Rapid quantitative evaluation method and system of static stability situation of large power network

Abstract

The invention provides a rapid quantitative evaluation method and system of a static stability situation of a large power network. The method comprises: establishing a generalized parallel structure model according to power network measurement information, and establishing a generalized source network load equivalent model; calculating a power module index by an impedance module index of the generalized source network load equivalent model; and evaluating a static stability degree of the power network in real time according to a power module index value. The technical scheme provided by the invention can be used to quantitatively evaluate the whole static stability situation of the power network in an accurate, rapid, real-time, and online manner, can be applied to a wide variety of fields such as stable online monitoring, operation modes and power network planning of the large power network, and has a larger practical value of projects and a larger promotion prospect.

Description

technical field [0001] The invention relates to the field of static stability safety evaluation of large power grids, in particular to a method and system for rapid quantitative evaluation of static stability situations of large power grids. Background technique [0002] After the Energy Internet strategy was put forward, with the continuous expansion of the scope of energy interconnection and the proportion of renewable energy access, the safe and stable operation of the power grid is again facing a strong impact. In recent years, many blackouts at home and abroad have caused huge economic losses and serious social impacts, and also exposed many problems in the existing online security prevention and control mode of the power grid. [0003] In the existing grid online security prevention and control technology, although the early full-step power coefficient static stability power angle criterion is highly adaptable to a certain extent, the reliability of the multi-machine s...

AI Technical Summary

Problems solved by technology

In the online security prevention and control method using the wide-area measurement system, the real-time analysis method of voltage stability based on the form of node admittance matrix improves the effectiveness and calculation speed of the traditional static voltage stability analysis method, and has certain advantages; based on elastic mapping The method maps elastic mechanics to the power grid and uses this theory to analyze the static power angle stability of the generator; based on the grid static stability rapid evaluation criterion of mapping the generalized elastic coefficient, the overall safety and stability of the power grid is analyzed from the perspective of elastic mechanics. It is an improvement in the analysis of power grid security and stability. However, since this method needs to integrate energy for each branch of the power grid, the amount of calculation is large and complex, and it cannot meet the requirements of calculation speed and accuracy in practical applications. However, the maximum value of the generalized elastic coefficient of the power grid cannot be obtained in practical engineering applications, and there are still some deficiencies in the quantitative evaluation of the power grid

In addition, the "source-network-load" equivalent model established by it is established from the perspective of elastic mechanics space, and the applicability of the model is not strong when it is separated from the elastic mechanics space

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