Abstract
Digital-physical hybrid real-time simulation (hybrid simulation) platform integrates the advantages of both digital simulation and physical simulation by combining the physical simulation laboratory and the real-time digital simulator. Based on a 400 V/50 kVA hybrid simulation platform with 500 kVA short-circuit capacity, the hybrid simulation methodology and a Hausdorff distance based accuracy evaluation method are proposed. The case validation of power system fault recurrence is performed through this platform, and the stability and accuracy are further validated by comparing the hybrid simulation waveform and field-recorded waveform and by evaluating the accuracy with the proposed error index. Two typical application scenarios in power systems are studied subsequently. The static var generator testing shows the hybrid simulation platform can provide system-level testing conditions for power electronics equipment conveniently. The low-voltage ride through standard testing of a photovoltaic inverter indicates that the hybrid simulation platform can be also used for voltage standard testing for various power system apparatus with low cost. With this hybrid simulation platform, the power system simulation and equipment testing can be implemented with many advantages, such as short period of modelling, flexible modification of parameter and network, low cost, and low risk. Based on this powerful tool platform, there will be more application scenarios in future power systems.
Highlights
Power system simulation is an important means to research the dynamic behavior, ensure the safety and stability, and optimize the operation of power grids
The case validation of power system fault recurrence is performed through this platform and the stability and accuracy are further validated
The static var generator (SVG) testing scenario provides a low-cost system-level testing method for various power electronics devices owing to the fact that large-scale power systems can be modelled in digital subsystem
Summary
Power system simulation is an important means to research the dynamic behavior, ensure the safety and stability, and optimize the operation of power grids. For the traditional power systems, there are lots of mature digital models and simulation experience; large-scale networks with high power level make it unrealistic to be simulated with actual equipment, so the real-time digital simulation maybe an ideal choice due to its advantages of fast modelling, good flexibility, and low cost. Energies 2018, 11, 2682 the power hardware-in-the-loop (PHIL) simulation, can integrate the physical simulation laboratory and digital real-time simulator [1,2,3]. There is an increasing need to apply the hybrid simulation to the power system simulation and power equipment testing to obtain many advantages, such as short modelling period, flexible modification of network and parameter, low testing cost, and closer-to-reality simulation results.
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