Evaluation of landslide susceptibility is essential to planning land and space utilization. For this purpose, the paper presents a case study from Fugu County, Shaanxi Province, China. Firstly, geological environment current state landslides in County were investigated. Then, slope, aspect, terrain relief, curvature, lithology, type, normalized difference vegetation index (NDVI) considered as condition factors, correlation between these carried out by using Multicollinearity Analysis method....

The proliferation of renewable generations significantly in power system increases the severity and possibility sub-synchronous oscillations (SSOs) recently. Monitoring SSOs is critical for setting up control strategies mitigating effectively. In many SSO events, oscillation frequency magnitude are time-varying, which brings great challenges to monitoring. This paper proposes an adaptive-reset extended Kalman filter (AREKF) method accurate estimation modes. Two improvements made EKF method....

The design of the China Imaging ALTimeter (CIALT) and flight experiment its airborne model are presented in this paper. system is aimed for providing observation measure both oceanic applications continental topographic mapping future. motivation project to develop a three dimensional imager fitted small satellites with volume, mass power consumption. An experimental CIALT has been developed verifying concept. integrates techniques together, i.e. height measurement tracking technique...

This paper is concerned with the theoretical model for SAR altimeter or Delay-Doppler radar altimeter. Work this aim, first, data process of introduced and some assumptions systems are introduced. And result in that mean echo could expressed as three terms convolution conventional Second, sub-fan-beam pattern formed by along track signal analyzed approximated one simplified Gaussian expression. Third, measurement geometry described common sense parameters delay, sea wave height, scatter...

This study proposed an algorithm for calculating the maximum transmission capacity considering unified power flow controller (UPFC). At beginning, equivalent virtual generator, located on ends of UPFC's branch, is obtained based source model UPFC. Then, purpose obtaining range power, (minimum) active/reactive treated as optimising object. Meanwhile, series voltage and shunt current UPFC, well other generators’ reactive are selected control variables. As a result, optimisation could be formed...

In this paper, based on the partial discharge ultrasonic signals of four typical types needle plate discharge, internal suspension and creeping in switchgear, time-frequency diagram signal is obtained by using short-time Fourier transform, used sparse representation algorithm. The classification performed to quickly accurately determine whether a has occurred which type it belongs to. process method, orthogonal matching pursuit method accelerated near-end gradient are solve solution...

In the grid processing of deflection vertical (DOV) for marine gravity recovery, traditional least squares collocation (LSC) gridding method only considers accuracy difference between different satellite radar altimeters, but ignores observation points same altimeter. order to solve this problem, a new LSC weighted by is proposed in paper. The sets quality parameters each observed value according dispersion data and gives corresponding weights residual along-track DOV based on error...

Following a large disturbance in the power system, voltage often experiences temporary drop, simultaneously triggering number of harmonic components. This phenomenon can lead to commutation failure and even direct current blocking, threating system stability safety. To accurately predict rapidly prevent failure, it is crucial analyze impact time-varying harmonics on process. Based wideband measurement data area (CA) theory, this paper quantitatively analyzes under normal operation condition...

GNSS buoys are innovative ocean instruments, and can provide calibrations of the sea surface height significant wave (SWH) products satellite altimeters. This paper investigated principles retrieval by buoys, proposed a method calibration altimeter SWH product buoys. The error sources in procedure were analyzed. Ocean campaigns implemented to measure at HY-2 nadir points, acquired bias +7.92±5.04 cm using four-parameters retracking algorithm. was +20.37±12.79 base on operational products....

Aiming at the MMC DC overcurrent problems caused by LCC commutation failure on receiving end, a fault ride-through method based current limiter is proposed, including topology structure, working principle, control and parameter design method. With help of limiter, sub-module capacitor discharge circuit DC-side monopole grounding can be blocked to protect valve set. When end leads overcurrent, limits through input resistor prevent from blocking alleviates overvoltage problem certain extent....

HY-2A satellite is the first ocean dynamic environmental in China, and radar altimeter onboard a land-compatible one, which particularly suitable for coastal applications. In this paper, attempt to apply altimetry data zone carried out offshore Hong Kong. The waveforms are extracted retracked, two approaches employed improve retracking performance: sub-waveform technology singular value decomposition (SVD) method. results pretty encouraging, indicating potential of

With the continuous improvement of spatial resolution spaceborne synthetic aperture radar (SAR), detection ultra-high voltage (UHV) power transmission line in high-resolution SAR images has become possible. However, backscattering characteristics UHV a image are significantly influenced by several factors including span length and polarimetry. In this paper, effects polarimetry on analyzed using TerraSAR-X images. We first give brief introduction to imaging geometry line. Subsequently, for...

An airborne delay Doppler altimeter was flown in autumn 2014. A calibration suite including a GNSS buoy, two tide gauges and GPS stations were established. experiment carried out to test the buoy as whole under dynamic ocean condition, validate its performance accuracy via inter-comparison of gauges, demonstrate altimetry methods estimate system bias. This paper presented some results. The proven have ability measuring sea surface height within 1cm, bias had consistency centimeter level.

The concept of Delay/Doppler Radar Altimeter (DDA) was proposed by R.K Raney^[1] to improve the spatial resolution in along-track direction, for rougher surfaces more irregular than open oceans. DDA also has many new advantages when it is used oceans, such as stronger response, being less sensitive off-nadir angle errors, and significant wave height (SWH) Conventional Altimeters (CRA). These features will be validated simulations this paper.

SAR has been proven to be a useful tool for ocean oil spill detection due its large coverage, independence of the day and night cycle all-weather capability. In this paper, one operational visual method using image was performed key information, such as location also demonstrated. The results show that by will play an important role in marine environment protection.

With the widespread integration of renewable energy in power system, a large number thermal units will be decommissioned next decades. The decommissioning and into grid lead to amount reactive requirement, which can sastisfied by renovation sychronous compensator. However, traditional decomissioning method just takes advantge generation, abandon inertia steam turbine lack support ability. In this paper, is firstly demonstrated transform compensator with high that provide support. And then...