DQ SIMULATION SYSTEM DQ Simulation System

Management Information System

Introduction

The Unified Power Flow Controller (UPFC) is the most versatile and complex power electronic equipment that has emerged for the control and optimization of power flow in electrical power transmission system. This paper presents a control system which enables the UPFC to follow the changes in reference values like AC voltage and DC link voltage. Operation of UPFC using a cross coupling control strategy which is based on d-q axis theory is presented by simulation. In this control system, the transformation of a three phase system to the d-q, 2-axis system is done through which real and reactive power can be controlled individually, while also regulating the local bus voltage. The performance of the proposed control system is checked by applying different faults across a transmission line to which UPFC is connected. A generalized pulse width modulation switching technique is used to generate firing pulses for both the converters of the UPFC. Simulations were carried out using PSCAD software to validate the performance of the UPFC connected to a transmission line with different faults. Simulation results show that the proposed control scheme is effective in damping the power swings in transient states. The power transfer capability of long transmission lines is usually limited by thermal capability, dielectric strength and a number of stability issues. Economic factors, such as high cost of long lines and revenue from the delivery of additional power, give strong incentives to explore all economically and technically feasible means of raising the stability limit. On the other hand, the development of effective ways to use transmission systems at their maximum thermal and dielectric capability has caught much research attention in recent years. Fast progression in the field of power electronics has great influence on the power industry. One direct outcome of its influence is the concept of Flexible AC Transmission Systems (FACTS), which improves stability to increase usable power transmission capacity to its thermal limit. The family of FACTS devices makes use of gate turn-off thyristors (GTOs) in high power converter conurations that can be controlled to behave as three phase sinusoidal voltage sources, to provide fast control of active and reactive power through a transmission line. The family of FACTS devices includes the Static Var Compensators (SVCs), Static Synchronous Compensators (STATCOMs), Thyristor Controlled Series Compensators (TCSCs), the Static Synchronous Series Compensators (SSSCs), and the Unified Power Flow Controllers (UPFCs). Overview

 

Software Design

Software design is a method of difficulty explaining and designing for a programs solution. After the reason and specifications of programs are very resolute, programs developers will conceive or provide work designers to evolve a design for a solution. It encompasses low-level constituent and algorithm implementation matters as well as the architectural view.

The software obligations analysis (SRA) step of a software development process yields specifications that are utilised in software engineering. If the programs is "semiautomated" or user centered, programs conceive may engage user know-how design yielding a story board to assist work out those ...