A Superimposed Current Based Unit Protection Scheme for DC Microgrid

Mohanty, Ramanarayan; Pradhan, Ashok Kumar

doi:10.1109/pesgm40551.2019.8973968

Cited by 55 publications

(18 citation statements)

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“…Further, to enhance system reliability, a hybrid CB is suggested in Augustine et al In this scheme, the integration of MCB with SSCB performs satisfactorily for permanent as well as temporary faults. Later, in Mohanty and Pradhan, a superimposed method is proposed to overcome the above issue. The protection decision is taken from superimposed current components of both ends of the line represented on Δ i‐ plane during a fault.…”

Section: Protection Strategy For Microgridmentioning

confidence: 99%

Distributed generation hybrid AC/DC microgrid protection: A critical review on issues, strategies, and future directions

2020

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Summary The integration of distributed energy resources (DERs) with conventional systems emerges as an intelligent solution for providing uninterrupted and secure power even at times of high load demand. Better load management with a mature fault handling mechanism makes AC a viable option which has an efficiency of 78.24%. In contrast with less power loss and slightly better efficiency of 84.6%, DC microgrid is a reliable option in a low power environment. In order to accommodate all operating conditions and load types, a hybrid system can be designed with a theoretical efficiency of more than 90%. Bidirectional power flows, low inertia, the transition between different modes of operations are the challenges for the protection of alternating current (AC) and direct current (DC) microgrid systems. Power balance fluctuation, absence of zero‐crossing currents, selection of suitable grounding, and coordination between different rating devices restrict the hybrid system to achieve the said efficiency constantly. This paper reviews in detail of existing protection along with grid‐connected algorithms for both modes of operation. Finally, the limitation, major hurdles, and future course of action for a reliable, efficient, and secure hybrid grid system are figured out.

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Section: Protection Strategy For Microgridmentioning

confidence: 99%

Distributed generation hybrid AC/DC microgrid protection: A critical review on issues, strategies, and future directions

2020

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“…Therefore, in order to protect the circuit from fault current, relays are used. Relay senses the fault and sends feedback to circuit breaker which breaks the circuit [43,48]. If the fault generated is so small and cannot be detected by the relay, flywheel inverter will be used, which allows the increase in the value of the fault current [49,50].…”

Section: Protectionmentioning

confidence: 99%

Comprehensive Analysis of Planning Operation and Protection of Microgrid Systems

Muzzammel

2020

JENRR

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Microgrid is a decentralized system in which electrical sources and loads are connected in a way that operates normally in connection with and in synchronous with conventional grid. This system has the ability to work autonomously by disconnecting from conventional grid in island mode. Microgrid offers large number of advantages in power system. Among them, integration of renewable energy sources, reliability, two-way power flow and cost effectiveness are the significant merits of microgrids. Besides its advantages, different challenges are associated with the planning, operation and protection of microgrid systems. Safe two-way power flow, reliable switching of renewable energy, optimal power flow, quick isolation of faulty part from healthy system and incorporation of energy mix modeling are the major challenges behind its real time implementation. In this research, comprehensive analysis is carried out on the planning, operation and protection of microgrid model. A test system is developed in Matlab/ Simulink in which solar power source, wind power source and diesel power source are modelled and connected to residential, commercial and industrial loads. Optimal power flow is achieved through Newton’s method. In addition to this, operation of microgrid test system is ensured by the observation of voltage, current and power under steady state and transient conditions of wind based power generation, DC and AC parameters for solar power generation and generation and demand of power in the case of diesel based power generation within acceptable limits. Circuit breakers are installed to ensure protection against faults. Priority is made on the basis of promotion of renewable energy sources. Moreover, realization of microgrid is depicted with its hardware prototype.

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“…For large DC grids, fast and reliable DC fault protection is one of the fundamental technical challenges [6]. Various fault detection methods have been extensively studied for MMC-HVDC systems [7].…”

Section: Introductionmentioning

confidence: 99%

ANN‐based robust DC fault protection algorithm for MMC high‐voltage direct current grids

Xiang

Yang

Wen

2019

IET Renewable Power Generation

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Fast and reliable protection is a significant technical challenge in the modular multilevel converter (MMC)-based DC grids. The existing fault detection methods suffer from the difficulty in setting protective thresholds, incomplete function, insensitivity to high-resistance faults and vulnerable to noise. This study proposes an artificial neural network (ANN)-based method to enable DC bus protection and DC line protection for DC grids. The transient characteristics of DC voltages are analysed during DC faults. On the basis of the analysis, the discrete wavelet transform is used as an extractor of distinctive features at the input of the ANN. Both frequency-domain and time-domain components are selected as input vectors. A large number of offline data considering the impact of noise is employed to train the ANN. The outputs of the ANN are used to trigger the DC line and DC bus protections and select the faulted poles. The proposed method is tested in a four-terminal MMC-based DC grid under PSCAD/EMTDC. The simulation results verify the effectiveness of the proposed method in fault identification and the selection of the faulty pole. The intelligent algorithm-based protection scheme has good performance concerning selectivity, reliability, robustness to noise and fast action.

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A Superimposed Current Based Unit Protection Scheme for DC Microgrid

Cited by 55 publications

References 0 publications

Distributed generation hybrid AC/DC microgrid protection: A critical review on issues, strategies, and future directions

Distributed generation hybrid AC/DC microgrid protection: A critical review on issues, strategies, and future directions

Comprehensive Analysis of Planning Operation and Protection of Microgrid Systems

ANN‐based robust DC fault protection algorithm for MMC high‐voltage direct current grids

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