A Frequency Deadband-Based Virtual Inertia Control for Grid-Connected Power Converters

다국어 초록 (Multilingual Abstract)

Unlike synchronous generators, renewable generators, e.g. photovoltaic (PV) arrays and wind turbines, cannot provide rotating inertia when connected to the grid through power converters. As a result, excessive grid frequency deviations are likely to occur in the event of generator tripping and/or load shedding. An effective approach to increase inertia is achieved by proportionally associating the dc-link voltage of grid-connected power converters with the grid frequency, allowing power converters to generate a fixed amount of virtual inertia for frequency support. To further develop this idea, this paper proposes a frequency deadband-based virtual inertia controller for power converters to perform inertia responses during frequency events. The proposed controller enables the increase of inertia in a shorter time duration, leading to an improved frequency nadir and a reduction of the energy required for inertia emulation. Finally, simulated and experimental results are presented to verify its effectiveness.

목차 (Table of Contents)

• Abstract
• I. INTRODUCTION
• II. SYSTEM CONFIGURATION
• III. FREQUENCY DEADBAND-BASED VIRTUAL INERTIA CONTROLLER
• IV. SIMULATED VERIFICATION
• V. EXPERIMENTAL VERIFICATION
• VI. CONCLUSIONS
• REFERENCES