Allocation method of shunt capacitors in power grid based on voltage sag evaluation index

Abstract

The invention discloses a power grid parallel capacitor configuration method based on a voltage sag assessment index. The method comprises the following steps of (1) acquiring power grid selectable parallel capacitor configuration schemes; (2) judging feasibility, and screening feasible parallel capacitor configuration schemes; (3) judging power grid transmission loss, and screening a low-transmission-loss parallel capacitor configuration scheme; (4) judging a voltage sag influence: 401, calculating the power grid voltage sag assessment index; 402, determining a low voltage sag influence configuration scheme; (5) judging input cost: 501, calculating the input cost; 502, determining an optimal parallel capacitor configuration scheme. The method provided by the invention is simple in step, reasonable in design, and convenient to implement, and has a good use effect, not only is the transmission loss reduced, but also voltage sag is effectively relieved, the economical efficiency of power grid parallel capacitor configuration is also considered, safe operation and economic operation of a power grid can be realized, and the popularization and application value is high.

Description

technical field [0001] The invention belongs to the technical field of power grid optimization operation, in particular to a method for configuring parallel capacitors in a power grid based on a voltage sag evaluation index. Background technique [0002] With the advancement of science and technology, the rapid development of the national economy and the continuous improvement of people's living standards, people's demand for and dependence on electricity has become stronger and stronger. It has been widely used in industrial loads, and various sensitive loads account for an increasing proportion of industrial loads. Sensitive loads are very sensitive to power grid disturbances such as voltage sags, voltage swells and short-term interruptions. Sensitive users have higher requirements for reliable and safe operation of the power grid. Come higher. Therefore, the analysis, evaluation and management of voltage sag is of great practical significance. [0003] At present, the e...

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Problems solved by technology

[0005] The traditional shunt capacitor configuration does not consider the grid voltage sag. Since the proportion of sensitive loads in industrial loads in modern production is increasing, the problem of voltage sag is becoming more and more serious. It is necessary to consider how to configure shunt capacitors. Alleviating the voltage sag of the power grid, how to reduce the harm caused by the voltage sag to sensitive loads, how to choose the appropriate installation location and capacity of shunt capacitors in the grid planning, and realizing the economical optimal configuration of capacitors is the key to realizing the safe and economical operation of the power grid important premise

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