Eskom-ZESA interconnected power system modelling (original) (raw)

Master of Science in Electric Power Engineering Analysis of IEEE Power System Stabilizer Models

In 2005 IEEE (The Institute of Electrical and Electronic Engineers) introduced a new standard model for Power System Stabilizers, the PSS4B. This is an advanced multi-band stabilizer that may give a better performance than the regular PSSs often used today. The new stabilizer has three parallel control blocks, each aiming at damping different oscillatory modes or different frequency bands of the low frequency oscillations in the power system. So far the PSS4B is not very known in the market, but in the future it will probably become a standard requirement for key power plants in the power system. This master thesis is a continuation of a project performed in the autumn 2010, where the power system model and the framework for analysis were established. The power system will during this master thesis be upgraded to contain an additional smaller generator and also two different multiple-input stabilizer models, the PSS2B and the PSS4B. These stabilizer models will be implemented and tuned for the small hydro generator in the network. Comparisons between the different network configurations will be performed where the focus will be at the inter-area and local oscillation modes. This master thesis will seek to find an answer on following questions:

The Analysis of the Real-Time Frequency Control in the Interconnected Power Systems

IFAC Proceedings Volumes, 1995

In this paper an approach for the real-time frequency control in the interconnected power systems is presented. The problem of the real-time control increased in a last years due to the new formed interconnections, caused by the political events in the former SFR Yugoslavia. For the analyze a mathematical model adopted for computer simulation and suitable software support is created. The model and the computer simulation are applied and tested on the existing inte~connection. and the results are presented for real happened events.

WAMS – based Control of Phase Angle Regulator Installed in Tie-lines of Interconnected Power System

2012

This paper addresses the state-variable stabilising control of the power system using such series FACTS devices as TCPAR installed in the tie-line connecting control areas in an interconnected power system. This stabilising control is activated in the transient state and is supplementary with respect to the main steady-state control designed for power fl ow regulation. Stabilising control laws, proposed in this paper, have been derived for a linear multi-machine system model using the direct Lyapunov method with the aim of maximising the rate of energy dissipation during power swings and therefore maximising their damping. The proposed control strategy is executed by a multi-loop controller with frequency deviations in all control areas used as the input signals. Validity of the proposed state-variable control has been confi rmed by modal analysis and by computer simulation for a multi-machine test system.

Impact of the Interaction Among Power System Controls Status Report of CIGRE TF 38 . 02 . 16

CIGRE Task Force TF 38.02.16 on “Impact of the Interaction Among Power System Controls” was convened in 1997 to investigate the current status and promote the further development of the coordinated design of multiple controls in large power systems. Properly coordinated designs can mitigate possible adverse interactions among controls. Electromechanical and voltage problems will be studied, though the latter at a lesser extent. The task force report should be completed by mid or late 1999. Emphasis is on continuous, decentralized control, reflecting the industry practice and incorporating robustness issues to cater for multiple system scenarios. In order to provide guidelines, the taskforce will also study the interaction among continuous controls, discrete controls and protection.

Automatic Generation Control Application for Transmission and Generation Centres

Journal of Energy - Energija

Recently, a new Emergency Control Centre for Albanian Transmission System Operator (TSO), which includes Supervisory control and data acquisition (SCADA) and Automatic Generation Control (AGC) applications, has been commissioned. Nowadays, an AGC application is being prepared for the biggest generation company in Croatia, as part of control centre for hydropower plants within western part of Croatia. Both of these implementations use the same AGC application, which is presented in this paper. Although AGC for TSO and AGC for Generation Centre (GC) have many similarities, their main goals are different. AGC for TSO must mainly regulate system’s frequency and area’s active power interchange to their desired values, using only power plants engaged in load-frequency control (LFC). However, AGC for GC must ensure that power production of each power unit not engaged in LFC tracks its planned value, while also ensuring that centre’s share in LFC is being respected. Albeit the AGC is standa...

The Traditional Power Generation and Transmission System: Some Fundamentals to Overcome Challenges

Smart Grids, 2013

In present power system, the engineers face variety of challenges in planning, construction and operation. In some of the problems, the engineers need to use managerial talents. In system design or upgrading the entire system into automatic control instead of slow response of human operator, the engineers need to exercise more technical knowledge and experience. It is principally the engineer's ability to achieve the success in all respect and provide the reliable and uninterrupted service to the customers. This chapter covers some important areas of the traditional power system that helps engineers to overcome the challenges. It emphasizes the characteristics of the various components of a power system such as generation, transmission, distribution, protection and SCADA system. During normal operating conditions and disturbances, the acquired knowledge will provide the engineers the ability to analyse the performance of the complex system and execute future improvement.