Journal
ENERGIES
Volume 12, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/en12101892
Keywords
energy router; model predictive control; voltage source inverter; idle mode; nearly zero energy building
Categories
Funding
- Estonian Research Council [PUT1680]
- Estonian Centre of Excellence in Zero Energy and Resource Efficient Smart Buildings and Districts, ZEBE - European Regional Development Fund [2014-2020.4.01.15-0016]
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The energy router (ER) is regarded as a key component of microgrids. It is a converter that interfaces the microgrid(s) with the utility grid. The energy router has a multiport structure and bidirectional energy flow control. The energy router concept can be implemented in nearly zero energy buildings (NZEB) to provide flexible energy management. We propose a concept where ER is working as a single grid-forming converter with a predefined voltage reference. The biggest challenge is to maintain regulated voltage and frequency inside the NZEB in the idle operation mode, where traditional regulators, e.g., proportional-resonant (PR), proportional-integral-derivative (PID), will not meet the control design requirements and could have unstable behavior. To gain the stability of the system, we propose model predictive control (MPC). The design of the MPC algorithm is explained. A simulation software for power electronics (PLECS) is used to simulate the proposed algorithm. Finally, the simulation results are verified on an experimental prototype.
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