scholarly journals Deliberations about three-phase PLL technologies applied to a grid control of the renewable power system

2015 ◽  
Vol 63 (1) ◽  
pp. 261-267 ◽  
Author(s):  
L. Liu ◽  
C. Liu
Keyword(s):  
Power System ◽  
Voltage Drop ◽  
Phase Voltage ◽  
Two Phase ◽  
Voltage Distortion ◽  
Renewable Power ◽  
Grid Connection ◽  
System A ◽  
Three Phase ◽  
Frequency Phase

Abstract An efficient phase locked loop (PLL) method is very important to improve the grid-connected efficiency and the locked speed of frequency, phase, and voltage. However, most of literatures only introduce one PLL or one modified PLL method. There are many grid faults due to the grid connection to the renewable power generating system. A comparison and analysis is very important to select the most effective PLL technology for the grid-connected control of the renewable power system. Three PLL technologies are compared at different grid faults, such as single phase voltage drop, two phase voltage drop, frequency deviation, and voltage distortion. Simulation results indicated that different PLL methods have different locked performances at different grid faults.

Multiagent structures in hybrid renewable power system: A review

2015 ◽  
Vol 7 (6) ◽  
pp. 063101 ◽  
Author(s):  
A. Ranjeeta Khare ◽  
B. Yogendra Kumar
Keyword(s):  
Power System ◽  
Renewable Power ◽  
System A

scholarly journals A novel out of step relaying algorithm based on wavelet transform and a deep learning machine model

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Jigneshkumar Pramodbhai Desai ◽  
Vijay Hiralal Makwana
Keyword(s):  
Deep Learning ◽  
Wavelet Transform ◽  
Power System ◽  
Large Scale ◽  
Half Cycle ◽  
Synchronous Generators ◽  
Power Swing ◽  
Renewable Power ◽  
Three Phase ◽  
Feed Forward Network

AbstractOut-of-step protection of one or a group of synchronous generators is unreliable in a power system which has significant renewable power penetration. In this work, an innovative out-of-step protection algorithm using wavelet transform and deep learning is presented to protect synchronous generators and transmission lines. The specific patterns are generated from both stable and unstable power swing, and three-phase fault using the wavelet transform technique. Data containing 27,008 continuous samples of 48 different features is used to train a two-layer feed-forward network. The proposed algorithm gives an automatic, setting free and highly accurate classification for the three-phase fault, stable power swing, and unstable power swing through pattern recognition within a half cycle. The proposed algorithm uses the Kundur 2-area system and a 29-bus electric network for testing under different swing center locations and levels of renewable power penetration. Hardware-in-the-loop (HIL) tests show the hardware compatibility of the developed out-of-step algorithm. The proposed algorithm is also compared with recently reported algorithms. The comparison and test results on different large-scale systems show that the proposed algorithm is simple, fast, accurate, and HIL tested, and not affected by changes in power system parameters.

On-grid Photovoltaic Power System for Governmental Office Electrification

2021 ◽  
Vol 3 (2) ◽  
pp. 45-52
Author(s):  
Ali Nasser Hussain ◽  
Zuhair Sameen Shuker ◽  
Majid Khudair Abbas Al-Tamimi ◽  
Mimouna Abid
Keyword(s):  
Renewable Energy ◽  
Solar Energy ◽  
Power System ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Solar Panels ◽  
Battery System ◽  
Daily Average ◽  
Renewable Power ◽  
Grid Connection

Solar energy is one of the most promising renewable energy sources. The potential solar energy has a capacity to meet all energy requirements for human survival on planet earth. Some applications such as a thermoelectric generator, electric power generation with the assistance of solar panels and water applications are required to reduce the demand for electricity generated by conventional power plants. The current work evaluates the effectiveness of solar energy for supplying the police building located in Diyala, Iraq. The installed renewable power system consists of photovoltaic/ battery system set with grid connection installed on the roof of the building with a capacity of 5.52 kWp and battery unit (200 A, 48 Volt). Based on the daily average load kWh and daily average solar irradiance for the selected site (4.3 kWh/m2), the results of the energy generated by the system for two selected days showed that for a sunny day is about (11.63 kWh) and for party cloudy day is about (8.02 kWh). The average of energy fed to the grid for a sunny day was recorded more by more than 3.0 kWh and for party cloudy day by more than 4.0 kWh.  The system installed at the first day of February of the year 2021. The obtained results encourage to install of photovoltaic systems in the selected site which can feed such facilities with renewable energy and deliver energy to the grid.

Novel Two-Phase PWM Scheme for Three-Phase Voltage-Fed Converter

2012 ◽  
Vol 132 (9) ◽  
pp. 940-941 ◽  
Author(s):  
Shin-ichi Motegi ◽  
Shigeo Masukawa ◽  
Yasuyuki Nishida
Keyword(s):  
Phase Voltage ◽  
Two Phase ◽  
Three Phase

Current predictive control of three-phase voltage source PWM rectifiers under unbalanced grid voltage conditions

2016 ◽  
Vol 39 (7) ◽  
pp. 976-986
Author(s):  
Meng Wang ◽  
Yanyan Shi ◽  
Zhen Qi ◽  
Minghui Shen
Keyword(s):  
Predictive Control ◽  
Control Strategy ◽  
Voltage Source ◽  
Phase Voltage ◽  
Two Phase ◽  
Grid Voltage ◽  
Three Phase ◽  
Pwm Rectifiers ◽  
Current Error ◽  
Unbalanced Grid

To improve the performance of three-phase voltage source pulse-width modulated (PWM) rectifiers (VSR) under unbalanced grid voltage conditions, a fixed-frequency current predictive control (CPC) strategy is presented. Instantaneous power of the three-phase VSR is analysed in a two-phase stationary frame. The calculation method for the reference current is improved to achieve the power stability at the AC side of the rectifier. Based on the current predictive model, the optimal duration of the voltage vectors is computed under the restricted condition of minimizing current error at α- and β-axes in fixed intervals. The control system is free of synchronous rotation coordinate transformation, and avoids positive and negative sequence decomposition, which simplifies the calculation. The simulation and experimental results show that the proposed control strategy is able to eliminate the AC current distortion effectively and depress DC link voltage fluctuation under unbalanced grid voltage. Furthermore, the control strategy has faster dynamic response ability, enhancing the control performance of the three-phase VSR system.

scholarly journals A Buffer Power Source Based on a Supercapacitor for Starting an Induction Motor under Load

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4769
Author(s):  
Ruslan Saifulin ◽  
Tomasz Pajchrowski ◽  
Iosiff Breido
Keyword(s):  
Electric Drive ◽  
Voltage Drop ◽  
Electric Energy ◽  
Power Source ◽  
Two Phase ◽  
Industrial Networks ◽  
Start Up ◽  
Buffer Power ◽  
Three Phase ◽  
Induction Electric Drive

In the paper, a model of a three-phase frequency-controlled induction electric drive has been developed in Simulink Matlab 2019 (MathWorks, Natick, MA, USA). This model is mathematically converted into a two-phase model by transforming equations. It is proposed to compensate the voltage drop in the power system during start-up operation under load by using supercapacitors as a buffer power source. A block of supercapacitors was calculated. Simulation modeling was performed at a different voltage than the network. The diagrams of the transient processes occurring in the electric drive when the power supply is changed were prepared. It was found that such a principle of implementing an additional source of electric energy allows to start induction electric drives in areas remote from industrial networks without significantly affecting their static and dynamic characteristics.

scholarly journals Design and implementation of automatic phase changer

2021 ◽  
Author(s):  
Md Atiqul Islam
Keyword(s):  
Power System ◽  
Phase Voltage ◽  
Design And Implementation ◽  
Automatic Phase ◽  
Three Phase ◽  
Operation Results ◽  
Proper Operation ◽  
Correct Level ◽  
Three Phases

Simulation of an Automatic Phase Changer (APC) circuit was performed in this project. The simulation was carried out using Proteus 8. Automatic Phase Changer (APC) automatically changes the phase as the name suggests. In three phase power system 3 inputs of APC circuit are connected to three phases of the system and its three outputs are connected to three different loads. These three loads always need their normal rated voltage for proper operation. Results observed that if voltage of any phase goes below the nominal rating the loads may malfunction. Here, Automatic Phase Changer comes into action. When a phase voltage goes below its nominal rating, APC provides correct level of voltage to the load connected to that phase.

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