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STATCOM (static compensator) control method based on switching system theory

A technology of switching system and control method, which is applied in the field of STATCOM control based on switching system theory, can solve problems such as increased cost, difficulty in phase-separation control, and complex system.

Inactive Publication Date: 2011-02-16
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

Although this structure is very effective, it not only increases the cost, but also makes the system more complex because of the need for a specially designed zigzag transformer, and the complex electromagnetic coupling between the phases also makes it difficult to control the phase separation when it is asymmetrical.

Method used

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  • STATCOM (static compensator) control method based on switching system theory
  • STATCOM (static compensator) control method based on switching system theory
  • STATCOM (static compensator) control method based on switching system theory

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Embodiment 1

[0082] Embodiment 1: a kind of STATCOM control method based on switching system theory, this method comprises the following steps:

[0083] Step A: Analyze the main circuit topology of the STATCOM device, and determine the mathematical model of the stand-alone-infinite system including STATCOM.

[0084] Step B: Determine the third-order model of the generator in the system and the state equation and output equation of the STATCOM power system.

[0085] Step C: Linearize STATCOM's nonlinear model.

[0086] Step D: Determine the H of STATCOM ∞ The mathematical model of the robust controller and the design steps of the robust controller for generator excitation.

[0087] Step E: Determine the structure of the entire control system of the DSP-based STATCOM (see figure 1 )composition.

[0088] The mathematical model of the stand-alone-infinite system of STATCOM mentioned in the appeal is:

[0089] δ . ...

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Abstract

The invention provides a STATCOM (static compensator) control method based on a switching system theory, which comprises the following steps of: analyzing a main circuit topological structure of an STATCOM device, and determining a mathematical model of a singe unit-infinite system comprising a STATCOM, determining a three-order model of a generator in the singe unit-infinite system comprising the STATCOM, and a state equation and an output equation of an electric power system comprising the STATCOM; linearizing a nonlinear model of the STATCOM; determining the design steps of an H infinity robust controller mathematical model of the STATCOM and a generator excitation robust controller; and determining the structural composition of the whole system of the STATCOM based on a DSP (Digital Signal Processor). A controller designed according to the method of the invention can ensure that the system is stabilized on one hand when the system fails, and can eliminate the influence of the interference on the performance of the system on the other hand.

Description

【Technical field】: [0001] The invention belongs to the field of power electronics technology and robust control technology, and relates to a new type of advanced static var compensator (STATCOM) based on DSP control strategy, using decentralized robust control theory, and starting from the stand-alone-infinite system of STATCOM. Its dynamic process, establish the STATCOM dynamic model and the differential equation containing the STATCOM power system dynamic model, to design the H of STATCOM ∞ Robust controller and generator excitation robust controller. 【Background technique】: [0002] At present, the research on static var compensator (STATCOM) mainly focuses on the main connection mode and topology, system modeling, system control method and its effect on power system stability and so on. The world's first STATCOM industrial device using GTO developed by Westinghouse Corporation of the United States uses multiple inverters to connect to the voltage grid through meandering...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCY02E40/16Y02E40/10
Inventor 吴凤英刘一琦周雪松马幼捷刘思佳刘进华于阳
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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