IEEE Transactions on Power Electronics· 2015Q1
Comparison of Dynamic Characteristics Between Virtual Synchronous Generator and Droop Control in Inverter-Based Distributed Generators
- 1,210citations
- Q1SCImago
- 2015year
Short summary
Virtual Synchronous Generator (VSG) control, unlike traditional droop control, emulates swing equations to provide virtual inertia for inverter-based distributed generators, improving system stability.
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Key points
- VSG control emulates swing equations to provide virtual inertia, a feature absent in traditional droop control.
- Small-signal models show VSG has better transient frequency response during loading changes compared to droop control.
- State-space models analyze output active power oscillations, highlighting differences caused by VSG's virtual inertia.
- The study verifies results through simulations and experiments, confirming VSG's advantages in stability and inertia support.
AI-generated from the title and abstract; the full text is not read.
Abstract
In recent researches on inverter-based distributed generators, disadvantages of traditional grid-connected current control, such as no grid-forming ability and lack of inertia, have been pointed out. As a result, novel control methods like droop control and virtual synchronous generator (VSG) have been proposed. In both methods, droop characteristics are used to control active and reactive power, and the only difference between them is that VSG has virtual inertia with the emulation of swing equation, whereas droop control has no inertia. In this paper, dynamic characteristics of both control methods are studied, in both stand-alone mode and synchronous-generator-connected mode, to understand the differences caused by swing equation. Small-signal models are built to compare transient responses of frequency during a small loading transition, and state-space models are built to analyze oscillation of output active power. Effects of delays in both controls are also studied, and an inertial droop control method is proposed based on the comparison. The results are verified by simulations and experiments. It is suggested that VSG control and proposed inertial droop control inherits the advantages of droop control, and in addition, provides inertia support for the system.
The authors' abstract, as published at the source. IEEE Transactions on Power Electronics, 2015 · DOI ↗
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Field: Control and Systems Engineering
Control and Systems EngineeringEngineering