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The paper discusses the impact of microgeneration on the energy quality in a low-voltage (LV) network. Expressions are formulated for obtaining voltage deviations and fluctuations caused by microgeneration sources. Simulations are carried out to predict the impact of microgeneration on voltage drops in nodes of low-voltage lines.
Renewable Energy Resources (RER), especially wind and solar energy resources, have been growing steadily, and supplying all electric power needs from renewable resources appears more achievable than ever. Solar energy has had the greatest growth rate among renewable energy resources in recent years. The main challenge of employing Photovoltaic (PV) systems is the intermittent nature of solar energy...
This paper describes the impact of the operation of distributed energy sources on voltage quality parameters in medium voltage distribution grids. The survey is based on the evaluation of voltage quality measurements which were made in different medium voltage distribution grids with connected wind power plants. These measurements were made in 2014 and were evaluated according to the EN 50160 standard...
There is a large and varied range of wave energy technologies presently under development, in varying stages of progress from model scale to pre-commercial prototypes. Similarly to offshore wind farms, it is anticipated that when these wave energy converters (WECs) ultimately reach commercial stage, they will be implemented in a farm layout, in order to improve economic feasibility and power quality...
Voltage dips constitute to a noticeable part of power quality (PQ) problems but causing major financial losses to industrial and commercial customers. This work involves comparative studies to choose the most appropriate location of monitoring dips for regulation. In this paper, a Dutch MV network is used and dip monitoring locations are considered at different points of connections (POC) where customers...
Distribution Service Operators (DSO's) have historically ensured voltage quality with a range of strategies. However, DSO's now face tough challenges addressing voltage quality due to a number of emerging drivers. Integration of renewable energy into the distribution grid, increased sensitivity of customers to voltage quality and ongoing regulatory developments are increasing the workload of DSO's...
The purpose of this paper is to investigate Distributed Generation (DG) standards and interconnection issues at higher penetration levels. A clear concise definition of “Smart Grid” is presented to illustrate the importance of distributed generation along with the other important aspects of the Smart Grid vision. Specific standards are reviewed with particular focus on frequency and voltage. Major...
A common matter of concern in industrial installations is that adjustable-speed drives (ASD) trip due to voltage sags. ASD manufacturers are including more and more in these devices settings related to control strategies (e.g. allowable DC voltage levels, etc) in order to improve their Low Voltage Ride Through (LVRT). These settings must be carefully adjusted in each installation in order to prevent...
Evaluation procedure for interconnection of distributed generation (DG) to distribution feeder is presented. Regulatory documents are used as guidelines for the approach. Three categories of interconnections are identified. Detailed interconnection studies are proposed to further investigation of prospective interconnections. Additional considerations for allocation and sizing of DG are discussed...
Reactive powers and currents supplied by wind generators are studied in this paper to verify new Spanish grid code requirements. Two approaches are used for that study. One approach is based on the well known Emanuel's theory included in the IEEE Standard 1459-2000. Reactive powers and currents are expressed by Emanuel for the fundamental-frequency, positive-sequence voltages and currents. Second...
The target of this paper is twofold: primarily to highlight the significant effect of certain power supply quality problems on the normal operation of the entire ship grid, namely inrush currents and voltage dips due to manoeuvring thruster motor starting-ups. At a second stage, the paper aims at recommending some amelioration of standardization status. Hence, the authors suggest the exploitation...
Connection of wind farms to the electric network is submitted to some grid codes, which establish wind farm working conditions in presence of some transient phenomena, such as voltage dips. In this paper, Spanish grid code is used to evaluate effects of voltage dips on wind farms working. Reactive powers and currents must be watched at wind generators submitted to voltage dips, thus reactive phenomena...
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