Due to the influence of current sampling and reconstruction deviation, non-linearity inverters parameter variation motors, DC offset component high-order harmonic components exist in flux model, which makes estimation traditional rotor observer inaccurate even divergent. In this paper, a permanent magnet synchronous motors (PMSM) with adaptive compensation is proposed. The integrator can be eliminated by fed them back input through PI regulator, so that output only contains fundamental...

To improve the radial suspension force of heteropolar hybrid magnetic bearing (HMB), a novel AC six-pole HMB is proposed. Firstly, structure, circuit, and generation principle are introduced analyzed. Secondly, equivalent circuits established. The mathematical models resistances, air gap fluxes, levitation derived by node magnetomotive (MMF) method. main parameters prototype HMB, such as outer inner air-gap length, winding turns, permanent magnets, designed. Then, analysis model established...

When the permanent magnet synchronous motor (PMSM) works in high-speed region with low carrier ratios, performance of rotor flux observer has a great influence on loading capacity and stability speed sensorless vector control system. The problem adaptive compensation (ACFO) PMSM at ratios is analyzed this paper, an ACFO feedback delay component presented. After retuning PI regulator parameters, new expression related to ratio obtained, which can improve make torque current loop response...

As we know, SC-FDMA has been adopted as the uplink access technique in 3GPP LTE standard due to its low PAPR. However, PAPR is still an issue for SC-FDMA, especially with localized subcarrier allocation scheme. In this paper, propose a new SLM method feedback searching, where, ZC (Zandoff-chu) sequence considered initial phase rotation factor, and searching algorithm utilized update. Simulation results show, can be reduced efficiently not only conventional OFDM system but also method....

In this paper, we present an automated and distributed real-time video surveillance architecture used to develop intelligent system. It has two features: (1) each terminal is designed as agent, which responsible for raw information processing from its according sensors, it ensures that all processed in the front-end of system only results are transmitted through IP network. Furthermore, automatic storage, recording data transmission mechanism based on events applied realize demand. All these...

This paper highlights the operating performance of oil-immersed transformer in extreme cold environment along with researches on moisture variations oil-paper insulation system and its effects caused by ambient temperature. As one main factors that affect electric strength insulation, for oil immersed paperboard are experimental studied, as well transfer rule between variation The results showed decreasing temperature, reduces first then increase, an value occurs at temperature −10 °C −0 so...

In this paper, a new simulation approach for solving the mixed train scheduling problem on high-speed double-track rail line is presented. Based discrete-time movement model, we propose control strategies with different speeds line, including braking strategy, priority rule, travelling and departing rule. A detailed algorithm also presented based proposed movement. Moreover, analyze dynamic properties of traffic flow line. Using our method, can effectively simulate schedule The numerical...

A direct-type lead exit for ultra high voltage (UHV) transformer was designed, and the electric field of calculated analyzed by using finite element method. Then, its insulation structure optimized. The stress distribution displacement under vibration condition were investigated. reliability verified electrical test test.

The novel three-phase rotary transformer is an attractive solution to replace the brushes and slip rings of doubly fed induction generators. main dimensions are optimized by single-objective genetic algorithm. To get accurate parameters proposed transformer, two kinds model, classical ideal model UMEC derived. influence geometry design on its performance discussed 3-D Finite Element Analysis method. finite-element analysis experimental results used verify obtained analytical model.

In recent years, power grid enterprises have continuously promoted the construction of intelligent operation inspection system. Pilot applications various equipment status sensors, online monitoring devices, wearable mobile terminals and Beidou navigation satellite system been gradually carried out. The configuration range such as UAV robot has expanded, big data analysis technology, artificial intelligence diagnosis technology also preliminarily applied. With continuous development...

Transformer bushing is an outlet device which leads the internal high-voltage to outside of transformer. It not only important part power transformer, but also very transmission equipment. The effective condition assessment for transformer bushing, guide operation and maintenance reduce failure probability, have theoretical practical significance. This paper focuses on bushing. Aiming at problem that there are so many assessing factors indices, may reflect different aspects weights,...

Moisture is one of the critical factors that lead to deterioration insulation oil-immersed power transformers. This study develops a novel feature parameter called nonlinear coefficient <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\alpha $ </tex-math></inline-formula> notation="LaTeX">${U}$ – notation="LaTeX">${I}$ per-unit curve assess moisture content in transformer insulation. Results reveal...

The battery power state (SOP) is the basic indicator for Battery management system (BMS) of energy storage (BESS) to formulate control strategies. Although there have been many studies on estimation lithium-ion batteries (LIBs), aging and temperature variation are seldom considered in peak prediction during whole life battery. To fill this gap, paper aims propose an adaptive method considering proposed. First, Thevenin equivalent circuit model used jointly estimate charge (SOC) SOP battery,...

We proposed a model of the train rear-end collision accidents based on stochastic Petri nets (SPN) theory. By isomorphic Markov chain accident model, we provide quantitative analysis accidents. Fuzzy random method is also applied to analyze performance model. In addition, according data extracted from large amount historical statistics, present case and discussion. It showed that results SPN are reasonable in practical applications can be used effectively prevent loss, may reference...

HVDC converter transformer is a highly nonlinear transmission of harmonic source, which produces large amounts current during the operation. The losses caused by share more than half stations' losses, and affect temperature rise load capacity transformer. For safe economic operation transformer, accurately measuring transformer's has great significance. This paper propose method measurement based on power source applying 1/2 rated AC side According to comparison calculation test result, this...

Abstract This study investigated the impact range of pipeline leaks for light oil pipelines under different operating conditions. Three calculation methods were employed to influence various factors, including obstacle height, wind speed, leak hole diameter, and slope, on flowing fires, pool overpressure waves. The results indicate that decreases as height obstacles increases. most significant decrease occurs when are 2 meters high, further increasing leads a less pronounced decrease. Wind...

Abstract As the transmission capacity of ± 800 kV ultra-high voltage project is increased to 10 GW and 1100 12 GW, requirements for flow level various equipment have been improved. Due limited overall design size, margin converter transformer approaching its limit. weight a single reaching hundreds tons huge amount material used, physical property testing electromagnetic wire insulating cardboard in existing IEC standards can no longer meet engineering use. This study focuses on main...

This paper proposes a distributed architecture for cooperative vehicle-infrastructure sensing, leveraging blockchain and sensing-communication consensus system to empower intelligent connected vehicles. The comprises three layers: perception layer, an edge control cloud computing layer. layer consists of heterogeneous sensors continuously collecting panoramic environmental data, which are then authenticated stored on the blockchain. deployed roadside, is responsible local data fusion,...