Buffer system selection of a steady-state external equivalent model for real-time power flow using an automated sensitivity analysis procedure

1988 ◽  
Vol 3 (3) ◽  
pp. 1104-1111 ◽  
Author(s):  
R.R. Shoults ◽  
W.J. Bierck
Keyword(s):  
Sensitivity Analysis ◽  
Steady State ◽  
Real Time ◽  
Power Flow ◽  
Analysis Procedure ◽  
Equivalent Model ◽  
Buffer System ◽  
System Selection ◽  
Selection Of

Integration of Power System Real-Time Digital Simulator and Optimal Power Flow

2012 ◽  
Vol 590 ◽  
pp. 195-200
Author(s):  
Meng Jen Chen ◽  
Yu Chi Wu ◽  
Wen Shiush Chen ◽  
Pei Wei Huang ◽  
Tsung Wei Tsai
Keyword(s):  
Steady State ◽  
Power System ◽  
Real Time ◽  
Power Flow ◽  
Optimal Power Flow ◽  
Optimal Power ◽  
Communication Architectures ◽  
Analog Channels ◽  
Real Time Digital Simulator ◽  
Steady State Performance

In this paper, a framework for integrating a real-time digital simulator and EMS-OPF program is proposed and addressed, through two different communication architectures: asynchronous and synchronous. Validation of these communication architectures is carried out by Ethernet UDP/IP (asynchronous) and analog channels of IO card (synchronous). With this framework, both dynamic and steady-state performance of a power system can be studied easily in real-time mode.

An on Line Method of the Steady-State Data Acquisition

2013 ◽  
Vol 385-386 ◽  
pp. 668-674
Author(s):  
Jia Yang ◽  
Hai Bao ◽  
Ling Wang ◽  
Gang Liu
Keyword(s):  
Steady State ◽  
Power System ◽  
Real Time ◽  
Power Flow ◽  
Measured Data ◽  
Electric Power System ◽  
Power Flow Calculation ◽  
Flow Calculation ◽  
State Data ◽  
The Real

Steady-state power flow calculation belongs to power system steady-state analysis, and the data used in calculation should be steady-state data. However, the existing SCADA system hasnt distinguished the transient data from the steady-state data. The real-time measured data reflect the dynamic electric power system. It is the right reason for not all of the real-time measured power can be used for power flow calculation. In another word, it causes the matching problem between measured data and power flow calculations. Based on the current situation of information collection system, the characteristics of the measured data had been analyzed in this paper. And an effective acquisition method for steady-state measured data is proposed on the theoretical basis of the law of large numbers. It uses the average value of the measured data that in the same load state to approximate the steady-state true value in one period. And the steady-state data can be used in power flow calculation. The simulation results show that the method proposed in this paper ensures the accuracy and reliability of power flow calculation.

Uncertainties in Predictions by Thermal-Hydraulic Codes: Approaches and Results

2010 ◽  
Author(s):  
A. Petruzzi ◽  
F. D’Auria
Keyword(s):  
Complex System ◽  
Experimental Data ◽  
Sensitivity Analysis ◽  
Measured Data ◽  
Probability Density Functions ◽  
Analysis Procedure ◽  
Density Functions ◽  
Uncertain Parameters ◽  
Industrial Level ◽  
Selection Of

The present paper deals with the description of the salient features of three independent approaches for estimating uncertainties associated with predictions of complex system codes. The 1st approach is the “standard” one and the most used at the industrial level: it is based upon the selection of input uncertain parameters, on assigning related ranges of variations and, possibly, PDF (Probability Density Functions) and on performing a suitable number of code runs to get the combined effect of variation on the results. In the 2nd approach the uncertainty derives from the comparison between relevant measured data and results of corresponding code calculations. The 3rd approach is based upon a sensitivity analysis procedure and uses the experimental data to characterize the ranges of variation of ‘all’ input parameters. Selected results from the application of the 2nd approach are outlined.

scholarly journals On-line Update Method for the Sensitivity Consistency Model of Interconnected Power Grid Based on Electric Power Big Data

2021 ◽  
Vol 256 ◽  
pp. 01014
Author(s):  
Shuai Lian ◽  
Bintang Li ◽  
Jianbo Wang ◽  
Rui Jiang
Keyword(s):  
Real Time ◽  
Power Flow ◽  
Power Grid ◽  
Power Grids ◽  
Equivalent Model ◽  
Power Flow Calculation ◽  
Flow Calculation ◽  
Interconnected Power Grids ◽  
Calculation Results ◽  
Grid Based

Real-time fast calculation of the power flow of the interconnected power grid is an important guarantee for the reliable operation of the interconnected power grid. The topology of the interconnected power grid is complex, and the calculation of the power flow of the whole network is large and timeconsuming. The sensitivity equivalent model can effectively simplify the interconnected power grid and shorten the time of the power flow calculation of the whole network. The operating state of the power grid is constantly changing. In order to ensure the accuracy of the power flow calculation results, it is necessary to update the uniform sensitivity equivalent model in real time. Due to factors such as the vertical management system between the interconnected power grids and the principle of commercial confidentiality, it is difficult to share information between interconnected power grids in real time, and the sensitivity equivalent model cannot be updated in real time, resulting in too much error in the calculation results and no reference value. To solve this problem, this paper proposes an online update method for the sensitivity equivalent model of the interconnected power grid based on power big data to solve the problem of excessive power flow calculation errors caused by the untimely update of the equivalent model parameters, and to ensure the operational reliability of the interconnected power grid.

Estimation of Real-Time Equivalent of Power System for Distribution System

2009 ◽  
Vol 10 (1) ◽  
Author(s):  
Kasi Viswanadha Raju G ◽  
Pradeep R. Bijwe
Keyword(s):  
Power System ◽  
Real Time ◽  
Distribution System ◽  
Power Flow ◽  
Computational Effort ◽  
Equivalent Model ◽  
Equivalent Representation ◽  
Proposed Model ◽  
Three Phase

Distribution power flow methods by and large consider the substation voltage to be known and fixed. This type of model is not suitable for stressed system conditions. Although some power flow software may allow an equivalent representation of the transmission and sub-transmission system, the procedure for the determination of such an equivalent is not available in literature. Hence, this paper presents a very simple three-phase power system equivalent model, which can be obtained with negligible computational effort from real time measurements, for an unbalanced operating system. The validity of the proposed model is demonstrated through studies for two sample systems.

Sensitivity Analysis and Selection of Check Index of Signal Intersection Simulation Model Based on VISSIM

2019 ◽  
Vol 2 (5) ◽  
Author(s):  
Mengda Zhang ◽  
Chenjing Zhou ◽  
Tian-tian Zhang ◽  
Yan Han
Keyword(s):  
Sensitivity Analysis ◽  
Simulation Model ◽  
Optimal Process ◽  
Parameter Calibration ◽  
Index Set ◽  
The Core ◽  
Core Module ◽  
Simulation Parameter ◽  
Simulation Parameters ◽  
Selection Of

Selecting check index quantitatively is the core of the calibration of micro traffic simulation parameters at signal intersection. Five indexes in the node (intersection) module of VISSIM were selected as the check index set. Twelve simulation parameters in the core module were selected as the simulation parameters set. Optimal process of parameter calibration was proposed and model of the intersection of Huangcun west street and Xinghua street in Beijing was built in VISSIM to verify it. The sensitivity analysis between each check index and simulation parameter in their own set was conducted respectively. Sensitive parameter sets of different check indices were obtained and compared. The results show that different indexes have different size of set, and average vehicle delay's is maximum, so it's necessary to select index quantitatively. The results can provide references for scientific selection of the check indexes and improve the study efficiency of parameter calibration.

Multi-Component Liquid Analyzer During Steady-State and Dynamic CO2 Capture Operations: Near Real-Time Feedback in Industrialized Environment

2019 ◽  
Author(s):  
Chuck Panaccione ◽  
Greg Staab ◽  
Andy Awtry ◽  
Rene Kupfer ◽  
Tyler Silverman ◽  
...  
Keyword(s):  
Steady State ◽  
Real Time ◽  
Co2 Capture

Selection of one-dimensional sedimentation: models for on-line use

1995 ◽  
Vol 31 (2) ◽  
pp. 193-204 ◽  
Author(s):  
Koen Grijspeerdt ◽  
Peter Vanrolleghem ◽  
Willy Verstraete
Keyword(s):  
Steady State ◽  
Selection Criteria ◽  
Data Sets ◽  
Concentration Profiles ◽  
A Posteriori ◽  
One Dimensional ◽  
On Line ◽  
Dynamic Concentration ◽  
Selection Of ◽  
Modelling Task

A comparative study of several recently proposed one-dimensional sedimentation models has been made. This has been achieved by fitting these models to steady-state and dynamic concentration profiles obtained in a down-scaled secondary decanter. The models were evaluated with several a posteriori model selection criteria. Since the purpose of the modelling task is to do on-line simulations, the calculation time was used as one of the selection criteria. Finally, the practical identifiability of the models for the available data sets was also investigated. It could be concluded that the model of Takács et al. (1991) gave the most reliable results.

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