The Experts below are selected from a list of 42 Experts worldwide ranked by ideXlab platform

Chen Jin - One of the best experts on this subject based on the ideXlab platform.

  • Faulty Phase Selection Criterion in AC/DC Hybrid Power System Based on the Comparison of Phase/Sequence Voltage Amplitude
    2013
    Co-Authors: Chen Jin
    Abstract:

    In order to tackle the deficiency that the conventional Phase selection component may mal-operate when short-circuit fault occurs at AC outlet of inverter side in a AC/DC hybrid grid,.a novel faulty Phase selection algorithm which is based on the comparison of Phase/Sequence Voltage amplitude has been proposed in this paper.In this paper,on the basis of boundary conditions of contingency and the Sequence network topology,the quantitative relationship of the faulty Phase,non-fault Phase Voltage amplitudes and the positive Sequence Voltage amplitude have been analyzed.Hence the faulty Phase can be rapidly identified via simple amplitude comparison.This algorithm is without auxiliary criterion and is free of the non-linear characteristic of the convertor stations.The simulated illustration of a certain grid in China validates the effectiveness of proposed algorithm.

  • faulty Phase selection criterion in ac dc hybrid power system based on the comparison of Phase Sequence Voltage amplitude
    Proceedings of the CSU-EPSA, 2013
    Co-Authors: Chen Jin
    Abstract:

    In order to tackle the deficiency that the conventional Phase selection component may mal-operate when short-circuit fault occurs at AC outlet of inverter side in a AC/DC hybrid grid,.a novel faulty Phase selection algorithm which is based on the comparison of Phase/Sequence Voltage amplitude has been proposed in this paper.In this paper,on the basis of boundary conditions of contingency and the Sequence network topology,the quantitative relationship of the faulty Phase,non-fault Phase Voltage amplitudes and the positive Sequence Voltage amplitude have been analyzed.Hence the faulty Phase can be rapidly identified via simple amplitude comparison.This algorithm is without auxiliary criterion and is free of the non-linear characteristic of the convertor stations.The simulated illustration of a certain grid in China validates the effectiveness of proposed algorithm.

M. Nakamura - One of the best experts on this subject based on the ideXlab platform.

  • Insulation deterioration monitoring system for ungrounded power distribution systems
    IEEE Transactions on Power Delivery, 1994
    Co-Authors: H. Ohnishi, H. Yokoyama, T. Yoneyama, M. Aoyagi, Y. Akutsu, M. Kanoi, I. Iwashita, H. Haga, M. Nakamura
    Abstract:

    An insulation monitoring system is described for detecting ungrounded power distribution sections having an incipient intermittent ground caused by insulation deterioration. Test results are presented to demonstrate the effectiveness of the monitoring system. At first, the system concept is described. Next, the principle of the section detection method is given which is based on the Phase relationship between the zero-Phase Sequence Voltage (V/sub 0/) and zero-Phase Sequence current (I/sub 0/). Finally, test results, which demonstrate that the insulation monitoring system can detect a section having a ground current of several tens of mA, are presented.

R.e. Morrison - One of the best experts on this subject based on the ideXlab platform.

  • Probabilistic modeling of Voltage asymmetry
    IEEE Transactions on Power Delivery, 1995
    Co-Authors: L. Pierrat, R.e. Morrison
    Abstract:

    A new formulation is proposed regarding power network imbalance. From symmetrical component theory, a random vector of imbalance is defined having two dimensions. The probability distribution of negative Phase Sequence Voltage is calculated and used to derive a probability distribution for current harmonics generated by a six pulse power converter. Three applications of the theory are considered, the first concerns the validation of the model and the characterisation of imbalance observed on two networks, the second concerns the interaction between Voltage imbalance and harmonic current generated by a power converter and the third application concerns the overheating of an induction motor subject to a random negative Phase Sequence Voltage. The analytical nature of the model forms a compromise between simplicity of utilisation and the representation of complex phenomena. >

Kevin J. Dyke - One of the best experts on this subject based on the ideXlab platform.

  • Zero Phase Sequence Voltage injection for the alternate arm converter
    IET Seminar Digest, 2015
    Co-Authors: F J Moreno, Michael M C Merlin, David Reginald Trainer, T C Green, Kevin J. Dyke
    Abstract:

    The Alternate Arm Converter (AAC) is a Voltage source converter being developed as an alternative to the Modular Multilevel Converter (MMC) for HVDC power transmission and reactive power compensation. Each Arm of the converter contains high Voltage series IGBT Director Switches and full-bridge cells, which enables the VSC to ride through AC and DC network faults. This paper describes how the AAC can be optimised by modulating the converter terminal Voltages with zeroPhase Sequence triplen harmonic components. The optimisation reduces the ratio of the number of the full-bridge cells compared to the simpler Director Switches which offers a valuable improvement in footprint and efficiency.

Tony Ahfock - One of the best experts on this subject based on the ideXlab platform.

  • Harmonic injection due to negative Phase Sequence correction in static VAr compensators
    2015 Australasian Universities Power Engineering Conference (AUPEC), 2015
    Co-Authors: Andrew Hewitt, Tony Ahfock
    Abstract:

    Negative Phase Sequence Voltages within a three Phase power system are generally caused by unbalanced loads. Power utilities are generally required to limit the amount of negative Phase Sequence Voltage on the grid because of the increased heating it causes in three Phase machines. Static VAr compensators (SVCs) have been widely used to address unbalanced Voltage problems in distribution, sub-transmission and transmission networks. An SVC can however introduce harmonic currents into the power system due to the power electronic switching of static reactive devices. These harmonic currents can also result in additional heating and degraded performance of connected loads. This paper investigates the relationship between SVC Negative Phase Sequence correction and third harmonic injection into the power system.