Frequency response analytical calculation method suitable for all damping states

Abstract

The invention discloses a frequency response analytical calculation method suitable for all damping states, and belongs to the technical field of frequency modulation of power systems. The method comprises the following steps: step 1, acquiring key frequency modulation parameters of a whole-network synchronous machine; 2, a mechanical gain coefficient is set, and inertia, a difference adjustment coefficient, a reheating time constant and a high-pressure turbine power fraction are set through the set mechanical gain coefficient; 3, aggregating the four key frequency modulation parameters in the step 2 to obtain a stand-alone equivalent model, and obtaining an inertia center frequency response transfer function according to a structure diagram obtained after simplification of the stand-alone equivalent model; and 4, carrying out Laplace inverse transformation on the inertia center frequency response transfer function in the step 3 to obtain a whole-network inertia center frequency response time domain analysis model. According to the method provided by the invention, the frequency response of the inertia center of the whole network can be analyzed and calculated more accurately, and meanwhile, the calculation effect is further close to a real power grid.

Description

technical field [0001] The invention relates to the technical field of power system frequency modulation, in particular to a frequency response analytical calculation method applicable to all damping states. Background technique [0002] With the gradual exploitation of fossil energy, the demand for energy is gradually increasing, and the relationship between human beings and nature is becoming increasingly tense. In this context, building a new power system with new energy as the main body, considering new energy grid connection and related technologies has become an important direction for the development of future power technology. [0003] The proportion of new energy in my country is increasing year by year, but new energy itself has the characteristics of volatility and weak inertia, which leads to poor support for the system frequency by new energy after the load disturbance of the regional power grid, so the synchronous machine still undertakes the main frequency mod...

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Problems solved by technology

[0003] The proportion of new energy in my country is increasing year by year, but new energy itself has the characteristics of volatility and weak inertia, which leads to poor support for the system frequency by new energy after the load disturbance of the regional power grid, so the synchronous machine still undertakes the main frequency modulation effect

[0004] Although the frequency response research of the synchronous machine system has been in-depth, the mainstream frequency response calculation method cannot be applied to the overdamped state, and the frequency response calculation method for any damped state needs to be improved. How to better develop the anti-disturbance capability for the power grid Strong day-ahead scheduling planning services are yet to be studied

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