Cooperative control method of power electronic system

Abstract

The invention discloses a cooperative control method of a power electronic system. A large current limit inductor is connected with a primary side of a coupling transformer of a series active power filter in parallel; and by utilizing the cooperative control method, the series active power filter compensates harmonic voltage during regular operation, a series active power filter main circuit stops running when a loading side generates a fault of short circuit, a secondary side of the coupling transformer is of high impedance, so that current limit is realized by utilizing the parallel current limit inductor. The power electronic system not only has harmonic voltage compensating functions of the series active power filter, but also has a current limit function so as to effectively improve the power supply reliability and the power quality of a power grid, and also has remarkable economic benefit and environment-friendly benefit. The cooperative control method disclosed by the invention solves various power quality problems in the power grid, and provides theoretical and technical bases for effectively solving short circuit current limit and power quality problems of the power grid.

Description

technical field [0001] The invention relates to a power electronic system, in particular to a method for collaborative control of a power electronic system. Background technique [0002] In recent years, the scale of my country's power grid has expanded rapidly. The continuous expansion of the scale of the power grid and the increasingly complex structure will inevitably cause the continuous increase of the short-circuit current level of the power system. will lead to serious consequences. Therefore, it is meaningful to take practical and effective current-limiting measures to limit the short-circuit current to a reasonable level. After years of research and development, many special fault current limiters have emerged, especially superconducting current limiters and solid-state current limiters have been used in some demonstration projects, which greatly promotes the in-depth research of current limiting technology and practical process. [0003] Such as figure 1 Shown i...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a coordinated control method for power electronic systems in view of the deficiencies of the existing technologies, to break through the current situation of no-load operation of traditional solid-state current limiters in normal operation of the power grid, to make full use of switching devices, and at the same time solve the problem of Short-circuit current limitation and power quality problems of harmonic suppression, reducing loss and saving energy

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