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Unified power flow controller additional damping control system capable of restraining subsynchronous oscillation

A technology with additional damping control and power flow controller, applied in the direction of reducing/preventing power oscillation, reducing flicker of AC network, etc., can solve the problem of large subsynchronous oscillation of power system, and achieve safety, improve stability and low investment cost Effect

Active Publication Date: 2016-06-01
ELECTRIC POWER SCI RES INST OF JIANGSU ELECTRIC POWER +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The existing unified power flow control system is relatively large for the subsynchronous oscillation of the power system

Method used

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  • Unified power flow controller additional damping control system capable of restraining subsynchronous oscillation
  • Unified power flow controller additional damping control system capable of restraining subsynchronous oscillation
  • Unified power flow controller additional damping control system capable of restraining subsynchronous oscillation

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Embodiment Construction

[0051] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0052] Additional controller feedback control signal: In order to achieve the purpose of suppressing the SSO of the system, it is necessary to control the UPFC device to inject a sub-synchronous frequency current of a complementary frequency into the system. The generator shaft speed deviation is used as the feedback control signal, and since the UPFC converter controller includes the current inner loop control link, the UPFC output current can quickly track the current inner loop control signal, so the additional control signal is superimposed on the UPFC converter The current inner loop command controlled by the controller. for frequency ω i In the SSO mode of , the subsynchronous additional controller will superimpose ω on the dq axis current ...

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Abstract

The invention discloses a unified power flow controller additional damping control system capable of restraining subsynchronous oscillation. The unified power flow controller additional damping control system comprises a subsynchronous damping controller, wherein the additional control signals are superimposed in current inner loop control instructions of reactive control circuits of a shunt-wound side converter and a series-wound side converter of the unified power flow controller; the subsynchronous damping controller comprises multiple subsynchronous modal control circuits; each subsynchronous modal control circuit comprises a modal filter, a proportion amplifying module and a phase shifter for realizing phase compensation separately; the output signals of each subsynchronous modal control circuit are subjected to signal superposition and amplitude limiting to form the additional control signals output by the subsynchronous damping controller; and the subsynchronous damping controller takes generator shaft system rotating speed deviation as the input control signal. The unified power flow controller additional damping control system provided by the invention is capable of restraining subsynchronous oscillation of the power system successfully and the normal and steady operation of the system and the unified power flow controller is not affected.

Description

technical field [0001] The invention relates to a unified power flow controller (Unified PowerFlow Controller, UPFC) additional damping control system for suppressing subsynchronous oscillation, and belongs to the technical field of subsynchronous oscillation (Subsynchronous Oscillation, SSO) suppression. Background technique [0002] With the advancement of my country's "West-to-East Power Transmission" power development strategy, in order to meet the power transmission needs of large power bases far away from the load center, series capacitor compensation transmission and high-voltage direct current transmission (HVDC) have been widely used in my country; however, Series capacitor compensation transmission and high-voltage direct current transmission not only improve the transmission capacity of the system and bring great economic benefits, but also make the power system face severe SSO problems. [0003] As the most powerful flexible AC transmission (FACTS) device today, t...

Claims

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/002H02J3/24
Inventor 朱鑫要赵静波周前刘建坤嵇托安海云陈静王大江金梦
Owner ELECTRIC POWER SCI RES INST OF JIANGSU ELECTRIC POWER
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