Continuous Power Flow of Islanded Microgrids Based on Factored Load Flow and Step Size Control

Voltage stability of power grid would be affected greatly by the connection of large-scale wind farms. Conventional continuous power flow method can not accurately simulate the system’s operation when wind farms are connected to power gird. A new continuous power flow method is proposed, considering auto-disconnection of large-scale wind farms. The step-size control segment is improved in this algorithm in order to simulate the operation characteristics of wind farm and determine the precise time when a certain wind farm is cut off.

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A step size control scheme based on polynomial regression for continuation power flow calculation

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/371/5/052018 ◽

2019 ◽

Vol 371 ◽

pp. 052018 ◽

Cited By ~ 1

Author(s):

Hua Sun ◽

Quan Chen ◽

Xiaoming Dong

Keyword(s):

Power Flow ◽

Polynomial Regression ◽

Size Control ◽

Step Size ◽

Power Flow Calculation ◽

Flow Calculation ◽

Continuation Power Flow ◽

Step Size Control ◽

Control Scheme

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A Parameterization Technique for the Continuation Power Flow Developed from the Analysis of Power Flow Curves

Mathematical Problems in Engineering ◽

10.1155/2012/762371 ◽

2012 ◽

Vol 2012 ◽

pp. 1-24 ◽

Cited By ~ 3

Author(s):

Elisabete de Mello Magalhães ◽

Alfredo Bonini Neto ◽

Dilson Amancio Alves

Keyword(s):

Power Systems ◽

Power Flow ◽

Jacobian Matrix ◽

Size Control ◽

Load Flow ◽

Step Size ◽

Real Power ◽

Continuation Power Flow ◽

Large Systems ◽

Ill Conditioning

This paper presents an efficient geometric parameterization technique for the continuation power flow. It was developed from the observation of the geometrical behavior of load flow solutions. The parameterization technique eliminates the singularity of load flow Jacobian matrix and therefore all the consequent problems of ill-conditioning. This is obtained by adding equations lines passing through the points in the plane determined by the loading factor and the total real power losses that is rewritten as a function of the real power generated by the slack bus. An automatic step size control is also provided, which is used when it is necessary. Thus, the resulting method enables the complete tracing ofP-Vcurves and the computation of maximum loading point of any electric power systems. Intending to reduce the CPU time, the effectiveness caused by updating the Jacobian matrix is investigated only when the system undergoes a significant change. Moreover, the tangent and trivial predictors are compared with each other. The robustness and simplicity as well as the simple interpretation of the proposed technique are the highlights of this method. The results obtained for the IEEE 300-bus system and for real large systems show the effectiveness of the proposed method.

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