scholarly journals A Comparative Study into Enhancing the PV Penetration Limit of a LV CIGRE Residential Network with Distributed Grid-Tied Single-Phase PV Systems

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2964 ◽  
Author(s):  
Musharraf Wajahat ◽  
Hassan Abdullah Khalid ◽  
Ghullam Mustafa Bhutto ◽  
Claus Leth Bak
Keyword(s):  
Steady State ◽  
Single Phase ◽  
Low Voltage ◽  
Limiting Factor ◽  
Data Set ◽  
Voltage Unbalance ◽  
Novel Approach ◽  
Distribution Scheme ◽  
Ac Networks ◽  
Pv Penetration

Photovoltaic distributed generation (PVDG) has seen tremendous growth in recent years, especially in the residential sector. Among other concerns, the voltage rise in AC networks is considered the most limiting factor in achieving increased PV penetration levels. A steady-state impact study is performed on a CIGRE low-voltage (LV) residential network. This paper compares six techniques to increase the PV penetration limit in the LV residential network, namely single-phase penetration (SPP), Distribution Scheme 1 (DS1), Distribution Scheme 2 (DS2), alternate phase penetration (APP), offline tap adjustment (OTA) and switched on-load tap adjustment (SOLTA). PSCAD software is used for this study. The best results are obtained for the DS2-SOLTA case that gives the minimum voltage magnitude and voltage unbalance in the system. The steady-state results are validated by a dynamic data study using measured solar irradiance and residential load data. A novel approach is also proposed for calculating the worst day from the data set. The obtained results verify the effectiveness of the proposed approach.

scholarly journals Performance analysis of malaysian low voltage distribution network under different solar variability days

2019 ◽  
Vol 13 (3) ◽  
pp. 1152
Author(s):  
Nur Izzati Zolkifr ◽  
Chin Kim Gan ◽  
Meysam Shamsiri
Keyword(s):  
Low Voltage ◽  
Distribution Networks ◽  
Solar Variability ◽  
Pv System ◽  
Voltage Unbalance ◽  
Pv Systems ◽  
Network Losses ◽  
Pv Penetration ◽  
The Impact ◽  
Different Levels

<span>The widespread of Photovoltaic (PV) systems as one of the distributed generation technologies could have profound impact on the distribution networks operation, particularly on network losses and network voltages fluctuations. This is mainly caused by the high PV penetrations coupled with high solar variability in the countries with large cloud cover. Therefore, this paper presents an investigation on the impact of residential grid-connected PV system by utilizing a typical low voltage (LV) network in Malaysia under various solar variability days. In this study, there are three scenarios; where, each scenario were performed with different levels of PV penetration and five different solar variability days. The impacts of PV system allocation in different scenarios and various solar variability days are assessed in term of voltage unbalance and network losses. The results propose that Scenario 1: randomly allocation of PV systems across the LV network has the lowest voltage unbalance and network losses especially during overcast day</span>

Steady-State Operation Analysis for a Three-Winding Single-Phase Capacitor Motor

2015 ◽  
Vol 713-715 ◽  
pp. 1027-1030
Author(s):  
Jin Hui Zeng ◽  
Jian Guo Deng
Keyword(s):  
Mathematical Model ◽  
Steady State ◽  
Power Supply ◽  
Single Phase ◽  
Experimental Results ◽  
Calculation Formula ◽  
Voltage Unbalance ◽  
Operation Analysis ◽  
Steady State Operation ◽  
Simulation Results

The steady-state mathematical model of Smith-connection three-winding single-phase capacitor motor is established, and the capacitance calculation formula in minimum voltage unbalance condition is deduce .Based on this, by MATLAB simulated program, a operation simulation of Smith single phase capacitor motor that in single-phase 220V power supply and in single-phase 380V power supply is developed. The simulation results agree with the experimental results.

scholarly journals Design of Educational Instantaneous Powers Metering Software for Steady-State Single-Phase AC Networks

2011 ◽  
Author(s):  
Rene Wamkeue ◽  
Tommy Andy Theubou Tameghe ◽  
Jean Maurice Nyobe Yome
Keyword(s):  
Steady State ◽  
Numerical Model ◽  
Single Phase ◽  
Reactive Power ◽  
Student Assessment ◽  
Teaching Methodology ◽  
Classical Approach ◽  
Solution Approach ◽  
Ac Networks ◽  
Power Metering

In this paper, instantaneous complex current and voltage for steady-state single-phase alternating-current (AC) circuit are introduced to improve the teaching methodology of instantaneous powers in undergraduate power courses. In contrast to the classical approach using fixed phasors, it is shown in this paper that an instantaneous solution approach also provides interesting results and leads to exact formulations of instantaneous powers. As a step towards building instantaneous reactive-power metering equipment for teaching purposes, a numerical model has been developed using Matlab/Simulink software. The evaluation of the approach by means of a student assessment is also addressed in the paper.

scholarly journals Single-Phase PV Power Injection Limit due to Voltage Unbalances Applied to an Urban Reference Network Using Real-Time Simulation

2018 ◽  
Vol 8 (8) ◽  
pp. 1333 ◽  
Author(s):  
Alexandre Lucas
Keyword(s):  
Real Time ◽  
Single Phase ◽  
Low Voltage ◽  
Power Transformer ◽  
Distribution Networks ◽  
Reference Network ◽  
Power Injection ◽  
Phase Systems ◽  
Real Time Digital Simulator ◽  
Pv Penetration

As photovoltaic (PV) penetration increases in low-voltage distribution networks, voltage variation may become a problem. This is particularly important in residential single-phase systems, due to voltage unbalances created by the inflow of points in the network. The existing literature frequently refers to three-phase systems focusing on losses and voltage variations. Many studies tend to use case studies whose conclusions are difficult to replicate and generalise. As levels of residential PV rise, single-phase PV power injection levels, before voltage unbalances reach standard limits, become important to be investigated. In this study, an urban European reference network is considered, and using a real-time digital simulator, different levels of PV penetration are simulated. PV systems are connected to the same phase (unbalanced case), and are also evenly phase-distributed (balanced case). Considering a 2–3% unbalance limit, approximately 3.5–4.6 kW could be injected in every bus in an unbalanced scenario. With a balanced PV distribution, the power injected could reach 10–13 kW per bus. Buses closer to the power transformer allow higher power connections, due to cable distances and inferior voltage drops. Feeder length, loads considered during simulation, and cable shunt capacitance reactance influence the results the most.

scholarly journals Coordinated single-phase control scheme for voltage unbalance reduction in low voltage network

2017 ◽  
Vol 375 (2100) ◽  
pp. 20160308 ◽  
Author(s):  
Deepak Pullaguram ◽  
Sukumar Mishra ◽  
Nilanjan Senroy
Keyword(s):  
Distribution Systems ◽  
Single Phase ◽  
Reactive Power ◽  
Low Voltage ◽  
Power Sharing ◽  
Voltage Unbalance ◽  
Line Configuration ◽  
Control Scheme ◽  
Multi Agent ◽  
Proper Power

Low voltage (LV) distribution systems are typically unbalanced in nature due to unbalanced loading and unsymmetrical line configuration. This situation is further aggravated by single-phase power injections. A coordinated control scheme is proposed for single-phase sources, to reduce voltage unbalance. A consensus-based coordination is achieved using a multi-agent system, where each agent estimates the averaged global voltage and current magnitudes of individual phases in the LV network. These estimated values are used to modify the reference power of individual single-phase sources, to ensure system-wide balanced voltages and proper power sharing among sources connected to the same phase. Further, the high X / R ratio of the filter, used in the inverter of the single-phase source, enables control of reactive power, to minimize voltage unbalance locally. The proposed scheme is validated by simulating a LV distribution network with multiple single-phase sources subjected to various perturbations. This article is part of the themed issue ‘Energy management: flexibility, risk and optimization’.

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