PSS (Power System Stabilizer) phase compensation link time constant calculation method

Abstract

The invention discloses a PSS (Power System Stabilizer) phase compensation link time constant calculation method which comprises the following steps of: 1) listing a frequency-phase two-dimensional sampling data point set to be compensated by PSS; 2) obtaining a curve fitting function according to the phase compensation link transfer function phase-frequency characteristic expression of the PSS; 3) writing a nonlinear least square fitting program; and 4) substituting the sampling data point set and the curve fitting function into the nonlinear least square fitting program, obtaining the values of a plurality of time constants to be determined in the curve fitting function through operation and calculation, obtaining the phase compensation link time constant of the PSS, and completing the calculation of the phase compensation link time constant of the PSS. The PSS phase compensation link time constant calculation method based on nonlinear least square fitting has definite principle, simple calculation, good compensation effect, convenience and quickness in operation and good application prospects.

Description

technical field [0001] The invention relates to a method for calculating the time constant of a phase compensation link of a power system stabilizer (PSS) based on nonlinear least square fitting, and belongs to the technical field of network source coordination. Background technique [0002] In recent years, with the development of large-scale power systems and the wide application of fast excitation systems, the system damping has been continuously reduced, and at the same time, negative damping or weakly damped low-frequency oscillations have appeared in the power grid. Its oscillation frequency is usually in the range of 0.2-2.0Hz. When low-frequency oscillation occurs in the power grid, it will endanger the safe and stable operation of the entire power grid system and limit the ability of the tie line to transmit power. In order to solve this problem, only adding various The damping of the oscillation mode can reduce or weaken low-frequency oscillations and improve the s...

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Problems solved by technology

[0003] The tuning method of the time constant of the phase compensation link of the PSS in the prior art is mainly based on the following principle, assuming that the known compensation angle is Φ, if the two-stage transfer function is Compensation is carried out in the leading link of each level, and each level compensates Φ / 2, which can be calculated according to the basic formula of the leading link In order to determine the time constant of the compensation link, but the time constant of the phase compensation link obtained by the above method needs to be fine-tuned in engineering practice, and the fine-tuning is usually carried out on the basis of empirical values. The frequency-phase point fitting to meet the requirements of phase compensation has a certain degree of blindness, heavy workload and low efficiency, and it is difficult to take into account the phase compensation requirements at all frequencies

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