Dynamic reconfiguration of distribution networks to enhance network reliability using optimization techniques
Katwal, Hemanta (2026)
Kandidaatintyö
2026
School of Energy Systems, Sähkötekniikka
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe20260621100694
https://urn.fi/URN:NBN:fi-fe20260621100694
Tiivistelmä
The reliability of electrical distribution networks plays a vital role in ensuring a continuous and stable power supply to the customers. This thesis mainly focuses on improving the reliability of distribution networks through network reconfiguration by using optimization techniques. As a test model, the IEEE 33-bus distribution system is used, and implemented in MATLAB for analysis.
Initially, the voltage profiles and power losses are evaluated when the system is performing in normal conditions. The result is evaluated as the minimum voltage is 0.90 pu, and the total active power losses are 208.95 kW. A fault is then created in Branch 7 for analysis under fault conditions, which shows the interruption in a total of 11 buses.
So, for restoring the power supply in the system, network reconfiguration is performed by using effective available tie switches. After applying tie switches, the results illustrate that all the interrupted buses are successfully restored by reducing the affected buses from 11 to 0. At the same time, the outage duration is also decreased from 1 hour to 0.25 hours. The reliability indices, such as SAIFI, SAIDI, and CAIDI, are calculated using formulas, and an improvement in the system after reconfiguration can be observed.
However, some limitations in voltage performance are seen, such as the minimum voltage was approximately 0.8903 pu after reconfiguration, but this is much lower than standard limits. This enlightens the necessity of additional voltage in practical applications. Overall, network reconfiguration concludes the effectiveness of enhancing reliability in the distribution network by reducing outage impacts and improving the restoration service and also shows the importance of maintaining valuable voltage limits.
Initially, the voltage profiles and power losses are evaluated when the system is performing in normal conditions. The result is evaluated as the minimum voltage is 0.90 pu, and the total active power losses are 208.95 kW. A fault is then created in Branch 7 for analysis under fault conditions, which shows the interruption in a total of 11 buses.
So, for restoring the power supply in the system, network reconfiguration is performed by using effective available tie switches. After applying tie switches, the results illustrate that all the interrupted buses are successfully restored by reducing the affected buses from 11 to 0. At the same time, the outage duration is also decreased from 1 hour to 0.25 hours. The reliability indices, such as SAIFI, SAIDI, and CAIDI, are calculated using formulas, and an improvement in the system after reconfiguration can be observed.
However, some limitations in voltage performance are seen, such as the minimum voltage was approximately 0.8903 pu after reconfiguration, but this is much lower than standard limits. This enlightens the necessity of additional voltage in practical applications. Overall, network reconfiguration concludes the effectiveness of enhancing reliability in the distribution network by reducing outage impacts and improving the restoration service and also shows the importance of maintaining valuable voltage limits.