Microgrid power distribution system and power flow asymmetrical fault analysis method therefor

摘要

A fault analysis method includes: using a matrix of two sets of microgrid power distribution networks to analyze and solve a fault current, and for various types of faults of the distributed power distribution system, obtaining appropriate boundary conditions to calculate a variety of different types of single or simultaneous fault currents of load points. The present invention may be further applied to a situation where a bus or impedance or parallel loop is added. The present invention has good robustness and execution speed, and requires small memory space for calculation of analysis and identification of a power flow fault of the distributed power distribution system, and may be actually applied to an instrument control system for identification and analysis of a fault of a large-scalemicrogrid distribution system.

主权项

1. A microgrid distribution (MGD) system, comprising:
a smart apparatus, having a programmable device for executing a fault analysis method for a three-phase and single-phase mixed power distribution system by selecting at least one of single line-to-ground (SLG) fault analysis, double line-to-ground (DLG) fault analysis, open-conductor fault analysis, line-to-line (LL) fault analysis, and microturbine generation (MTG) fault analysis to solve a fault current, and for various types of faults of the microgrid distribution system, and obtaining appropriate boundary conditions to calculate a variety of different types of single or simultaneous fault currents of load points; and a plurality of buses, at least one of which is connected to the smart apparatus; wherein the programmable device executing the SLG, DLG, LL, open-conductor fault analysis, and MTG fault analysis method by using main relation matrix ZMGD; and wherein the main relation matrix ZMGD=ZV-BC BI in which ZV-BC is a first relation matrix while BI is a second relation matrix between a bus injection current and a branch current, and the relation matrix between the bus injection current [I] and the branch current [B] is denoted as [B]=[BI][I], and the matrix BI is an upper triangular matrix only comprising values of 0 and 1.