Economic Impact of Electricity Interruptions: A Case Study Based on Sri Lanka
Dimuthu Punsara Colambage
Issue:
Volume 11, Issue 1, January 2022
Pages:
1-10
Received:
24 December 2021
Accepted:
22 January 2022
Published:
18 March 2022
Abstract: A power system responsible to supply reasonable level of reliable, qualitative electricity supply to its consumers in an acceptable price. Reasonable level is defined as one balancing the need for power supply and the cost involved. This includes increasing adequacy and security of the system. If the frequency and duration of outages can be reduced, the benefit can be given to consumers. Cost of Unserved Energy is considered as a basic parameter of economic evaluation in the process of increasing the power system reliability. Initial research was conducted before two decades ago and now it is needed to conduct a study of up-to-date on the scope. Thus, research to assess the cost of Unserved Energy for Sri Lanka was conducted and the outcome of the research is presented in this research paper. Consumer survey is chosen as the methodology of the research and it is conducted into three separate electricity consumer categories of domestic, industrial and Commercial. Each category is sub-grouped according to different classifications and separate results have shown for momentary planned and unplanned and non-momentary planned and unplanned interruptions. Finally, the results of each category are averaged into two final values one each for each classification considered.
Abstract: A power system responsible to supply reasonable level of reliable, qualitative electricity supply to its consumers in an acceptable price. Reasonable level is defined as one balancing the need for power supply and the cost involved. This includes increasing adequacy and security of the system. If the frequency and duration of outages can be reduced...
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An Improved Dynamic Control and Resonance Damping for Voltage Source Inverters in Microgrids Through a Novel Active Damping Technique
Wei Zhang,
Girmaw Teshager Bitew,
Dehua Zheng,
Solomon Netsanet Alemu,
Dan Wei,
Xun Zhang
Issue:
Volume 11, Issue 1, January 2022
Pages:
11-22
Received:
10 March 2022
Accepted:
29 March 2022
Published:
8 April 2022
Abstract: Microgrids have the potential to provide customers with improved power quality and reliability. However, there are technical challenges related to the operation and control of microgrids and the distributed energy source (DERs) that constitute them. Resonance caused by the low-pass filters connected to the voltage source inverters of the DERs is one of those issues in the operation of microgrids. This paper proposes a novel technique of Active Damping Algorithm (ADA) for resonance damping and improving the dynamic stability of a microgrid composed of multiple converter-interfaced DERs. The paper considers two cases; one is where the resistor and the filter capacitor are connected in parallel, and the other is where they are connected in series. The proposed active damping method is based on output current feedback with automatically calculated and adjusted damping coefficients to suppress resonance. The proposed method was verified through simulation and experimental tests carried out using PSCAD/EMTDS and an operational microgrid in Beijing, China. The results from both the experiment and simulation analysis showed that the devised method was able to achieve the intended target; where the filter resonance is effectively surpassed and the voltage and frequency dynamic responses are quite stable and within the acceptable range during large power changes in the microgrid system.
Abstract: Microgrids have the potential to provide customers with improved power quality and reliability. However, there are technical challenges related to the operation and control of microgrids and the distributed energy source (DERs) that constitute them. Resonance caused by the low-pass filters connected to the voltage source inverters of the DERs is on...
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