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Terminal STATCOM output current control method and controller for suppressing torsional vibration

A technology of output current and control method, which is applied in the field of machine-side STATCOM output current control method and controller for suppressing torsional vibration, and can solve problems such as poor torsional vibration effect

Active Publication Date: 2019-09-06
NR ELECTRIC CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is: to propose a control method and controller for the STATCOM output current at the machine end to suppress torsional vibration, to solve the problem that the existing STATCOM used for torsional vibration suppression does not participate in the adjustment of power frequency fundamental wave reactive current, and to improve the control link. Proportional resonance controller's poor effect of suppressing shaft torsional vibration

Method used

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  • Terminal STATCOM output current control method and controller for suppressing torsional vibration
  • Terminal STATCOM output current control method and controller for suppressing torsional vibration
  • Terminal STATCOM output current control method and controller for suppressing torsional vibration

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Effect test

Embodiment 1

[0070] Such as figure 1 Shown is the wiring schematic diagram of electrical equipment in the present invention, the STATCOM primary equipment is connected to the generator terminal bus through an isolation transformer, and the STATCOM controller is connected to the turbine generator set speed ω, generator terminal voltage u g , Generator terminal current i g , STATCOM output current i s , STATCOM DC side voltage u dc and other signals; at the same time, the STATCOM controller also receives the external reactive power command Q * . In the figure, CT1 is the machine-side current transformer, PT is the machine-side voltage transformer, and CT2 is the STATCOM output current transformer. The grid system is equivalent to two loops and an infinite power supply system, one of which has capacitor series compensation, and the other There is no capacitor series compensation in the return line.

[0071] figure 2 Shown is the external signal collection of the present invention metho...

Embodiment 2

[0096] The inventive method electrical equipment wiring such as figure 1 As shown, the STATCOM primary equipment is connected to the generator terminal busbar through an isolation transformer, and the STATCOM controller is connected to the turbine generator set speed ω and the generator terminal voltage u g , Generator terminal current i g , STATCOM output current i s , STATCOM DC side voltage u dc and other signals; at the same time, the STATCOM controller also receives the external reactive power command Q * . In the figure, CT1 is the machine-side current transformer, PT is the machine-side voltage transformer, and CT2 is the STATCOM output current transformer. The grid system is equivalent to two loops and an infinite power supply system, one of which has capacitor series compensation, and the other There is no capacitor series compensation in the return line.

[0097] In this embodiment, the rated capacity of the generator is 667MVA, the rated voltage is 20kV, the ra...

Embodiment 3

[0129] Image 6 Shown is a schematic diagram of the relationship between the external signal acquisition and internal calculation modules of the controller of the present invention. A specific embodiment of the machine-end STATCOM controller for suppressing torsional vibration of the present invention includes a power frequency current compensation calculation module and a current control inner loop module, and the power frequency current compensation calculation module calculates according to a given reference value of reactive power The power frequency current compensation value is obtained, and the power frequency current compensation value is input into the current control inner loop module to participate in the calculation of the modulation wave voltage reference value.

[0130] The above-mentioned controller also includes a semaphore measurement module, a modal current compensation calculation module, a DC voltage control outer loop module, and a pulse generation module;...

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Abstract

The invention provides a terminal STATCOM output current control method for suppressing torsional vibration. The method comprises a power frequency current compensation calculation link, a semaphore measurement link, a modal current compensation calculation link, a current control inner loop link, a DC voltage control outer loop link and a pulse generation link. Firstly a power frequency current compensation value, a modal control value and a DC current compensation value are calculated, then the three values are processed by the PIR controller of the current control inner loop link and then amodulated wave voltage reference value is obtained, and finally the trigger pulse is generated through the pulse generation module to control on / off of IGBT in STATCOM and generate the required sub-synchronous / super-synchronous current to be injected into the stator winding of the generator to generate the electromagnetic torque for suppressing the torsional vibration. The invention also correspondingly provides a terminal STATCOM controller for suppressing the torsional vibration. According to the scheme, the STATCOM is enabled to participate in the power frequency fundamental reactive current regulation, and the characteristics of the original PR controller and the torsional vibration suppression effect can be improved and implementation is easy.

Description

technical field [0001] The invention belongs to the technical field of control of electric power electronic equipment in a power system, and in particular relates to a control method and a controller of a STATCOM output current at a machine end for suppressing torsional vibration. Background technique [0002] When the power of the large-capacity turbo-generator set is sent out, if the point-to-grid long-distance transmission mode is adopted, in order to increase the transmission power, the power grid sometimes uses capacitor series compensation, and sometimes uses high-voltage direct current transmission. Theory and practice show that this type of power transmission mode is likely to cause subsynchronous oscillation of the power grid and torsional vibration of the turbine generator shaft system. When sub-synchronous oscillation occurs in the power grid, under the action of machine-network interaction, the rotors of the turbine-generator shaft system, including the turbine h...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02J3/24
CPCH02J3/1885H02J3/24Y02E40/10
Inventor 张琦雪吴小丹王辉王凯马志恒朱信舜孙胜洪盛晓东王新宝王光陈俊
Owner NR ELECTRIC CO LTD
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