A Modeling Method of Black Box Model of Virtual Synchronous Machine

Abstract

The invention provides a modeling method of a virtual synchronous machine black box model, which belongs to the technical field of new energy grid-connected power generation and energy storage. The black-box model including the virtual synchronous machine contains two parameters: the parameter M that describes the active power response of the virtual synchronous machine to the out-of-frequency characteristics of the grid Pf , the parameter M describing the reactive power response of the virtual synchronous machine to the external characteristics of the grid voltage QU ; Obtain the input and output data of the black box of the virtual synchronous machine through the grid frequency disturbance step experiment and the grid voltage disturbance step experiment, and use the parameter identification to establish the description parameter M Pf The output error model and description parameter M of QU multicenter model. The different model structures selected by the present invention according to the characteristics of the black box parameters can accurately describe the external characteristics of the virtual synchronous machine connected to the grid; the modeling process does not need to know the internal control parameters of the virtual synchronous machine, and the built black box model greatly reduces the amount of calculation and shortens the simulation time , which saves storage space and is suitable for the simulation analysis of large-scale virtual synchronous machine systems at the system level.

Description

technical field [0001] The invention relates to the technical field of new energy grid-connected power generation and energy storage, in particular to a modeling method for a black-box model of a virtual synchronous machine. Background technique [0002] The grid-connected converter is the interface between the distributed generation system and the grid, and its optimal control is the key to the system operation. The control strategy of the traditional grid-connected converter lacks the degree of integration with the power system, which brings challenges to the stability and safety of the grid operation. The virtual synchronous machine can simulate the electromechanical transient characteristics of the synchronous generator and the ability to damp power oscillation. When the frequency or voltage of the grid fluctuates, it actively participates in the frequency regulation and voltage regulation of the system, and dynamically makes up for the power difference, thereby helping ...

AI Technical Summary

Problems solved by technology

[0003] The common mechanism modeling method can only reflect the power command response characteristics of the virtual synchronous machine near a certain steady-state operating point. All the information required for the modeling of the synchronous machine mechanism, even if all the data can be mastered to establish an accurate detailed model, due to the limitations of simulation speed and model complexity, the detailed model is not suitable for the simulation calculation of large-scale virtual synchronous machine systems

In addition, there are many ways to realize the virtual synchronization machine, and the specific parameter settings are very different. It is difficult to unify the model. It is impossible for the system layer to carry out mechanism modeling for all virtual synchronization machines separately.

Images