Abstract
With more renewables integrated into power grids, the systems are being transformed into low inertia power electronic dominated systems. In this situation, the virtual synchronous generator (VSG) control strategy was proposed to deal with insufficient inertia challenge caused by the reduction of synchronous generation. However, as the VSG control method emulates the dynamic behavior of traditional synchronous machines, the interaction between multiple VSG controllers and synchronous generators (SGs) may cause low-frequency oscillation similar to that caused by the interaction between multiple SGs. This paper reveals that the system low-frequency oscillatory modes are affected by multiple VSGs. Then Prony analysis is utilized to extract the system mode information which will be subsequently used for VSG controller design, and a decentralized sequential coordinated method is proposed to design the supplementary damping controller (SDC) for multiple VSGs. The system low-frequency oscillation is first analyzed based on a modified two-area system with a linearized state-space model, and a further case study based on a revised New England 10-machine 39-bus system is used to demonstrate the effectiveness of the proposed coordinated method for multiple VSGs.
Highlights
OWING to the increasing penetration of power-electronic interfaced renewable energy sources, the current power system is transforming from synchronous generator (SG)-based structure to a power electronics-dominated one
The inertia emulation control which utilizes the energy stored in the DC link capacitor was implemented [4] and it is equivalent to a virtual rotor
This paper has investigated the impact of multiple virtual synchronous generator (VSG) on power system low frequency oscillations
Summary
OWING to the increasing penetration of power-electronic interfaced renewable energy sources, the current power system is transforming from synchronous generator (SG)-based structure to a power electronics-dominated one. [24] proposed a strategy which implements a combination of power feedback signal and the derivative of virtual frequency feedback signal into the active power loop to enhance the damping of VSG. The proposed supplementary control in this paper is similar to the power system stabilizer (PSS)-based control, which can provide one more degree of freedom to enhance the system damping performance and it is easy to be implemented in practice. It is used to extract the low frequency modes information Such measurement-based analysis provides more feasible and flexible design approach for SDC; (3) A coordinated supplementary controller is designed for the virtual exciter loop to provide additional damping. The decentralized sequential control technique is employed to coordinate the supplementary controller design for multiple VSGs. The designed controller is easy to implement and can suppress the system low-frequency oscillation effectively.
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