MMC DC voltage outer loop controller and generation method thereof

A DC voltage, DC side voltage technology, applied in the direction of AC power input conversion to DC power output, electrical components, power transmission AC network, etc., can solve the problems of limited application scope, low accuracy, low universality, etc. High model accuracy, high precision effects
CN107453633AActive Publication Date: 2017-12-08HUAZHONG UNIV OF SCI & TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUAZHONG UNIV OF SCI & TECH
Publication Date
2017-12-08

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Abstract

The invention discloses an MMC DC voltage outer loop controller and a generation method thereof. According to the generation method of the controller, the influence of the submodule capacitance voltage dynamics of a modular multilevel converter and the load dynamics on the DC voltage dynamics is considered, a DC side small signal mathematical model is established, a transfer function between the DC side voltage and the active current is derived, and a target DC voltage closed-loop control model is obtained according to the transfer function so that the target DC voltage outer loop controller is obtained from the target DC voltage closed-loop control model. The DC side equivalent capacitance is derived from the angle of the circuit so as to have higher accuracy in comparison with the conventional equivalent lumped capacitance obtained by the energy equivalence principle; meanwhile, different operation state of the converter topology is considered so that the universality is high; besides, the influence of the DC side dynamic behaviors on the controller is considered, including two situations that the DC side is the constant power resistance load and the converter station load so that the range of application is wide.
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Description

technical field

[0001] The invention belongs to the technical field of multilevel power electronic converters, and more specifically relates to an MMC DC voltage outer loop controller and a generating method. Background technique

[0002] The Modular Multilevel Converter (MMC) has the advantages of good output waveform quality, no dynamic and static voltage equalization problems of switching devices, easy expansion, and high system efficiency, and has become the most competitive converter in the flexible DC transmission system. streamer topology.

[0003] Vector control is a control method commonly used in MMC converters. Establishing an accurate mathematical model and deriving the inner and outer loop transfer functions are the prerequisites for controller design. At present, most of the modeling of MMC is concentrated on the AC side (that is, the current inner loop), while the precise modeling of the DC voltage outer loop is less, and more specifically, the transfer funct...

Claims

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