Analytic Hierarchy Process (AHP) is presented in this paper to measure the relative criticality for transmission lines, considering changes of power system’s status about lines overload, central buses voltage over-limit and transient stability. At first hierarchy structure modeled, then indexes criteria Layer including line overload index, index stability were presented. The simulation results show that, AHP assessment method can give a full consideration lines’ function, which huge...

In the analysis of cascading failure, multiple failures is necessary to take into account under a certain condition, and occurrence probability severity are varies with change operating mode caused by equipment maintenance. this paper event tree used in on use approximation theory rare order divided, thus screening process can be simplified. Applying method overload from case simulation results it seen that proposed searching reflect variation failure well, assess risk maintenance better,...

Power control unit (PCU) is the controlling center of space satellite power system; it controls energy that output from solar array and batteries balance whole satellite.The circuit board, components tube in PCU working a long time high situation, so reasonable thermal design crucial for PCU.Thermal simulating analysis done this paper.The model established temperature distribution calculated by electronic equipment software Flotherm, according to system input conditions related requirements.

Power control unit (PCU) is an important component of space power system on satellite; it provides supply to main bus and regulates output status solar battery array in light district. So very test the performance PCU before equipped satellite. A semi physical for developed this paper, some Agilent simulators are used simulate working environment PCU, software programmed these simulator as well.

The off-grid inverter with the side voltage as feedback parameter has advantages of a single loop, simple control design, and low cost. But output accuracy is not enough. A single-stage feedforward recommended to improve accuracy. It higher regulation rate compared proportional–integral (PI) it can track given AC signal at any frequency proportional-resonant (PR) control. Bus capacitors employ thin-film for improved reliability power density stress on devices be decreased by controlling...

Fault phase selection is studied in this paper based on the wavelet power spectrum entropy and LIBSVM for transmission line. First, MATLAB used to simulate five fault types obtain a variety of voltage waveforms. Second, simulation waveform transformed extract energy which pretreatment greatly reduce number data dimensions effectively optimize input LIBSVM. Finally, select phase, experimental results show that method very effective.

Quantizaion is the first step in converting analog signal into digital signal.In distributed video coding, a 4x4 quantization matrix used to quantize each coefficient.However, such scheme fixed and can not be adaptively adjusted according characteristics of stream.This paper proposes an adaptive scheme(AQ).Under premise guaranteeing quality, algorithm adjusts threshold quantitatively by estimating correlation noise model on encoding side.It also improve rate-distortion performance decoding...

Based on the detailed analysis of power collection system offshore wind farm, establishing a mathematical model to evaluate its economy and reliability, proposing topology optimization mode farm based improving single parent’ genetic algorithms. Example shows that proposed can consider reliability in overall rapidly at same time get results. Compared with traditional algorithm, rate convergence is faster better which provide design large-scale photovoltaic station reference.

The heterogeneous characteristics of the components complex power grids in terms operating conditions, grid structure, status, etc., will play a negative role fuel cascading failures, thus posing serious threat to security. This paper analyzes heterogeneity tidal current operation, mainly as trend distribution curve exhibits exponential and power-law semi-logarithmic double-log curves. Based on Lorentz Gini coefficient concept economics, it is proposed that can be used characterization index...

Generation outages, transmission line contingencies, natural gas pipeline compressor failures as well source and load fluctuation are posing a great threat to the secure operation of combined system power system(CGPS). To quantify risk level caused by these dangerous factors, this paper proposes generalized CGPS assessment model, in which modeling linepack tank taking into account. Besides, calculating specific electricity loss utilizing state-based non-sequential Monte Carlo method, effects...