Parameter optimization method and system based on multi-virtual synchronous generator parallel grid-connected system

Abstract

The invention relates to a parameter optimization method and system based on a multi-virtual synchronous generator parallel grid-connected system. The method comprises the following steps: S1, performing Lyapunov indirect method criterion on a small signal model of the multi-virtual synchronous generator parallel grid-connected system containing a control link; s2, calculating a damping ratio and a real feature root according to the small signal state matrix; s3, constructing a dynamic evaluation function according to the stability and dynamic characteristics of the system; s4, giving a weight to the dynamic evaluation function by using an entropy weight method; and S5, judging the optimal solution of the evaluation function by using a quasi-annealing particle swarm algorithm. According to the method, the dynamic performance evaluation function is constructed for the multi-virtual synchronous generator parallel grid-connected system, so that the influence of parameters on the system is better evaluated; an entropy weight method is used for weight construction, and a complex trial and error process is avoided; and the dynamic performance evaluation function is solved by using the artificial intelligence algorithm to simulate the annealing particle swarm algorithm, so that the method is simpler, more convenient and more effective, and meanwhile, the solving process is better prevented from falling into a local optimal situation.

Description

technical field [0001] The invention relates to the technical field of parameter optimization, in particular to a parameter optimization method and system based on a parallel-connected system of multiple virtual synchronous generators. Background technique [0002] Distributed power sources are generally connected to the grid through voltage source converters. In the early power control strategy, the voltage source converters hardly participated in grid regulation, and could not provide voltage and frequency support for the grid when the system was disturbed, reducing Safe and stable operation of the power grid. In this regard, the virtual synchronous generator control technology is based on the duality between the mathematical model of the voltage source converter and the mechanical equations and electromagnetic equations of the traditional synchronous generator, so that the voltage source converter has inertia and damping characteristics similar to those of the synchronous...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems existing in the prior art, the present invention provides a parameter optimization method and system based on a multi-virtual synchronous generator parallel grid-connected system, which is used to overcome control parameters in multiple control loops in a multi-virtual synchronous generator parallel grid-connected system. For many problems that are difficult to tune, by constructing the dynamic evaluation function of the system, the global performance evaluation of many control parameters of the system can be carried out at the same time, and the control parameters can be optimized. Function for weight distribution, avoiding tedious trial and error process

Images