A computational model is used to investigate the characteristics of atmospheric radio frequency discharges by increasing from 20 100 MHz at a constant power density. The simulation results show that can effectively enhance electron density before transition but after it ignition quenched then decreases. However this also indicates maximum time-averaged energy reduces monotonically with excitation

Fault current limiter (FCL) is expected to ease the burden on circuit breakers by limiting fault a desired level. However, depends not only interrupting but also rate of rise recovery voltage (RRRV). Based an equivalent model inductive FCL and with respect terminal short-line respectively, strict mathematical formula are presented describe relationship between RRRV limit factor, stray capacitance as well distance. Further, detailed computations were carried out regarding 220-kV transmission...

It is well accepted that increasing the frequency and reducing electrode gap are effective ways to enhance discharge stability in atmospheric radio-frequency (rf) discharges. In this paper, we explore a 1-D fluid model investigate characteristics when α-γ mode transition occurs. The differential equation satisfied at point given based on governing equations. From theoretical analysis computational data, with an increase gap, power density coupled plasmas decreases, critical electron modestly...

The electrode-gap effects on discharge characteristics have attracted increasing attention in the design of atmospheric devices. In this paper, a 1-D fluid model is used to explore influences electrode gap electron density and temperature radio-frequency discharges under constant power condition. As increased, both applied voltage current increase computational data analytical equations show monotonic density; peak sheath increases but decreases bulk plasma region. At density, altering can...

With the large-scale expansionary of electric vehicles (EVs), charging facilities on highway have also been developed rapidly as supporting services, providing convenient and fast services for vehicle users. Due to limited number capacity facilities, it is difficult meet diverse queue waiting time needs EV users during peak periods. Meanwhile, considering integration distributed photovoltaic energy storage system (DPV-DESS) highway, this paper aims at proposing a strategy coordinate multiple...

In addition to the traditional long-distance and bulk power transmission application, HVDC system can bring additional benefits by providing ancillary service. The high-voltage direct-current (HVDC) regulate its flow in a very short time be used provide emergency support rescue disturbed from bad conditions. However, because generators cannot meet great demand of time, fast response may cause severe power-unbalance events supporting system. this paper, combination frequency control (CFRC) is...

Source-grid-load-storage has represented an interactive characteristic in the active distribution network (ADN). Moreover, power electronic devices have been widely used for source-grid-load-storage with rapid development of electronics technology. In this condition, large-scale distributed source may cause voltage quality degradation, while application equipment also lead to serious harmonic distortion. Power become one most important issues ADN. paper, ADN is analyzed. Firstly, considering...

Integrated energy system can combine power, thermal and natural gas systems, which effectively improve efficiency maximize benefits. The research on integrated covers many aspects, among the modeling optimization of are more important. On basis existing literature system, this paper summarizes methods key issues respectively. At same time, a typical is optimized to verify feasibility relevant methods. In addition, also makes prospect for future development puts forward reasonable suggestions...

The evolution of machine learning has increasingly prioritized the development powerful models and more scalable supervision signals. However, emergence foundation presents significant challenges in providing effective signals necessary for further enhancing their capabilities. Consequently, there is an urgent need to explore novel technical approaches. In this paper, we propose verifier engineering, a post-training paradigm specifically designed era models. core engineering involves...

With the developments of distributed renewable energy and direct current (DC) based loads in recent years, power electronic converter has been widely used distribution network. However, due to lack a harmonic model suitable for different types converters, evaluation harmonics caused by large-scale integration is limited In this paper, unified converters on state-space (HSS) modeling proposed realize steady-state characteristic analysis various converters. The could capture coupling...

The ultrasonic method (AE) is more and widely used in partial discharge (PD) pattern recognition, however, it difficult to detect the PD level by AE method. So necessary find relationship between acoustic waves for different patterns. In this paper, an approach degree of based on feature extraction correlation analysis has been proposed. work, three typical models were designed, then amount (Q) from electrical signals waves, amplitude (A) duration time (DT) energy (E) are extracted as...

Partial discharge (PD) pattern recognition plays an important role in determining insulation defects and understanding condition of transformers. In this paper, four PD models are set up laboratory pulse current method is used to measure the amplitude apparent charge, power frequency phase pulses pulses. There 19 feature parameters which include fractal features, moment textural features extracted form grey-scale images resolved partial (PRPD) patterns. order reduce computational complexity...

Abstract Many problems have been exposed in the development of self-provided power plants, how to reform plants is very important. The construction a comprehensive energy system covering has become new reference idea, which can guide direction energy. This article first introduces status and concept integrated detail, then analyses potential relationship between systems based on characteristics three main applications field future, finally put forward related smart captive give some relevant...

The latent fault in cables cannot be identified by conventional relay protection due to its short duration and small current. In order prevent it from developing into a permanent fault, is necessary detect identify the of cables. traditional detection based on machine learning method needs mine large amount data, but there are few abnormal power data samples. At same time, this process prone overlearning problems. This paper introduces guiding model combination domain empirical knowledge...

The high penetration of distributed renewable energy resources (DERs) and various fast increasing direct current (DC) loads significantly facilitate the development low voltage DC (LVDC) systems. Novel power electronic devices further provide opportunities for flexible interconnection alternating (AC) networks. However, there is still a lack international standards concerning quality. In addition, it not clear whether relevant quality research applies to LVDC this paper, definition issues...

The passive wireless temperature measurement system based on SAW is a better method than the fiber optic and infrared in measuring of electrical equipment, but environmental characteristics have an effect it. In this paper, effects open space closed are studied by experiments. has greater signal because polarization direction antenna; metal cabinet, whether there sheet metallic object near senor or not, it no signal, which mainly that reflections electromagnetic signals internal walls...

Lithium-ion battery energy storage system is of positive significance for improving the flexibility power with a high proportion new integration. Along their or densities, portability, and promising life cycle, lithium-ion batteries have large advantage in application systems. However, lithiumion characteristics are appreciably affected by temperature. In low-temperature environment, there deterioration characteristics, life-cycle, as well available capacity storage, which not conducive to...

With the global interest in carbon neutrality, renewable energy generation (REG) industry has developed rapidly past few decades. In order to improve integration efficiency of REG like photovoltaic (PV) arrays, direct current (DC) power system is re-adopted after almost 100 years. more and demonstrations or business systems under operation, practical applications on DC microgrids transportation have proven feasibility buildings. buildings, routers are used regulate flow among electronic...

With the increase in land expropriation costs and installation metropolis, expansion of urban power grid becomes a challenge. The new substation city meets many issues, such as environmental protection, high-cost price, other social factors. In order to solve these multi-station fusion energy station has become prospective solution recent years. This paper conducts comprehensive review topology selection supply modes for stations. Firstly, characteristics their related topologies are...