Method for Computing Power Flow of Distribution Network with Distributed Generation Based on Improved Initial Value Choice

Abstract:

In order to compute and analyze power flow of a distribution network with distributed generations(DGs) and eliminate various problems caused by placing of the DGs, several improved Newton methods were proposed successively, and initial value choice is one of the non negligible issues. The traditional initial value choice method also cannot ensure convergence under some circum stances, and the convergence problem is aggravated by the placing of the DGs. For the convergence problem in the computation for the distribution network with vast DGs accessed by the Newton method, this article proposes an approximation algorithm based on series expansion for computing voltage approximation as the computed initial value of power flow so as to improve algorithm convergence. Furthermore, effects of the number of the DGs, node types, their locations, etc. on error between the voltage approximation and the exact voltage value are analyzed through examples. Example verification shows that the error between the voltage approximation computed by the method described in this article and the obtained final value through calculation is small, and replacing the traditional initial value with the voltage approximation can effectively improve convergence of the power flow computation and reduce iterations.

• Periodical: Applied Mechanics and Materials (Volumes 291-294)
• Pages: 2193-2203
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.291-294.2193
• Online since: February 2013
• Authors: Ying Ying Sun, Wei Pei, Li Kong
• Keywords: Distributed Generation (DG), Distribution Network, Initial Value, Newton-Raphson Method

References

[1] Shivkumar Iyer, Arindam Ghosh, Power flow control in a distribution system through an inverter interfaced distributed generator[C], Power EngineeringSociety General Meeting, 2006: 7 p.9.

DOI: 10.1109/pes.2006.1708966

[2] A. Abur, H. Singh, H. Liu, ect. Three phase power flow for distribution systems with dispersed generation[C]. 14th PSCC, Sevilla, 2002, Session 11, Paper 31-7.

[3] Shiqiong Tong, Karen Nan Miu. A network-based distributed slack bus model f DGs in unbalanced power flow studies [J]. IEEE Transaction on Power System 2005, 20(2), 835-842.

DOI: 10.1109/tpwrs.2005.846056

[4] Gross G , Luini J F. Effective Control of Verge on Improvement of Load Flow [J]. PICA, (1975).

[5] Leonidoplos G Fast Linear Method and Conver Improvement of load flow solution [J] Metjpds Electirc Power System 1989, 16.

[6] ZHU Y，TOMSOVIC K．Adaptive Power Flow Method for Distribution Systems with Dispersed Generation．IEEE Trans on Power Delivery。2002，1 7(3)：822— 827.

DOI: 10.1109/tpwrd.2002.1022810

[7] LOSI A，RUSSO M．Object-oriented Load Flow for Radial and Weakly Meshed Distribution Networks．IEEE Trans on Power Systems．2003，18(4)：1265— 1274.

DOI: 10.1109/tpwrs.2003.818600

[8] CHEN T H，CHEN M S，HWANG K J et a1．Distribution System Power Flow Analysis— — A Rigid Approach． IEEE Trans on Power Delivery，1991，6(3)：l146一l152.

[9] LUO G X，SEMLYEN A．Efficient Load Flow for Large Weakly Meshed Networks． IEEE Trans on Power Systems， 199O，5(4)：13O9— 1316.

DOI: 10.1109/59.99382

[10] ZHU Y，TOMSOVIC K．Adaptive Power Flow Method for Distribution System s with Dispersed Generation．IEEE Trans on Power Delivery。2002，1 7(3)：822— 827.

DOI: 10.1109/tpwrd.2002.1022810

[11] Luo G．X，Semlyen A． Effcient Load Flow for Large Weakly Meshed Networks[J]．IEEE Transactions on Power Systems，1990，5(4)：1309-1316.

DOI: 10.1109/59.99382

[12] Shirmohammadi D，Hong H．W，Semlyen A．A Compensation based Power Flow Method for Weakly Meshed Distribution and Transmission Networks[J]．IEEE Transactions on Power Systems，1988，3(2)：753—762.

DOI: 10.1109/59.192932