Dual Synchronous Generator: Inertial Current Source based Grid-Forming Solution for VSC

TL;DR

This paper proposes a dual synchronous generator control method for VSCs to enhance inertial response and stability in power systems with high renewable energy penetration, verified through experiments.

Contribution

It introduces a dual synchronous control approach for VSCs to provide inertial current sources, improving transient stability in renewable-rich power systems.

Findings

Effective inertial current source achieved

Enhanced transient stability demonstrated

Experimental validation confirms the control method

Abstract

In order to improve dynamic characteristics of the power system with high-proportion renewable energy sources (RESs), it is necessary for the voltage source converter (VSC), interfaces of RESs, to provide inertial and frequency regulation. In practical applications, VSCs are better to be controlled as a current source due to its weak overcurrent capacity. According to the characteristic, a dual synchronous theory is proposed to analyze the synchronization between current sources in this paper. Based on dual synchronous idea, a dual synchronous generator (DSG) control is applied in VSC to form inertial current source. In addition, a braking control is embedded in DSG control to improve the transient stability of VSC. Finally, experimental results verify the effectiveness of the theory and the control method.