Dynamic stability control method and system for computer aided design based power system

Abstract

The invention provides a dynamic stability control method and system for a computer aided design based power system. The method comprises the following steps of: calculating a characteristic root of each oscillation mode by analyzing power flow data of an interconnected electric power system; selecting the oscillation mode to be analyzed and adjusted and the most influenced high voltage direct current power transmission system and power generating set according to the characteristic root; calculating the sensitivity of parameters of related high voltage direct current power transmission additional control systems and power system stabilizer (PSS) additional control systems in the oscillation mode; and performing purposeful and clear optimal design on the parameters of the high voltage direct current power transmission additional control systems and the power system stabilizer additional control systems according to the sensitivity to improve the damp in the oscillation mode and suppress low-frequency oscillation. The blindness for scraping the parameters of the high voltage direct current power transmission additional control systems and the PSSs together by using an approximate method is avoided, and stable running of the large scale system is facilitated.

Description

technical field [0001] The invention relates to the technical field of power system safety and stability control, in particular to a computer-aided design-based power system dynamic stability control method and a computer-aided design-based power system dynamic stability control system. Background technique [0002] The large scale interconnected power system (Large Scale System) is the main policy to solve the uneven distribution of energy and load, and it is also the general trend of the development of international and domestic power system technology. Its safe and stable operation has a great impact on the national economy. The load capacity of the interconnected large power 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 and a small Large-capacity, ...

AI Technical Summary

Problems solved by technology

Each generator in the interconnected power system has a PSS, which has a very complex impact on each electromechanical oscillation mode. A single PSS may have an adverse effect on another oscillation mode while inhibiting one oscillation mode. Therefore, if the Accurately coordinate the PSS parameters of each power system stabilizer in the entire interconnected power system according to the specific oscillation mode, which is not conducive to the global stable operation of the interconnected power system

[0006] Moreover, due to the lack of technical means and methods for a large number of AC-DC interconnected power grids, the additional control system of HVDC transmission for trans-regional and large-capacity active power transmission has never been considered in the traditional power system dynamic stability analysis. , therefore, for a long time, people have been unable to predict and bring into play the effect and specialty of the additional control system of HVDC transmission in suppressing low-frequency oscillation between large regions

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