Power grid steady state frequency estimation method considering security control policy and primary frequency modulation characteristic

Abstract

The invention discloses a power grid steady state frequency estimation method considering a security control policy and a primary frequency modulation characteristic, which belongs to the field of safety and stability analysis of a power system. According to the invention, based on the static frequency characteristic of a load, the power grid steady-state frequency after a fault is estimated through a security control action behavior and the quasi-static simulation of the primary frequency modulation characteristic of a power generator. The method comprises the steps that the steady-state frequency of each synchronous power grid is calculated according to the active unbalance of each synchronous power grid after fault removal and the implementation of the emergency control measures; the power grid steady-state frequency of an acted centralized low-frequency control system or an acted centralized high-frequency control system is calculated round by round; when the steady-state frequency is less than the basic wheel action frequency of a low-frequency load-shedding device, the power grid steady-state frequency after the basic wheel action of the low-frequency load-shedding device is calculated round by round; and finally, according to the primary frequency modulation capability of the power generator and the active static frequency characteristic factor of the power grid, the power grid steady-state frequency considering the security control policy and the primary frequency modulation characteristic is calculated. The method provided by the invention has the advantage of fast calculation, and the precision can meet engineering requirements.

Description

technical field [0001] The invention belongs to the technical field of power system safety and stability analysis. More precisely, the invention relates to a power grid steady-state frequency estimation method considering safety control strategy and primary frequency modulation characteristics. Background technique [0002] The reverse distribution of global energy resources and load centers is a common feature. With the continuous development of power transmission technology and the continuous improvement of voltage levels, especially the successful practice of China's UHV AC and DC projects, for the efficient development, optimal allocation and effective use of energy, It provides a solution and technical basis for the realization of cross-regional, large-scale, and high-efficiency configuration of power. Building a large power grid through the construction of inter-regional UHV transmission channels is the only way to achieve large-scale allocation of energy resources. Du...

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Problems solved by technology

[0004] If the models and parameters of the primary and secondary equipment of the large power grid are consistent with the actual situation, the time-domain simulation method can be used to calculate the frequency dynamic process after the expected fault occurs, and the steady-state frequency of the power grid that takes into account the safety control strategy and primary frequency modulation characteristics can be obtained. But the actual situation is that the models and parameters of the primary and secondary equipment of the large power grid are different from the actual

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