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Method for controlling constant-power inverse model of ultra-/extra-high voltage magnetically controlled shunt reactor

A control method and ultra-high voltage technology, applied in the output power conversion device, the conversion of AC power input to AC power output, electrical components, etc., can solve the problems of inability to achieve dynamic compensation, high capacitive charging power, etc.

Active Publication Date: 2011-07-20
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The huge capacitive charging power of EHV / UHV AC transmission lines, drastic power flow changes and limited insulation margins pose a huge challenge to the reactive power regulation and overvoltage suppression of the system. The traditional reactive power compensation device connected to the low-voltage winding side of the transformer is cut off at the same time, and dynamic compensation cannot be realized

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  • Method for controlling constant-power inverse model of ultra-/extra-high voltage magnetically controlled shunt reactor
  • Method for controlling constant-power inverse model of ultra-/extra-high voltage magnetically controlled shunt reactor
  • Method for controlling constant-power inverse model of ultra-/extra-high voltage magnetically controlled shunt reactor

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Embodiment Construction

[0056] The magnetically controlled shunt reactor uses the characteristics of AC and DC hybrid excitation to change the saturation degree of the iron core, and its magnetic circuit wiring method is as follows: figure 1 As shown, the core of the main magnetic circuit includes two windings, U 1 , U 2 is the AC network side winding, U d1 , U d2 is the DC winding voltage, due to the different permeability of different magnetic circuits, the magnetic flux The reluctance of the two main magnetic circuits where it is located bears the main excitation magnetomotive force in the whole system. The resistance is r, the current is I, H is the magnetic field strength, μ is the magnetic permeability, and φ is the initial phase of the AC voltage. The subscripts 1 and 2 of each variable represent the winding sides of the left and right legs respectively, 3, 4 and 5 represent the side yoke magnetic circuit, and d represents the DC flow. The magnetic circuit structure principle of the high...

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Abstract

The invention provides a method for controlling a constant-power inverse model of an ultra- / extra-high voltage magnetically controlled shunt reactor. By adopting the design idea of decomposing and modeling, dynamic effects of a nonlinear element part and an external system of the magnetically controlled shunt reactor are respectively modeled. The structural principle of a magnetic circuit of the magnetically controlled shunt reactor is analyzed, an inverse object equation describing the characteristics of a nonlinear magnetic circuit is established, the characteristics of a saturable magnetic circuit are described with arc hyperbolic function, Taylor's expansion is carried out on a nonlinear equation according to Abel theorem, an exciting current required by a control system is solved through analytic solution, and an inverse object transfer function is built according to the correlation between the external power system and the magnetically controlled shunt reactor. In addition, the control method creates a new idea for designing other nonlinear element controllers.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a constant power inverse model control method for an ultra-ultra-high voltage magneto-controlled shunt reactor, which can be applied to the dynamic control of nonlinear elements, especially the constant power control of the magneto-controlled shunt reactor. Background technique [0002] With the construction of the Three Gorges Hydropower Station, the Jiuquan 10 million-kilowatt wind power base, and Qinghai / Gansu large-scale photovoltaic power stations, the backbone grid of my country's AC power system should adopt ultra-high voltage compact lines to achieve long-distance and large-capacity transmission. Power transmission, give full play to the important role of power grid in optimizing the allocation of energy resources on a large scale; promote the efficient and intensive development and utilization of primary energy; alleviate the constraints of energy and the environment on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P13/00
Inventor 郑伟杰
Owner CHINA ELECTRIC POWER RES INST
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