Grid Connected Oscillation Mode of Virtual Synchronous Generator Based on Clean Energy

Abstract

Introduction: With the large-scale application of distributed generation in power grid, power grid is developing towards low inertia and low damping. As the virtual synchronous generator (VSG) has the characteristics of synchronous generator and inverter, it may face the risk of oscillation during grid connected operation.

Objectives: To solve this problem, this paper proposes current balance control and power oscillation suppression strategies without changing the characteristics of the virtual synchronous generator.

Methods: At varius vel pharetra vel turpis nunc eget lorem. Feugiat scelerisque varius morbi enim nunc. Cras semper auctor neque vitae tempus quam pellentesque nec. Faucibus purus in massa tempor nec feugiat nisl. Congue nisi vitae suscipit tellus mauris a. Est sit amet facilisis magna etiam tempor. Dictum varius duis at consectetur. Purus semper eget duis at tellus at urna. Ipsum consequat nisl vel pretium. Viverra maecenas accumsan lacus vel facilisis volutpat est. Bibendum arcu vitae elementum curabitur vitae nunc sed. Nisl tincidunt eget nullam non nisi est. Ac turpis egestas integer eget aliquet nibh praesent.

Results: On this basis, the relationship between VSG current inner loop, power outer loop, VSG parallel operation and different oscillation frequencies is analysed. In this paper, a small signal model is established under the condition of different influencing factors. At the same time, this paper systematically analyses the high frequency, power frequency and low frequency oscillation modes existing in VSG grid connected operation.  

Conclusions: Finally, through MATLAB/Simulink simulation, this paper verifies the correlation between different oscillation modes and corresponding dominant influencing factors when VSG is connected to the grid.