Another Method for the Polar Coordinates Newton Raphson Power Flow Calculation

2014 ◽  
Vol 701-702 ◽  
pp. 227-230
Author(s):  
Yue Hua Huang ◽  
Bing Sen Xu ◽  
Yu Huan Jiang ◽  
Yan Zou
Keyword(s):  
Power System ◽  
Power Flow ◽  
Jacobian Matrix ◽  
Polar Coordinates ◽  
Operating Characteristics ◽  
Power Flow Calculation ◽  
Flow Calculation ◽  
System Flow ◽  
Newton Raphson ◽  
System Operating

With the development of the society, the power system flow calculation becomes more important. Another new method for the polar coordinates Newton Raphson power flow calculation was proposed according to the power system operating characteristics. This research eliminated the vacant of the Jacobian matrix completely, reduced the amount of computer memory requirements greatly and also canceled the inversion completely.

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.

scholarly journals Power Flow Calculation Methods for Power Systems with Novel Structure UPFC

2020 ◽  
Vol 10 (15) ◽  
pp. 5121
Author(s):  
Jian Yang ◽  
Zheng Xu
Keyword(s):  
Power Flow ◽  
Jacobian Matrix ◽  
General Structure ◽  
Equivalent Model ◽  
Unified Power Flow Controller ◽  
Calculation Methods ◽  
Power Flow Calculation ◽  
Flow Calculation ◽  
Novel Structure ◽  
The Impact

Latest unified power flow controller (UPFC) projects adopt novel device structures to meet the requirements of practical applications. Developing power flow calculation methods for these new UPFC structures is of great significance for the design and operation of related projects. To address this issue, this paper deduces an equivalent model of the general structure UPFC, and presents the modified power mismatch equations and Jacobian matrix of the system. Then, three power flow calculation methods suitable for the novel structure UPFC are proposed based on the Newton–Raphson algorithm. The main difference between the three methods is the processing method of UPFC equivalent power injections and the Jacobian matrix. The characteristics of these methods are compared by case studies. Results demonstrate the effectiveness of the three methods for different UPFC structures, and it is found that the improved method, which considers the impact of the Jacobian matrix modifications in UPFC equivalent power injections, can realize power flow calculation in existing calculation programs, and improve the convergence characteristics.

An Application of Improved Newton-Ralph Method in Microgrid Power Flow Calculation

2014 ◽  
Vol 1049-1050 ◽  
pp. 1448-1453
Author(s):  
Han Ping Zhang
Keyword(s):  
Distributed Generation ◽  
Calculation Method ◽  
Power Loss ◽  
Power Flow ◽  
Calculation Model ◽  
Power Flow Calculation ◽  
Flow Calculation ◽  
Newton Raphson ◽  
Simulation Results ◽  
Unified Method

The traditional methods of power flow calculation are no longer applicable for microgrid for the reason that there are many kinds of DG(distributed generation) in it, the mathematical models of these DGs are different from traditional generations. An unified method is proposed to improve Newton-Raphson power flow calculation method for the bus types of PQ(V) and PI after analyzing and establishing power flow calculation model for each kind of DG. It is proved that this method is correct by comparing the results with the simulation results of DigSILENT. The influences on voltage and power loss in microggirds brought by DGs are studied at last.

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