Virtual Inertia Control Strategies in DC Microgrid Systems
Summary
DC microgrids interconnect distributed energy resources, storage units and loads, offering improved efficiency and controllability relative to AC systems. However, the proliferation of converter-interfaced sources reduces system inertia, making DC bus voltage vulnerable to disturbances and rapid load changes. Virtual inertia control strategies seek to emulate the kinetic energy buffer of mechanical machines by embedding inertial and damping characteristics in power electronic converters. Approaches range from droop-based schemes with added filter loops to virtual synchronous machine analogues and virtual DC motor control. Such techniques adjust converter output in response to voltage dynamics, smoothing transients, enhancing stability margins and facilitating seamless operation in islanded and grid-connected modes. Adaptive implementations further tune inertia and damping parameters in real time, optimising performance under varying operating conditions. Collectively, these developments underpin more resilient DC microgrid operation, supporting higher renewable penetration and enabling stable microgrid clusters in isolated or weak-network environments.
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Virtual Inertia Control Strategies in DC Microgrid Systems publication trend
The graph below shows the total number of articles in virtual inertia control strategies in dc microgrid systems across all publications each year (not limited to Nature Index journals).
Technical terms
Virtual inertia: The synthetic reproduction of kinetic energy buffering in power electronic converters to mitigate voltage or frequency transients.
Droop control: A primary control method where output voltage or current is adjusted in proportion to power deviation for load sharing without central communication.
Virtual synchronous machine (VSM): A control scheme that replicates the dynamic behaviour of a synchronous generator, including inertia and damping, within an inverter.
Virtual impedance: An algorithmic conductance or reactance added to converter control to shape power sharing and damping characteristics.
Virtual DC motor control: A technique that models the converter and energy storage as a DC machine, emulating its inertia and damping to stabilise bus voltage.
References
- Comparative analysis on the stability mechanism of droop control and VID control in DC microgrid. Chinese Journal of Electrical Engineering (2021).
- Parameter-Adaptation-Based Virtual DC Motor Control Method for Energy Storage Converter. IEEE Access (2021).
- A Three-Parameter Adaptive Virtual DC Motor Control Strategy for a Dual Active Bridge DC–DC Converter. Electronics (2023).
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