A novel hybrid approach using sms and ROCOF for islanding detection of inverter-based DGs

Akhlaghi, Shahrokh; Sarailoo, Morteza; Akhlaghi, Arash; Ghadimi, Ali Asghar

doi:10.1109/peci.2017.7935746

Cited by 18 publications

(16 citation statements)

References 25 publications

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“…Therefore, another type of IDT called the hybrid IDT has also been suggested, which amalgamate two or more IDTs from both the methods, ie, active and passive IDTs. In a previous study, a hybrid IDT based on the combination of the slip mode frequency shift (an active IDT) and ROCOF and over/under frequency relay (a passive IDT) has been proposed. Another hybrid IDT based on the probability of islanding (PoI) which uses a combination of active active passive along with communication‐based technique (a remote IDT) is suggested in another study …”

Section: Introductionmentioning

confidence: 99%

Design and verification of hardcore reconfigurable relay for islanding detection and subsequent mode adaptation of microgrid

Kumar

Pratap

2019

Int Trans Electr Energ Syst

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Summary Islanding detection is an important factor of the microgrid (MG) protection. Since an MG can work in two modes, ie, grid‐connected and stand‐alone/islanded mode, during any abnormality appearing in the upstream grid, the MG must be decoupled at the point of common coupling and made to operate in the islanded mode to sustain the critical loads. Because of this mode switching, it is necessary to change the pick up current settings of the overcurrent relays (OCRs) at the distributed generators (DGs) to accommodate the changes in the current levels. In this paper, a hardcore reconfigurable multifunctional relay is designed, which is used for the islanding detection as well as mode adaptation within the MG. A modular approach is used to implement the design, which is targeted on field‐programmable gate array (FPGA). Hardware description language, Verilog, is used to develop the optimized hardware. The relay has different submodules viz overcurrent, voltage unbalance, and rate of change of frequency (ROCOF) modules, which are controlled by a soft controller using a multiplexer. Hardware‐in‐loop (HIL) verification for various test cases under different power mismatches is performed on the Real Time Digital Simulator (RTDS) with FPGA setup. The results suggest that the proposed hardcore relay have the capability to identify the islanding event within permissible time and subsequently adapt to the mode of operation effectively.

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Section: Introductionmentioning

confidence: 99%

Design and verification of hardcore reconfigurable relay for islanding detection and subsequent mode adaptation of microgrid

Kumar

Pratap

2019

Int Trans Electr Energ Syst

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“…Here, secondary IDM executes when the primary IDM fails to detect the islanding condition successfully. Several HIDMs have been proposed by the researchers in the recent past . IDM presented in Menon and Nehrir uses the positive feedback as active method and voltage unbalance as passive methods.…”

Section: Introductionmentioning

confidence: 99%

“…Several HIDMs have been proposed by the researchers in the recent past. [20][21][22][23][24][25][26] IDM presented in Menon and Nehrir 20 uses the positive feedback as active method and voltage unbalance as passive methods. Yin et al 21 proposed an HIDM using rate of change of voltage and adaptive reactive power shift.…”

Section: Introductionmentioning

confidence: 99%

Hybrid islanding detection with optimum feature selection and minimum NDZ

Chandak

Mishra

Rout

2018

Int Trans Electr Energ Syst

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Summary Integration of the distributed generators into a distribution system encounters various system issues, and out of those islanding detection is 1 of the major protection problems to focus on. Many detection schemes have been proposed in the recent past, which possess a nondetection zone (NDZ) and usually neglect to provide a justification for the selected detecting features among all possible measures. Sensitive feature selection and minimization of NDZ are the 2 major objectives of this study. This paper comprises of 2 operational modes of designed IEEE 13‐bus test feeder (offline mode and online mode of operation). The offline mode of system operation focuses on selecting the optimal feature vectors using the proposed “modified multiobjective differential evolution algorithm” coupled with an extreme learning machine classifier. The modified multiobjective differential evolution algorithm‐extreme learning machine is applied to find out 2 optimum feature vectors, one by considering accuracy and minimal features and another one by dependability with a single feature as its objective functions. The online mode concentrates on the proposed new hybrid islanding detection method comprised of both passive and active detection techniques. Passive technique implements a decision tree designed by using the obtained accuracy‐based feature vector. Decision tree triggers the active method on suspecting the runtime instances as non‐islanding events to reduce the NDZ. Active method uses the obtained dependability‐based feature vector as an injecting parameter. The test results indicate the efficiency and accuracy of the proposed approach under different circumstances of power mismatch.

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“…The sudden disconnection of DGs could affect to the stability and reliability of the MG system [4,5]. Low voltage ride through (LVRT) operation strategy of the MG system should be considered to improve the system stability and reliability [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Low-Voltage Ride-Through Operation of Grid-Connected Microgrid Using Consensus-Based Distributed Control

et al. 2018

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Since the penetration of distributed energy resources (DERs) and energy storage systems (ESSs) into the microgrid (MG) system has increased significantly, the sudden disconnection of DERs and ESSs might affect the stability and reliability of the whole MG system. The low-voltage ride-through (LVRT) capability to maintain stable operation of the MG system should be considered. The main contribution of this study is to propose a distributed control, based on a dynamic consensus algorithm for LVRT operation of the MG system. The proposed control method is based on a hierarchical control that consists of primary and secondary layers. The primary layer is in charge of power regulation, while the secondary layer is responsible for the LVRT operation of the MG system. The droop controller is used in the primary layer to maintain power sharing among parallel-distributed generators in the MG system. The dynamic consensus algorithm is used in the secondary layer to control the accurate reactive power sharing and voltage restoration for LVRT operation. A comparison study on the proposed control method and centralized control method is presented in this study to show the effectiveness of the proposed controller. Different scenarios of communication failures are carried out to show the reliability of the proposed control method. The tested MG system and proposed controller are modeled in a MATLAB/Simulink environment to show the feasibility of the proposed control method.

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A novel hybrid approach using sms and ROCOF for islanding detection of inverter-based DGs

Cited by 18 publications

References 25 publications

Design and verification of hardcore reconfigurable relay for islanding detection and subsequent mode adaptation of microgrid

Design and verification of hardcore reconfigurable relay for islanding detection and subsequent mode adaptation of microgrid

Hybrid islanding detection with optimum feature selection and minimum NDZ

Low-Voltage Ride-Through Operation of Grid-Connected Microgrid Using Consensus-Based Distributed Control

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