resources technology has led to a significant amount of non-linear power electronics converters to be integrated in the power system. Although this leads to a more sustainable system, it also can have adverse impacts on system stability and energy power quality. More importantly, the majority of the distribution power systems currently are unbalanced (with asymmetrical voltages) due to load unbalance, while the most common fault types are unbalanced grid faults that can have many adverse effects on distributed resource operations. In that regard, proper control of the grid connected converters in active unbalanced distribution systems will become very important. This paper aims to present the behavior of the advanced grid connected converter control technique under different voltage states at the point of common coupling (according to the ABC classification). The main insufficiencies of the classical control technique will be highlighted, while the paper will propose an appropriate solution for mitigation of negative sequence currents under asymmetrical voltages at the point of common coupling. An extensive experimental verification of the proposed techniques is performed using an advanced laboratory prototype for research in grid integration of distributed resources. The experimental verification clearly demonstrates the benefits offered by the advanced control strategy.

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Synchronous Power Control of Grid-Connected Power Converters under Asymmetrical Grid Fault

Cited by 24 publications

References 28 publications

Improved auto‐synchronisation of grid‐connected PV inverter based on the DC capacitor voltage control

Improved auto‐synchronisation of grid‐connected PV inverter based on the DC capacitor voltage control

Blackbox Large-Signal Modeling of Grid-Connected DC-AC Electronic Power Converters

Control Strategy for a Grid Connected Converter in Active Unbalanced Distribution Systems

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