Faulty feeder detection helps ensure the stable operation after single line-to-ground (SLG) faults in distribution networks. However, SLG fault currents are weak, conditions complex, and distortion of signals may occur owing to effect distributed generators (DGs), which would result unacceptable performance existing methods. To improve accuracy faulty under high penetration DGs, this paper firstly analyzes three-sequence networks with DGs connection, points out that connection does affect...

Accurate fault location technology for distribution lines is of great importance as it can shorten power outage time and enhance supply reliability. Current voltage transformer errors line parameter will result in error the existing algorithms, which cannot meet requirements To solve this problem, a data-fusion model based on multiple algorithms proposed study, makes full use results algorithms. First, complementarity among four selected analyzed. Then feasibility improving accuracy by...

Multi-frame super-resolution recovers a high-resolution (HR) image from sequence of low-resolution (LR) images. In this paper, we propose an algorithm that performs multi-frame in online fashion. This processes only one at time instead co-processing all LR images which is adopted by state-of-the-art techniques. Our very fast and memory efficient, simple to implement. addition, employ noise-adaptive parameter the classical steepest gradient optimization method avoid noise amplification...

The plenoptic wavefront sensor (PlWFS) has been proposed as being suitable for operating on extended objects in adaptive optics (AO) systems. We propose a new self-referencing method that uses the cell image of PlWFS correlation reference and enables simultaneous measurement high-order aberrations tilt. Simulations have performed different conditions to verify feasibility method. These show using results better AO performance compared existing generation techniques allows stable tilt control...

Thermal aberrations in high-power solid-state lasers degrade the beam quality and cause diffraction losses that reduce output power. Adaptive optics system can be used to compensate for wavefront distortions real time clean up beam. But conventional adaptive based on sensing can't work well with laser cleanup because of presence branch points phase amplitude scintillation. However other kind model-free optimization a scalar beam-quality metric provides an attractive approach perform smaller...

An adaptive optics (AO) system composed of multiple control levels based on the stochastic parallel gradient descent (SPGD) technique is discussed. Results numerical simulations demonstrate that convergence rate 3-level SPGD wave-front correction increased by 23% compared with usual correction.

The feasibility of realizing beam cleanup high power lasers using stochastic parallel gradient descent (SPGD) wavefront control method has been demonstrated numerically. numerical model an adaptive optics system comprising a 44-element deformable mirror and far-field performance metric sensor is first setup which operates with the SPGD method. then used to correct for dynamic aberrations laser where phase screens are constructed from simulation data introduced into light wave time...

Coherent beam combination of fiber laser arrays plays an important role in realizing high power, radiance systems. The stochastic parallel gradient descent (SPGD) algorithm is a newly developed optimization method using the technique perturbation and approximation it expected that this can reduce cost complexity power system when incorporated its scheme. In paper, numerical simulation model about then established based on beam-quality-metric method. SPGD introduced used to realize...

ABSTRACT Adaptive optics (AO) is widely used in ground-based telescopes to compensate the effects of atmosphere distortion, and wavefront sensor a significant component AO systems. The plenoptic has been proposed as an alternative adequate for extended objects wide field views. In this paper, experimental bench set up investigate slope measurement accuracy closed-loop correction performance objects. From results, it confirmed that suitable sensing with proper optical design. measurements...

Multi-frame blind deconvolution (MFBD) is a well-known numerical restoration technique for obtaining highresolution images of astronomical targets through the Earth's turbulent atmosphere. The performance MFBD algorithms depend on initial estimates object and PSFs. Even though observed image might be close to could used estimate object, as often case with PSFs, we lack prior knowledge PSFs each image. In order provide high-quality improve algorithm, one most effective methods introducing an...

Adaptive optics plays an important role to compensate the atmosphere turbulence therefore concentrate laser energy for satellite-ground communication. However, as satellite especially LEO (Low-Earth orbit) moves, communication from downlink (satellite ground) and uplink (ground satellite) will experience a different path, called point ahead angle (PAA). PAA can be much larger than isoplanatic strong or fast moving satellites, causing AO system not working. For now there is no simple...

Demand response (DR) can effectively balance the contradiction between power supply and demand promote integration of renewable energy into grid by changing end user's curve through control strategies. Relevant research has begun to pay attention important role building users in response. The current experimental on is only focused single building, because experiment simultaneous for multiple buildings restricted various external factors. However, load a relatively small compared entire...

Deconvolution from wavefront sensing (DWFS) is a high-performance image restoration technique designed to compensate for atmospheric turbulence-induced distortions. It uses simultaneously recorded short-exposure images of the object and high cadence sensor (WFS) data estimate both wavefronts object. Conventional DWFS takes no account temporal correlations in WFS data, which limits reconstruction high-spatial frequency components distortion then recovery This paper frozen flow hypothesis...

Speckle imaging techniques are effective post-processing methods to eliminate atmospheric perturbations on the of space objects, in which speckle interferometry and bispectrum usually used estimate magnitude phase spectrum objects separately. The spectral ratio technique this paper is convenient efficient evaluate r0, crucial for calibrating transfer function estimation. It shown that power spectrum, second moment needs bias removal whereas processing does not. Reconstructed images from...

多帧盲解卷积图像复原技术能够进一步提高自适应光学图像的分辨力，但其算法比较复杂，处理耗时过长，对序列图像复原经常需要几分钟甚至几十分钟的计算时间，对实际应用造成了极大不便。为了提升算法的运行速度，改善其耗时过长的问题，通过研究和分析盲解卷积算法原理和算法结构，采用目前高速发展的中央处理器（CPU）和图形处理器（GPU）异构加速技术，主要对耗时最长的矩阵卷积运算进行优化，通过使用库函数与算法结构微调相结合的方法并行加速，实现多帧盲解卷积的图像复原算法的并行化。使用并行算法对图像进行复原处理，针对16帧以上分辨率为256256像素的空间目标图像，可以实现17的加速比，为图像复原的实时/准实时提供一种可行的方案。

Space object images obtained through ground-based telescopes tend to be heavily blurred and degraded by the atmospheric turbulence as well detection noise aberrations of optical systems. Multi-Frame Blind Deconvolution (MFBD) is currently mainstream image restoration algorithm for turbulence. MFBD jointly estimates original corresponding point spread functions (PSFs) from a sequence short-exposure images. From our experience, there are still lot space improvement traditional algorithm. The...

In a high-energy laser, the thermal aberrations degrade beam quality and reduce laser's output power. Adaptive optics (AO) technique based on stochastic parallel gradient (SPGD) algorithm can be used to compensate for distortions in real time clean up laser beam. Such clean-up system was simulated experiments were conducted study optimization of parameters gain coefficient amplitude perturbation. The results show that convergence property SPGD is improved after being optimized.