A Comprehensive Evaluation Method on Dynamic Simulation Accuracy of Power System

2014 ◽  
Vol 541-542 ◽  
pp. 869-874
Author(s):  
Hui Ping Zheng ◽  
Min Xue ◽  
Yan Zhao ◽  
Xin Yuan Liu ◽  
Yu Han
Keyword(s):  
Power System ◽  
New England ◽  
Dynamic Simulation ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Accuracy Assessment ◽  
Short Circuit ◽  
Power Grids ◽  
Accuracy Evaluation ◽  
Simulation Accuracy

In order to overcome the shortcomings of the present accuracy assessment methods of power system dynamic simulation, this paper focuses the permanent single phase short-circuit fault which occurs in a large probability in power grids,and selects the typical electrical quantities which is very concerned in engineering after the fault happened. A time-scale based error criteria on simulation validation is proposed, and a comprehensive error criteria according to the average errors between simulation data and actual data is proposed to evaluate objectively the simulation accuracy of the typical electrical quantities. Considering the variation characteristics of the electrical quantities, the simulation accuracy evaluation of a single electrical element is expended to the simulation accuracy evaluation of the entire network, so not only the comprehensive evaluation about the model and its parameters but also the information for model modification and parameter correction can be obtained. The effectiveness of the proposed method is verified by the numerical results on the New England 10 Unit 39 Bus powers system.

scholarly journals Flexibility Evaluation Method of Power Systems with High Proportion Renewable Energy Based on Typical Operation Scenarios

Electronics ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 627
Author(s):  
Xiangying Tang ◽  
Yan Hu ◽  
Zhanpeng Chen ◽  
Guangzeng You
Keyword(s):  
Renewable Energy ◽  
Power Systems ◽  
Power System ◽  
Power Flow ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Supply And Demand ◽  
Flow Distribution ◽  
Occurrence Probability ◽  
Flexible Operation

The development of renewable energy represented by wind, photovoltaic and hydropower has increased the uncertainty of power systems. In order to ensure the flexible operation of power systems with a high proportion of renewable energy, it is necessary to establish a multi-scenario power system flexibility evaluation method. First, this study uses a modified k-means algorithm to cluster operating scenarios of renewable energy and load to obtain several typical scenarios. Then, flexibility evaluation indices are proposed from three perspectives, including supply and demand balance of the zone, power flow distribution of the zone and transmission capacity between zones. Next, to calculate the flexibility evaluation indices of each scenario—and according to the occurrence probability of each scenario—we multiplied the indices of each scenario by the scenario occurrence probability to obtain comprehensive evaluation indices of all scenarios. Based on the actual historical output data of renewable energy and load of a southern power system in China, a flexibility evaluation was performed on the modified IEEE 14 system and modified IEEE 39 system. The results show that the proposed clustering method and flexibility indices can effectively reflect the flexibility status of the power system.

Power Quality Simulation and Assessment System Based on ADPSS

2013 ◽  
Vol 341-342 ◽  
pp. 1367-1373
Author(s):  
Bo Zhang ◽  
Shuang Yin Dai ◽  
Yan Ping Qin
Keyword(s):  
Power System ◽  
Power Quality ◽  
Large Scale ◽  
Short Circuit ◽  
Hybrid Simulation ◽  
Assessment System ◽  
Quality Analysis ◽  
Simulation Accuracy ◽  
Simulation Based ◽  
Power Quality Analysis

A power quality analysis method based on electromechanical-electromagnetic hybrid simulation is proposed. The hybrid simulation for power quality analysis can not only enhance the simulation accuracy, and can realize power quality simulation of large scale power system. Then power quality simulation and assessment system is developed based on ADPSS. The system provides plenty of power quality models and achieves power quality simulation based on electromechanical-electromagnetic hybrid simulation. It will provide guidance and reference for power quality study. The hybrid simulation model of an actual large scale power system is built and voltage sag problems caused by short circuit tests are simulated based on the developed system. Simulation result shows the practicality and effectiveness of power quality simulation and assessment system.

Time-SEP Comprehensive Assessment of Methods for Calculating Positioning Accuracy of Navigation Systems

2013 ◽  
Vol 765-767 ◽  
pp. 2026-2030 ◽  
Author(s):  
Rui Jiang ◽  
Yan Yong Wang ◽  
Gong Liu Yang ◽  
Yong Miao Wang
Keyword(s):  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Statistical Testing ◽  
Accuracy Evaluation ◽  
Maximum Relative Error ◽  
Navigation Systems ◽  
Initial Value ◽  
Positioning Accuracy ◽  
True Value ◽  
Navigation Equipment

Based on 2 statistical testing schemes, the accuracy evaluation method of Time-SEP was proposed; 3 sphere error probability (SEP) methods were derivate and concluded. Simulation and experimental verification show that: Time-SEP method for navigation equipment positioning accuracy can give a relatively comprehensive evaluation; the scheme is feasible, compatible with the traditional calculation method of parameters and can fully utilize the single test data, test validation simple. 3 algorithms can all be used to calculate SEP, the maximum relative error is less than 5%; the χ2 distribution approximation somewhat conservative is recommended; and MLE values can be used as the initial value of integral operation, to reduce the number of integral operation, access to the true value rapidly.

Identification of the Maximum Wind Penetration Level during Over-Frequency Disturbances

2013 ◽  
Vol 805-806 ◽  
pp. 364-369
Author(s):  
Yong Gang Zhang ◽  
Ming Yang Sun ◽  
Xian Feng Xu ◽  
Wei Jin Zhuang
Keyword(s):  
Power Systems ◽  
Power System ◽  
Wind Power ◽  
Short Circuit ◽  
Simulation Accuracy ◽  
Maximum Wind ◽  
Wind Generators ◽  
Load Demand ◽  
High Level ◽  
The Impact

Todays power system is integrating increasingly variable and uncertain generation resources, especially wind power. As much of wind generators in the market contribute little or none to system inertia, power system is operated much closer to its dynamic security margin. To identify the maximum wind penetration of a power system following a pre-defined disturbance, the impact of increased wind penetration on post-disturbance stability is studied. In this paper, the disturbance is simulated by a short circuit that leads to the sudden disconnection of a large amount of load demand. When wind power covers a small portion of system demand, the post-disturbance frequency is not much affected by grid-connected wind generators. But when wind penetration is increased to a comparative high level, power system loses stability in the form of undamped frequency oscillation. Simulation results show that, in the occurrence of system disturbances, 60% feed-in wind penetration will make the power system loses stability. Anyway, taking into consideration of simulation accuracy, severity of disturbances and diversity of power systems, 60% must not be a precise result, it could just be used as a reference when analyzing other grids.

scholarly journals Stacked-GRU Based Power System Transient Stability Assessment Method

Algorithms ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 121 ◽  
Author(s):  
Feilai Pan ◽  
Jun Li ◽  
Bendong Tan ◽  
Ciling Zeng ◽  
Xinfan Jiang ◽  
...  
Keyword(s):  
Power System ◽  
New England ◽  
Transient Stability ◽  
Time Series Data ◽  
Assessment Method ◽  
Complex Model ◽  
Power Grids ◽  
Series Data ◽  
Stability Assessment ◽  
Large Power

With the interconnection between large power grids, the issue of security and stability has become increasingly prominent. At present, data-driven power system adaptive transient stability assessment methods have achieved excellent performances by balancing speed and accuracy, but the complicated construction and parameters are difficult to obtain. This paper proposes a stacked-GRU (Gated Recurrent Unit)-based transient stability intelligent assessment method, which builds a stacked-GRU model based on time-dependent parameter sharing and spatial stacking. By using the time series data after power system failure, the offline training is performed to obtain the optimal parameters of stacked-GRU. When the application is online, it is assessed by framework of confidence. Basing on New England power system, the performance of proposed adaptive transient stability assessment method is investigated. Simulation results show that the proposed model realizes reliable and accurate assessment of transient stability and it has the advantages of short assessment time with less complex model structure to leave time for emergency control.

scholarly journals The Use of Black-Box Optimization Method for Determination of the Bus Connection Capacity in Electric Power Grid

Energies ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 41
Author(s):  
Andrzej Wędzik ◽  
Tomasz Siewierski ◽  
Michał Szypowski
Keyword(s):  
Power System ◽  
Short Circuit ◽  
Power Grid ◽  
Optimization Method ◽  
Black Box ◽  
Power Grids ◽  
Good Convergence ◽  
Electric Power Grid ◽  
New Energy ◽  
System Calculation

One of the main tasks of the Power System Operators is to ensure a proper, safe, and trouble-free operation and development of power grids. Growth of power system is inseparably linked to a connection of both renewable and classical new energy sources. For network operators and potential investors, it is essential to know the place and volume of generation capacity that can be connected to the grid. A publication of such data is currently a legal obligation for many operators. This paper proposes a method of determining the bus connection capacity in power grid of any type with the use of black-box optimization. Calculations and analyses were performed with a full, nonlinear model of the analyzed network. Obtained results show the effectiveness of this method for both single and multiple nodes in any configuration. All the constraints relevant for the proper and safe system operation, such as bus voltages, line loads, and short-circuit currents, both in a steady-state and (n-1) contingency states, are taken into consideration. Calculations confirmed the good convergence and repeatability of the method for all three tested computational algorithms. This has also confirmed the possibility of use of open source software to extend the functionality of Siemens PSS®E commercial power system calculation software.

Comprehensive TCEP Assessment of Methods for Calculating MUAV Navigation Position Accuracy Based on Visual Measurement

2013 ◽  
Vol 765-767 ◽  
pp. 2224-2228 ◽  
Author(s):  
Yan Yong Wang ◽  
Gong Liu Yang ◽  
Xing Rong Jia ◽  
Yong Miao Wang
Keyword(s):  
Navigation System ◽  
Evaluation Method ◽  
Accuracy Assessment ◽  
Visual Navigation ◽  
Accuracy Evaluation ◽  
Single Trial ◽  
Positioning Accuracy ◽  
Visual Measurement ◽  
Position Accuracy ◽  
Relationship Of

in order to satisfy the positioning accuracy identification requirement of MUAV navigation system, the characteristics of visual navigation were analyzed, the existing navigation system accuracy assessment methods were summarized and the conversion relationship of each index were deduced. According to the Ethridge statistical algorithm for calculating circular error probability (CEP), navigation and positioning accuracy assessment scheme were designed. Finally, the time-CEP(TCEP) accuracy evaluation method based on visual measurement was put forward, which were verified by simulation using four group actual INS data .The results show that: the scheme is feasible, convenient and practical; the method can relatively comprehensive evaluate the positioning accuracy of navigation system and can make full use of the single trial data.

Bayesian Algorithm Based on Airborne Power Supply System

2014 ◽  
Vol 492 ◽  
pp. 31-36
Author(s):  
Xu Jiang ◽  
Jing Yu Hua
Keyword(s):  
Power System ◽  
Evaluation System ◽  
Evaluation Method ◽  
Low Voltage ◽  
Comprehensive Evaluation ◽  
Objective Assessment ◽  
Analysis Data ◽  
Design Assessment ◽  
The Status ◽  
State Of Power

The design assessment of airborne power system can be started from designing stage of the power system. It can analyse and evaluate the status of the power system. The key to the designation of evaluation system is how to evaluate the performance of the power system. With airborne power system as the research object, combined with military standard GJB181A - 2003,and through the onboard power system for co-test, it can establish a set of objective assessment strategies and methods can achieve comprehensive evaluation on the performance of airborne state of power system. Based on bayesian theory evaluation method. With 28 v low voltage dc onboard power system as an example, intercepting the multiple sets of test and analysis data to evaluate instances test and comparative analysis of the model, a comprehensive evaluation and the rationality of the evaluation result is verified by relevant experimental data.

scholarly journals Determination of Optimal Opening Scheme for Electromagnetic Loop Networks Based on Fuzzy Analytic Hierarchy Process

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Yang Li ◽  
Yahui Li ◽  
Zijiao Han ◽  
Guoqing Li ◽  
Kai Gao ◽  
...  
Keyword(s):  
Analytic Hierarchy Process ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Evaluation Model ◽  
Fuzzy Comprehensive Evaluation ◽  
Power Grids ◽  
Fuzzy Analytic Hierarchy Process ◽  
Liaoning Province ◽  
Analytic Hierarchy ◽  
Hierarchy Process

Studying optimization and decision for opening electromagnetic loop networks plays an important role in planning and operation of power grids. First, the basic principle of fuzzy analytic hierarchy process (FAHP) is introduced, and then an improved FAHP-based scheme evaluation method is proposed for decoupling electromagnetic loop networks based on a set of indicators reflecting the performance of the candidate schemes. The proposed method combines the advantages of analytic hierarchy process (AHP) and fuzzy comprehensive evaluation. On the one hand, AHP effectively combines qualitative and quantitative analysis to ensure the rationality of the evaluation model; on the other hand, the judgment matrix and qualitative indicators are expressed with trapezoidal fuzzy numbers to make decision-making more realistic. The effectiveness of the proposed method is validated by the application results on the real power system of Liaoning province of China.

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