Detection of Ground Insulation Faults in Ungrounded DC Power Supply Systems by Using a DC Current Injection Method

Liu, Yow-Chyi; Chang, En-Chih; Lee, Yong-Lin; Lin, Yu-Zhong

doi:10.1016/j.egypro.2018.11.154

Cited by 10 publications

(2 citation statements)

References 11 publications

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“…Simulations and experimentation results exhibit that the suggested REI possesses good performance in smaller than voltage THD and dip, which exceed specified IEEE standards under diverse load situations. As a result, the suggested controller will inspire the author to realize closed-loop architectures of other new circuits, for instance a high step-up converter of wind energy system, detection circuit of ground insulation fault, and LED street light driver [48][49][50]. The author is also convinced that the renewable energy correlative circuits (both an AC-DC rectifier and DC-DC converter) can definitely be integrated into the presented REI, generating more contributions in control of power electronic converters.…”

Section: Discussionmentioning

confidence: 99%

A Novel Fixed-Time-Convergent Sliding Mode Technology Using Improved Quantum Particle Swarm Optimization for Renewable Energy Inverters

Chang¹

2020

Sustainability

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This paper describes a robust feedback technique involving novel fixed-time-convergent sliding mode technology (NFTCSMT) using improved quantum particle swarm optimization (QPSO) to obtain high-performance renewable energy inverters. Customary SMT encounters long time convergence towards the origin and the influence of the dithering. The NFTCSMT can rapidly impel system-following movement to approach the sliding manifold and effectively accelerate the convergence speed to equilibrium states. However, the NFTCSMT cannot easily select the global optimum of the controller parameters subject to large parameter changes and nonlinear interventions, leading to the dither phenomenon/steady-state error still being caused. The dither inflicts decreased control accuracy, high voltage harmonics, major harm in relation to switching components, and great thermal losses in power electronic converters. The improved QPSO including the unique property of a random compression/expansion factor is used to find optimal parameters of the NFTCSMT in practical applications, for the reason that it importantly mitigates the dither and amends convergent speed as well as guaranteeing global convergence. The presented alliance amid NFTCSMT and improved QPSO achieves faster response time and singularityless, and also yields high-accuracy tracking and dither attenuation. The robust stability using Lyapunov theorem of the suggested system has provided precise mathematical derivations. Simulations show that the suggested controller offers less than 0.1% voltage THD (total harmonic distortion) which exceeds IEEE standard 519 under heavily distorted rectifier loads, and less than 10% voltage dip which surpasses IEEE standard 1159 during step load transients. Experimental tests of an algorithmically controlled laboratory prototype (1 kW, 110 Vrms/60 Hz) of a renewable energy inverter (REI) based on digital signal processing manifest less than 0.05% voltage THD in the face of great inductor-capacitor alterations, and less than 10% voltage dip in the face of transient load scenarios.

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Section: Discussionmentioning

confidence: 99%

A Novel Fixed-Time-Convergent Sliding Mode Technology Using Improved Quantum Particle Swarm Optimization for Renewable Energy Inverters

Chang¹

2020

Sustainability

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“…If it still exists, it means that the DC circuit is not the circuit that triggers the grounding fault, and the normal power supply should be restored immediately, and the rest of the circuits should be operated in turn until the fault circuit is found [4] . Using this method, should ensure that the DC feeder power disappearance time as short as possible, find the principle of: first outdoor, after the indoor; first break the non-important circuits, after the break the important circuits; first break the newly commissioned equipment, after the break of the other equipment [5] .…”

Section: Pulling Methodsmentioning

confidence: 99%

Ground fault detection in substation DC system based on improved differential current method

Li,

Zhang,

Shen

et al. 2024

J. Phys.: Conf. Ser.

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DC system is the main electrical equipment and control signal system in the substation, and its stability and reliability are directly related to whether the power system can operate safely. This paper firstly introduces the common methods of insulation detection of DC power system in substation and its advantages and disadvantages, and proposes the differential current method based on unbalanced bridge, i.e., using the combination of unbalanced bridge and leakage current sensor to detect the insulation condition of DC system, which makes up for the defects of the traditional differential current method that can only detect the faults of simple branch circuits, and realizes the detection of multi-branch grounding under complex situations. Finally, the feasibility of this method is verified by building a simulation model through simulink.

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A new design of substation grounding based on electrolytic cathodic protection and on transfer corrosion current

Fang²,

et al. 2021

Electric Power Systems Research

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Detection of Ground Insulation Faults in Ungrounded DC Power Supply Systems by Using a DC Current Injection Method

Cited by 10 publications

References 11 publications

A Novel Fixed-Time-Convergent Sliding Mode Technology Using Improved Quantum Particle Swarm Optimization for Renewable Energy Inverters

A Novel Fixed-Time-Convergent Sliding Mode Technology Using Improved Quantum Particle Swarm Optimization for Renewable Energy Inverters

Ground fault detection in substation DC system based on improved differential current method

A new design of substation grounding based on electrolytic cathodic protection and on transfer corrosion current

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