Distribution network voltage engineering analysis method

Abstract

The invention discloses a distribution network voltage engineering analysis method. The method comprises the following steps: making a rapid calculation table through each line diameter parameter, and realizing rapid calculation of the voltage drop of each segment of line by using the rapid calculation table according to the practical load and installation condition; calculating the voltage regulation capability of a transformer through the no-load voltage ratio parameter of the transformer; analyzing the voltage condition on the secondary side of the transformer by comparing the line voltage drop and the voltage regulation capability of the transformer by using a line transformer voltage drop analysis method. According to the analysis method, the problem of high voltage caused by a distributed power supply and the problem of low voltage under the condition of analyzing the distribution network heavy load can be solved on the basis of a line voltage drop formula in combination with an analysis method summarized according to the practical production condition. As proved by comparison validation of modeling simulation, the method is correct in principle, is feasible, is convenient and rapid to use, can fully meet the engineering requirement on the calculation accuracy, and can be used for rapidly analyzing distribution network voltages of 35kV and below.

Description

technical field [0001] The invention relates to a distribution network voltage engineering analysis method, which belongs to the technical field of electric power distribution network. Background technique [0002] With the use of new technologies and new energy sources, the combination of distributed power generation and large power grids is considered to be the main way to save investment, reduce energy consumption, and improve the reliability and flexibility of the power system. It is the main direction for the development of the power industry in the future. . But distributed power generation is not a brand new concept. Small hydropower, wind power and now photovoltaic power generation are all distributed power generation. They all have the problem of unstable output power and large fluctuations. For example, small hydropower plants are mostly run-of-river hydropower stations with small or no storage capacity, which are greatly affected by river flow and weather conditi...

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Problems solved by technology

[0003] The output power of distributed power generation fluctuates greatly, which causes the voltage to exceed the upper limit when the output power reaches its peak value.

Aiming at this problem, there are many related research documents and materials, but all of these documents and materials use the simulation modeling method. The simulation modeling takes a long time and is complicated to learn. The situation does not have a quantitative analysis conclusion, but it is said that the large installed capacity of the distributed power supply causes the voltage to exceed the upper limit, but the distributed power supply with a large installed capacity will cause the problem of the voltage exceeding the upper limit. has been solved

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