Energy storage grid-connected converter control method and device and computer storage medium

Abstract

The invention discloses an energy storage grid-connected converter control method and device and a computer storage medium. Firstly a system mathematical model is established and the working principleof the system is analyzed; then the influence of the harmonics of the system grid voltage on the synchronous lock phase is effectively removed by GCDSC and the problem of PLL closed-loop adjustment phase lag is compensated by phase feedforward link, and the fundamental phase and frequency of the system can be quickly and accurately detected in the presence of harmonics and imbalance; and then thebackstepping method is applied to design the system controller and the control law of the system is designed based on the Lyapunov stability theory. The anti-jamming ability of the system is improvedand the whole system is asymptotically stable. Finally, a simulation model is built in Matlab / Simulink, and the simulation result shows that the control strategy has better robustness and control accuracy and provides a theoretical basis and technical support for the control strategy of the energy storage converter in comparison with the conventional phase-locked loop and the PI control strategy.

Description

technical field [0001] The invention relates to an energy storage grid-connected converter control method, device and computer storage medium, belonging to the technical field of energy storage converters. Background technique [0002] Due to the characteristics of energy distribution in our country, what needs to be solved now is not only the problem of long-distance power transmission and centralized power generation in the traditional grid, especially in the 21st century, people are looking for energy such as wind power and nuclear power. Energy is an important factor to maintain human survival and social development. As a convenient form of energy, electric energy is the lifeblood of the national economy. [0003] The increasingly serious energy shortage and environmental pollution problems have made new energy sources widely valued and utilized. Distributed generation DG (Distributed Generation) is an effective way to use new energy to generate electricity. Grid-conn...

AI Technical Summary

Problems solved by technology

Among them, although the droop control strategy simulates the "power-frequency static characteristics" of the generator set, it still cannot match the inertia of the synchronous generator, and it is easy to cause shock and oscillation to the large power grid

Images