Damping control system optimization method based on damping ratios and phase relative sensitivity

Abstract

The invention provides a damping control system optimization method based on damping ratios and phase relative sensitivity, which comprises the following steps of: analyzing the dynamic stability of an interconnected power system according to the damping ratio of each oscillation mode, selecting a related oscillation mode to be analyzed and adjusted according to the magnitude of the damping ratios and generating units, high-voltage DC transmission system and the like with greatest influence; converting the coordinates of a mathematical model expression of a power system stabilizer (PSS) related to the oscillation mode and other damping control systems so as to achieve the purpose of modular angle separation; maintaining the gain of a transfer function unchanged after parameter adjustment by using an equivalent AC (Alternating Current) gain method; and calculating the sensitivity of the damping ratio relative to phase, carrying out oriented optimization design with a clear direction onthe parameters of the damping control systems according to the sensitivity, increasing the damping ratio of the oscillation mode, and inhibiting the occurrence of low-frequency oscillation. By means of the damping control system optimization method, the blindness that the parameters of the damping control systems are tried and made up by using an approximate method in the prior art is avoided, and the stable operation of a large interconnected power system is facilitated.

Description

technical field [0001] The present invention relates to the technical field of safety and stability control of AC-DC interconnected power systems, in particular to a damping control system optimization of AC-DC interconnected power systems based on transfer function mode angle separation theory, equivalent AC gain method and relative sensitivity of damping ratio and phase method. Background technique [0002] The load capacity of an interconnected large scale system (Large Scale System) usually has tens of millions or even hundreds of millions of kilowatts, and the population in the power supply area usually reaches tens of millions or even hundreds of millions. Hundreds of substations in the grid are composed of thousands of AC transmission lines are connected to a small number of large-capacity, long-distance high-voltage DC transmission systems, in which hundreds of generators and their excitation systems are installed, with grouping and associated structural features. H...

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Problems solved by technology

[0007] However, at present, in quite a few cases, on-site testing methods are incomplete, external conditions make the test inaccurate, manufacturers’ models and parameters are unknowable, unmeasurable, and have errors. The on-site tuning of damping control systems such as PSS is very difficult. It is difficult to achieve the optimal engineering, and its adaptability will also have problems

[0008] In addition, since there is no practical parameter optimization calculation method, people have not been able to optimize and predict the specific effects and specialties of damping control systems such as PSS in suppressing low-frequency oscillations by means of calculation and analysis.

[0009] For a long time, on the one hand, it has been difficult to solve the problem of distinguishing the effect of multiple influencing parameters (that is, the change of this parameter will cause the change of multiple factors affecting the change of the damping ratio at the same time). On the other hand, it is limited by the phase, amplitude and operating Due to the limitation of non-analytical constraints such as the influence of mode changes, a set of practical, reliable, and adaptable parameter optimization methods for PSS and other damping control systems have not been developed so far, which can be used in actual calculations or experiments, which is not conducive to all Further improvement of global stability of interconnected power system

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