The emerging subsynchronous resonance (SSR) caused by the interaction of wind turbine generators (WTGs) with series compensation has aroused great concerns. For this particular issue, paper is aimed to fill gap between theoretical studies and actual observations. By analyzing field data 58 SSR events captured in a practical power system examining observed dynamics previous results, mechanism characteristics are revealed more explicit substantial way. necessary conditions dominant influential...

The converter is an important component in wind turbine power drive-train systems, and usually, it has a higher failure rate. Therefore, detecting the potential faults for prediction of its become indispensable condition-based maintenance operation turbines. This paper presents approach to fault detection using convolutional neural network models which are developed by Supervisory Control Data Acquisition (SCADA) system data. starts with selection indicator variables, then variables data...

The selective and rapid detection of harmful gases, particularly nitrogen dioxide (NO₂), is critical for improving air quality safeguarding human health, necessitating the development advanced sensing materials with...

In order to investigate the differences of space charge distribution XLPE aged at temperatures below and above melting point, thermo-oxidative ageing was conducted on 110 kV cross-linked polyethylene (XLPE) cable insulation 100 °C much elevated temperature 160 respectively. The showed moderate changes micro-structure until moment when Oxidation Induction Time (OIT) dropped zero. It deduced by results Fourier Transform Infrared (FTIR) Spectroscopy, X-Ray Diffraction (XRD), Differential...

Graphics processing unit (GPU) has been applied successfully in many scientific computing realms due to its superior performances on float-pointing calculation and memory bandwidth, great potential power system applications. The N-1 static security analysis (SSA) appears be a candidate application which massive alternating current flow (ACPF) problems need solved. However, when applying existing GPU-accelerated algorithms solve SSA problem, the degree of parallelism is limited because...

This paper describes a digital pulsewidth modulation/pulse-frequency modulation (PWM/PFM) controller with input-voltage feedforward (IVFF) for synchronous buck dc-dc converters. The includes automatic PWM/PFM mode switching and effective operation minimum number of active components without the need current sensing in PFM operation. IVFF improves efficiency dynamic performance over wide range input voltages. Controller parameters, including PWM frequency, pulse period, transition point are...

In wind power generation, one aim of turbine control is to maintain it in a safe operational status while achieving cost-effective operation. The purpose this paper investigate new techniques for fault detection based on supervisory and data acquisition (SCADA) system order avoid unscheduled shutdowns. proposed method starts with analyzing determining the indicators corresponding failure mode. Three main failures including generator failure, converter pitch are studied. First, each three key...

This letter proposes a superior GPU-accelerated algorithm for probabilistic power flow (PPF) based on Monte-Carlo simulation with simple random sampling (MCS-SRS). By means of offloading the tremendous computational burden to GPU, can solve PPF in an extremely fast manner, two orders magnitude faster comparison its CPU-based counterpart. Case studies three large-scale systems show that proposed whole analysis 10000 SRS and ultra-high-dimensional dependent uncertainty sources seconds...

This paper describes a digital pulse-width modulation/pulse-frequency modulation (PWM/PFM) controller with input voltage feed-forward for synchronous buck DC-DC converters. The includes automatic PWM/PFM mode switching and effective operation minimum number of active components without the need current sensing in PFM operation. Input-voltage improves efficiency dynamic performance over wide range voltages. Controller parameters, including PWM frequency, pulse period, transition point are...

This paper describes a current sharing technique for digitally controlled two-phase buck DC-DC converters where pulse width and resistance mismatches are compensated to achieve approximately equal without sensing currents. Effects of various non-idealities on the performance discussed corresponding mitigation techniques presented. An extension with more than two phases is discussed. Experimental results shown synchronous converter 6 V input voltage, 1.3 V, 0-20 A output.

Advancements in energy Internet technology have brought about stricter requirements for reliable supply to multi-energy integrated coupling systems. Diversified storage systems facilitate operation; different configuration schemes and operating strategies directly affect the reliability of system's supply. This manuscript discussed several operational devices microgrid system. By combining FMEA method Monte Carlo simulations, a novel evaluation was proposed which incorporated...

An increasing share of fluctuating and intermittent renewable energy sources can cause over-currents (OCs) in the power system. The heat generated during OCs increases junction temperature semiconductor devices could even lead to thermal runaway if limits are reached. In order keep within limit semiconductor, module structure with heat-absorbing material below chip is investigated through COMSOL Multiphysics simulations. upper for Silicon (Si) Carbide (SiC) assumed be 175 250 ∘C,...

Given the problems of low accuracy and complex process steps currently faced by field fault diagnosis, a diagnosis method based on multi-sensor data weighted fusion (MSDWF) combined with depth-wise separable convolutions (DWSC) is proposed. The takes into account temporal spatial information contained in can realize end-to-end bearing diagnosis. MSDWF committed to comprehensively characterizing state bearings, operation establish interactive tap inline relationship data; DWSC equipped...

Accurate control of engine speed can effectively improve fuel economy and comfort. Currently, the commonly used PID parameter setting methods for include Ziegler-Nichols method gradient method, etc. Although they have good performance in setting, still shortcomings such as slow response to process long stability time. In this paper, tuna swarm optimization is adjust parameters, optimized results are compared with traditional results. The experimental show that under same test conditions, be...

Lyapunov direct method is utilized in this paper to reveal the transient voltage oscillation stability mechanism for VSC-HVDC systems. Firstly, a reduced analytical nonlinear model assessment proposed, which Liénard system. Based on proposed model, novel function constructed and conservative boundary depicted, reveals that can be well damped when operating points are within domain of asymptotic stability. In addition, it found there exists one limit cycle Once any system operation point...

Abstract For recovering Ni, Co, and Mn from lithium‐ion batteries, traditional chemical precipitation methods demonstrate low selectivity significantly contribute to environmental pollution. This study proposes a separation recovery technique for transition metals, specifically Mn, spent LIBs, involving “acid dissolution” “multistage oxidation precipitation”. More than 98 % of metals can be extracted LIBs using acid concentration (0.5 M) without reducing agents. The feasibility separating...

The micro-grid is an approach to solve distributed generations interconnecting with power grid. Wind-PV-ES hybrid system could make full use of clean energy and have high reliability. Smooth switching between grid-connected islanding mode important stable operation. This paper proposes improved control strategy combining master-slave peer-to-peer in order transition smoother. A model based on wind-PV-ES built DigSILENT/PowerFactory, the realized it. result shows that this can ensure balance,...

Abstract Converter interfaced generation (CIG) may switch into different control modes under fault scenarios, which poses a significant challenge to the calculation of modern power systems. This paper first establishes reduced analysis model CIG considering mode switching. By neglecting fast dynamic processes converter controller, with each can be expressed by equality and inequality constraints. Then, an alternative iteration algorithm is proposed determine grid‐tied after fault, mainly...