Method for analysis of available power supply capacity of medium voltage distribution network

Abstract

The invention, belonging to the field of calculating index of distribution network, the power supply capacity, in planning distribution system, relates to a method for the analysis of available power supply capacity of a medium voltage distribution network, comprising the steps: establishing an available power supply capacity mode; analyzing the communication relationship between main transformers in research area to form a main transformer communication relationship matrix Llink; according to the differences of in-station communication and inter-station communication, partitioning the matrix Llink and correcting the main transformer communication relationship matrix Llink; defining the elements of a capacity matrix R to represent main transformer capacity of corresponding communication center and correcting matrix R; calculating the available power supply capacity of the system; positioning weak points; and acquiring critical capacity. In the method for the analysis of available power supply capacity of the medium voltage distribution network according to the invention, the available power supply capacity calculation mode and the calculation analysis method are put forward, and on the basis of the available power supply capacity, the analysis method is put forward, in which the weak points in grid, which restrict the available power supply capacity, are rapidly positioned by channel-transferring bottleneck matrix, and the minimal element capacity required by communication line is obtained via the critical capacity.

Description

technical field [0001] The invention belongs to the field of power supply capability calculation of distribution network indicators in power distribution system planning, and relates to a method for analyzing the available power supply capability of a medium-voltage distribution network. Background technique [0002] The urban power distribution system is an important infrastructure and a necessary energy supply system for urban modernization. For a long time, the power grids in many cities in my country have suffered from insufficient power supply capacity, uncertain network transfer capabilities, low utilization of power grid equipment, unbalanced loads, and large losses. As demand for electricity continues to increase, so does the need for continuous expansion of the grid. In order to adapt to the rapid economic development and the rising power load, make the distribution network construction adapt to the development of the main network, and avoid repeated construction a...

AI Technical Summary

Problems solved by technology

At this stage, while examining the substation’s substation capacity, the feeder capacity is also used as the basis for the calculation of the power supply capacity of the grid, which is more practical, and the idea of ​​​​calculating the network transfer power supply capacity is proposed, but only the feeder load is used to estimate the network transfer power supply capacity. It is unreasonable because it ignores the influence of the actual structure of the network on the power supply capacity, and the calculation results are quite different from the actual ones; third, the power supply capacity calculation stage based on the N-1 safety criterion and the topological interconnection of substations, for example, based on the main transformer interconnection method, linear programming method, the most representative of which is the calculation method of power supply capacity based on the interconnection of main transformers, see the invention patent application "A Method for Evaluating Power Supply Capacity of Power Distribution System Considering the "N-1" Criterion (Patent Application No. 200810151314.6)"

The calculation model of distribution network power supply capacity proposed by the method at this stage can calculate the calculation method of power supply capacity of distribution network and network transfer under the condition of N-1. This calculation method is simple and practical, but the assumed conditions are too ideal , if the capacity of the transfer channel is infinite

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