Temporal variability in renewable energy presents a major challenge for electrical grid systems. Tides are considered predictable due to their regular periodicity; however, the persistence and quality of tidal-stream generated electricity is unknown. This paper first study that attempts address this knowledge gap through direct measurements rotor-shaft power shore-side voltage from 1 MW, rated at grid-connection, tidal turbine (Orkney Islands, UK). Tidal asymmetry turbulence parameters, flow...

This paper proposes a novel power flow formulation and solution algorithm for generalized large-scale interconnected transmission system encompassing multi-frequency HVac HVdc grids having arbitrary numbers of buses, topologies, operating frequencies. Back-to-back ac/dc voltage-source converters are employed to interconnect control the voltage interchange between two at different The Flow is based on steady-state model back-to-back operated in centralized distributed droop strategies. Each...

This work deals with the steady-state operation of wind energy conversion systems (WECSs) used simultaneously as active filters (AFs) and power generators. application is motivated by increasing number non-linear loads (NLLs) on grid possibility to offer an economical alternative installation dedicated that sink harmonic currents injected such loads. The main contributions this paper are follows: (i) three different control allow simultaneous use WECS AF generator presented; (ii)...

Active filters (AFs) compensate harmonic currents demanded by non linear or time variants loads, with the aim to draw sinusoidal from source. Different control strategies for AF have been proposed: among them, p-q theory is most popular. However, strategy presents some drawbacks. As already reported in literature, unexpected frequencies are generated source current as a consequence of such strategy. The this paper provide, means space vector approach theory, analytical expressions that allow...

Voltage sags and swells are power quality events commonly observed in systems; however, none of the existing methods allows determining their point-on-wave inception recovery instants (and consequently, duration) accurately all cases.The primary goal this paper is to determine these with little or no delay, by calculating absolute rms voltage difference between two adjacent sliding windows.The proposed method based on assumption that maximum when sample under analysis corresponds either...

The growing adoption of decentralised renewable energy generation (such as solar photovoltaic panels and wind turbines) low-carbon technologies will increase the strain experienced by distribution networks in near future. In such a scenario, storage is becoming key alternative to traditional expensive reinforcements network infrastructure, due its flexibility, decreasing costs fast deployment capabilities. this work, an end-to-end data-driven solution optimally design control battery unit...

The voluminous amount of raw waveform data recorded by triggerless power quality monitors contain conspicuous and inconspicuous disturbance events. Data reduction detection techniques are needed to efficiently extract useful information hidden in the identify disturbances. overall objective this study is use step changes rms voltage profile as an alternative triggering feature for automatically detecting switching full characterization event based on processing a small portion selected...

Power quality disturbances (PQDs) consist in deviation of voltage and current waveforms from the ideal sinusoid at fundamental frequency, need to be monitored ensure a reliabile electrical supply. While, traditionally, power monitoring has been performed using signal processing techniques, coupled with shallow Machine Learning classifiers or wave change detection methods, more recently, new approaches, based on Deep Learning, have proposed. These methods potential achieve high classification...

Due to the interaction converter control, pre-existing distortion and grid impedance, harmonic levels caused by renewable energy sources are continuously changing, their assessment requires use of dedicated computer models. Several time-domain models have been proposed carry out this analysis, however, they fall short at least one requirement: either do not provide accurate results, or require an excessively long simulation time. This paper presents a novel model address gap described above:...

This paper proposes a control algorithm for singlephase battery inverters to provide voltage unbalance compensation in distribution networks with high penetration of photovoltaic panels and electric vehicles.A typical system is studied quantify the impact single-phase loads generating units on levels, identify conditions that lead highest unbalance.Voltage then performed by regulating active reactive power exchange between three energy storage grid.The proposed strategy consists an upper...

Z-source inverters (ZSIs) are single-stage power converters with both voltage buck and boost capabilities provided by the unique impedance network ability to operate during shoot-through states. This study proposes a novel non-linear adaptive backstepping method for dc-side controllers in multi-loop control scheme of ZSI grid-tied photovoltaic (PV) systems. Despite variability capacitor inductor values network, proposed controller guarantees robust stable operation under varying levels PV...

Voltage sags and swells occur often in power systems; however, determining the duration of these events is not straightforward. Seven methods for estimating inception recovery points (and consequently, duration) voltage are surveyed: threshold rms voltage, waveform envelope, discrete wavelet transform, missing dq transformation, numerical matrix, peak detector. Each method has its own strengths weaknesses; no one works on all conditions. An algorithmic approach to suggested. Such employs...

This paper proposes a control algorithm for single-phase battery inverters to provide voltage unbalance compensation in distribution networks with high penetration of photovoltaic panels and electric vehicles. A typical system is studied quantify the impact loads generating units on levels, identify conditions that lead highest unbalance. Voltage then performed by regulating active reactive power exchange between three energy storage grid. The proposed strategy consists an upper level...

This paper details the transient operation of a wind energy conversion system (WECS) used simultaneously as an active filter and power generator. study is intended to address response two types phenomena: voltage dips (fast transients) speed variations (slow transients). The governed by electrical dynamics control method results in evaluation WECS low-voltage ride through capability. requires complete mechanical model be included. Simulation are presented for typical WECS, discussion carried...

This paper reports on an improved diode approximation-based model for PVs which is tested three different organic PV (OPV) modules: AgGrid, AgNW and Carbon OPV. The can emulate the electrical characteristics of cells accurately, facilitating deployment in system models. Analytical I-V P-V curves obtained with are compared outdoor test data demonstrate high correlation.

The number of distributed resources for renewable energy installed worldwide has been increasing rapidly in the last decade, and great majority these installations consist solar panels wind turbines. Other sources are not exploited to same level: instance, tidal is still a minute portion global capacity, spite large amount potential stored waves, successful experience few existing plants. world’s second largest range occurs UK but at moment this country limited prototypes. More recently,...

This paper presents a novel computational model approximation-based for organic photovoltaic (OPV) modules made using three different electrode technologies. The is able to reproduce the electrical characteristics of cells accurately, thus facilitating assessment impact these devices in power grid applications. Outdoor measurement data and analytical I-V P-V curves obtained with are compared outdoor test data, together key parameters. experimental simulation results match very closely,...

Due to the high number of photovoltaic (PV) inverters installed, in some regions UK power generated under peak conditions exceeds transmission system capacity limits. With aim mitigate this condition and operate grid within its design limits, utilities curtail PV output power, thus causing financial loss for owners limiting use installed components. The control proposed paper allows using inverter as an Active Filter (AF), when is curtailed, improving quality exploiting MVA. A novel...

Electric vehicle (EV) charging stations fed by photovoltaic (PV) panels allow integration of various low-carbon technologies, and are gaining increasing attention as a mean to locally manage power generation demand. This paper presents novel control schemes improve coordination an islanded PV-fed DC bus EV system during disturbances, including rapid changes irradiance, connection disconnection, or energy storage unit (ESU) discharging. A new hybrid scheme combining the advantages both...

The problem of identifying the sources injecting periodic disturbances in electric systems is a critical point assessment Power Quality. available methods, based on deterministic approach, do not always provide correct results under different possible operating conditions. This paper proposes an innovative method, Fuzzy inference and shows significant simulation results.

Voltage rise is one of the major concerns that limits photovoltaic (PV) hosting capacity or maximum amount PV generation a distribution circuit can accommodate. This paper examines effectiveness low-voltage static compensators (LV-DSTATCOMs) in increasing circuits by mitigating voltage rise. Stochastic analysis framework used to determine while an iterative placement technique identify effective device locations. To provide insights on optimal size, number, and control settings, sensitivity...

This study explains how a Steinmetz compensator works. Past explanations are based on phasor diagrams and do not address the basic physical phenomena of electromagnetic energy flow. paper uses Poynting vector to detect understand process compensation restoration symmetry in an unbalanced system.

This paper describes a novel control method for WECS (Wind Energy Conversion System) meant to partially operate as an AF (Active Filter). The is defined in equivalent reference frame obtained by applying the Park Transformation three-phase quantities. zero-sequence component includd system; this feature enables compensation of harmonics. effectiveness proposed methodology quantified terms current spectra and reduction voltage THD at Point Common Coupling (PCC). application results higher...