Optimization of Current Breaker and Fault Current Limiter in DC Micro-Grid Based on Faulty Transient Analysis

Kong, Liang; Nian, Heng; Huang, Qiang; Zhang, Zhichang; Xu, Jinlong; Kang, Dai

doi:10.23919/icems.2018.8549294

Cited by 9 publications

(8 citation statements)

References 9 publications

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“…The use in fault detection and fault location can be found in [26]. While, the use for the selection of parameters of isolation devices can be found in [27]. The control systems in converters will keep their normal control strategies during the period from fault occurrence to fault detection.…”

Section: Enable Isolation Devices Normal Operationmentioning

confidence: 99%

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Transient Modeling Method for Faulty DC Microgrid Considering Control Effect of DC/AC and DC/DC Converters

Kong

Nian

2020

IEEE Access

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The accurate transient modeling of faulty DC microgrids is the basis of fault detection, fault location and fault isolation. AC/DC and DC/DC converters keeps their normal control strategies until the fault is detected. However, in existing researches, the influence of the control effect of converters is normally being ignored in the transient characteristics of DC microgrids. This omission reduces the accuracy of the faulty transient model. Thus, this paper proposes a transient modeling method for faulty DC microgrid considering control effect of different DC/AC and DC/DC converters. Firstly, the transient characteristics of different converters (including voltage source converter, boost circuit, bidirectional chopper circuit and buck circuit) are analyzed. And then, the faulty transient model of ring-type DC microgrid is established. Furthermore, the correctness of proposed modeling method is verified by comparing with the Control-hardware-in-loop (CHIL) test system. The results show that the proposed method can not only improve the accuracy of transient analysis of faulty DC microgrid, but also enhance the calculation efficiency.INDEX TERMS DC microgrid, Faulty transient modeling, Control effect, Converter.

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Section: Enable Isolation Devices Normal Operationmentioning

confidence: 99%

“…According to [27], there are only two kinds of variables (nodes voltages and lines currents) in system structures of DC microgrids. And the difference expressions of nodes voltages and lines currents can be expressed as: (…”

Section: Transient Analysis Of Faulty DC Microgridmentioning

confidence: 99%

Transient Modeling Method for Faulty DC Microgrid Considering Control Effect of DC/AC and DC/DC Converters

Kong

Nian

2020

IEEE Access

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“…According to [26], the state variables in DC microgrid mainly include nodes voltage and lines current. Assuming that there are N nodes and m lines in DC microgrid, the nodes voltage and lines current can be expressed as:…”

Section: Validation and Comparison Of Vsc Modelmentioning

confidence: 99%

“…The parameters configuration of protection devices in DC microgrid is one of the most typical application for the transient modeling of DC microgrid. Moreover, CB and fault current limiter (FCL) are two mainly protection devices in faulty DC microgrid [26].Thus, in order to verify the value of the transient modeling method proposed in this paper, the method is used to analyze the transient characteristics of faulty DC microgrid under different parameters of CB and FCL. And then, the parameters configuration of protection devices can be achieved based on the transient characteristics of faulty DC microgrid.…”

Section: Application Of DC Microgrid Transient Modelmentioning

confidence: 99%

Transient Modeling and Analysis of VSC Based DC Microgrid During Short Circuit Fault

Nian

Kong

2019

IEEE Access

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The application of distributed renewable energy (DER) drives the development of DC microgrid based on voltage source converter (VSC). And short circuit fault protection is a significant challenge for the development of VSC based DC microgrid. This paper proposes a transient modeling method for VSC based DC microgrid. Firstly, the transient characteristics of VSC under DC bus voltage control mode and active power control mode are analyzed. And then the faulty DC microgrid model, which consists of VSC model and DC line model, is modeled. And the calculation expressions of state variables in DC microgrid are presented. Next, the correctness of proposed modeling approach is verified by comparing with the electromagnetic transient (EMT) simulation by Matlab/Simulink. Moreover, the case study on the parameters configuration of DC microgrid protection devices shows that the transient modeling method can be effectively used in faulty DC microgrid analysis. The method proposed in this paper can not only ensure the calculation efficiency, but also improve the accuracy of DC microgrid analysis on fault.INDEX TERMS DC microgrid, dc fault, voltage source converter (VSC), dc bus voltage control mode, active power control mode.

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“…For dc feeders the speed of fault location becomes critical, typically 10's of microseconds, due to the following reasons. 1) In response to a fault, current in dc circuits rises in a matter of tens of microseconds [2], without having a natural current zero. If the fault current crosses the breaking limit of the controlling circuit breaker, it can not be interrupted.…”

Section: Introductionmentioning

confidence: 99%

A Closed-Form Mathematical Model and Method for Fast Fault Location on a Low Voltage DC Feeder Using Single-Ended Measurements

Gani

Brahma

2022

IEEE Open J. Power Energy

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Fault location on a dc microgrid feeder needs to be extremely fast to protect the circuit breaker and converter-source components. This paper develops a seminal theoretical foundation for fast fault location on a dc feeder that uses only singleended local measurements in time domain. The theory provides a closed-form deterministic solution for fault location, making the resulting fault location method agnostic to system-topology and immune to fault resistance. The theory is developed with ideal dc voltage sources, and extended to practical converter-sources. The performance of the resulting method is demonstrated by simulating a dc feeder with converters connected at both ends, modeled in PSCAD.

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Optimization of Current Breaker and Fault Current Limiter in DC Micro-Grid Based on Faulty Transient Analysis

Cited by 9 publications

References 9 publications

Transient Modeling Method for Faulty DC Microgrid Considering Control Effect of DC/AC and DC/DC Converters

Transient Modeling Method for Faulty DC Microgrid Considering Control Effect of DC/AC and DC/DC Converters

Transient Modeling and Analysis of VSC Based DC Microgrid During Short Circuit Fault

A Closed-Form Mathematical Model and Method for Fast Fault Location on a Low Voltage DC Feeder Using Single-Ended Measurements

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