Short Circuit Current Characteristics Analysis and Improved Current Limiting Strategy for Three-phase Three-leg Inverter under Asymmetric Short Circuit Fault

Liang, Zhen; Lin, Xinchun; Kang, Yong; Gao, Bofeng; He, Lei

doi:10.1109/tpel.2017.2759161

Cited by 60 publications

(30 citation statements)

References 29 publications

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“…Hence, the overvoltage of healthy phases can be mitigated even under a large current. The second method is the unbalance current injection method [57]. By injecting a small current in healthy phases, the overvoltage can be avoided.…”

Section: Current Limiting Strategies Of Gfm Convertermentioning

confidence: 99%

Grid Forming Converters in Renewable Energy Sources Dominated Power Grid: Control Strategy, Stability, Application, and Challenges

Zhang

Xiang

Lin

et al. 2021

Journal of Modern Power Systems and Clean Energy

203

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The renewable energy sources (RESs) dominated power grid is an envisaged infrastructure of the future power system, where the commonly used grid following (GFL) control for grid-tied converters suffers from lacking grid support capability, low stability, etc. Recently, emerging grid forming (GFM) control methods have been proposed to improve the dynamic performance and stability of grid-tied converters. This paper reviews existing GFM control methods for the grid-tied converters and compares them in terms of control structure, grid support capability, fault current limiting, and stability. Considering the impact of fault current limiting strategies, a comprehensive transient stability analysis is provided. In addition, this paper explores the typical applications of GFM converters, such as AC microgrid and offshore wind farm high-voltage direct current (OWF-HVDC) integration systems. Finally, the challenges to the GFM converters in future applications are discussed.

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Section: Current Limiting Strategies Of Gfm Convertermentioning

confidence: 99%

Grid Forming Converters in Renewable Energy Sources Dominated Power Grid: Control Strategy, Stability, Application, and Challenges

Zhang

Xiang

Lin

et al. 2021

Journal of Modern Power Systems and Clean Energy

203

View full text Add to dashboard Cite

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“…The three-phase inverters considered are of a three-phase three-leg design [17], as shown in Fig. 1.…”

Section: A Description Of the Grid-forming Inverters' Dynamic Modelsmentioning

confidence: 99%

Generalized Formulation of Steady-State Equivalent Circuit Models of Grid-Forming Inverters

Cunha

Kim

Barry

et al. 2021

IEEE Open J. Power Energy

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This work proposes positive-and negative-sequence equivalent circuits of grid-forming inverters for steady-state analysis. The proposed models are especially attractive for performing long-duration voltage regulation analysis and short-circuit studies involving grid-forming inverters. Our proposed equivalent circuit models are based on the inverter's voltage and current control loops in the αβ and dq frames. For this reason, they operate according to prescribed control functions and specified impedances (i.e., filter impedance, current limiter block, virtual admittance block, and PI/PR controller block). The equivalent circuit model accuracy is validated by comparing system steady-state voltage and current responses obtained by detailed time-domain models in PSCAD/EMTDC to those by the equivalent circuit models implemented in steady-state load flow program (e.g., OpenDSS). Two distinct control structures implemented in the αβ and dq frames are used for the validation. Single line-to-ground and line-to-lineto-ground faults are simulated in a small islanded microgrid as well as the IEEE 34-node test feeder. Fault impedances varying from 0 to 5 ohms are simulated. We show that the equivalent models precisely replicate the steady-state response of the detailed time-domain models.

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“…(1) Calculate DPF, (2) send the data and communication signals to the CE controller and to the other PD at the same line, (3) apply the ZO controller, (4) obtain the CE decision, (5) check if all signals from the ZO and CE controllers are received, (6) if no, make a delay and check the availability again, 7if all signals received, check the decision of ZO and CE controllers, (8) if the decision is the same, send a trip signal to the breaker, (9) if not, give more priority to the ZO decision, (10) if all the signals did not received, check the peer PD signals, (11) if the peer PD signals received, apply the ZO algorithm, and give a decision, (12) if not, check CE decision, (13) if it received, send the trip signal to the breaker, (14) if the trip signal did not executed, disconnect the closest line to the fault, (15) if CE decision did not received, send a disconnection signal.…”

Section: Pd Priority Algorithmmentioning

confidence: 99%

“…© 2020 The Authors. IET Generation, Transmission & Distribution published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology effect on medium voltage (MV) protections, as DGs contribution to fault is limited around the rated current of the applied inverters [6]. However, the power flow in the grid will vary.…”

Section: Introductionmentioning

confidence: 99%

Overcurrent protection based on ANNs for smart distribution networks with grid‐connected VSIs

Bakkar¹,

Bogarra²,

Córcoles³

et al. 2020

IET Generation Trans & Dist

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Recently, the global concern for protection coordination is growing with the impact of distributed generators connected to medium voltage distribution system. Effective protection strategies need to be developed in order to avoid undesirable tripping when distributed generators based on Voltage Source Inverters are connected to the medium voltage grid. According to Spanish grid code requirements, the inverter controller response in this paper is assessed under grid faults integrating low voltage ride through capabilities. This paper presents a novel use of a communication‐based directional relay system with artificial neural network, an appropriate option for smart grids protection. A protection strategy is proposed using two algorithms. The first algorithm is based on gathering data of all the protective devices in the grid and send it to a centralized controller. The second algorithm is based on a zone controller using the communication between the peer protection devices in the same line. One of the main advantages of the zone controller is that no need to modify the protection devices setting in case of temporary grid reconfigurations. The behaviour of the protection algorithms is validated through both simulations in MATLAB‐Simulink and experimental results.

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Short Circuit Current Characteristics Analysis and Improved Current Limiting Strategy for Three-phase Three-leg Inverter under Asymmetric Short Circuit Fault

Cited by 60 publications

References 29 publications

Grid Forming Converters in Renewable Energy Sources Dominated Power Grid: Control Strategy, Stability, Application, and Challenges

Grid Forming Converters in Renewable Energy Sources Dominated Power Grid: Control Strategy, Stability, Application, and Challenges

Generalized Formulation of Steady-State Equivalent Circuit Models of Grid-Forming Inverters

Overcurrent protection based on ANNs for smart distribution networks with grid‐connected VSIs

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