Power Hardware-in-the-Loop Simulation in Energy Systems

Power Hardware-in-the-Loop (PHIL) simulation combines real-time digital models of electrical networks with physical power components to create a closed-loop testing environment. By emulating grid conditions and injecting power into actual hardware under test, PHIL enables researchers and engineers to validate control strategies, protective functions and integration schemes for distributed energy resources without exposing field installations to risk. High-fidelity power interfaces synchronise simulated and physical domains, ensuring stability and accuracy even under rapid transients. This approach accelerates the development of microgrid controllers, renewable-energy inverters and energy-storage systems by revealing interactions among converters, storage devices and network impedances. It supports compliance testing for grid-support functions such as volt-var and frequency-watt control, fosters cybersecurity assessments through cyber-physical co-simulation and helps to refine digital-twin models for future smart grids. Challenges remain in managing interface time delays, ensuring precise current and voltage measurements, and standardising test procedures across diverse platforms. Nevertheless, PHIL simulation is gaining global traction as a cost-effective means to de-risk technology deployment, optimise renewable penetration and enhance resilience in evolving power systems.

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Power Hardware-in-the-Loop Simulation in Energy Systems publication trend

The graph below shows the total number of articles in power hardware-in-the-loop simulation in energy systems across all publications each year (not limited to Nature Index journals).

Technical terms

Power Hardware-in-the-Loop (PHIL): A method for testing physical power devices by connecting them to a real-time simulated electrical network through a bidirectional power interface.

Real-time simulation: Execution of dynamic system models at the same rate at which the real world evolves, allowing seamless interaction with hardware.

Power interface: Hardware assembly—including amplifiers and converters—that injects signals or power between the digital simulator and the physical device under test.

Distributed energy resources (DERs): Small-scale power generation or storage technologies, such as photovoltaic arrays, wind turbines and battery systems, located close to consumption points.

Microgrid: A localized grouping of loads and DERs capable of operating autonomously or in coordination with the main grid for improved reliability and efficiency.

References

1. Advanced Laboratory Testing Methods Using Real-Time Simulation and Hardware-in-the-Loop Techniques: A Survey of Smart Grid International Research Facility Network Activities. Energies (2020).
2. Accurate and Stable Hardware-in-the-Loop (HIL) Real-Time Simulation of Integrated Power Electronics and Power Systems. IEEE Transactions on Power Electronics (2020).
3. A Review of PHIL Testing for Smart Grids—Selection Guide, Classification and Online Database Analysis. Electronics (2020).
4. Flywheel energy storage system based microgrid controller design and PHIL testing. Energy Reports (2022).
5. Developing Power Hardware-in-the-Loop Based Testing Environment for Volt-Var and Frequency-Watt Functions of 500 kW Photovoltaic Smart Inverter. IEEE Access (2020).