<?Pub Dtl=""?> Power system load modeling is a mature and generally well researched area which, as many other in electrical power engineering at the present time, going through period of renewed interest both industry academia. This fueled by appearance new non-conventional types loads (power electronic-based, or interfaced electronics) requirements to operate modern electric systems with increased penetration mostly intermittent generation safe secure manner. As response this interest,...

This paper maps the expected and possible adverse consequences for power quality of introducing several smart distribution-grid technologies applications. The material presented in this is result discussions an international CIGRE-CIRED joint working group. following applications are discussed: 1) microgrids; 2) advanced voltage control; 3) feeder reconfiguration; 4) demand-side management. Recommendations given based on mapping.

This paper presents the results of comprehensive testing and subsequent detailed analysis obtained test results, evaluating harmonic interharmonic performances photovoltaic inverters (PVInvs) for a range different operating conditions. The presented indicate significant power-dependent changes in emissions tested PVInvs supply voltage conditions (presence waveform distortions various source impedance values). To correctly quantify describe these PVInv performance, this discusses applies...

The total supply capability (TSC) is an important index for assessing the reliability of a distribution power system. In this paper, two models to evaluate TSC are established. first, acquired with conditions that all load outages can be restored via network reconfiguration transformers' N-1 contingencies, i.e., constraints related branch thermal ratings and bus-voltage limits satisfied following restoration each contingency. second model, which revision considers daily curves different...

The importance of the accurate forecasting power outputsof wind-based generation systems is increasing, as their contributions to total system are rising. However, wind energy resource exhibits strong and stochastic spatio-temporal variations, which further combine with uncertainties in WF operating regimes, i.e., numbers turbines normal operation, under curtailment, or that faulty/disconnected. This paper presents a novel approach for efficient dealing hour-ahead forecasted outputs. It...

This paper discusses the sensitivity of adjustable speed drives (ASDs) to voltage sags and short interruptions on basis extensive test results. Existing standards previously published work are critically reviewed, a description procedures needed for appropriate assessment ASD is presented. The following tests were performed: rectangular three-phase, two-phase, single-phase with ideal nonideal supply characteristics, as well nonrectangular-balanced three-phase similar those caused by starting...

This paper discusses the sensitivity of personal computers (PCs) to voltage sags and short interruptions on basis extensive test results. Existing standards previously published works are reviewed, a description used testing procedure is presented. The following tests were performed: rectangular with ideal nonideal supply characteristics, caused by starting large motors. results obtained emphasize importance clear definition malfunction criteria for this equipment.

This paper applies optimal power flow (OPF) to evaluate and maximize network benefits of demand-side management (DSM). The are quantified in terms the ability demand-responsive loads relieve upstream constraints provide ancillary services, such as operating reserve. study incorporates detailed information on load structure composition, allows potential benefits, which could be obtained through different types, compared. It is demonstrated that actual location demand-manageable has an...

This paper discusses the sensitivity of ac coil contactors to voltage sags, short interruptions, and undervoltage transients on basis extensive test results. Existing standards previously published work are reviewed, a detailed description testing procedure used is presented. The following tests were performed: rectangular sags with ideal nonideal supply voltage, two-stage which occur during starting large motors, as well against measured sag. importance sag characteristics besides magnitude...

This paper presents parameter values and ranges of static load models used in a power system analysis for the representation both individual electrical devices aggregate loads. The discusses correlates their parameters following statistical processing responses around 100 transmission operators utilities world, who participated survey initiated by CIGRE Working Group C4.605, with corresponding information on from existing literature. According to survey, most frequently are voltage...

This paper presents an integrated approach for assessing the impact that distributed energy resources (DERs), including intermittent photovoltaic (PV) generation, might have on reliability performance of power networks. A test distribution system, based a typical urban MV and LV networks in UK, is modelled used to investigate potential benefits local renewable demand-manageable loads coordinated storage. The conventional Monte Carlo method modified include time-variation electricity demand...

The rising concerns over global climate change and depleting fossil fuel reserves are two of the main reasons for ongoing efforts towards electrification transportation sector. While greenhouse gases (GHGs) emissions from other sectors generally falling, road transport have increased past few decades, with both full electric vehicles (FEVs) plug-in hybrid (PHEVs) being recognized as potential alternatives to combat reduce GHG emissions. However, wide-spread integration FEVs PHEVs will...

This paper addresses some general issues related to the difficulties and uncertainties during assessment characterization of micro small-scale wind-based generation in urban areas. proposes four generic wind turbine models, which could be used for analysis selection optimal turbines target applications, as they accurately represent range currently available on market. The this compares results expected annual energy outputs cost-benefit obtained using steady state dynamic models actual...

This paper, which is part one of a two-part series, presents general methodology for the development improved aggregate load models steady state power system analysis. Using UK residential sector as an example, paper shows how component-based low voltage (LV) can be obtained using measurements, statistical and other available data information on structure active/reactive demands. The presented LV are connected to typical medium (MV) network configurations, in order obtain correct at higher...

This study presents an integrated approach for reliability planning and risk estimation in active distribution systems. By incorporating the use of accurate equivalents different medium voltage/low voltage networks load subsectors, a probabilistic methodology is proposed to capture both power quality aspects system planning, which potentially avoids underestimation system's performance at bulk supply points. A ‘time restore supply’ concept, based on security legislation, introduced quantify...

This paper presents results of experimental and analytical evaluation power-dependent harmonic emission three common types modern low-voltage (LV) power-electronic (PE) devices. After a detailed analysis comprehensive test results, based on both existing new waveform distortion indices, the development component-based models PE devices is discussed. demonstrates importance including devices' controls for accurate modelling their characteristics over entire range operating powers. Most...

The number of fully electric cars is expected to increase significantly in the near future many countries. They are commonly known as vehicles (EVs) and use power electronic-based rectifiers for charging their batteries. These circuits may impact quality LV MV distribution grids, particular distortion at frequencies below 2 kHz (harmonics) above up 150 (supraharmonics). While harmonic emission EVs strongly depends on supply voltage distortion, supraharmonics switching frequency its multiples...

Two important but often neglected characteristics of voltage sags and short interruptions are: point on wave sag/interruption initiation ending. A critical review existing approaches is presented an appropriate definition point-on-wave values proposed. An identification in monitoring applications discussed problems related to identification/assessment highlighted. Examples equipment sensitivity these phenomena are analysed. The results identified ranges relationships reviewed, using examples...

Aggregate load models traditionally used for steady state analysis of power systems are based on standard constant impedance/current/power representation static component, with induction motor dynamic component. These traditional cannot accurately represent characteristics non-linear electronic loads, the impact local distributed generation (DG) aggregate demand, or effects demand-manageable loads. Furthermore, assessment contribution loads and inverter-interfaced DG to flow propagation...

This study presents a simple methodology for analysing and optimising combined wind generation storage schemes, using both technical economic performance criteria. The provides detailed analysis of the two options such scheme: pumped hydro (PSH) battery energy systems (BESSs). is carried out recorded data from an actual UK farm (WF), information on electricity market, currently available PSH BESS technologies to estimate compare considered generation–storage schemes over entire lifetime....

This paper presents the results of experimental evaluation electrical characteristics 28 LED lamps from 13 different manufacturers. The tested are with rated powers in range 3 W-25 W and available on EU market for use typical residential lighting applications. Presented confirm significant differences lamps, e.g. terms their current waveform shapes, harmonic emissions operational power factors. makes significantly other light sources (e.g. CFLs), which typically have similar characteristics,...