Voltage Stability Enhancement for Electric Distribution Networks
Mohamed Maher Salah eldeen Abdel-Basset;
Abstract
This thesis proposed an integrated method to deal with the voltage instability problem in radial distribution networks (RDNs). This problem arises due to the ever-increasing load demand which pushing the power systems to their stability boundaries and increases the risk of widespread of partial blackouts. The central core of this strategy is based initially on finding a method to define voltage stability boundaries and index, then the requirements of this analysis are determined. Accordingly, the appropriate solution for voltage instability can be finally found.
The proposed method implies the following main tasks ; load flow analysis for computing the bus voltage and power flow required for computing voltage stability index (SI), voltage stability analysis to evaluate the SI for each bus (node) of the system, voltage stability enhancement to mitigate voltage stability problem by applying the proposed solutions and finally economic study is implemented to choose the best solution.
The developed load flow method which based on the Forward/Backward (F/B) sweep process which is based on the ladder system theory will be capable of handling the unique properties of RDN with any number of buses and different loads to find the voltage at each bus, power flow on each branch and the total system power losses more accurately among with less time of calculation.
The SI is taken from the bi-quadratic equation which is commonly used for the voltage stability calculation of distribution load flow algorithms. A developed formula for computing the SI of all nodes of any distribution network is proposed in this thesis work. Accordingly, the weakly node having the minimum value of SI is the most sensitive node to voltage instability which may result in a voltage collapse.
Installation of DGs in non-optimal places, sizes and without selecting power factors may result in an increase in system losses; voltage problems cause more voltage instability. Optimal DG’s location and size affect the voltage stability improvement resulting an increase in system power loss and others for minimizing the
The proposed method implies the following main tasks ; load flow analysis for computing the bus voltage and power flow required for computing voltage stability index (SI), voltage stability analysis to evaluate the SI for each bus (node) of the system, voltage stability enhancement to mitigate voltage stability problem by applying the proposed solutions and finally economic study is implemented to choose the best solution.
The developed load flow method which based on the Forward/Backward (F/B) sweep process which is based on the ladder system theory will be capable of handling the unique properties of RDN with any number of buses and different loads to find the voltage at each bus, power flow on each branch and the total system power losses more accurately among with less time of calculation.
The SI is taken from the bi-quadratic equation which is commonly used for the voltage stability calculation of distribution load flow algorithms. A developed formula for computing the SI of all nodes of any distribution network is proposed in this thesis work. Accordingly, the weakly node having the minimum value of SI is the most sensitive node to voltage instability which may result in a voltage collapse.
Installation of DGs in non-optimal places, sizes and without selecting power factors may result in an increase in system losses; voltage problems cause more voltage instability. Optimal DG’s location and size affect the voltage stability improvement resulting an increase in system power loss and others for minimizing the
Other data
| Title | Voltage Stability Enhancement for Electric Distribution Networks | Other Titles | تحسين استقرار الجهد لشبكات التوزيع الكهربية | Authors | Mohamed Maher Salah eldeen Abdel-Basset | Issue Date | 2017 |
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