New energy power station model verification method based on variable impedance and controlled alternating-current voltage source

Abstract

The invention provides a new energy power station model verification method based on variable impedance and a controlled alternating-current voltage source. The model verification method comprises steps of acquiring actual-measurement voltage, active power and reactive power amplitude of integration points of a wind power plant and a photovoltaic power station; setting amplitude and phase angle of the controlled alternating-current voltage source as fixed values; according to the voltage and active/reactive power amplitude of integration points of the wind power plant and the photovoltaic power station, calculating resistance and reactance values of the variable impedance or setting the resistance and reactance values of the variable impedance to be fixed value so as to calculate the voltage amplitude and the phase angle value of the controlled alternating-current voltage source, and using the variable impedance and the controlled alternating-current voltage source in which the real-measurement data is input to acquire precise value of an external power grid; acquiring active/reactive power values of the integration points via digital simulation calculation, comparing the active/reactive power values with the real-measurement data, and judging that the wind power plant and the photovoltaic power station models are correct if the active/reactive power values is consistent with the real-measurement data, and judging that there are errors if not; and further shrinking the actual-measurement equivalent points. The model verification method can be used for positioning specific positions of error sources of the wind power plant and the photovoltaic power station models.

Description

technical field [0001] The invention relates to a verification method, in particular to a new energy power station model verification method based on variable impedance and controlled AC voltage source. Background technique [0002] With the increasing scale of wind power, photovoltaic power generation and other new energy sources connected to the power grid, their impact on the power grid has received extensive attention and research. The accuracy of the new energy power plant model is a key factor in the study of its interaction with the grid, but it has not been well resolved. At present, in order to obtain accurate model parameters of new energy power generation units and stations, people generally adopt the method of on-site testing of equipment, which requires multiple tests, and then continuously adjusts the model parameters to fit the test curve. Equipment testing will affect the normal operation of new energy power plants and cause economic losses, and such modelin...

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Problems solved by technology

[0004] According to the research results of literature and patents, there is no method and application of the present invention at home and abroad. What is more relevant is the invention patent of "Power System Model Checking Method and System Based on Hybrid Dynamic Simulation" applied by Wu Wenchuan and Zhang Boming of Tsinghua University in 2009 However, this patent is based on the measured data of the phasor measurement unit (PMU) to equivalent the external power grid, but the voltage level (35kV or 110kV) of the access point of the wind farm and the photovoltaic power station in the actual project is generally not high, and there are not many PMUs equipped with it, so This patent is not suitable for verifying models of wind farms and photovoltaic power plants

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