Three-phase weak power grid converter group grid-connected simulation method and simulation terminal

Abstract

The invention discloses a three-phase weak power grid converter group grid-connected simulation method and a simulation terminal. The method comprises the following steps: decoupling a single converter module to obtain a first module and a second module; making a linear inductor in the first module, the on-state of a nonlinear switching device, the off-state of the nonlinear switching device and atransformer equivalent to a first equivalent inductor, a second equivalent inductor, a first equivalent capacitor and a third equivalent inductor respectively, and constructing a first inductor discrete model, a second inductor discrete model, a first capacitor discrete model and a third inductor discrete model respectively; processing the first inductor discrete model, the second inductor discrete model, the first capacitor discrete model and the third inductor discrete model to obtain equivalent models; processing the equivalent models by using a node analysis method to obtain a multiplication model of the first module; and obtaining an equivalent model of a single converter according to the multiplication module of the first module and the equivalent model of the second module. By adopting the scheme, the calculation amount is small, and the simulation efficiency is high.

Description

technical field [0001] The present application relates to the technical field of simulation testing, and in particular to a simulation method and a simulation terminal for three-phase weak grid converter group grid connection. Background technique [0002] The new energy power generation system has been widely researched and applied in today's society, but it also brings many new problems to the stability of the entire power grid. New energy power generation systems generally use power electronic equipment to be integrated into the grid. Under weak grid conditions, the dynamic interaction between multiple power electronic power generation equipment and the AC grid is prone to oscillation problems. In recent years, many low-frequency oscillation accidents related to new energy grid-connected systems have occurred around the world. Therefore, it is very important to study the characteristics of the converter group under the condition of weak grid and solve the problems such a...

AI Technical Summary

Problems solved by technology

[0003] However, at present, the electrical torque method, frequency domain method, characteristic analysis method, etc. are used to study the characteristics of the converter group in the case of the above weak grid, and there are many nonlinear devices in the power system, and the large-scale system circuit cannot realize the real-time simulation function.

Images