In power fingerprint identification, feature information is insufficient when using a single to identify equipment, and small load data of specific customers, difficult meet the refined equipment classification needs. A identification based on improved voltage-current(V-I) trajectory with color encoding transferred CBAM-ResNet34 proposed. First, current, instantaneous power, momentum are added original V-I image coding obtain image. Then, ResNet34 model was pre-trained ImageNet dataset new...

The huge amount of power fingerprint data often has the problem unbalanced categories and is difficult to upload by limited transmission rate for IoT communications. An optimized LightGBM extraction identification method based on entropy features proposed. First, voltage current signals were extracted basis time-domain V-I trajectory features, a 56-dimensional original feature set containing six was constructed. Then, Boruta algorithm with light gradient boosting machine (LightGBM) as base...

This paper presents a 3D seismic-based case study from the deep-water Niger Delta Basin to investigate sedimentary–tectonic interaction on growth sequence architecture within thrust-related intraslope or piggyback basins. Gravitational contraction in lower continental slope had yielded series of thrust faults and associated folds area, which formed several These basins were filled by suite sequences with varying stratigraphic architecture. Analysis seismic data recognized three primary...

In this paper, the bifurcation analyses were made in a single-machine PQ dynamic-load system and classical 3-node system. It is verified that both SVC STATCOM compensation could effectively delay occurrence of saddle-node bifurcation(SNB) two systems, as greater gains devices are, better control effect to SNB point is; always plays than when concerned with same value their gains. can appears Hopf bifurcations, unstable bifurcation(UHB). When gain values are them small, UHB almost same; while...

Abstract Learning style changes from generation to generation. With the advancement of technologies, current and incoming tech-savvy learners grow up with digital world. Such technology makes learning more accessible. As one examples, mobile has become a commonly accepted embraced concept among younger generations. Effective occurs when teaching styles align well styles. To better serve need next-generation in accessible way, standalone module was developed for an undergraduate upper...

Structural assessment for collapse is commonly approached by observing the failure or of systems fully incorporating degradation. Challenges however exist in performance indicator damage measure due to compound impacts uncertainties external (seismic excitation) and internal (structural properties) characteristics with degradation behavior. To account uncertainties, state-of-the-art kriging nonlinear autoregressive exogenous (NARX) model explored this study replicate response...

Complex dynamic behavior of nonlinear structures makes it challenging for uncertainty analysis through Monte Carlo simulations (MCS). Surrogate modeling presents an efficient and accurate computational alternative a large number MCS. The previous study has demonstrated that the multi-input multi-output autoregressive with exogenous input (MIMO-NARX) model provides good discrete-time representations deterministic multi-degree-of-freedom (MDOF) structural systems. Model order reduction (MOR)...

This study proposes a new AC/AC "phase hopping" frequency conversion method based on the analyses of disadvantages conventional cosine wave-crossing method. The advantages this include no circulating current, dead time, and an output close to power frequency. also introduces basic principles analyzes these combined with voltage phase-changing comparison that are used analyze generation thyristor trigger pulses, including time duration. A simulation is conducted in MATLAB, waveform harmonic...

Objective: The use of multiple-stage cycloconverters is suitable for variable-frequency speed control high-voltage, large-capacity motors, which it sometimes necessary to establish separate controls operation and the start-up phase. This approach effectively limits starting current motor by switching phase relationship triple circuit’s output voltages overall voltage. Methods: We analyze a circuit using voltage vector analysis simulation with MATLAB modeling. Results: find that our...

The traditional load identification method is not sufficiently accurate because of the high computational complexity and small data specific customer. A depth for a power fingerprint based on transferability V-I trajectory proposed. First, uses bilinear interpolation technique to solve discontinuity grayscale images. current, power, phase numerical feature information are embedded in image by color encoding generate that contains rich electrical features. Then, images were used as input...

The research on the sensorless control of PMSM by using algorithm is a hot topic in field motor control. A system based low speed pulse high frequency stator flux injection proposed. traditional estimator improved. signal introduced into pass filter to improve accuracy operation motor. In view situation that without position sensor susceptible torque ripple PMSM, disturbance observer used suppress voltage error caused torque. this paper, rotor and designed, magnetic pole judgment criterion...

Current differential protection (CDP) has been applied as primary in traditional AC grid with the advantage of high reliability and sensitivity. However, due to non-linear characteristics inverter station commutation failures, CDP perform not well or even fail. performance is affected by numerous factors, including control strategy inverter, receiving system strength. Evaluating adaptability when receiving-end connected line commutated converter-based high-voltage direct-current (LCC-HVDC)...

AC withstand voltage test is the most severe, direct and effective method of judging XLPE Power Cable insulation Conditioning, It decisive significance in determining weather measured up. Traditional transformer bulky, it requires high-capacity power supply when used Cable. This paper adopted Frequency Conversion Series Resonance Technology 220kV Withstand Voltage program accomplished successfully, Greatly reduced capacity equipment, also helps to promote quality work efficiency, which...

This work evaluates the response of DFIG-based wind turbine under voltage dips caused by transformer energizing. The energizing is part normal operation power system and it can cause even-harmonic distortion, which could impact converters on turbine. Previous works only considered electrical faults, then other causes should be understood to guarantee sufficient fault-right through installations. In order address this study, measurements with distinct magnitude, harmonic distortion unbalance...

SF <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</inf> gas density sensor can monitor the change of in an electrical power equipment. The stable is great significance for ensuring security grid. According to statistics, low temperature level most sensors installed grid does not exceed -40°C, while lowest some parts China lower than -50°C. This research investigated working stability two types range from 20°C -50°C aspects basic function...