Three-phase decoupling load flow calculation method for weakly meshed distribution network based on sequence component method

Abstract

The invention discloses a three-phase decoupling load flow calculation method for a weakly meshed distribution network based on a sequence component method, comprising the following steps of: (1) carrying out three-phase load flow modeling on the weakly meshed distribution network based on the sequence component method and realizing three-sequence decoupling; and (2) building a three-phase decoupling load flow calculation method for the weakly meshed distribution network based on the step (1), wherein the three-phase decoupling load flow calculation method for the weakly meshed distribution network is a loop analysis method based on roads. Thereof, the algorithm keeps the advantages of a forward-backward sweeping method facing to branches; the convergence of the algorithm is not affected by the loop and the loop has better algorithm. Simultaneously, after adopting the three-sequence decoupling, the node number of the system load flow calculation is reduced; the load flow calculation quantity is reduced; and the calculation efficiency is improved. Finally, the accuracy and better convergence of the method provided by the invention are tested through 6-busbar and 33-busbar tests; the stronger loop processing ability is also tested; and the number of iterations is reduced along with the increased closed loop.

Description

technical field [0001] The invention belongs to the field of power system analysis and calculation, and in particular relates to a three-phase decoupling power flow calculation method of a weak-ring distribution network based on a sequence component method. Background technique [0002] Distribution network power flow calculation is an important content of distribution system analysis, and it is an important basis for quantitative analysis of the rationality, reliability and economy of distribution system planning, design and operation mode. Scholars at home and abroad have proposed various distribution network power flow algorithms according to the characteristics of the distribution network, such as the forward push-back method, the implicit Zbus Gauss method, the loop impedance method, the improved Newton method, and the fast decoupling method. Among them, the forward-backward method makes full use of the structural characteristics of the distribution network, and it has ...

AI Technical Summary

Problems solved by technology

However, the three phases of symmetrical components cannot be decoupled, resulting in a large number of nodes during power flow calculation, a large amount of calculation, and low calculation efficiency

At the same time, there are difficulties in the processing of balance nodes and PV nodes

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