Comprehensive Harmonic Control Method for Local Power Grid Based on Least Squares Method

Abstract

The invention provides a local area power grid harmonic comprehensive treatment method based on a least square method. Compensating current of APFs is used as an unknown quantity, based on a topologystructure, line resistance information and normal loading information of a power grid, a matrix relationship between the APF compensating current and harmonic voltage of points is built, a matrix least square method is adopted for resolving APF optimal compensating current, when the APFs run on line, according to the APF optimal compensating current, output corresponding current is controlled, andcomprehensive treatment is conducted on the local area power grid harmonic voltage. According to the treatment method, the APF capacity is used scientifically, and through the small amount of APFs, the overall harmonic level is made to be optimal; moreover, the method is based on current compensation, so that the method has high response speed, the similarity of a control structure is taken intoaccount, the degree of difficulty of adjusting a local load compensation control structure to a generalized optimal current compensation control structure at an engineering level is relatively low, due to the fact that a complex process of conducting modeling on a harmonic source is omitted, the real-time performance of the local area power grid harmonic comprehensive treatment method based on theleast square method is good, and the local area power grid harmonic comprehensive treatment method based on the least square method can cope with complex and changeable situations of power grids in practical engineering, and has large engineering significance.

Description

technical field [0001] The invention belongs to the field of power quality optimization of power grids, and relates to a control method of how to use a parallel type active power filter to quickly control the harmonics of the power grid so as to minimize the harmonic content of the whole local power grid. Background technique [0002] With the development of power electronics technology in recent years, more and more power electronic devices such as rectifiers, inverters and DC-DC converters have been widely used in power grids because of their ability to efficiently and conveniently convert electrical energy. . However, due to the nonlinear characteristics of power electronic devices, the investment of power electronic devices inevitably generates a large number of harmonic problems in the power grid that cannot be ignored, and degrades the power quality of the power grid. [0003] In order to solve such problems, various power quality management equipments emerge as the t...

AI Technical Summary

Problems solved by technology

On the one hand, it is not economical. On the other hand, if only some of the problem loads have been treated, when the installation location and compensation load selection are unreasonable, the overall power quality of the grid cannot be guaranteed to be optimized. Causes power quality to deteriorate compared to before treatment

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