Virtual Instrument for Measurement of Power Quality in Unbalanced Three Phase System

2018 ◽  
Author(s):  
Subhra De ◽  
Sudipta Debnath
Keyword(s):  
Power Quality ◽  
Virtual Instrument ◽  
Phase System ◽  
Three Phase

scholarly journals Hardware for classification of power quality problems in three phase system using Microcontroller

2017 ◽  
Vol 4 (1) ◽  
pp. 1386364 ◽  
Author(s):  
S. Asha Kiranmai ◽  
A. Jaya Laxmi ◽  
Qingsong Ai
Keyword(s):  
Power Quality ◽  
Phase System ◽  
Three Phase

scholarly journals Design and analysis of a Three Phase Transformerless Hybrid Series Active Power Filter based on sliding mode control using PQ-theory and stationary reference frames

2019 ◽  
Vol 16 (3) ◽  
pp. 289-310 ◽  
Author(s):  
Vinay Naguboina ◽  
Satish Gudey
Keyword(s):  
Power Quality ◽  
Single Phase ◽  
Sliding Mode ◽  
Active Power Filter ◽  
Constant Load ◽  
Active Power ◽  
Phase System ◽  
Load Voltage ◽  
Power Filter ◽  
Three Phase

In this work, a Three phase Transformerless Hybrid Series Active Power Filter (THSeAF) based on Sliding Mode Control (SMC) is proposed to mitigate the voltage and current distortions present in an electrical distribution systems (EDS). A Sliding Mode Controller is designed by controlling the parameters present on the load side as well as source side of the system. Three separate voltage source converters (VSC) are used. The mod1elling of the system is derived by considering a single-phase system by using state space analysis. The frequency response characteristics have been derived for the single-phase system and the stability of the system is studied. It is observed that the system has good stability margins when the SMC is applied at the source side compared to load side. Simulation results obtained in PSCAD/EMTDC v4.6 have been observed for power quality issues like voltage sags, voltage swells, voltage distortions, voltage unbalances and their concurrent occurrence. The approach of stationary reference frame was used for source side control and PQ theory is used for load side control. It is observed that the proposed controller works well in obtaining a stable and constant load voltage during these power quality issues. The difference in settling time observed is around 4 ms for the load side and source side control. The THD present in the load voltage is near about 1%. The SMC is found to be robust in obtaining a constant load voltage with low THD and an improved power factor.

scholarly journals SCRIPT FILES APPROACH IN THE POWER QUALITY EVENTS GENERATION

2018 ◽  
Vol 17 (2) ◽  
pp. 93
Author(s):  
Dragan Živanović ◽  
Milan Simić ◽  
Dragan Denić ◽  
Živko Kokolanski
Keyword(s):  
Power Quality ◽  
Virtual Instrument ◽  
Quality Standards ◽  
Signal Generation ◽  
Phase Voltage ◽  
Virtual Instrumentation ◽  
Specific Test ◽  
Three Phase ◽  
Long Time ◽  
Flexible Generation

Generation of typical power quality (PQ) events, based on Script files and virtual instrumentation, is presented in this paper. Such approach provides definition and generation of three-phase voltage signals with various PQ events defined according to relevant international quality standards. Using of Script files enables easy and flexible generation of long-time voltage signals with complex PQ disturbances, according to the predefined test algorithms and scenarios. Detailed front panels and block diagrams of developed virtual instrument for signal generation are described in the paper. As specific examples, generated signals defined using the Script files are presented. Experimental confirmation of described software supported method is performed using the three-phase PQ analyzer Fluke 435. Some specific test waveforms and obtained experimental results are shown.

scholarly journals Area-Based Approach in Power Quality Assessment

2008 ◽  
Vol 2008 ◽  
pp. 1-6 ◽  
Author(s):  
Surajit Chattopadhyay ◽  
Samarjit Sengupta ◽  
Madhuchhanda Mitra
Keyword(s):  
Power Quality ◽  
Quality Parameters ◽  
Computational Effort ◽  
Phase System ◽  
Transformation Technique ◽  
Three Phase ◽  
Harmonic Voltage ◽  
Park Transformation ◽  
Harmonic Components ◽  
Good Agreement

This paper presents an approach for assessment of power quality parameters using analysis of fundamental and harmonic voltage and current waveforms. Park transformation technique has been utilized for the analysis in three-phase system, which has reduced the computational effort to a great extent. Contributions of fundamental and harmonic components in power system voltage and current signals have been assessed separately. An algorithm has been developed to calculate the power quality parameters from online signals. This algorithm has been simulated for a radial system, and the results have been compared with that obtained from a standard FFT-based system. The results are seen to be in good agreement with that of the standard system.

Measurement and Analysis on Power Quality of Electric Railway Traction Substation Based on LabVIEW

2011 ◽  
Vol 383-390 ◽  
pp. 5034-5039
Author(s):  
Yang Yu Hu ◽  
Hong Jun Fu ◽  
Jun Yong Wu ◽  
Lu Yu Ji ◽  
Xi Lu Zhang
Keyword(s):  
Power Quality ◽  
Virtual Instrument ◽  
High Speed ◽  
Harmonic Distortion ◽  
Measuring System ◽  
National Standard ◽  
Three Phase ◽  
Railway Traction ◽  
Calculation Results ◽  
Electric Railway

A general power quality measuring system based on virtual instrument (LabVIEW) has been developed. For two electric railway traction transformers of Zhengzhou-Xi’an High Speed Passenger Dedicated Line, which access to Zhengzhou, Henan Grid, some important power quality parameters have been measured and analyzed. Then, the analysis results are compared with the calculation results by Power System Harmonic Penetration Software (PSHP), which is developed by our group. It shows that real measured data of Harmonic Ratio and Three-phase Unbalanced Factor of electric railway traction substations is comparable well with the calculation results. Furthermore, Three-phase Current Unbalanced Factor accorded well with the theoretical value of the V/v-connected traction transformer, and Total Voltage Harmonic Distortion and Unbalanced Factor meet the requirements of relative national standard.

scholarly journals Effective Renewable Source Integration using Unified Power Quality Conditioner with Power Quality Enhancement in Three Phase System

2018 ◽  
Vol 225 ◽  
pp. 05014 ◽  
Author(s):  
P. Suresh ◽  
T. Gowri Manohar
Keyword(s):  
Power Quality ◽  
Control Strategy ◽  
Reactive Power ◽  
Phase System ◽  
Nonlinear Loads ◽  
Renewable Source ◽  
Active Power Filters ◽  
Unified Power Quality Conditioner ◽  
Three Phase ◽  
Power Quality Conditioner

This paper proposes a modified control strategy for unified Power Quality conditioner to alleviate voltage and current abnormalities in three phase system. Renewable source integration and nonlinear loads depreciates Power Quality of the system. Active Power Filters play a paramount role in alleviating PQ disturbances. To deal with current imperfections and reactive power compensation, modified dq controller is proposed for shunt controller. ANFIS-dq control strategy is proposed for Series Controller to suppress voltage imperfections Photovoltaic unit is optimally connected at DC link of UPQC for supporting controlling action and to deliver real power Proposed optimal renewable source integrated UPQC performance is studied with traditional PI and ANFIS controller. MATLAB / SIMULINK platform is used for analyzing proposed system performance.

scholarly journals Performance analysis of LMS based control algorithm for power quality improvement in three phase grid connected system for linear/non-linear load

2019 ◽  
Vol 10 (4) ◽  
pp. 1944
Author(s):  
Mohmmad Ahmad ◽  
Sheeraz Kirmani
Keyword(s):  
Power Quality ◽  
Phase Distribution ◽  
Phase System ◽  
Least Mean Square ◽  
Inductive Load ◽  
Nonlinear Load ◽  
Linear Load ◽  
Three Phase ◽  
Non Linear ◽  
Non Linear Load

<p>This paper presents the adaptive filtering based least mean square control<br />algorithm for distribution static compensator (DSTATCOM) in three-phase<br />grid tied system for linear/non-linear load, to solve the power quality<br />problems caused by solid-state equipment and devices. This is shown that the<br />active component weights obtained from the load currents in the LMS<br />adaptive filter are used to produce the reference currents and subsequently<br />produces the switching pulses for VSC of the compensator. The complete<br />circuit along with the adaptive technique and diode bridge rectifier type nonlinear load is simulated in Matlab/Simulink software. Initially the circuit was<br />simulated for a three phase linear inductive load. Later it was simulated for a<br />rectifier load connected at PCC with a disconnection of the load of any phase<br />for a short duration of time. It is concluded that the harmonics are found<br />within the limit. The harmonics and power results for both types of loads are<br />compared in a tabular form. Hence this three phase system with<br />DSTATCOM improves the power quality in the three-phase distribution<br />network therefore, serves to provide harmonics reduction, load balancing and<br />regulating the terminal voltage at the point of common coupling (PCC).</p>

Power quality improvement in a photovoltaic based microgrid integrated network using multilevel inverter

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Balaram Das ◽  
Pratap K. Panigrahi ◽  
Soumya R. Das ◽  
Debani P. Mishra ◽  
Surender Reddy Salkuti
Keyword(s):  
Power Quality ◽  
Reactive Power ◽  
Sliding Mode ◽  
Current Control ◽  
Integrated System ◽  
Multilevel Inverter ◽  
Phase System ◽  
Proposed Model ◽  
Three Phase ◽  
Bus Voltage

Abstract The increasing use of power electronics devices as well as the integration of renewable source-based microgrids (MG) has seriously affects the power quality (PQ) of the three-phase power system. Therefore, for the improvement of PQ, it is required to reduce the total harmonics distortion (THD) in the utility network. In this work, the improvement of PQ is discussed in a photovoltaic (PV) based MG integrated three-phase system using a three-level H-bridge (3LHB) multilevel inverter (MI). The MI is used for compensating the source current harmonics and reducing the THD by meeting the IEEE standard guidelines. Besides, the proposed model helps manage the reactive power with control of DC link bus voltage through the PV system. The proposed model is helpful not only in reducing the harmonics but also in providing additional active power to the load if any electrical disturbances occur on the grid side. The maximum power point tracking (MPPT) technique employed in PV is of an improved form of Perturb and Observe (P&O). Further, the reference current generation is derived using the direct current control (DCC) and indirect current control (ICC) techniques. The MG integrated MI is investigated in both DCC and ICC method using three different DC bus voltage controllers; proportional-integral (PI), fuzzy logic controller (FLC), and fuzzy sliding mode control (FSMC). The proposed microgrid integrated system is analyzed with the MATLAB/Simulink tool.

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