Time- and Frequency-Domain Fault Detection in a VSC-Interfaced Experimental DC Test System

Yeap, Yew Ming; Geddada, Nagesh; Satpathi, Kuntal; Ukil, Abhisek

doi:10.1109/tii.2018.2796068

Cited by 83 publications

(34 citation statements)

References 21 publications

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“…According to the sampling frequency used in all cases (100 kHz), each sample takes 10 µs. Based on the results given in Section 5, the most delayed case takes less than 100 µs, which proves that the proposed method is faster than a majority of the proposed algorithms in literature [36][37][38]. According to the sensitivity analysis, the proposed scheme gives accurate and selective results for faults very close or far from the measurement location.…”

Section: Discussionmentioning

confidence: 69%

A Harmonic Based Pilot Protection Scheme for VSC-MTDC Grids with PWM Converters

2019

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This paper presents a selective harmonic-based pilot protection scheme for detecting faults happened in the DC transmission section of VSC-MTDC grids with pulse width modulation (PWM) voltage source converters (VSCs). When a DC fault occurs in VSC-MTDC grids with PWM converters, first carrier frequency harmonic (FCFH) currents will be generated by all VSCs through the grid. FCFH currents have different flowing directions depending on the characteristics and the location of the fault. According to the characteristics of the existing FCFH in the fault currents, a selective pilot protection algorithm is designed for VSC-MTDC grids. Considering the internal and external DC transmission faults for specific zones, and the circulating flow of FCFH current in the DC link capacitors, the relays cannot detect FCFH currents for external faults, while for the internal faults, FCFH currents are clearly detected. To design the selective protection algorithm, Hilbert-Huang transform (HHT) is used to detect the instantaneous frequency and the instantaneous amplitude of the high frequency intrinsic mode function (IMF)s, which are extracted from the fault current waves. Multiple faults with different characteristics are applied to CIGRE DCS-2 VSC-MTDC grid with two-level and three-level VSCs modeled in PSCAD, and the HHT-based selective protection scheme is designed in MATLAB. According to the results, the proposed algorithm can truly discriminate between internal and external faults.

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Section: Discussionmentioning

confidence: 69%

A Harmonic Based Pilot Protection Scheme for VSC-MTDC Grids with PWM Converters

2019

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“…Another use of wavelet analysis can be found, for example, in [18][19][20]. Yeap et al [21] and Sejdić et al [22] summarise some of the advantages and disadvantages of the FFT and WT methods. It is demonstrated that FFT is fast, simple for implementation, accurate, and suitable for embedded systems, while its constant window width is the main disadvantage.…”

Section: Signal Analysis and Anomaly Detection Methodsmentioning

confidence: 99%

Advanced Supervision of Smart Buildings Using a Novel Open-Source Control Platform

Minarčík

Procházka²,

Gulan

2020

Sensors

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Gathering data and monitoring performance are at the heart of energy efficiency and comfort securing strategies in smart buildings. Therefore, it is crucial to present the obtained data to the user or administrator of such a building in an appropriate form. Moreover, evaluating the data in real time not only helps to maintain comfort, but also allows for a timely response from the user or operator to a possible fault. Continuous online monitoring and analysis of process behaviour, which is referred to as advanced supervision, is addressed in this paper by developing a procedure that will form an artificial operator autonomously supervising process. After introducing several techniques that are used for signal analysis, we propose an approach to advanced supervision of processes in smart buildings or other industrial control systems. The developed procedure is implemented on a control system platform that is particularly suitable for this purpose. Moreover, this platform includes a framework that provides support for the implementation of advanced control techniques and it is based on open-source tools, which is rarely seen in industrial applications. The developed advanced supervision procedure has been tested in simulation as well as in a practical case study using a real two-storey family house.

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“…t 1 -t 2 : Before S 1 opening, the H-SFCL is in current limiting stage I which produces a transient current limiting impedance for initial impulse current. The delay time of S 1 should be within 2 ms consisting of 1 ms fault detection time [52], 0.5 ms communication delay [16] and hundreds of microseconds action delay [46]. t 1 -t 5 : The H-SFCL is in current limiting stage II, which produces a steady current limiting impedance, limiting continuous fault current during the whole breaking process of the H-DCCB.…”

Section: Action Sequence Of H-sfcl and H-dccbmentioning

confidence: 99%

Parameter Matching and Optimization of a Hybrid Type DC SFCL Considering the Transient Characteristics of VSC-Based DC Systems

et al. 2019

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Voltage source converter-based (VSC-based) DC systems play an important role in connecting large-scale renewable energy and distributed energy, but they are vulnerable to DC short-circuit fault and lacks mature protection devices and appropriate protection strategies. Therefore, a hybrid type DC superconducting fault current limiter (H-SFCL) is proposed and the current limiting mechanism of the SFCL is analyzed. According to the requirements and strategies for protection, several different effective parameter matching and optimization methods of the H-SFCL are proposed by combining optimization algorithms and two short-circuit transient calculation models of VSC-based DC systems. The optimization methods proposed in this paper are compared and analyzed in terms of convergence, running time, calculation range and stability of optimization results, revealing their respective calculation characteristics. Finally, the effectiveness of parameter matching and optimization methods are well validated by comparison and analysis of simulation. The proposed methods can select a good parameter matching scheme of the H-SFCL to deal with different requirements.Keywords: hybrid type DC SFCL (H-SFCL); DC circuit breaker (DCCB); voltage source converter (VSC); parameter matching; optimization IntroductionVoltage source converter (VSC)-based DC transmission technology can realize active and reactive power controlling [1] and bus voltage supporting [2], which can restrain the fluctuation and randomness of renewable energy in a large range and has potential advantages in renewable energy paralleling in the power grid [3,4]. Meanwhile with a common DC voltage and easy parallel connections, VSC-based DC transmission technology is the most appropriate for multi-terminal DC systems (MTDC) [5]. As a promising research hotspot, several VSC-based demonstration projects have been built including the conventional two or three level converter and modular multi-level converter [6][7][8][9][10]. Nevertheless, the safe, reliable and continuous operation of VSC-based DC system is the premise of exerting its own advantages. Due to the low damping of the DC system, DC short-circuit fault with high current rising rate and fast fault propagation speed is a great threat to the VSC-based DC system [11], which requires the sensitivity of fault identification and the rapidity of protective action. According to [12,13], DC short-circuit current must be interrupted within 5 ms to ensure the safety of VSC components.At present, there are three main methods to deal with DC short-circuit fault, including blocking trigger pulse of converter, opening all AC circuit breakers (ACCBs) on AC sides of the VSC system then opening DC circuit breakers (DCCBs) [13]. DC short-circuit current is difficult to be cleared because

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Time- and Frequency-Domain Fault Detection in a VSC-Interfaced Experimental DC Test System

Cited by 83 publications

References 21 publications

A Harmonic Based Pilot Protection Scheme for VSC-MTDC Grids with PWM Converters

A Harmonic Based Pilot Protection Scheme for VSC-MTDC Grids with PWM Converters

Advanced Supervision of Smart Buildings Using a Novel Open-Source Control Platform

Parameter Matching and Optimization of a Hybrid Type DC SFCL Considering the Transient Characteristics of VSC-Based DC Systems

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