Analysis of Five-Level DSTATCOM for Harmonic Reduction in Power System Due To Non-Linear Loads

2016 ◽  
Vol 4 (2) ◽  
pp. 286
Author(s):  
N. Raveendra ◽  
V. Madhusudhan ◽  
A. Jayalaxmi
Keyword(s):  
Simulation Modelling ◽  
Variable Load ◽  
Linear Type ◽  
Matlab Simulink ◽  
Harmonic Reduction ◽  
Harmonic Elimination ◽  
Non Linear ◽  
Source Current ◽  
Coupling Point ◽  
Load Simulation

<p class="AEEEAbstract"><strong></strong>This paper deals with the elimination of harmonics at PCC in the presence of non-linear type of loads. Introduction of five-level DSTATCOM at PCC injects compensating currents for the minimization of harmonic content in the source currents. Non-linear loads when connected to the system draw non-linear components of current leaving undesired harmonics at the source side. DSTATCOM when connected to the system at the coupling point induces compensating currents to nullify harmonics. This paper introduces the simulation modelling of five-level DSTATCOM for harmonic elimination. Matlab/Simulink  modelling was done for the system without DSTATCOM and its harmonic contents were shown. The system without DSTATCOM is compared with the system with the presence of DSTATCOM showing their respective THD in the source current. Five level DSTATCOM was validated by considering fixed load and variable load. Simulation work was carried out for three types of systems and results were obtained using Matlab/Simulink.</p>

Harmonic Elimination Using STATCOM for SEIG Fed Induction Motor Load

2017 ◽  
Vol 8 (3) ◽  
pp. 1026
Author(s):  
Satyanarayana Gorantla ◽  
Goli Ravi Kumar
Keyword(s):  
Induction Motor ◽  
Distribution System ◽  
Load Current ◽  
Synchronous Reference Frame ◽  
Harmonic Elimination ◽  
Non Linear ◽  
Source Current ◽  
Motor Load ◽  
Non Linear Load ◽  
Induction Motor Load

Non-linear loads connected to distribution system induce harmonics in to source components and the presence of harmonics in source components affects the performance of other sensitive loads connected at the same point. Induction motor load for drive system should be operated with variable frequency and variable voltage for its speed control. To vary the voltage and frequency, induction motor is fed from an inverter. This total drive set-up constitutes non-linear load type and will be the source of harmonics. This paper depicts the suppression of harmonics with STATCOM in distribution system when induction motor load is fed from SEIG (singly excited inductin generator). STATCOM is controlled with simple synchronous reference frame theory and the results are shown for source current, load current. THD in source current and load current was also shown for the said system. System for single-phase and three-phase induction motor drive was developed and results are shown using MATLAB/SIMULINK software.

Adaptive Method for Power Quality Improvement through Minimization of Harmonics Using Artificial Intelligence

2017 ◽  
Vol 8 (1) ◽  
pp. 470 ◽  
Author(s):  
P. Thirumoorthi ◽  
Raheni T D
Keyword(s):  
Artificial Intelligence ◽  
Power System ◽  
Power Quality ◽  
Active Power Filter ◽  
Pi Controller ◽  
Active Power ◽  
Shunt Active Power Filter ◽  
Power Filter ◽  
Non Linear ◽  
Source Current

Power system harmonics are a menace to electric power system with disastrous consequence. Due to the presence of non linear load, power quality of the system gets affected.  To overcome this, shunt active power filter have been used near harmonic producing loads or at the point of common coupling to block current harmonics. The shunt active power filter is designed to minimize harmonics in source current and reactive power in the non linear power supplies which are creating harmonics. In this paper, Instantaneous power of p-q theory is employed to generate the reference currents and PI controller is used to control the dc link voltage. In addition to this, Artificial Intelligence (AI) technique is used to minimize the harmonics produced by nonlinear load. The main objective of this paper is to analyze and compare THD of the source current with PI controller and by artificial neural network based back propagation algorithm. The proposed system is designed with MATLAB/SIMULINK environment.

Simulation Modelling of a Pulse Frequency-Phase Discriminator

2015 ◽  
Vol 792 ◽  
pp. 95-100 ◽  
Author(s):  
Igor S. Bolgov ◽  
Yuriy N. Dementyev ◽  
Veronika A. Bolgova
Keyword(s):  
Simulation Model ◽  
Simulation Modelling ◽  
Pulse Frequency ◽  
Matlab Simulink ◽  
Application Package ◽  
Simulation Results ◽  
Frequency Phase ◽  
Phase Discriminator

A simulation model of a pulse frequency-phase discriminator (PFPD) in the Matlab Simulink application package was developed. The main PFPD modes simulation and the analysis results were carried out. The simulation results are discussed in this paper.

Statistical Analysis of Fundamental Periods of Frame Structures

2012 ◽  
Vol 226-228 ◽  
pp. 1174-1180 ◽  
Author(s):  
Yan Qiang Gao ◽  
Wen Feng Liu
Keyword(s):  
Seismic Design ◽  
Exponential Type ◽  
Empirical Formula ◽  
The United States ◽  
Fundamental Period ◽  
Frame Structures ◽  
Single Variable ◽  
Empirical Formulas ◽  
Linear Type ◽  
Non Linear

The differences of empirical formulas of China, the United States, Japan, and Europe for estimating the fundamental periods of frame structures are investigated. Summing up paradigms of the empirical formulas from the above representation countries, the paradigm formulas expressed as single-variable exponential type, single-variable linear type, and multi-variable non-linear type. Using statistical data of 36 groups of the measured fundamental period for least-squares regression analysis, and the effect of fitting regression formula is judged by the norm of relative error ‖δ‖2, the norm of root mean square error ‖RMSE‖2, the norm of residual mass‖CRM‖2. The results show that: the single-variable exponential type has wide application and gets closer with measured fundamental period; the single-variable linear type is brief, and the single-variable based on structural height has a smaller error with measured fundamental period, the single-variable based on the stories of structures has a larger error with measured fundamental period; the multi-variable non-linear type is very complex and larger error compared with the measured fundamental period. Considering the formula in the form of simple, practical and consistent with the codes, this paper gives single-variable exponential type as recommended empirical formula for estimating the fundamental periods of frame structures .The proposed empirical formula can serve as a reference for revision of the seismic design code, frame structure seismic design and related studies.

scholarly journals Fixed Point Results for K-Iteration Using Non-Linear Type Mappings

OALib ◽  
2019 ◽  
Vol 06 (03) ◽  
pp. 1-14
Author(s):  
Anju Panwar ◽  
Ravi Parkash Bhokal
Keyword(s):  
Fixed Point ◽  
Linear Type ◽  
Non Linear

scholarly journals Unified Power Flow Controller for Non-Linear Loads Using Adaptive Power Quality Theory

2019 ◽  
Vol 9 (2) ◽  
pp. 61-67
Author(s):  
Jaya Raju Gaddala ◽  
Sambasiva Rao Gudapati
Keyword(s):  
Power Quality ◽  
Power Flow ◽  
Reactive Power ◽  
Unified Power Flow Controller ◽  
Q Theory ◽  
Non Linear ◽  
Source Current ◽  
Flow Controller ◽  
Power Flow Controller ◽  
Load Conditions

Harmonics reduction techniques in source current were found to be unreliable and imbalanced with different load conditions. This certain unreliability problem in harmonics mitigation is caused by non-linear loads. The harmonics and power quality problems are eliminated by filters. These filters are expensive to provide a dynamic response under various load conditions. The new unified power flow controller composed of a series and shunt compensator provides more secured power systems and good voltage stability at various load conditions. D-Q theory is used to generate the reference current from the AC source current. D-Q theory produces sinusoidal harmonics that are opposite to load harmonics. This UPFC can absorb or inject reactive power in the PCC. D-Q theory followed by a hysteresis current controller generates PWM pulses to the shunt and series compensator. The PI and fuzzy logic controllers preserve the DC link voltage in the storage capacitor. The proposed technique has been simulated by using Matlab simulation under different load conditions.

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