The Estimation of the Influence of Each Harmonic Component in Load Unbalance of Distribution Transformers in Harmonic Loading Condition

Noshahr, Javad Behkesh; Bagheri, Mehdi; Kermani, Mostafa

doi:10.1109/eeeic.2019.8783488

Cited by 9 publications

(3 citation statements)

References 8 publications

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“…The presence of current harmonics in power networks negatively affects installed devices. Its destructive influence is observed on passive elements like cables or capacitors, i.e., decreasing their durability [3][4][5][6], and on active devices as well, e.g., switching apparatus or protective relays [7,8]. The presence of harmonics may result in power network components behaving unpredictably [9] or may cause deterioration of operating conditions.…”

Section: Problem Statementmentioning

confidence: 99%

Study of Arc Parameters of AC Relays Operating under Distorted Supply Voltage Conditions

Smugala

Bonk

2020

Energies

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The paper presents a procedure for measuring and analyzing the switching arc parameters occurring in air-insulated low voltage (LV) relays operating in distorted supply voltage conditions. The main purpose of the research was the analysis of the switching arc duration and its energy affecting the current breaking capacity of the selected LV current interrupters (CI). The performed study and simple statistical analysis enabled the determination of the main factors and their impact level on parameters of the switching arc that comes about during switching-off operation. Experimental tests executed for various shapes of the supply voltage but similar RMS (Root Mean Square) and THD (Total Harmonic Distortion) values and for various breaking moments of the load current allowed recognition of the decisive factors for estimating the tested relay’s switching-off capacity. Tests stand combined with dedicated software developed in the frame of the research, permiting fast calculation of the arc parameters based on a large number of recorded diagrams.

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Section: Problem Statementmentioning

confidence: 99%

Study of Arc Parameters of AC Relays Operating under Distorted Supply Voltage Conditions

Smugala

Bonk

2020

Energies

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“…Resultantly, an appropriate control algorithm has been implemented by authors in [10] using the dSPACE board based on DS1104 micro-controller. In the case of a 3-phase, 4-wire system is considered to supply power to an unbalanced non-linear load while a high capacity of current starts flowing in the neutral wire that eventually damages the electrical equipment [11]. The main source of harmonics in a 3-phase, 4-wire system is the effect of power electronic devices that primarily consist of a non-linear load so SAPF can be used to mitigate these harmonics.…”

Section: Introduction and Related Studiesmentioning

confidence: 99%

Implementation of ANN-Based Embedded Hybrid Power Filter Using HIL-Topology with Real-Time Data Visualization through Node-RED

et al. 2021

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Electrical power consumption and distribution and ensuring its quality are important for industries as the power sector mandates a clean and green process with the least possible carbon footprint and to avoid damage of expensive electrical components. The harmonics elimination has emerged as a topic of prime importance for researchers and industry to realize the maintenance of power quality in the light of the 7th Sustainable Development Goals (SDGs). This paper implements a Hybrid Shunt Active Harmonic Power Filter (HSAHPF) to reduce harmonic pollution. An ANN-based control algorithm has been used to implement Hardware in the Loop (HIL) configuration, and the network is trained on the model of pq0 theory. The HIL configuration is applied to integrate a physical processor with the designed filter. In this configuration, an external microprocessor (Raspberry PI 3B+) has been employed as a primary data server for the ANN-based algorithm to provide reference current signals for HSAHPF. The ANN model uses backpropagation and gradient descent to predict output based on seven received inputs, i.e., 3-phase source voltages, 3-phase applied load currents, and the compensated voltage across the DC-link capacitors of the designed filter. Moreover, a real-time data visualization has been provided through an Application Programming Interface (API) of a JAVA script called Node-RED. The Node-RED also performs data transmission between SIMULINK and external processors through serial socket TCP/IP data communication for real-time data transceiving. Furthermore, we have demonstrated a real-time Supervisory Control and Data Acquisition (SCADA) system for testing HSAHPF using the topology based on HIL topology that enables the control algorithms to run on an embedded microprocessor for a physical system. The presented results validate the proposed design of the filter and the implementation of real-time system visualization. The statistical values show a significant decrease in Total Harmonic Distortion (THD) from 35.76% to 3.75%. These values perfectly lie within the set range of IEEE standard with improved stability time while bearing the computational overheads of the microprocessor.

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“…The use of these unbalanced loads of electrical equipment will lead to the unbalance of our power supply system and affect the quality of power supply in the power grid. At the same time, the fluctuation of the load will increase the harmonic distortion of output voltage, and even cause the voltage of the grid to rise or fall, causing oscillations, which will affect the safety of power operation, and various devices have higher and higher requirements for quality of power system input [1,2]. The contradiction between these two aspects has become remarkable.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Pulse Width Modulation Strategy of a High-Frequency Link Three-Phase Four-Leg Matrix Converter Based on Compensation Theory

Wang

Pan

et al. 2019

Applied Sciences

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A high-frequency link (HFL) three-phase four-leg matrix converter (MC) can output three-phase balanced voltage for unbalanced load conditions. It is an inverter with great development potential. This paper presents a hybrid pulse width modulation (HPWM) strategy for a four-wire matrix converter based on the fourth bridge leg compensation method. Firstly, the rear-stage topology of a high-frequency link three-phase four-leg matrix converter is decoupled into two sets of ordinary three-phase four-wire inverters. Then the compensation strategy is applied to separate the fourth bridge leg from the coupling of the ordinary inverter and realize its independent control. Under the theory of compensation, the fourth bridge leg plays a role in compensating the deviation of the neutral point potential when the load is unbalanced, the fourth bridge leg does not need to work when the load is balanced. Finally, the fourth bridge leg modulation wave obtained by the compensation method is combined with the front three bridge leg modulation waves to perform the coupling control using the hybrid pulse width modulation strategy. It has changed the problem that the previous hybrid pulse width modulation strategy cannot be directly applied to the four-wire matrix converter. This strategy is simple to control, without adding any auxiliary commutation detection circuitry, can effectively solve the inherent commutation problem in the bidirectional switch tube of the four-wire matrix converter. It simplifies the complexity of the system, reduced control cost, and high switching loss caused by high switching frequency. The fast adjustment function of compensation strategy makes the dynamic response performance of system under load fluctuation state more prominent, the harmonic distortion rate is smaller. The perfect combination of two strategies allows the high-frequency link three-phase four-leg matrix converter with any form of load to give full play to its structural advantages. The related work verifies the feasibility and effectiveness of the modulation method and control logic.

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The Estimation of the Influence of Each Harmonic Component in Load Unbalance of Distribution Transformers in Harmonic Loading Condition

Cited by 9 publications

References 8 publications

Study of Arc Parameters of AC Relays Operating under Distorted Supply Voltage Conditions

Study of Arc Parameters of AC Relays Operating under Distorted Supply Voltage Conditions

Implementation of ANN-Based Embedded Hybrid Power Filter Using HIL-Topology with Real-Time Data Visualization through Node-RED

Hybrid Pulse Width Modulation Strategy of a High-Frequency Link Three-Phase Four-Leg Matrix Converter Based on Compensation Theory

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