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Hybrid Thermal and Electric and Energy Storage System Stephane Bilodeau1, Michael Carty1, Chris Mashburn2 and Ross Quick2 1Advanced Engineering & Technology Department, Novacab Inc., 18 Paul Gauguin, Candiac, QC, Canada J5R 6X1 2U.S. Head Office, Novacab Inc.,11701 Bee Cave Rd, Suite 124, Austin, Texas 78738 Abstract- Electric Energy Storage (EES) and Thermal Energy Storage (TES) have been integrated in a hybrid approach to optimize energy efficiency and load leveling. This integration is allowing for significant improvement and stability in the operation in critical applications such as hospital, datacenters, military facilities, manufacturing plants, and other critical thermal + electric demand-side management. Using the extensive experience in the hybrid energy storage for vehicles and mobile applications, a special Synthetic Phase Change Material (SPCM) has been developed to act as a shock absorber in stationary thermal processes. The Hybrid Thermal and Electrical Energy Storage System (HTEES) maximizes the flexibility and the overall performance of the equipment on the grid. Monitoring in a datacenter has shown that optimum results are obtained when initial fluctuating conditions were observed. Improved performance and stability were measured and have shown that ramp up and ramp down of the equipment are reduced and the supply and return process temperatures are stabilized. It allows for performance improvement and more reliability in the operation. For the grid, the impact would also be substantial: smoothing the load profile and optimizing demand side management; and improved redundancy and predictability of the energy distribution. The integration and combined outcomes of the HTEES system is highlighted in the paper, including onsite operational data, Power Usage Effectiveness (PUE), reliability, and performance. Keywords- hybrid system, thermal energy storage, phase change material, renewable energy, smart grid I. INTRODUCTION A. Background The continuously rising cooling demand represents a challenge for existing electrical networks and future smart grids since it contributes to electricity peak demand, which is increasing substantially. In this context, well integrated in the electric supply, thermal energy storage can play an important role in shaving the peak demand, burdening the electrical grid. Hybrid energy storage can be used to develop demand-side management strategies able to shift the load from peak to off- peak hours (exploiting potential for price arbitrage) even in the presence of renewable energy production. Hybrid-demand side management is a mean to increase the overall efficiency of the entire electricity network - from generation to the end use - which consists of optimizing the allocation of resources, limiting the peak demand, and shaping the demand depending on the necessity of the grid. B. Foregoing and Related Works This paper presents hybrid systems, integrating Electric Energy Storage (EES) and Thermal Energy Storage (TES) that have been implemented in order to optimize energy efficiency and load leveling for Renewable Energy and Critical Processes. Using the extensive experience in the hybrid energy storage for vehicles, a special Synthetic Phase Change Material (SPCM) has been developed. What we generally see in the energy storage field, is that the different storage technologies are considered only as competitors and not as potential collaborators. Seeing the different technologies in a competitive mode; this is the paradigm. In fact, no single technologies could easily compete with the energy density of the cheap fossil fuel. It is important to find ways for these technologies to make the new technologies to work together. That would not only help to increase the efficiency of the whole process, but also it would lead to better energy management. This is what this paper is all about: integrating two storage complementary technologies in a hybrid approach: the HTEES. II. TECHNOLOGY DESCRIPTION A. Hybridization with Regulation Strategy Combining Thermal and Electric Capacities Using this joint/collaborative approach and using our work in the hybrid energy storage for vehicles, we have developed special SPCM and the HTEES. The control of the system is based on an anticipatory regulation strategy using fuzzy logic and a combined feedforward plus feedback control that can handle,PDF Image | Hybrid Thermal and Electric and Energy Storage System
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