As the penetration level of distributed photovoltaic (PV) systems keeps increasing in distribution networks, overvoltage due to reverse power flow is an urgent issue be addressed. This paper proposes a voltage regulation method by utilizing control capability PV inverters. A novel network partition approach based on community detection algorithm presented realize zonal shorter response time using minimum amount reactive compensation and active curtailment. An improved modularity index that...

Owing to increasing photovoltaic (PV) systems installation, especially large-scale ground-mounted PV plants, the role of power generation is gradually changing from a supplementary energy an alternative resource, with respect conventional generation. It important and necessary evaluate capacity value systems. This paper introduces artificial neural network-based empirical model plant's credit, in which effective load carrying capability utilized calculate utility-scale plants. A novel metric...

In a large-scale data environment, the "curse of dimensionality" high-dimensional feature spaces and large amount noisy make efficiency accuracy intrusion detection systems (IDSs) significantly decrease. To address these challenges, underlying algorithm can not only reduce dimensionality, but also remove some redundant irrelevant noise from massive data. Accordingly, herein, an IDS combining deep belief network (DBN) with feature-weighted support vector machines (WSVM) is proposed. First,...

This paper presents a pricing mechanism for pumped hydro energy storage (PHES) to promote its healthy development. The proposed mechnism includes PHES and cost sharing mechanism. Regarding the mechanism, existed two-part tariff is still recommended implement at current future stages. it suggested that electricity capacity fee pumping-loss should be all included in allowable transmission distribution costs of regional power grids, which can further transmitted provincial grids. At same time,...

Because of the limited absorption coefficient and undesired reflection loss, it has been a challenge to obtain sufficient light for type-II superlattice (T2SL) long wavelength infrared (LWIR) detectors with thin thickness. Here, we report greatly enhanced photon by harvesting in InAs/GaAsSb T2SLs grown on InAs substrates. High quantum efficiencies (QEs) were first observed set LWIR photodetectors different layer thicknesses. Long minority carrier diffusion lengths are also indicated....

Recently, collaborative learning is proposed to amortize massive computation costs of highly sophisticated artificial intelligence (AI) tasks. To attract lots participants, researchers investigate blockchains ' economic incentives with proof useful work (PoUW) consensus protocols motivate substantial numbers miners in a mining pool complete AI However, participants might be untrusted and defraud rewards as less possible efforts. In the paper, we propose robust efficient scheme called RPoL...

Recently, smart contracts have been widely applied in security-sensitive fields yet are fragile to various vulnerabilities and attacks. Regarding this, existing research efforts either statically scrutinize contracts' code or detect suspicious transaction execution flows. However, they fail timely protect only handle a small subset of well-known vulnerabilities. In the paper, we propose <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">...

To deal with a kind of uncertainties existed in the complex industry processes, new design method robust proportional- integral- derivative (PID) controller based on coevolutionary particle swarm optimization was presented paper. The parameters tuning problem for PID reduced to solve maximum-minimum problem. A co- evolutionary algorithm (PSO) used this issue, and optimal performance index obtained. For continuous stirred tank reactor(CSTR) system under wide range operating conditions,...

The effect of Be doping on the quantum efficiency and dark current InAs/GaSb long-wavelength infrared superlattice photodetectors grown by molecular-beam epitaxy GaSb substrates are reported. A significant improvement (QE) with p-type is demonstrated. Our results show that level at 2.5 × 1015 cm3 gives highest product 28%. We also demonstrate increased QE not only resulted from longer minority carrier diffusion length, but p—n junction location change. Finally, result shows sample a density...

Energy storage can effectively promote the efficient use of renewable energy, and interconnection various kinds is one key technologies energy Internet. This paper summarizes current situation China's development from aspects scale, technical economy industrial chain, studies trend technology according to objective needs Internet development. At same time, based on "source-network-load-storage" coordinated planning theory, medium-term long-term prospects are forecasted macro level, important...

On the basis of an overview world's energy situation and outlook renewable generation high voltage transmission techniques, a global interconnection (GEI) construction is proposed, which can achieve electricity exchange. For proposed GEI system, power delivery potentials for main large-scale bases located in different continents are analyzed. In this paper, concept "interconnection risk" introduced to describe impact changes political risk international on cost first time. With objective...

Using non-equilibrium molecular dynamics and Monte Carlo methods, we study the collective diffusion of helium in carbon nanotubes. The results show that coefficient (CDC) increases with dimension channel. has a linear relationship temperature concentration. There exist ballistic transport short nanotubes diffusive long Fick's law an invalid region nanoscale

This paper forms the annealing genetic hybrid algorithm, which is about algorithm and simulated improved integrated. For problem feature selection of nonlinear analog circuit fault diagnosis based on Volterra kernel, using to research, put forward intelligent method feature. Experiments show that this has realized effective diagnostic features prediction accuracy system BP neural network.

This paper proposes a coordinated control strategy for islanded microgrids (MGs) including bus voltage compensation and dynamic power sharing. The droop is used to realize sharing among the distributed generations (DGs) in primary layer. On this basis, secondary with regulation current correction proposed. compensates DC drop caused by traditional control, thus restoring rated value. Moreover, coefficient designed be adjusted constantly, which achieves high precision of simulations under...

Fine-blanking is a molding process based on the common blanking process, which obtains hydrostatic stress through blank holder reverse jacking, in order to increase material plasticity. It requires special equipment, namely fine-blanking press, complete process. In this paper, problem of speed slide block fluctuation found actual use 12,000 kN hydraulic press after multi-stage pressure source optimization studied. Firstly, mathematical model motion stage fine established, and accurate...

How to accurately represent a high-dimensional and sparse (HiDS) user-item rating matrix is crucial issue in implementing recommender system. A latent factor (LF) model one of the most popular successful approaches address this issue. It developed by minimizing errors between observed entries estimated ones on an HiDS matrix. Current studies commonly employ L <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> -norm minimize because it has...