A Three-phase to Seven-phase Energy Transformation under Unbalanced Supply Voltage

2018 ◽  
Author(s):  
Md Tabrez ◽  
Pradip Kumar Sadhu ◽  
Atif Iqbal ◽  
Farhad Ilahi Baksh
Keyword(s):  
Power Transmission ◽  
Supply Voltage ◽  
Power Input ◽  
Phase System ◽  
Ac Power ◽  
Three Phase ◽  
Sequence Components ◽  
Definition Of ◽  
And Control ◽  
Generation Power

In the recent past, multiphase power generation, power transmission, and electrical drive system are the main focus of research due to their several advantages over three phase. Multiphase drives have better performance over three-phase drives. A multiphase transformer is required at the input of a fixed frequency multiphase drive, rectifier circuit for HVDC applications and multiphase generation and transmission systems. This paper investigates a static three to seven phase conversion technique and presents a design of transformer and control strategy to analyze the effect of unbalanced supply on a three phase to seven phase transformer. The transformer so designed takes three phase as input and seven phase output is obtained at the secondary terminals. The paper also discusses input-output unbalancing. A complete design, analysis, simulation of the proposed technique and experimental validation is presented in this paper. Experimental and simulation results prove that the presented design produced a seven-phase from a tree-phase ac power. Input unbalance is reflected to output but is less than the input unbalance. A seven phase output is not produced if one phase of input is open and the transformer has more than three limbs for flux to flow. A balanced seven phase output in steady state is produced even in one phase open condition for a three limb core type transformer. A new definition of sequence components of an unbalanced seven phase system is defined in this paper.

Operation and Control of a DVR in the Presence of Interharmonics

2008 ◽  
Vol 9 (1) ◽  
Author(s):  
Amit Kumar Jindal ◽  
Arindam Ghosh ◽  
Avinash Joshi
Keyword(s):  
Supply Voltage ◽  
Voltage Sag ◽  
Simulation Studies ◽  
Dynamic Voltage Restorer ◽  
Voltage Restorer ◽  
Three Phase ◽  
Sequence Components ◽  
Dynamic Voltage ◽  
Computer Simulation Studies ◽  
And Control

The paper discusses the operating principles and control characteristics of a dynamic voltage restorer (DVR). It is assumed that the source voltages contain interharmonic components in addition to fundamental components. The main aim of the DVR is to produce a set of clean balanced sinusoidal voltages across the load terminals irrespective of unbalance, distortion and voltage sag/swell in the supply voltage. An algorithm has been discussed for extracting fundamental phasor sequence components from the samples of three-phase voltages or current waveforms having integer harmonics and interharmonics. The DVR operation based on extracted components is demonstrated. The switching signal is generated using a deadbeat controller. It has been shown that the DVR is able to compensate these interharmonic components such that the load voltages are perfectly regulated. The DVR operation under deep voltage sag is also discussed. The proposed DVR operation is verified through the computer simulation studies using the MATLAB software package.

scholarly journals Unified Power Flow Controller Based on Autotransformer Structure

Electronics ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 1542
Author(s):  
Hyun-Jun Lee ◽  
Dae-Shik Lee ◽  
Young-Doo Yoon
Keyword(s):  
Power Flow ◽  
Single Phase ◽  
Low Voltage ◽  
Power Converter ◽  
Unified Power Flow Controller ◽  
Phase System ◽  
Three Phase ◽  
Flow Controller ◽  
And Control ◽  
Power Flow Controller

This paper proposes a new unified power flow controller (UPFC) topology. A single phase of them system with the proposed topology consists of an N:2 transformer with a center tap at the low-voltage side and a power converter module comprising full- and half-bridge converters. A three-phase system can be implemented with three devices. While the conventional UPFC topology uses two three-phase transformers, which are called series and parallel transformers, the proposed topology utilizes three single-phase transformers to implement a three-phase UPFC system. By using an autotransformer structure, the power rating of the transformers and the voltage rating of switches in the power converter module can be significantly decreased. As a result, it is possible to reduce the installation spaces and costs compared with the conventional UPFC topology. In addition, by adopting a full- and half-bridge converter structure, the proposed topology can be easily implemented with conventional power devices and control techniques. The techniques used to control the proposed topology are described in this paper. The results obtained from simulations and experiments verify the effectiveness of the proposed UPFC topology.

scholarly journals A Novel Fast Voltage Sequence Component Detector of Unbalanced Three-Phase System

2018 ◽  
Vol 173 ◽  
pp. 01036
Author(s):  
Baohong Jiang ◽  
Xinian Li
Keyword(s):  
Reference Frame ◽  
Traditional Method ◽  
Phase System ◽  
Detection Time ◽  
Continuous Processing ◽  
Synchronous Reference Frame ◽  
Three Phase ◽  
Rotating Reference Frame ◽  
Sequence Components ◽  
Simulation Results

The fast and accurate voltage sequence component detection of unbalanced three-phase system is of major importance for the industrial continuous processing. The traditional method is to calculate the voltage in dq synchronous reference frame. This results in low order harmonics and long detection time. A novel fast voltage sequence components detector is proposed in this paper. It is to calculate the sequence component projection on dq rotating reference frame with h times the fundamental angular velocity. Simulation results demonstrate the validity of the algorithm.

scholarly journals Accurate Parameter Estimation for Unbalanced Three-Phase System

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Yuan Chen ◽  
Hing Cheung So
Keyword(s):  
Parameter Estimation ◽  
Frequency Estimation ◽  
Nonlinear Least Squares ◽  
Phase System ◽  
Mean Square ◽  
Least Mean Square ◽  
Error Performance ◽  
Control Console ◽  
Three Phase ◽  
And Control

Smart grid is an intelligent power generation and control console in modern electricity networks, where the unbalanced three-phase power system is the commonly used model. Here, parameter estimation for this system is addressed. After converting the three-phase waveforms into a pair of orthogonal signals via theαβ-transformation, the nonlinear least squares (NLS) estimator is developed for accurately finding the frequency, phase, and voltage parameters. The estimator is realized by the Newton-Raphson scheme, whose global convergence is studied in this paper. Computer simulations show that the mean square error performance of NLS method can attain the Cramér-Rao lower bound. Moreover, our proposal provides more accurate frequency estimation when compared with the complex least mean square (CLMS) and augmented CLMS.

scholarly journals Optimization of Single Phase E-Core Hybrid Excitation Flux Switching Machine

2015 ◽  
Vol 773-774 ◽  
pp. 766-770
Author(s):  
Siti Nur Umira Zakaria ◽  
Erwan Sulaiman ◽  
Mohamed Mubin Aizat
Keyword(s):  
Single Phase ◽  
Phase System ◽  
Optimization Approach ◽  
Stator Core ◽  
Three Phase ◽  
Excitation Coil ◽  
Hybrid Excitation ◽  
Configuration Systems ◽  
Field Excitation ◽  
And Control

Research and development on hybrid excitation flux switching machines (HEFSM) for various applications have been carried out in the last years. The designed HEFSM consist of permanent magnet (PM) and DC field excitation coil (DC-FEC) which is located on the stator core as their main flux sources, while a single piece rotor gives the advantages of robust rotor structure. Since most of the designed HEFSMs utilize three-phase windings, more complicated design and control system are required to run the motor. Thus, a new design of single-phase E-Core HEFSM with several advantages of much simpler converter size and smaller battery package due to small voltage capacity when compared with conventional three-phase system is proposed. Consequently, the size of overall configuration systems will also be reduced resulting in reducing total weight and cost. In this paper, initial performances of 4S-4P, 4S-6P, 4S-8P and 4S-10P E-Core HEFSM topologies are analysed. Since 4S-10P design gives highest torque and power performances, deterministic design optimization approach is conducted to enhance much higher and optimum performances. As conclusion, the optimized E-core HEFSM with 4S-10P topology has achieved maximum torque and power of 208.857Nm and 47.31 kW, respectively.

scholarly journals To the problem of mathematical modelling of the three-phase asymmetrical distribution network

2020 ◽  
Vol 22 (1) ◽  
pp. 93-102
Author(s):  
T. T. Omorov ◽  
B. K. Takyrbashev ◽  
R. Ch. Osmonova
Keyword(s):  
Distribution Network ◽  
Complex Form ◽  
State Variables ◽  
Identification Procedure ◽  
Asymmetrical Distribution ◽  
Three Phase ◽  
Automated Meter Reading ◽  
Definition Of ◽  
And Control ◽  
Direct Use

The asymmetrical distribution electric network is considered in the conditions of functioning of the automated meter reading and control system (AMRCS). The problem of identification of its mathematical model in a complex form which comes down to definition of phase shifts of the variables (currents, tension) defining an electric status of three-phase network is formulated. The method of its solution based on the mathematical ratios describing functional communications between state variables and use of algorithms of parameter optimization is offered. The realization of identification procedure of model of a distribution network is enabled with direct use of the basic data obtained on communication channels from subscriber's meters of the electric power. The method can be used for a solution of a number of functional tasks as a part of the AMRCS oriented for diagnostics of statuses of a trunk line and energy losses in a distribution network.

scholarly journals Enhancement of Power Quality in Multi Feeder Three Phase System with Photovoltaic fed ANFIS-Unified Multi Converter Controller

2018 ◽  
Vol 225 ◽  
pp. 03015
Author(s):  
Kasa Sudheer ◽  
Ramasamy Sudha
Keyword(s):  
Power Quality ◽  
Supply Voltage ◽  
Phase System ◽  
Variable Load ◽  
Power Demand ◽  
Renewable Sources ◽  
Substantial Growth ◽  
Three Phase ◽  
Complex Power ◽  
Quality Issues

Substantial growth in modern innovations demands more power from utility. To cope with drastic power demand on grid renewable sources have been integrated. This makes more complex power system as these integrated sources more dynamic in nature. Intelligent usage of renewable sources leads to optimal and reliable power structure. This paper provides an optimal usage of renewable source for unified controlling action to compensate power quality issues on multi distribution feeders. Proposed Unified Multi Converter Controller (UMCC) effectively alleviates power quality issues like harmonics, imperfections in current and voltage on multi feeder. ANFIS based harmonics alleviation is studied and compared with traditional control error tuning. Here, Photovoltaic source is considered. Proposed three phase system is analyzed in MATLAB\SIMULINK platform with variable load and supply voltage conditions.

Sign in / Sign up

Export Citation Format

Share Document