Sdelayed time processing and compensating system for wide domain damped control of electric power system

A wide-area damping and time-delay processing technology, applied in the direction of reducing/preventing power oscillation, which can solve the problems of unobtainable system model and complex power system.

Active Publication Date: 2009-06-24
TSINGHUA UNIV +2
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AI Technical Summary

Problems solved by technology

[0007] Both methods are based on an accurate model of the controlled system, and the power system is too complex to obtain an accurate system model
Therefore, the existing methods cannot effectively deal with the influence of delay on the wide-area damping control of power systems

Method used

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  • Sdelayed time processing and compensating system for wide domain damped control of electric power system
  • Sdelayed time processing and compensating system for wide domain damped control of electric power system
  • Sdelayed time processing and compensating system for wide domain damped control of electric power system

Examples

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Embodiment

[0107] Example: China Southern Power Grid's high-voltage direct current wide-area damping control

[0108] The additional control of wide-area damping is implemented in Gaozhao DC in China Southern Power Grid, the purpose is to suppress the low-frequency oscillation between Yunnan and Guizhou in the Southern Power Grid. The feedback signal is the bus frequency difference signal of Yunnan and Guizhou. If the time delay is not considered, the designed damping controller is a simple proportional link. The total magnitude of the control loop delay is 60ms. Due to the low frequency oscillation of 0.55HZ in the system, the damping ratio is less than 3%. The goal of the wide-area damping control is to shift this low-frequency oscillation mode left to the set target pole λ 0 =0.21+j3.46, the damping ratio of the new pole is greater than 5%, and the oscillation frequency corresponding to the imaginary part is approximately equal to the low-frequency oscillation frequency of the orig...

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Abstract

The invention relates to a delayed time processing and compensating system for wide-area damper control of an electric power system and belongs to the stability and control technical field of the electric power system; the delayed time processing and compensating system is characterized in that: the system is composed of a controlled electric power system, a feedback signal time delay circuit of the electric power system, a band-pass filter, a dephasing compensator, a time delay free wide-area damping controller and a control output signal time delay circuit which are sequentially connected in series in a closed loop way; wherein, the setting wide-area damper controlling target is that a pole point which is corresponding to the low damping low-frequency oscillation mode on a complex plane is shifted left to the condition that lambda0 is equal to sigma0 + jomega0, and then according to actually measured frequency response of the electric power system, a phaseshift link circuit is used for counteracting retarding phase produced at the low-frequency oscillation point owning to time delay of a control circuit, and the phase margin of the system is improved by the band-pass filter for making up the lost phase margin caused by phaseshift owning to time delay, thus preventing the system from losing stability. The system leads the wide-area damping controller to still keep the system stability when the size of the total time delay of the control circuit is 0ms-600ms, and the damping effect is the same as the effect without time delay.

Description

technical field [0001] The technical proposal relates to a processing and compensation method for time delay in wide-area damping control, and belongs to the technical field of power system stability and control. Background technique [0002] The occurrence of low-frequency oscillations will endanger the stable operation of the power system. With the interconnection of large-scale power grids and the expansion of the scale of power systems, low-frequency oscillations are becoming more and more serious, and interval low-frequency oscillations with lower frequencies and greater harm appear. [0003] The common means to solve the low-frequency oscillation problem is to control the adjustable devices such as generator excitation, HVDC and FACTS with secondary additional damping control, and the most commonly used is the power system stability controller (PSS) technology. Because PSS uses local signals as feedback signals, the observability of the signals is limited, so it is dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
Inventor 陆超贺静波吴小辰吴京涛李鹏石景海胡炯
Owner TSINGHUA UNIV
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