Load shedding scheme for radial distribution system

Ong, Beng Tai (2017) Load shedding scheme for radial distribution system. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

In general, the growth of electricity demand and nature interruption of power system network may cause the failure of grid system and lead to power shortage. Several technical issues should be resolved when the power system network integrated with dispersed generation (DG) is disconnects from external grid and form an islanded system. During power system experiences an islanding state, load-generation mismatch and voltage instability may lead to the system collapse. One of the most effective solution to maintain the system stability is load shedding scheme. The aim of this study is to develop an optimal load shedding scheme in order to maintain system stability and minimize amount of loads to shed when the power system network experiences unintentional islanding. In order to handle this optimization issue, a constrain of multi-objective function that consider linear static Voltage Stability Margin (VSM) and amount of load (active and reactive) curtailment was formulated. The Backtracking Search Algorithm (BSA) was proposed in this study as an optimization tool for determining optimum mount of load curtailment based on proposed objective function. Besides that, the load shedding scheme also involved with load priority case. The performance of proposed load shedding scheme was evaluated and conducted based on IEEE 33-bus radial distribution system integrated with four units DG using MATLAB® software. The performance of power mismatch is analyzed based on daily load demand and power generation. After using optimization process based on BSA, the power mismatch of active and reactive load was curtailed from 33-bus system without cutting substantial loads in the system. Moreover, the voltage profile for each buses are improved and complies with IEEE Standard 18-2002. The obtained findings proved that the proposed load shedding scheme based BSA is more effective in obtaining amount of optimal of loads to be shed without disconnects substantial load in islanding condition compared to optimization technique of Genetic Algorithm (GA).

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