Neville Watson

Neville Watson
University of Canterbury | UC · Department of Electrical and Computer Engineering

Doctor of Philosophy

About

300
Publications
110,544
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6,153
Citations

Publications

Publications (300)
Article
Full-text available
There is a growing use of High Voltage Direct Current (HVDC) globally due to the many advantages of Direct Current (DC) transmission systems over Alternating Current (AC) transmission, including enabling transmission over long distances, higher transmission capacity and efficiency. Moreover, HVDC systems can be a great enabler in the transition to...
Article
Full-text available
Light emitting diode (LED) lamps are now an established lighting technology, which is becoming prevalent in all load sectors. However, LED lamps are non-linear electrical loads, and their impact on distribution system voltage quality must be evaluated. This paper provides a detailed analysis of time domain and frequency domain approaches for develo...
Article
Full-text available
Solving the Unit Commitment problem is an important step in optimally dispatching the available generation and involves two stages—deciding which generators to commit, and then deciding their power output (economic dispatch). The Unit Commitment problem is a mixed-integer combinational optimization problem that traditional optimization techniques s...
Article
On 4 August 1888, Reefton became the first town in New Zealand to have its own public electricity supply powered by hydrogeneration. In Australia, the first supply of electricity to the public at large was in two small country towns in New South Wales. Tamworth, with a population of 3,000, switched on arc and incandescent street lighting on 9 Novem...
Article
Full-text available
In this paper, a hybrid optimization algorithm is proposed to solve multiobjective optimal power flow problems (MO-OPF) in a power system. The hybrid algorithm, named DA-PSO, combines the frameworks of the dragonfly algorithm (DA) and particle swarm optimization (PSO) to find the optimized solutions for the power system. The hybrid algorithm adopts...
Article
Full-text available
One method to model power electronic devices for harmonic emission studies is using frequency-domain models based on the frequency coupling matrices. This paper presents a new test procedure for the experimental evaluation of the frequency coupling matrix elements of power electronic devices. An automated test system is designed, realized, and char...
Conference Paper
With the increasing uptake of new technologies such as electric vehicles (EVs), photovoltaic (PV) generation, wind, and LED lighting, there is a need to study their effect on the Power Quality (PQ) of the low voltage (LV) distribution network. These new technologies use power electronic converters which result in harmonics being injected into the A...
Article
This paper presents a method to achieve optimal active and reactive power contributions from each energy storage system in an unbalanced distribution network to minimize power loss, while ensuring network current and voltage constraints are satisfied. By modelling loads as either constant current or constant impedance, the AC optimal power-flow is...
Conference Paper
With the increasing uptake of new technologies such as Photovoltaic (PV) generation, wind, electric vehicles (EVs) and LED lighting, there is a need to study their effect on the Power Quality (PQ) of the low voltage (LV) network. These new technologies use power electronic converters which result in harmonics being injected into the AC network. In...
Article
Full-text available
Globally, renewable generation is growing rapidly, and the next few decades are likely to see many consumers adopting new grid-connected technologies such as electric vehicles, photovoltaics and energy management systems. However, these ‘greener’ and smarter’ changes could create significant challenges for power quality, safety and other aspects of...
Article
Wideband harmonics and resonances are challenging the stability and power quality of emerging power-electronic-based power systems and therefore harmonic modeling and analysis of power converters are becoming even more important. However, the complex interactions on both ac and dc sides of a converter, and the propagated interaction to other system...
Article
Full-text available
Transient state estimation (TSE) was used to determine the state values that have no measurement equipment placed in an electric power system with transient phenomena. Previous papers used the PI model for TSE with a short transmission line, but longer lines require the development of algorithms that include the distributed parameters of transmissi...
Conference Paper
Full-text available
Small-scale distributed generation (DG) in New Zealand, particularly photovoltaic (PV) generation, has been growing steadily over the past few years. In the last year alone to 31 March 2016, installed PV generation of all capacities has grown by a factor of about 1.6 to reach 37 MW. Approximately 90% (33 MW) of this installed PV capacity is made up...
Article
Full-text available
Steady-state voltage levels will be a significant problem in the future distribution network due to a high penetration of new technologies, particularly photovoltaics. A smart transformer which incorporates a fixed tap transformer with a power electronic voltage regulator has the potential to mitigate this problem by varying the line voltage automa...
Article
Power quality (PQ) is a major concern in the relatively small island electrical network of New Zealand. The potential influx of new technologies, such as electric vehicles, heat-pumps, light-emitting diode lighting, etc., could potentially cause electromagnetic-compatibility problems in the future. To manage the PQ into the future, a government-fun...
Article
Full-text available
Multilevel current reinjection (MLCR) concept provides self-commutation capability to thyristors, enabling thyristor based current source converters (CSC) to operate under negative firing angle. It also lowers the input current harmonic distortion. This is achieved by using an auxiliary reinjection bridge. Extensive experimental results are present...
Conference Paper
Full-text available
The uptake of electric vehicles in New Zealand is rapidly increasing and there is a desire for information about charging systems. This information is required by consumers, engineers, and businesses interested in installing charging infrastructure. This project was completed during the 2015-2016 summer break and aimed to enhance the University of...
Conference Paper
Full-text available
Desires to reduce reliance on fossil fuels and reduce greenhouse gas emissions, as well a period of technological development and falling technology prices, has led to increased interest in the use of new technologies in the energy sector. This paper, resulting from the GREEN Grid research program, presents initial analysis on the effects of three...
Conference Paper
Full-text available
Small-scale distributed generation (DG) in New Zealand, particularly photovoltaic (PV) generation, has been growing steadily over the past few years. In the last year alone to 31 March 2016, installed PV generation of all capacities has grown by a factor of about 1.6 to reach 37 MW. Approximately 90% (33 MW) of this installed PV capacity is made up...
Article
The increasing number of renewable energy sources in the distribution grid is becoming a major issue for utility companies since grid-connected converters are operating at different operating points due to the probabilistic characteristics of the renewable energy. Usually, the harmonics and impedance from other renewable energy sources are not take...
Article
Full-text available
Smart-meter data presents an opportunity for utilities to improve their database records, and develop an low voltage (LV) model which may be useful for outage management and fault detection, isolation and response, phase balancing and network planning. In addition, impact assessment studies on new technologies can be performed. This paper presents...
Conference Paper
Full-text available
The frequency of the power system experiences variations due to various factors including intermittent renewable and distributed generators, and imbalance between generated and consumed power. This frequency variation may affect the operation of grid connected converters. For example, in case of repetitive control of grid connected converters, the...
Article
Full-text available
Residential rooftop-mounted solar photovoltaic (PV) panels are being installed at an increasing rate, both in New Zealand and globally. There have been concerns over possible issues such as overvoltage and overcurrent. These PV systems are mostly connected at low voltage (LV). This study presents a case study of simulating the entire LV network fro...
Conference Paper
Full-text available
The desire to reduce our reliance on fossil fuel and reduce the emission of greenhouse gases has led to an increasing interest in the use of Electric Vehicles (EVs), whether all electric or plug in hybrid electric vehicles (PHEV). New Zealand is ideally suited for the uptake of EVs since most of the electricity generation is from renewable resource...
Conference Paper
Full-text available
Power quality (PQ) in the low voltage (LV) network and consumer premises, especially homes, is largely unmonitored and, anecdotally, is not well understood. Specific monitoring typically takes place only after consumer complaints have been laid or abnormalities noticed. This paper investigates the possibilities, opportunities, and challenges around...
Conference Paper
Full-text available
This paper presents a preliminary economic study on the feasibility of using electric vehicles (EVs) to provide demand response, carried out as part of the GREEN Grid project. A mathematical model is developed to track the charge cycle of an EV battery, and this in turn provides estimates of the cost associated with battery life degradation under d...
Conference Paper
Full-text available
Electrical Power Quality is the study of how close to the ideal sinusoid the voltage and current waveforms are. In reality the Voltage Quality is of most concern as it is through the terminal voltage that the devices interact. Any deviation, whether momentary or sustained, in the voltage a device sees at its terminal is a power quality (PQ) issue a...
Conference Paper
In order to determine the monitoring in large power system during disturbance, Transient State Estimation (TSE) algorithm combines partial measurement with state estimation technique to derive measurement value at unmonitored location in electric power system with transient phenomena. The measurement noises are taken into considering the efficiency...
Article
Full-text available
Thyristor based multilevel current reinjection (MLCR) current source converter (CSC) provides self-commutation capability to thyristors. It also has high quality line current waveform by accurately shaping the DC bus current using an auxiliary reinjection bridge. However the theoretical and PSCAD/ETDC simulation analysis do not take into account th...
Article
Full-text available
Grid-connected inverters (GCI) are widely used to feed power from renewable energy distributed generators into smarter grids. Repetitive control (RC) enables such inverters to inject high quality fundamental-frequency sinusoidal currents into the grid. However, digital RC which can get approximately zero tracking error of any periodic signal with k...
Article
Full-text available
Reverse cycle air-source heat-pumps are an increasingly significant load in New Zealand and in many other countries. This has raised concern over the impact wide-spread use of heat-pumps may have on the grid. The characteristics of the loads connected to the power system are changing because of heat-pumps. Their performance during under-voltage eve...
Article
The detection of the source and severity of disturbances is important as this allows network companies to respond faster and remediate the problem more quickly. After an event, knowledge of the severity of a disturbance at various busbars gives understanding of what equipment was subjected to and an indication of possible improvements needed to mit...
Article
Full-text available
SUMMARY This paper presents the first experimental validation of a Harmonic State-Space (HSS) model. The HSS framework is capable of capturing the transient evolution of harmonics as well as their steady-state, and the frequency cross-coupling nature of power electronic circuits is fully represented. The HSS requires non-linear power electronic cir...
Article
Full-text available
This paper presents a review with a concise de-scription and analysis of the fundamentals, characteristics, analytical details, merits, and drawbacks associated with existing methods in frequency and time domain for harmonic analysis in practical power networks. The description and analysis are centered on methods developed in the harmonic domain,...
Conference Paper
Full-text available
Grid operators, worldwide, are experiencing higher distributed generation penetration levels. This new paradigm is starting to show its effects and in order to maintain the safety and reliability of the network, most distribution system operators are adopting international standards or defining their own. Besides available international standards,...
Conference Paper
Full-text available
With the increasing uptake of new technologies (such as PV, wind, EVs and LED lighting) there is a need to study their effect on the low voltage (LV) network, and this is one part of the Green Grid project's objectives. Although detailed modelling of an LV network will provide a more accurate assessment of their impact for a given scenario and netw...
Conference Paper
Full-text available
The GREEN Grid project is investigating the impact of solar power generation from photovoltaics (PV) connected to the low and medium voltage distribution networks. One of the goals of this research is to provide guidelines for adoption of PV in New Zealand, and modelling tools and techniques for distribution companies to better understand its impac...
Article
Full-text available
This article presents a comprehensive analysis of the thyristor based seven-level multi-level current reinjection current source converter. The seven-level multi-level current reinjection current source converter increases the pulse number from 12 to 72, thereby producing high-quality AC current and DC voltage waveforms, thus lowering harmonics on...
Chapter
Introduction Synchronous Machine Transformers Summary
Chapter
Quality of power supply is now a major issue worldwide making harmonic analysis an essential element in power system planning and design. Power System Harmonic Analysis presents novel analytical and modelling tools for the assessment of components and systems, and their interactions at harmonic frequencies. The recent proliferation of power electro...
Chapter
Introduction Composite Resonance—A Circuit Approach Transformer Core Related Harmonic Instability in AC–DC Systems Summary
Chapter
Introduction Fixed Point Iteration Techniques The Method of Norton Equivalents ABCD Parameters Model Newton's Method Diagonalizing Transforms Integrated Converter and Load Flow Solution Summary
Chapter
This appendix contains sections titled: Voltage Mismatch Partial Derivatives Direct Current Partial Derivatives End of Commutation Mismatch Partial Derivatives Firing Instant Mismatch Equation Partial Derivatives Average Delay Angle Partial Derivatives Voltage Mismatch Partial Derivatives Direct Current Partial Derivatives End of Commutation Mismat...
Chapter
The PDM Spectrum Firing Angle Modulation Applied to the Ideal Transfer Function
Chapter
The PPM Spectrum Contribution of Commutation Duration to DC Voltage Contribution of Commutation Duration to AC Current Contribution of Commutation Period Variation to AC Current