Carl Kriger

• Doctor of Engineering: Electrical Engineering
• Senior Lecturer at Cape Peninsula University of Technology

Optimal power flow (OPF) is one of the most widely studied problems in the field of operations research, as it applies to the optimal and efficient operation of the electric power system. Both the problem formulation and solution techniques have attracted significant research interest over the decades. A wide range of OPF problems have been formula...

Security and reliability of electrical power supply has become indispensable to modern society, and the system operator is challenged to manage the increasingly complex modern power system in a manner that ensures the expected reliability and security of system operation. In this context, Volt/VAR optimization (VVO) plays a key role in the efficien...

Being the primary cause of inter-area oscillations and due to the fact that they limit the generation’s output, Low-Frequency Electromechanical Oscillations (LFEOs) represent a real threat to power system networks. Mitigating their effects is therefore crucial as it may lead to system collapse if not properly damped. As rotor angle instability is t...

It is vital that the synchronous generator rotor angle be kept stable to avoid disastrous consequences such as the loss of synchronism amongst generators within a power system network. Once it is unstable, the time that is taken to remedy this is advised to be 5–10 s for smaller power systems and 15–20 s for larger ones. The instability that is cau...

Reactive power optimization and voltage control is one of the most critical components of power system operation, impacting both the economy and security of system operation. It is also one of the most complex optimization problems, being highly nonlinear, and comprising both continuous and discrete decision variables. This paper presents the probl...

Are you interested in playing a key role in the SMART ELECTRIC POWER SYSTEM for the future? Then the Master of Engineering in Electrical Engineering in Smart Grid qualification, the first and only one of its kind in Africa, is just the right one for you.

Induction motors are extensively used in various industry applications in fans, pumps, wind turbines and generators to name but a few applications. Although the induction motor is very reliable it is almost inevitable that due its extensive use it could quite likely experience degradation leading to faults and ultimately motor failure. There is the...

In this paper, a Smith predictor compensation scheme is developed to mitigate random delays in a networked wastewater control. The focus here is the process of Dissolved Oxygen (DO) concentration as part of the Activated Sludge Process (ASP). The networked wastewater control is a new method of wastewater control in which the controller and the wast...

The economic dispatch problem is solved within the power system control center based on the data received from the load centers. The power system engineer has to adjust the generator settings at regular intervals to match the available power generation with the required load demand. This is not a trivial task as the power system operating in real-t...

The electric power utilities play a vital role in the generation, transmission and distribution of the electrical power to the end users. The power utilities generally face two major issues - firstly, power systems are expected to operate close to the maximum capacity, and secondly, there is a need for accurate monitoring and control of the power s...

This paper examines the effects of networked induced time delays on the dissolved oxygen (DO) concentration in the activated sludge process (ASP) of a networked wastewater treatment plant (WWTP). This is a situation in which the controller and the wastewater plant are separated by wide geographical distance. This is a new type of WWTP control that...

In the past decade, the need for flexibility and reconfigurability in automation has contributed to the rise of the distributed concept in control systems engineering. The IEC 61499 standard is used to define a distributed model for dividing various components of an industrial application in automation process and complicated control of machinery i...

In order to implement an IEC 61850 communication system, there needs to be a complete understanding of the methods, tools and technologies associated with the communication net-work, protocol and messaging underpinning the services. The IEC 61850 standard allows for communication between devices within a substation where a peer-to-peer model for Ge...

In order to implement an IEC 61850 communication system, there needs to be a complete understanding of the methods, tools and technologies associated with the communication network, protocol and messaging underpinning the services. The IEC 61850 standard allows for communication between devices within a substation where a peer-to-peer model for Gen...

In order to develop an effective control strategy for the activated sludge process (ASP) of a wastewater treatment plant, an understanding of the nature of the influent load disturbances to the wastewater treatment plant is necessary. The wastewater treatment processes are dynamic and the interrelationships between variables are very complex. The v...

This paper discusses the development of a neural network model for the prediction of the influent disturbances, which ultimately affect the activated sludge process. Neural networks are particularly suited to problems where there is no clear understanding of the processes and the complex inter-relationship between variables. The historical data use...

Education of postgraduate students raises questions not only for the teaching of problem-solving skills, but mainly for teaching of design skills and providing high-level research. Development of the postgraduate research projects very often requires interdisciplinary knowledge. For example the control-engineering project requires knowledge for the...