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Matrices transformation of voltage and current transformers represent the amplitude and angular relationships between the voltages and currents of the secondary side and primary side. As a result, the selected state of asymmetry can be otherwise characterized by the primary and secondary side of the transformer depending on the connection system. For example, single-phase asymmetry on the primary...
Current methods for measurement and analysis of power quality is based on the selection of a representative period of time, usually a week, corresponding to normal operating conditions. However such conditions as variability of load and generation or changing the configuration of power system network may have a significant impact on the quality parameters of power system. In order to distinguish and...
The aim of this work is to analyze possibility of using parameters of an oscillating transient component which appears during fault condition in HVDC systems for detection and localization of faults. Two main parameters of mentioned components are considered, amplitude and frequency, which naturally are associated with parameters of circuits during fault determined by location of the fault. Proposed...
This paper presents principles of consideration of transformer winding connections in process of transfer of voltage dips across transformer. The aim of the work is to define transformation matrices and investigate its application for different types of voltage dips. Results of the algorithm with implemented transformation matrices is presented. The transformation matrices can be used for correction...
This paper presents implementation of instantaneous voltage-current trajectory (I, U) and its linearization. The aim of the work is to investigate possibility of using the slope of the linearized trajectories obtained synchronously in few measurement points. Field measurement results are presented using wide-area power quality monitoring system installed in distribution network with small hydro power...
The aim of this work is to analyze evolutionary algorithms in point of application for detection and localization of faults in HVDC systems. Considered faults are localized at DC side. The initial condition for the algorithm is low sampling rate up to 5–100kHz. This condition eliminates application of traditional traveling wave technique due to not sufficient time resolution. It is proposed to base...
An idea of empirical mode decomposition (EMD) with Hubert Transform (HT) as well as cross-section of smoothed pseudo Wigner-Ville distribution (SPWVD) and instantaneous distortion index (IDIN) are investigated in point of detection of high frequency inrush power quality disturbances. Application and assessment of mentioned techniques are performed using disturbances recorded by wide area power quality...
This paper is a continuation of Part I [1] and presents the application of a comprehensive system of registration, archiving and data processing for the wide-area monitoring of power quality in a separated part of real power grid with distributed renewable generation. Real case studies related to tracking of disturbances' wandering and localization of sources of voltage disturbances are presented.
This paper presents the developed and built comprehensive system of registration, archiving and data processing for the wide-area monitoring of power quality in a separated part of real power grid with distributed renewable generation. Real case studies related to localization of sources of voltage disturbances are presented.
In many applications, very fast methods are required for estimating of amplitudes of current signals distorted by noise. In this paper new parallel algorithms are proposed, which can be implemented by analogue adaptive circuits employing selected neural networks principles. Algorithms based on the total least-squares (TLS) and the robust total least-squares (RTLS) criteria are developed and used to...
Measurements of free-burning arc in the power network were recorded at 22 kV busbar voltage transformer. As the measuring transformer distort the record, it was not possible to determine the response by measurements. The experiment was therefore modeled using EMTP -ATP. In addition to the described model of measuring voltage transformer, it has been modeled the network in which the measurement takes...
This work is concentrated on assessment of contribution of distributed generation, represented by small hydro power plants (SHP), in power quality disturbances at low and medium voltage in distribution networks. Investigations are based on the dispersed synchronized measurements at low voltage level including two small hydro power plants and utilization substation, connected to the same medium voltage...
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