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JEET, Vol. 13, No. 2, March 2018 
Power Flow Algorithm for Weakly Meshed Distribution Network with Distributed Generation Based on Loopanalysis in Different Load Models
Hongsheng Su 
Area 
A  Electric Power Engineering 
Abstract 
As distributed generation (DG) is connected to grid, there is new nodetype occurring in
distribution network. An efficient algorithm is proposed in this paper to calculate power flow for
weakly meshed distribution network with DGs in different load models. The algorithm respectively
establishes mathematical models focusing on the wind power, photovoltaic cell, fuel cell, and gas
turbine, wherein the different DGs are respectively equivalent to PQ, PI, PQ (V) and PV nodetype.
When dealing with PV node, the algorithm adopts reactive power compensation device to correct
power, and the reactive power allocation principle is proposed to determine reactive power initial value
to improve convergence of the algorithm. In addition, when dealing with the weakly meshed network,
the proposed algorithm, which builds path matrix based on loopanalysis and establishes incident
matrix of node voltage and injection current, possesses good convergence and strong ability to process
the loops. The simulation results in IEEE33 and PG&G69 node distribution networks show that with
increase of the number of loops, the algorithm¡¯s iteration times will decrease, and its convergence
performance is stronger. Clearly, it can be effectively used to solve the problem of power flow
calculation for weakly meshed distribution network containing different DGs. 
Keyword 
Distributed Generation (DG),Load flow calculation,Weakly meshed distribution network,Loopanalysis

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