Three-phase load flow calculation method of weak looped distribution network comprising multi-type distributed power sources

Abstract

The invention discloses a three-phase load flow calculation method of a weak looped distribution network comprising multi-type distributed power sources. Firstly, the effective three-phase load flow calculation method of a weak looped distribution network is put forward in a distribution sequencing network based on a sequence component calculation method and in combination with characteristics of the weak looped distribution network and a loop analysis of a road. Secondly, detailed formula derivation of iterative computation of distributed generation (DG) of a PQ node type, a PQ (V) node type, an OV node type and a PI node type is conducted and the easy formula is introduced into the load flow calculation method. The three-phase load flow calculation method of the weak looped distribution network comprising the multi-type distributed power sources can effectively process multi-type DG and the weak looped distribution network and is distinct in calculation procedure, simple in programming, and easy to achieve. In addition, the three-phase load flow calculation method of the weak looped distribution network comprising the multi-type distributed power sources retains strong points of rapid calculation and stable convergence of a forward-back substitution method catering to branch circuits. Finally, effectiveness and good convergence of the three-phase load flow calculation method of the weak looped distribution network comprising the multi-type distributed power sources is tested and verified by means of a IEEE (institute of electrical and electronic engineers)-37 generatrix test calculation case, and the three-phase load flow calculation method of the weak looped distribution network comprising the multi-type distributed power sources has good ability of processing the multi-type DG and the looped network.

Description

technical field [0001] The invention relates to a three-phase power flow calculation method for a weak-ring distribution network with multi-type distributed power sources, and belongs to the technical field of power system analysis and calculation. 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. On the one hand, the distribution network is generally ring-shaped and operates in an open loop. However, when the distribution network is reconfigured and optimized, it is necessary to calculate the three-phase power flow of the weak-ring distribution network during closed-loop operation; on the other hand, with the distribution With the rapid development of conventional power generation technology, more and more distributed generation (DG) are ...

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: In view of the fact that the existing three-phase power flow calculation method of distribution network cannot be applied to the three-phase power flow calculation of three-phase unbalanced weak ring distribution network containing multi-type distributed power sources, the present invention proposes a multi-type distributed power flow calculation method. Three-phase Power Flow Calculation Method for Weak Ring Distribution Network of Power Supply

Images