Method for selecting low-voltage reactive compensation capacity

Abstract

The present invention relates to a method for selecting a low-voltage reactive compensation capacity, and the method includes the steps as follows: 1) collecting correlation technical data for a user to install a transformer capacity and a user load report, and collecting power quality background evaluation data of a power supply side and correlation technique data of a power grid; 2) designing the compensation capacity according to collected maximum and minimum system short circuit capacities, an impedance ratio, a nominal voltage, and a correlation budget of the user transformer capacity; 3) and calculating whether a power grid harmonics enlargement exists or not under the capacity based on the designed compensation capacity, and processing with classification according to three conditions. The method avoids the capacity selecting according to the single data regulated by a design discipline and no comprehensive consideration with an actual compensation requirement of the compensated system, and thereby according with the actual requirement and compensating according to the system compensation requirement really.

Description

technical field [0001] The invention belongs to the technical field of low-voltage distribution networks, in particular to a method for selecting the capacity of low-voltage reactive power compensation equipment. Background technique [0002] For the selection of reactive power of the distribution network and the size of the selected capacity, the design department usually follows the routine to determine the capacitance compensation capacity of the low-voltage (0.4kV) side, basically using the main transformer capacity of 10-30%, and part of the distribution line end, According to the main transformer capacity 40% ~ 45%, as the selection principle of reactive power compensation capacity. Basically, based on the power quality background assessment report on the power supply side, and converted to the parameters of the low-voltage side (0.4KV), the short-circuit capacity of the low-voltage side was calculated at the same time; and the report of the user's main electrical equi...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for selecting the capacity of low-voltage reactive power compensation equipment, which is used to solve the problem of simply multiplying the capacity of the distribution transformer by the corresponding The selection of coefficients leads to inappropriate selection of reactive power compensation capacity, which affects the normality of reactive power compensation equipment and rationalizes the selection of reactive power compensation equipment capacity for low-voltage distribution networks

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