scholarly journals Reduction of energy losses achieved by an optimal reactive power generation in photovoltaic systems installed inside a low voltage distribution network

2015 ◽  
pp. 607-611
Author(s):  
Ernest Belič ◽  
Katarina Dežan ◽  
Niko Lukač ◽  
Gorazd Štumberger
Keyword(s):  
Power Generation ◽  
Reactive Power ◽  
Low Voltage ◽  
Distribution Network ◽  
Energy Losses ◽  
Photovoltaic Systems ◽  
Voltage Distribution

Features of Application of the «Open Triangle» Scheme in the Rural Low-Voltage Structure Distribution Network

2020 ◽  
Vol 63 (5) ◽  
pp. 72-78
Author(s):  
Ivan Nadtoka ◽  
◽  
Pyotr Osadchiy ◽  
Vladimir Tropin ◽  
◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Reactive Power ◽  
Low Voltage ◽  
Distribution Network ◽  
Practical Case ◽  
Power Losses ◽  
Voltage Distribution ◽  
Inductive Load ◽  
Active Load ◽  
Open Triangle

The features of applying the «open triangle» scheme in the structure of a rural low-voltage distribution network with a voltage of 220 V are studied from the standpoint of achieving a certain energy efficiency. The energy effect is estimated by the criterion of the relative value of the additional power losses in the conductors of a three-wire line of a 220 V network caused by reactive power and load asymmetry. The load is modeled by two power receivers connected to the phase-to-phase voltage, the general output of the power receivers is grounded, which forms the «open triangle» circuit. The energy characteristics of the active load, active load with capacitive corrective element, active load with capacitive and inductive corrective elements are analyzed; and also the most practical case – active-inductive load with various values of reactive power factors -0,1; 0,2; 0,3 and capacitive corrective element. An important feature of applying the «open triangle» scheme in the structure of a rural low-voltage distribution network with a voltage of 220 V, from the standpoint of achieving practically necessary and sufficient energy efficiency - not exceeding 10 % of the additional power losses, is the ability to compensate for reactive power and balancing the phase currents of the network line using only one corrective capacitor of relatively low power - about 50 % of the active power of one power receiver.

scholarly journals Advanced voltage control method for improving the voltage quality of low-voltage distribution networks with photovoltaic penetrations

2021 ◽  
Vol 4 (S2) ◽  
Author(s):  
Marika Nakamura ◽  
Shinya Yoshizawa ◽  
Hideo Ishii ◽  
Yasuhiro Hayashi
Keyword(s):  
Reactive Power ◽  
Control Method ◽  
Low Voltage ◽  
Distribution Network ◽  
Distribution Networks ◽  
Voltage Distribution ◽  
Power Conditioning ◽  
Pv Systems ◽  
Measurement Period ◽  
Voltage Violation

AbstractAs the number of photovoltaic (PV) power generators connected to the distribution grid increases, applications of on-load tap changers (OLTCs), power conditioning systems, and static reactive power compensators are being considered to mitigate the problem of voltage violation in low voltage distribution systems. The reactive power control by power conditioning systems and static reactive power compensators can mitigate steep voltage fluctuations. However, it creates losses in generation opportunities. On the other hand, OLTCs are installed at the bases of distribution lines and can collectively manage the entire system. However, the conventional voltage control method, i.e., the line drop compensation (LDC) method, is not designed for the case in which a large number of PV systems are installed in the distribution network, which results in voltage violations above the limit of the acceptable range. This study proposes a method to determine the optimal LDC control parameters of the voltage regulator, considering the power factor of PV systems to minimize the magnitude of voltage violations based on the voltage profile analysis of low-voltage (LV) distribution networks. Specifically, during a measurement period of several days, the voltages at some LV consumers and pole transformers were measured, and the optimal parameters were determined by analyzing the collected data. The effectiveness of the proposed method was verified through a numerical simulation study using the actual distribution system model under several scenarios of PV penetration rates. Additionally, the difference in the effectiveness of voltage violation reduction was verified in the case where all the LV consumer’s consumer voltage data measured per minute were used as well as in the case where only the maximum and minimum values of the data within the measurement period were used. The results reveal that the proposed method, which operates within the parameters determined by the voltage analysis of the LV distribution network, is superior to the conventional method. Furthermore, it was found that even if only the maximum and minimum values of the measurement data were used, an effective voltage violation reduction could be expected.

Research on Integrated Parameter Measurement and Control System of Low Voltage Distribution Network

2017 ◽  
Vol 9 (3) ◽  
pp. 32-46
Author(s):  
Weifang Zhai ◽  
Yongli Liu ◽  
Yiran Jiang
Keyword(s):  
Reactive Power ◽  
Low Voltage ◽  
Design Method ◽  
Distribution Network ◽  
Market Potential ◽  
Parameter Measurement ◽  
Voltage Distribution ◽  
And Control ◽  
Reactive Power Compensator ◽  
Measurement And Control

In order to ensure the safe operation of the distribution network and to understand the operation of the distribution network, it is necessary to monitor the various operating parameters of the distribution network in real time and to send the various measurement parameters to the dispatching and monitoring center in time. So the low-voltage distribution network integrated parameter measurement and control has been widely used. This paper introduces a design method of combining two sets of reactive power compensator and distribution network measuring and controlling device into one part. The distribution network measurement and control, power factor correction and reactive power compensation are realized. In a word, the system has simple structure, high precision, and strong anti-interference ability, among other advantages, with great market potential.

scholarly journals Analysis of Voltage Unbalance and Energy Loss in Residential Low Voltage Distribution Systems with Rooftop Photovoltaic Systems

2020 ◽  
Vol 190 ◽  
pp. 00033
Author(s):  
Rattanaprapa Charoenwattana ◽  
Umarin Sangpanich
Keyword(s):  
Energy Loss ◽  
Distribution Systems ◽  
Low Voltage ◽  
Energy Losses ◽  
Photovoltaic Systems ◽  
Housing Estate ◽  
Voltage Distribution ◽  
Pv System ◽  
Voltage Unbalance ◽  
Pv Systems

This paper investigates effects of voltage unbalance and energy losses due to the connection of rooftop photovoltaic systems in a low voltage distribution system of a housing estate, which has light loads during daytime. The paper presents a case study of a real distribution power system of housing estate in Thailand. Voltage unbalance and energy losses were simulated by using system characteristic and load data from GIS database of PEA with the DIgSILENT Power Factory program. The key findings of our analysis are as follows. Firstly, the number of installable 1-phase rooftop PV systems varies directly with load density. Secondly, the number of installed 1-phase rooftop PV systems can be increased if the installation locations are closer to the transformer. For 3-phase rooftop PV systems, their installations do not have any effects on the voltage unbalance. Furthermore, system energy loss relates to the load density and PV system installation locations in the same way as the voltage unbalance. The key implication of our study is that the installation of 1-phase rooftop PV system should be granted based on a careful consideration of the installation location and the load density.

Integration of roof-top solar photovoltaic systems into the low voltage distribution network

2014 ◽  
Vol 6 (3) ◽  
pp. 033135 ◽  
Author(s):  
G. M. Shafiullah ◽  
Amanullah M. T. Oo ◽  
Alex Stojcevski ◽  
A. B. M. Shawkat Ali
Keyword(s):  
Low Voltage ◽  
Distribution Network ◽  
Photovoltaic Systems ◽  
Solar Photovoltaic ◽  
Voltage Distribution

The Design and Application of SVG for Low Voltage Distribution Networks

2013 ◽  
Vol 448-453 ◽  
pp. 2097-2104
Author(s):  
Jun Li ◽  
Lin Zhang ◽  
Mei Juan Liu ◽  
Ge Xin Xing ◽  
Wei Wei Li ◽  
...  
Keyword(s):  
Reactive Power ◽  
Low Voltage ◽  
Distribution Network ◽  
Distribution Networks ◽  
Control Mode ◽  
Parallel Operation ◽  
Voltage Distribution ◽  
Engineering Project ◽  
Voltage Variation ◽  
Urgent Task

SVG can compensate reactive power deficiency, suppress harmonics, improve three-phase imbalance and power quality more flexibly. There are very few small volume SVG products available for low voltage distribution network in the past. The generic SVG products are very expansive, thus not suitable for low voltage distribution network. Therefore, it is an urgent task to design a new generation distribution network SVG product that offers good value for money. This paper studied a SVG digital controller based on TMS320F28335 DSP chip. The fast and powerful computing and parallel operation capability of TMS320F28335 can satisfy the real-time, multifunction and multiple objective coordination control of SVG. Applied the instantaneous reactive power theory and adopted current direct control mode, an enhanced filtering algorithm to filter instantaneous sampling value is proposed. Automatic bi-directional compensation control strategy effectively reduced voltage variation at the user side. Its effectiveness is verified by an engineering project.

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