VOLTAGE STABILITY ENHANCEMENT OF NIGERIA EGBU 11kV DISTRIBUTION NETWORK USING D-STATCOM AND WHALE OPTIMIZATION ALGORITHM

OKEKE, UCHENNA NNAEMEKA (2022) VOLTAGE STABILITY ENHANCEMENT OF NIGERIA EGBU 11kV DISTRIBUTION NETWORK USING D-STATCOM AND WHALE OPTIMIZATION ALGORITHM. Masters thesis, Landmark University, Omu Aran, Kwara State.

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Abstract

Today’s power system network is highly complex and vulnerable to high degree of faults, instability, slow response, malicious acts of terror and natural disasters because of the dominance of new technologies such as controllers, power electronic devices, renewable distributed generation etc in which the operation and control are based on slow conventional soft computing. To continue to enjoy stable energy delivery, power system planners and utilities should begin to shift focus toward intelligence techniques for its upgrade and fast response. Consequently, this study aims at enhancement of voltage stability of Nigeria Egbu 11kV distribution network using D-STATCOM and Whale Optimization Algorithm (WOA). The WOA was used to determine the D-STATCOM optimal placement and sizing. To enhance the voltage stability of the network, the D-STATCOM was deployed as a reactive power compensation device. In order to ascertain WOA's network performance behavior, three test cases were implemented using the minimum voltage stability index of the network, the minimum bus voltage magnitude, and the total active and reactive power loss of the network as performance indices. Test case one was the base case simulation results, test case two was the D-STATCOM manual allocation simulation results and test case three was done using WAO for D-STATCOM optimal placement and sizing. All the three test cases were implemented on two separate networks; the IEEE 33-bus system and Nigeria Egbu 11kV distribution network. The obtained simulation result on IEEE 33 bus system using WOA indicates that the total active power loss was reduced by 35%, the total reactive power loss was reduced by 32%, the minimum voltage profile was improved by 4% and the minimum voltage stability index was enhanced by 14% respectively. The obtained simulation result on Egbu 11kV distribution network using WOA indicates that the total active power loss was reduced by 40%, the minimum voltage profile was improved by 3%, the reactive power loss was reduced by 22%, and the minimum voltage stability index of the network was enhanced by 14% respectively. In conclusion, the study establishes that WOA is an effective algorithm in enhancing the voltage stability of distribution network through optimal placement and sizing of D-STATCOM. In this study, the objectives were achieved without considering the phase load imbalance and harmonics production of D-STATCOM, future work on the impact of phase load imbalance and harmonics production of D-STATCOM when integrated should be considered.

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