Power system stabilizer (PSS) configuration method in coordination with low-excitation limiting function

Abstract

The invention relates to a power system stabilizer (PSS) configuration method in coordination with a low-excitation limiting function. The method is characterized by comprising steps: a generator typical leading phase operation working condition point set based on a low-excitation limiting boundary line is set; an open-loop transfer function G<X>(s) for electromagnetic torque increment signals generated by the traditional power system stabilizer PSS1 through an excitation link when low-excitation limiting does not act in relative to PSS1 input signals is determined; an open-loop transfer function G'<X>(s) for electromagnetic torque increment signals generated by the newly-added power system stabilizer PSS2 through an excitation link when low-excitation limiting acts in relative to PSS2 input signals is determined; and by using the transfer function G<X>(s) and the transfer function G'<X>(s), an optimal mathematical model for a lead-lag link time constant of the PSS2 is built and solved. The configuration method of the invention has the advantages that comprehensive factors are considered; the operation is simple and convenient; the practicability is strong; and the deteriorated dynamic stability of the power system caused as the low-excitation limiting acts can be effectively solved.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a method for configuring a power system stabilizer coordinated with a low excitation limiting function. Background technique [0002] Under excitation limit (UEL) is an important auxiliary function in the excitation system. Its function is to prevent the generator from being unstable due to too deep phase advance, prevent the end of the stator core from overheating and reduce the malfunction of the generator loss of excitation protection. risk. UEL can be divided into superposition type and selective type according to the different ways of accessing the excitation system, and the former is more widely used at present. UEL is based on real-time active power P of the unit t , reactive power Q t and terminal voltage U t is the input variable. According to P t and U t Calculated real-time UEL reactive boundary value Q VR , the Q VR with Q t The difference signal is output to th...

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Problems solved by technology

[0004] Because the output signals of UEL and PSS are both output to the voltage superposition point of the excitation system, both of them participate in the excitation adjustment and affect each other during the dynamic process of the unit being disturbed. The traditional PSS parameters cannot achieve the desired effect. Many causes of UEL A case where the dynamic stability of the power system deteriorates

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