An interconnected multi-microgrids (IMMGs) system takes advantage of various complementary power sources and effectively coordinates the energy sharing/trading among MGs main grid to improve stability, reliability, efficiency system. The core this structure is achieve optimal distribution sharing through proper strategies. However, volatility intermittent characteristics renewable resources, time-varying loads in MGs, their correlated generations, coupled during trading, all bring about new...

Insufficient damping and inertia are the one of most tough challenges in grid-connected power system with high penetration renewable energy resources. Damping correction loop virtual synchronous generator (VSG) connected to weak R/X ratio condition is introduced solve issues. First, scheme proposed control implemented various operating conditions, small-signal model established. Subsequently, influence on stability demonstrated by Bode diagram analysis, interaction between reshaped VSG...

The most challenges for the hybrid energy storage system made up of battery and super capacitor (SC) are reasonable management strategy (EMS) real-time implementation. Therefore, a variable-step multistep prediction MPC-based is proposed in this paper, which minimizes losses whole operating process ensures current SC SOC suitable range. In addition, neural networks (NN) applied paper implementation, trained by using MPC optimization results. To do this, loss models battery, DC/DC converter...

A technique is presented for constructing compactly supported wavelets whose coefficients are composed of free variables locating in an interval by using a lifting scheme. An efficient approach-based wavelet image compression developed selecting the 9–7 filter and associated Furthermore, rationalised that can be implemented with simple integer arithmetic achieved its characteristic close to well known original irrational filters Cohen, Daubechies Feauveau. To further reduce computational...

Summary The radial basis function (RBF) network and autoregressive exogenous (ARX) model are combined to form the structure of RBF‐ARX model. can describe global nonlinear dynamic process object, its coefficients approximated by data‐driven method. structured parameters optimization method (SNPOM) is generally used optimize parameters, but this very complicated hard be mastered engineers. However, genetic algorithm (GA) simple widely used. So thought GA optimizing generated, called...

The flatness control system is a multivariate and complex with uncertainty of parameters. General modeling approaches can not satisfied the high precision demand rolling process. And it difficult to establish precise mathematical model mill. In this paper, T‐S cloud inference neural network proposed. It constructed by fuzzy network. for processing data rapidity logic are both taken into account synthetically. applied 900HC reversible cold A Virtual Flatness Intelligent Control System (VFICS)...

In aviation aircraft, autotransformer rectifier units (ATRUs) have been widely used as front-end rectifiers. The comprehensive analysis of its operating characteristics under the fault is beneficial to assessing hazards faults and developing a diagnosis scheme. This article investigates two types open-circuit (OC) in delta-polygon 18-pulse ATRU, namely, diode OC input fault. First, effects on five aspects are quantitatively analyzed: conduction angle, output voltage ripple, winding current,...

For a hybrid energy storage system consisting of battery and super‐capacitor (SC) in More Electric Aircraft, decentralised control strategy, which is based on the virtual impedance droop control, can implement frequency domain allocation load power avoiding communication delay single point failure. Although output voltage deviation state‐of‐charge (SoC) limitation are solved by existing methods, it still suffers from settling time extending. Secondary controls (SVCs) virtual‐droop‐controlled...

The electric tractor is based on utilizing power to support driving and working loads for the realize independent speed regulation. In addition, more have been equipped in that incurs randomness intermittence. Motivated by this, this paper proposed an advanced electrical system includes hybrid energy storage double motors tractor. online-wavelet transform then applied distinguish frequency of fluctuations reference, reduces dependence historical data. Then, high adjustment coefficient...

Based on the theoretical model of three-level converters, a mathematical predictive active power and reactive control is deduced. Relationship both with voltage vectors analyzed from an instantaneous perspective. Influence tendency caused by space are described in detail. Because different have effects neutral point potential, cost function related to error potential constructed. According function, optimum vector sequence determined. Correctness feasibility direct verified through...

With the rapid development of photovoltaic (PV) power generation, technology grid-connected system becomes an important part generation. Based on this background, grid connection techniques T-Type three-level inverter with LCL filter is studied in paper. The subject combines SPWM modulation strategy and dual current loop control strategy. Due to coupling relationship among LCL-filter parameters, it complicated design L C parameters filter. This paper analyzes selection parameters. strategies...

The three-level active-neutral-point-clamped (3L-ANPC) voltage source converter (VSC) is used to overcome the uneven loss distribution. In 3L-ANPC VSC dissipation in power device typically characterized by Sinusoidal Pulse Width Modulation (SPWM). junction temperature and load current of an actual system are detected calculate loss. This paper, firstly, calculates total losses under different factor angle modulation depth. Secondly, thermal resistance capacitance various elements from...

It is crucial for the reliable operation of autotransformer rectifier unit (ATRU) to accurately diagnose diode open-circuit (OC) fault. However, grid voltage disturbance may lead misdiagnosis by existing methods. This article takes 18-pulse ATRU as an example and first analyzes its sag-based fault feature in dc-link output (DLOV) caused OC under no disturbance. Then, reason discussed. Subsequently, a general diagnosis method with strong immunity proposed. In proposed method, DLOV waveform...