Wind power active power/ frequency coupling electrical power system frequency characteristic calculation method based on pitch control

Abstract

The invention provides a wind power active power / frequency coupling electrical power system frequency characteristic calculation method based on pitch control. According to a one-time frequency modulation response transfer function model of a single wind turbine unit, a single steam turbine-speed governor model transfer function and a single water turbine-speed governor transfer function, a weighted equivalent polymerization method is used for separately calculating out a wind power plant one-time frequency modulation response transfer function model, a multiple steam turbine-speed governor model transfer function, a multiple water turbine-speed governor transfer function. A one-time frequency modulation control strategy based on the pitch control is taken into consideration, and electrical power system equivalent inertial time constants in different wind power permeability are calculated and solved. By the combination of the models and parameters, an improved SFR frequency response model is constructed, and a closed-loop system transfer function is calculated and solved according to the improved SFR frequency response model, wherein power shortage disturbance serves as input and system frequency deviation serves as output, and therefore a system frequency deviation frequency domain / time domain analytical solution is calculated under a sudden load increase step response. Finally, the validity and accuracy of a calculation method are systematically verified through a simulation example.

Description

technical field [0001] The invention relates to the technical field of analysis and calculation of frequency characteristics of power systems including wind power, in particular to a method for calculating frequency characteristics of wind power active power / frequency coupled power systems based on pitch control. Background technique [0002] In the traditional research on the frequency characteristics of the power grid, the frequency response evaluation model is established by establishing the prime mover / governor model including hydropower units and thermal power units, and considering the inertia response and load regulation effects of conventional units. Calculate and analyze the frequency response characteristics of the power grid, but the contribution of wind power to the system frequency response is not considered. As the penetration rate of wind power continues to increase, in order to ensure the safety and stability of the power grid frequency, primary frequency mod...

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Problems solved by technology

[0002] In the traditional research on the frequency characteristics of the power grid, the frequency response evaluation model is established by establishing the prime mover / governor model including hydropower units and thermal power units, and considering the inertia response and load regulation effects of conventional units. Calculate and analyze the frequency response characteristics of the power grid, but the contribution of wind power to the system frequency response is not considered

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