Comparative load flow analysis of a 400/230 KV grid substation in Bangladesh

Abstract

A load flow analysis study is performed to a 440/220kV substation using ETAP and DIgSILENT software. This report shows load flow results, and explains how we can use it to implement changes on the feeders that will ameliorate the voltage profile. The power flow study for this station will be performed on ETAP and DIgSILENT power factory. The acronym ETAP stands for Electrical Transient and Analysis Program. This two software were used as an extensive program for the modelling, simulation, and protection of electrical networks. They not only provide solutions to substation designs, but also specialize in generation, transmission, and distribution of power systems. The software relies on predictive simulation. This allows the user to perform analysis using real-time system parameters and may also simulate abnormal scenarios to predict equipment malfunctioning. It can be used as a preventive simulation, which allows the user to see any automated circuit breakers, relays, alarms and warnings. These alarms and warnings are based on events that could potentially occur and corrective action will be suggested. The results are always verified and analyzed against field results, real system measurements, and hand calculations. The one-line diagram of the electrical system in question is composed of several pieces of equipment, each with a specific function. All of the components for this substation are high-voltage components. Some of the most important components are the Generators, capacitor banks, transmission lines, buses, potential transformers, and current transformers. These will affect the design for the substation and the operation.