Modelling and cooling power control of a TES-backed-up vapour-compression refrigeration system
arxiv(2024)
摘要
This work addresses the modelling, power control, and optimization of a
thermal energy storage (TES) system combined with a vapour-compression
refrigeration facility based on phase change materials (PCM). Given a novel
design of a PCM-based TES tank and its interconnection with an existing
refrigeration system, the joint dynamic modelling is first studied, exploring
the different time scales that coexist at the interconnected system. Diverse
operating modes are defined, according to the intended use of the TES tank as a
cold-energy buffer to decouple cooling demand and production, whereas the
static characteristic and power limits are calculated and show the high
coupling between the main cooling powers involved (TES charging/discharging
power, and direct power production at the evaporator). In this light, a
decoupling control strategy is proposed, where the low-level controllers are
simply PI regulators and the refrigerant/secondary mass flows are considered as
virtual manipulated variables, applying a feedforward-based cascade strategy.
The control performance is evaluated through a thorough simulation that
includes all operating modes, where the reference tracking is shown to be fast
and reliable enough to address high-level scheduling strategies, where the
references on the main cooling powers are intended to be imposed considering
economic and efficiency criteria.
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