An analysis method for the influence of new energy output on power system network power flow

Abstract

The invention provides an analysis method for an influence of new energy contribution on network power flow of an electric power system and belongs to the field of electric power system analysis. The method comprises the steps of obtaining contribution magnitude of all new energy units and power flow magnitude of various lines of an electric power network in various periods of a year; obtaining a scatter diagram of any line power flow for the new energy contribution in various periods of the year, by taking new energy contribution in a to-be-analyzed electric power system as a horizontal ordinate and line power flow as a vertical coordinate; obtaining an upper bound trend line, a lower bound trend line and slopes of the trend lines of the line power flow for the new energy contribution, under 99% of confidence degree by data fitting; and through analysis, obtaining the influence degree of a new energy contribution change on the line power flow and screening top 10% of lines which are most sensitive to the new energy contribution change. According to the method, through simulation of real operation of the electric power system, an analysis result is more approximate to the real operation condition of the electric power system.

Description

Technical field [0001] The invention relates to the field of power system analysis, in particular to a method for analyzing the influence of new energy output on the power flow of a power system network. Background technique [0002] Power system network power flow refers to the power flow of each line in the power system. Power system network power flow is of vital importance to the safe operation of the power system. Once the power flow of a certain line or multiple lines exceeds the limit, the power system will have tripping, disassembly and other faults, which will seriously affect the power consumption of users and cause A lot of economic losses. As a power system operation controller, one must grasp in advance the possible impact of generator output changes at each node on the network power flow, and understand the sensitivity of each line flow of the power system to generator output changes (sensitivity refers to when the generator output changes by one unit The size of ...

AI Technical Summary

Problems solved by technology

However, with the increasing proportion of wind power, photovoltaic and other new energy installed capacity, the power system is facing more and more uncertain and random problems.

In this case, the shortcomings of this method are reflected in at least three aspects: 1) It is difficult to simulate the actual operation of the power system, that is, it is impossible to consider the response of other power sources when the output of new energy sources changes; 2) It is difficult to consider the space for new energy sources Output characteristics, that is, only the impact of new energy changes in a certain location can be calculated, and the different characteristics of new energy output in different locations in a larger area cannot be considered as a whole; 3) It is difficult to consider the randomness of new energy, and it can only be aimed at the specific operation mode of the system perform deterministic calculations;

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