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IET renewable power generation
IET
IET renewable power generation

IET

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1752-1416

IET renewable power generation/Journal IET renewable power generationSCI
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    Guest Editorial: Selected papers from the 7th International Conference on Clean Electrical Power (ICCEP 2019)

    2779-2780页
      原文链接:
    • NETL
    • NSTL
    • Inst Engineering Technology-Iet

    Application of dust mitigation strategies to single-axis-tracking photovoltaic modules in the semi-arid areas of South Africa

    Armand A. du PlessisJohannes M. StraussArnold J. Rix
    2781-2790页
    查看更多>>摘要：Field generated data for single-axis-tracker (SAT) photovoltaic (PV) modules, subjected to the semi-arid Northern Cape region of South Africa, is presented. Experimental dust mitigation methods and the effects of dust soiling on PV module performance are explored. In particular, the use of a hydrophobic anti-soiling coating and a unique SAT self-cleaning manoeuvre was investigated. The SAT results are further compared to six coated and uncoated stationary PV modules. For the performance comparisons, maximum PV module power output was determined from current-voltage (I-V) curves extracted from each individual PV module. This work further presents a novel I-V curve fitting algorithm, which improves measured I-V curve data resolution for precise maximum power point extraction. The PV module performance comparisons were executed with a performance ratio metric, which is defined as the irradiance and temperature corrected performance factor of a PV module. Contrary to the initial research hypothesis, the hydrophobic anti-soiling coating was found to promote dust soiling. The SAT self-cleaning manoeuvre further delivered unique insights regarding the effects of dew water on dust soiling and displacement. Finally, also unique to the research presented here, is the formal description of infield observations made regarding dust deposition.
      原文链接:
    • NETL
    • NSTL
    • Inst Engineering Technology-Iet

    Experimental assessment of winding inter-turn short-circuits fault signatures in six-phase AC permanent magnet synchronous motors

    Yasser GritliMichele MengoniClaudio RossiAngelo Tani...
    2791-2800页
    查看更多>>摘要：The interest for multiphase permanent magnet synchronous machines, in modern renewable power generation systems, is increasing rapidly due principally to their high efficiency and fault-tolerant capability. To meet the high-performance requirements, monitoring the stator winding state is a key item. The detectability of a stator winding inter-turn short-circuit (ITSC), for an asymmetrical six-phase surface-mounted permanent magnet synchronous motor, is analysed in this study. The impact of an ITSC on the stator back-emfs, stator currents and voltages is examined by spectral analysis of the corresponding space-vectors, in different α-β planes. In particular, the detectability of a stator ITSC, in closed-loop operating conditions, is investigated using voltage and current signature analysis. The spectral fault signature is identified through 2D finite element analysis, and then confirmed by laboratory experimental tests.
      原文链接:
    • NETL
    • NSTL
    • Inst Engineering Technology-Iet

    Evaluation of wind turbine power outputs with and without uncertainties in input wind speed and wind direction data

    M. ZouD. FangS.Z. DjokicV. Di Giorgio...
    2801-2809页
    查看更多>>摘要：This paper analyses importance of including wind direction (WD) as an additional explanatory variable to the wind speed (WS) for evaluating uncertainty in wind turbine (WT) power output (Pout). Using available measurements of an actual WT, the paper compares a `two-dimensional' (2D) Pout-WS model with a `three-dimensional' (3D) Pout-WS-WD model for two general cases: (a) for the specific input WS and WD values (i.e. WS and WD without uncertainties), and (b) for the forecasted input WS and WD values (i.e. WS and WD with uncertainties). In paper, 2D and 3D Gaussian mixture Copula model and vine Copula framework are combined with 2D and 3D Markov chain models, which are used to forecast input WS and WD data with uncertainties. The obtained results show that inclusion of WD will provide noticeable improvement for models with no uncertainties in input WS and WD data, while in the case of forecasted WS and WD data with uncertainties, WS is a much stronger contributor to the total WT Pout uncertainty than WD.
      原文链接:
    • NETL
    • NSTL
    • Inst Engineering Technology-Iet

    Sensorless variable speed operation of doubly-fed reluctance wind generators

    Milutin JovanovićSul AdemiRichard Binns
    2810-2819页
    查看更多>>摘要：An improved and more robust flux vector orientated control scheme for an emerging doubly-fed reluctance generator without a shaft angular position or velocity sensor has been proposed, computer-simulated, and experimentally verified. Whilst retaining the cost and other advantages of using a fractional power electronics converter rating, this promising medium-speed brushless machine technology has been viewed by research and industrial communities as an appealing economical solution for the compromised reliability and high maintenance requirements associated with the presence of slip rings, brushes, and the failures prone three-stage gearbox of conventional wound rotor doubly-fed induction generators, traditionally deployed for commercial wind turbines. The comprehensive comparative simulation and test results obtained have been shown to agree very well undoubtedly demonstrating the good overall performance of the sensorless controller. A precise speed reference tracking with smooth, intrinsically decoupled real and reactive power responses of the grid-connected winding has been achieved for the typical variable loading profiles and narrow speed ranges (e.g. around $2:1$2:1 or so) of a laboratory emulated wind turbine.
      原文链接:
    • NETL
    • NSTL
    • Inst Engineering Technology-Iet

    Optimising power system frequency stability using virtual inertia from inverter-based renewable energy generation

    Warren J. FarmerArnold J. Rix
    2820-2829页
    查看更多>>摘要：The objective of this study is to optimise the use of virtual inertia given a virtual inertia budget and a network topology. Following a brief investigation into inertia distribution, it was observed that distributed inertia is more effective than centralised inertia for a large and sparse power system network. A subsection of the South African transmission network, the Western Transmission network, is expected to host large-scale inverter-based generation. The total power system inertia is in decline due to the large-scale integration of inverter-based renewable energy generation. In the literature, mitigation methods such as virtual inertia and `noise-cancelling' network topology design has been proposed to improve frequency stability. In this study, the Western Transmission network is modelled as a network of coupled oscillators. A state-space model for the power system network is developed with virtual inertia as a feedback control loop. The H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> -norm is used to design optimal feedback control through virtual inertia allocation/distribution, to increase power system frequency stability. The results show that the optimal distribution significantly improves system frequency stability by decreasing the rate of change of frequency and delaying the time to reach similar frequency nadir values.
      原文链接:
    • NETL
    • NSTL
    • Inst Engineering Technology-Iet

    Asymmetrical grid control with power electronic regulator in distribution level

    Jan KortenbruckTawichai PremgamoneEgon OrtjohannDaniel Holtschulte...
    2830-2839页
    查看更多>>摘要：As the amount of decentralised generation is continuously increasing, the control and maintenance of grid stability become more complex. This is mainly caused by a change of production capacities from the high-voltage area to the distribution network. As most renewable energy sources in the distribution network are nowadays connected to power electronic converters, harmonic distortion as well as asymmetries (electric vehicle chargers, household photovoltaic systems) are increased. To ensure stability, reliability, and efficiency of the energy distribution network, a grid regulator including asymmetrical and harmonic control is introduced. This grid regulator consists of two inverter systems, where one is connected by a series booster transformer in line, while the other is connected in parallel to the line, capable of decoupling network segments from each other. After a successful verification in simulation, the control structure is implemented in a real hardware setup. The results show that the introduced system is able to decouple network elements in case of an unbalanced situation as well as harmonic current and voltage distortion. To simplify inverter hardware a silicon carbide hardware topology is introduced with a reduced number of switches. Lower switching losses result in higher overall system efficiency.
      原文链接:
    • NETL
    • NSTL
    • Inst Engineering Technology-Iet

    Analytical three-dimensional wind flow model for real-time wind farm simulation

    V. KipkeJ. ChhorC. Sourkounis
    2840-2851页
    查看更多>>摘要：Wind energy conversion systems have gained an essential share of the electricity supply and are increasingly competitive with conventional power plants based on fossil fuel. Wind turbines are expected to continue their increase in rated power and size, exceeding 10 MW and more, imposing major challenges concerning not only the operation of future power grids but also mechanical stress on individual wind turbines, their aerodynamic interaction and holistic wind farm control strategies as well as simulation models being able to cover all these aspects. This study deals with requirements of a real-time capable three-dimensional wind flow model for wind farm simulation, covering key issues from wind modelling through wake interactions to prospects of advanced control strategies. Building upon this, a modular framework is proposed and implemented by integrating existing validated analytical models. Simulation results demonstrating the model capabilities are presented, discussed and evaluated concerning future research focus.
      原文链接:
    • NETL
    • NSTL
    • Inst Engineering Technology-Iet

    Symmetrical three-phase seven-level E-type inverter for PV systems: design and operation

    Marco di BenedettoAlessandro LidozziLuca SoleroFabio Crescimbini...
    2852-2863页
    查看更多>>摘要：Solar photovoltaic (PV) is one of the most favourable renewable energy types today, the use of which has grown throughout the world, and much more is expected in the future due to the continuous price drop. It is important to further develop renewable systems to generate green energy, which results in the reduction of air pollution and in enabling a future sustainable society for the next generation of people. Accordingly, new topologies of the multilevel converter have been proposed and investigated for PV applications to achieve high efficiency and high-power density. This study presents the analysis and design of the symmetrical three-phase E-type inverter (S-3Φ7L E-type). The proposed topology is directly derived from the T-type converter and exhibits seven voltage levels at the output offering interesting performance in terms of power semiconductors current and voltage stress. The hardware design process of the converter has been carried out to enhance the efficiency conversion. Finally, theoretical results are carefully verified by testing the converter prototype, featuring a peak efficiency of 99%.
      原文链接:
    • NETL
    • NSTL
    • Inst Engineering Technology-Iet

    Modelling and evaluation of the Baseline Energy Consumption and the Key Performance Indicators in Technical University of Cluj-Napoca buildings within a Demand Response programme: a case study

    Mihaela CrețuLevente CzumbilBogdan BârgăuanAndrei Ceclan...
    2864-2875页
    查看更多>>摘要：Demand response (DR) programmes offer to customers the opportunity to reduce the power peak and the energy consumption in response to a price signal or financial incentive. Typically, the request to reduce peak demands is made for a specific time period on a specific day, which is referred to as a DR event. To predict a reference energy consumption level in case of different buildings or blocks of buildings within the Technical University of Cluj-Napoca, this study proposes an artificial intelligence enhanced energy profiling method and a more intuitive yet simple method for baseline determination, easy to understand, which allows all the interested parties to estimate the energy and economy savings after a DR event. Once the baseline electric load profile is established, the aim of this study is to calculate some predefined key performance indicators. The two baseline detection methods are compared with each other as a measure of DR event effectiveness. The study has been conducted to clearly demonstrate the economic and environmental benefits of controlling the aggregated load curve in blocks of buildings within several effectively applied DR programmes.
      原文链接:
    • NETL
    • NSTL
    • Inst Engineering Technology-Iet