scholarly journals A Novel Three-Phase Harmonic Power Flow Algorithm for Unbalanced Radial Distribution Networks with the Presence of D-STATCOM Devices

Electronics ◽  
2021 ◽  
Vol 10 (21) ◽  
pp. 2663
Author(s):  
Raavi Satish ◽  
Kanchapogu Vaisakh ◽  
Almoataz Y. Abdelaziz ◽  
Adel El-Shahat
Keyword(s):  
Radial Distribution ◽  
Power Flow ◽  
Distribution Networks ◽  
Flow Solution ◽  
Three Phase ◽  
Harmonic Pollution ◽  
Flow Algorithm ◽  
Non Linear ◽  
Radial Distribution Networks ◽  
Harmonic Power

Due to the rapid advancement in power electronic devices in recent years, there is a fast growth of non-linear loads in distribution networks (DNs). These non-linear loads can cause harmonic pollution in the networks. The harmonic pollution is low, and the resonance problem is absent in distribution static synchronous compensators (D-STATCOM), which is the not case in traditional compensating devices such as capacitors. The power quality issue can be enhanced in DNs with the interfacing of D-STATCOM devices. A novel three-phase harmonic power flow algorithm (HPFA) for unbalanced radial distribution networks (URDN) with the existence of linear and non-linear loads and the integration of a D-STATCOM device is presented in this paper. The bus number matrix (BNM) and branch number matrix (BRNM) are developed in this paper by exploiting the radial topology in DNs. These matrices make the development of HPFA simple. Without D-STATCOM integration, the accuracy of the fundamental power flow solution and harmonic power flow solution are tested on IEEE−13 bus URDN, and the results are found to be precise with the existing work. Test studies are conducted on the IEEE−13 bus and the IEEE−34 bus URDN with interfacing D-STATCOM devices, and the results show that the fundamental r.m.s voltage profile is improved and the fundamental harmonic power loss and total harmonic distortion (THD) are reduced.

Harmonic Analysis of Three-phase Fixed Capacitor–thyristor Controlled Reactor under Balanced and Unbalanced Conditions

2018 ◽  
Vol 7 (1) ◽  
pp. 67
Author(s):  
Jayababu Badugu ◽  
Y. P.Obulesu ◽  
Ch. Saibabu
Keyword(s):  
Power Systems ◽  
Harmonic Analysis ◽  
Reactive Power ◽  
High Reliability ◽  
Voltage Waveform ◽  
Current Harmonics ◽  
Three Phase ◽  
Harmonic Filter ◽  
Harmonic Pollution ◽  
Thyristor Controlled Reactor

Three-phase Fixed Capacitor Thyristor Controlled Reactor is widely used for reactive power compensation in power systems because of reduced cost and high reliability.  The problem with FC-TCR is that to generate current harmonics when it is partially conducting. When this harmonic current is interacted with system impedance, voltage waveform will distorted. This harmonic pollution is undesirable in power systems. Therefore, it is important to know the harmonic behaviour of three-phase FC-TCR before they can be used in a power system network. This paper presents the harmonic analysis of three-phase FC-TCR operating under balanced and unbalanced conditions. This analysis is useful to design the harmonic filter to reduce the harmonic pollution in power systems.The proposed work is implemented in MATLAB environment.

Research on Harmonic of Electric Vehicle Charger Based on Matlab

2013 ◽  
Vol 291-294 ◽  
pp. 882-885
Author(s):  
Lei Zhang ◽  
Jun Liu
Keyword(s):  
Simulation Model ◽  
Electric Vehicle ◽  
Measured Data ◽  
Equivalent Model ◽  
Switching Function ◽  
Nonlinear Resistor ◽  
Three Phase ◽  
Harmonic Pollution ◽  
Charging Stations ◽  
Resistance Value

The charger for the electric vehicle (EV) is a nonlinear device, and will cause harmonic pollution when put into operation. This paper, firstly, analyzes harmonic caused by charger theoretically and defines its equivalent model as a three-phase full-bridge controlled rectifier, getting the characteristics of charger through the Fourier analysis of the switching function. Secondly, this paper builds the simulation model of the charger using Matlab/Simulink and replaces the car battery with a nonlinear resistor with resistance value changing over time. The parameters in the simulation model are the same as the charging stations in use and the results verify the charger’s harmonic characteristics. Finally, compared with the measured data, the results show the simulation model is suitable for engineering calculations.

Three-Phase Magnitude Detection Based on Decoupling Positive and Negative Sequences of Double D-Q Transformation

2013 ◽  
Vol 765-767 ◽  
pp. 2101-2104
Author(s):  
Xiao Ying Zhang ◽  
Zheng Jiang ◽  
Zhong Jian Zhou
Keyword(s):  
Time Lapse ◽  
Fundamental Wave ◽  
The Novel ◽  
Negative Sequence ◽  
Synchronous Reference Frame ◽  
Three Phase ◽  
Harmonic Pollution ◽  
Sequence Components ◽  
Novel Method ◽  
The Impact

This paper introduces T/4 time-lapse elimination detection, a novel method of detecting three-phase magnitude based on double d-q synchronous reference frame, functioning in decoupling positive and negative sequences of fundamental wave. When the voltage (or current) fundamental positive and negative sequence components are separated, their magnitudes can be detected respectively, so it is effective to restrain the impact on detection precision from negative sequence component. To verify the performance of this novel method, simulation experiments like transient response under normal grid condition and dynamic response under three-phase unbalance with harmonic pollution condition is finished. The results indicate that the novel method obtains a high precision of measure and a better dynamic property and has advantages on preventing harmonic propagation compared with T/16 time-lapse elimination detection method. Thus it can be wildly applied in three-phase power electronic devices.

scholarly journals High Ripples Reduction in DTC of Induction Motor by Using a New Reduced Switching Table

2016 ◽  
Vol 67 (3) ◽  
pp. 206-211 ◽  
Author(s):  
Bachir Mokhtari ◽  
Mohamed F. Benkhoris
Keyword(s):  
Induction Motor ◽  
Torque Ripple ◽  
Additional Cost ◽  
Flux Control ◽  
Matlab Simulink ◽  
Three Phase ◽  
Good Improvement ◽  
Electrical Motors ◽  
Stator Flux ◽  
The Many

Abstract The direct torque and flux control (DTC) of electrical motors is characterized by ripples of torque and flux. Among the many solutions proposed to reduce them is to use modified switching tables which is very advantageous; because its implementation is easy and requires no additional cost compared to other solutions. This paper proposes a new reduced switching table (RST) to improve the DTC by reducing harmful ripples of torque and flux. This new switching table is smaller than the conventional one (CST) and depends principally at the flux error. This solution is studied by simulation under Matlab/Simulink and experimentally validated on a testbed with DSPACE1103. The results obtained of a DTC with RST applied to a three-phase induction motor (IM) show a good improvement and an effectiveness of proposed solution, the torque ripple decreases about 47% and 3% for the stator flux compared with a basic DTC.

scholarly journals Modelling of Stator Coil–To–Ground Faults in Induction Motor

2021 ◽  
Vol 19 ◽  
pp. 396-401
Author(s):  
Stanislav Kocman ◽  
◽  
Pavel Pecínka
Keyword(s):  
Induction Motors ◽  
Stator Winding ◽  
Simple Construction ◽  
Squirrel Cage ◽  
Three Phase ◽  
Simulation Results ◽  
Ground Faults ◽  
Electrical Motors ◽  
Very High ◽  
Actual Point

Three–phase squirrel cage induction motors are the most widespread types of electrical motors which can be found in both industrial and tertiary applications. There are some reasons why they are so often used, such as simple construction, nearly maintenance-free, advantageous price and the possibility to feed them directly from the AC network. Even if their reliability is very high, some unexpected breakdowns can occur during their operation. In this paper, coil–to–ground faults of motor stator winding have been taken into consideration. These failures have been modelled in several points of one stator phase using COMSOL software. As seen from simulation results these failures have a significant impact on current distribution in stator phases causing changes in rotor currents, motor inner torque, speed, etc., depending strongly on the actual point of the failure.

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