Harmonic Modelling and Interaction in Synchronous Machines and Static Converters
Document information
| Author | J. F. Eggleston |
| School | University of Canterbury |
| Major | Electrical Engineering |
| Year of publication | 1985 |
| Place | Christchurch |
| Document type | thesis |
| Language | English |
| Number of pages | 288 |
| Format | |
| Size | 7.87 MB |
- Synchronous Machines
- Power System Harmonics
- Harmonic Modelling
Summary
I. Introduction
The document presents a comprehensive exploration of harmonic modelling and its implications in synchronous machines and static converters. It establishes the foundational concepts of power system harmonics, emphasizing their significance in electrical engineering. The introduction outlines the necessity for accurate modelling techniques to address the challenges posed by harmonics in power systems. The author highlights the increasing complexity of electrical systems and the need for advanced modelling approaches to ensure stability and efficiency. The introduction serves as a precursor to the detailed discussions that follow, setting the stage for an in-depth analysis of harmonic interactions and their practical applications.
II. Overview of Power System Harmonics
This section delves into the nature of harmonics within power systems, categorizing them into various types and discussing their sources. The author provides a detailed examination of steady-state modelling techniques, which are crucial for understanding harmonic behaviour. The document emphasizes the importance of identifying harmonic penetration and its impact on system performance. Notably, the section discusses early models and their limitations, paving the way for more sophisticated approaches. The iterative algorithm introduced here is a significant advancement, allowing for dynamic simulations that enhance the understanding of harmonic interactions. The author states, 'Accurate modelling of harmonics is essential for the reliable operation of modern power systems.'
2.1 Steady State Modelling
Steady-state modelling is crucial for predicting the behaviour of electrical systems under normal operating conditions. This subsection discusses various methodologies employed in steady-state analysis, highlighting their strengths and weaknesses. The author notes that traditional models often fall short in capturing the complexities of harmonic interactions, necessitating the development of more robust techniques.
2.2 Harmonic Penetration
Harmonic penetration refers to the extent to which harmonics affect the overall system. This subsection explores the factors influencing harmonic penetration, including system configuration and load characteristics. The author emphasizes the need for continuous monitoring and analysis to mitigate adverse effects on system performance.
III. Harmonic Modelling of Converter Operation
The focus shifts to the harmonic modelling of converter operations, where the author outlines the iterative algorithm's role in enhancing modelling accuracy. This section discusses the various components involved in converter operation, including the calculation of commutation currents and the sampling of AC and DC waveforms. The author highlights the transition from time-domain to frequency-domain analysis, which is pivotal for understanding harmonic behaviour in converters. The iterative algorithm is presented as a powerful tool for solving complex equations that govern converter dynamics. The author asserts, 'The iterative approach allows for a more nuanced understanding of harmonic interactions, leading to improved system design.'
3.1 Introduction to Converter Modelling
This subsection introduces the fundamental principles of converter modelling, emphasizing the importance of accurate representation of electrical components. The author discusses the challenges faced in modelling converters and the necessity for innovative approaches to overcome these hurdles.
3.2 Solving the Operation of the Converter
The operation of converters is complex, involving multiple variables and interactions. This subsection details the methodologies used to solve converter operations, including the calculation of commutation currents and the implementation of control strategies. The author highlights the significance of these calculations in ensuring stable converter performance.
IV. Harmonic Interaction Between A
This section addresses the intricate interactions between AC, DC, and converter systems, focusing on the effects of these interactions on harmonic currents. The author discusses harmonic instability and its implications for system reliability. The analysis includes case studies, such as the six-pulse converter at Tiwai, illustrating the practical challenges faced in real-world applications. The author notes, 'Understanding harmonic interactions is vital for the design of resilient power systems.' The section concludes with recommendations for future research and improvements in modelling techniques.
4.1 Effects of Interactions
The interactions between different system components can lead to significant harmonic currents. This subsection explores the mechanisms behind these interactions, providing insights into their impact on overall system performance.
4.2 Case Studies
Case studies serve as practical examples of the theoretical concepts discussed. This subsection presents detailed analyses of specific systems, highlighting the real-world implications of harmonic interactions and the effectiveness of various modelling approaches.
Document reference
- Harmonic Modelling of Convertors (J. F. Eggleston)
- Harmonic Interaction Between A.C., D.C. and Convertor Systems (J. F. Eggleston)
- Harmonic Modelling of Single Phase Feeder and Convertor Systems (J. F. Eggleston)
- Harmonic Norton Equivalent of the Synchronous Machine for Analysis in the Harmonic Space (J. F. Eggleston)
- Application of the Harmonic Norton Equivalent of the Synchronous Machine (J. F. Eggleston)