Data management in the MIRABEL smart grid system

Abstract

Nowadays, Renewable Energy Sources (RES) are attracting more and more interest. Thus, many countries aim to increase the share of green energy and have to face with several challenges (e.g., balancing, storage, pricing). In this paper, we address the balancing challenge and present the MIRABEL project which aims to prototype an Energy Data Management System (EDMS) which takes benefit of flexibilities to efficiently balance energy demand and supply. The EDMS consists of millions of heterogeneous nodes that each incorporates advanced components (e.g., aggregation, forecasting, scheduling, negotiation). We describe each of these components and their interaction. Preliminary experimental results confirm the feasibility of our EDMS.

Aggregating energy flexibilities under constraints

“…T (f ) = [t es , t ls ] where t es and t ls are the earliest start time and latest start time, respectively. The amount profile is a sequence of (m ∈ N >0 ) consecutive slices, P (f ) = s (1) Figure 2 illustrates FO f = ( [1,5], [3,5], [2,3] An FO captures all possible amount demands and/or supplies of a device for a given time horizon. However, during the scheduling process, an FO is assigned to a specific amount at a specific time resulting in an assignment of the FO defined as follows: Definition 2.…”

“…The starting time of the first slice of the assignment must be within the start time flexibility interval of the FO, i.e., f.t es ≤ as f.s (1) .t s ≤ f.t ls . Each slice of the assignment has an amount value in the range of the corresponding slice of the FO, i.e., f.s…”

“…Moreover, we see that the aggregation result (f a 12 last row column a) of SA does not enable an assignment that respects the constraint. When scheduling is applied on f Figure 3b) that contains assignments which respect the constraint, e.g., as f b 12 = (2, 2), (3,1) . In this paper, we evaluate an aggregation result through the objectives of constraint-based aggregation.…”

“…In our work, we model flexible demand/supply devices (referred to as loads for simplification) using the flex-offer (FO) concept [1]. An FO explicitly captures the flexibility in energy and time of a load, as presented in the following example.…”

Real-Time Business Intelligence in the MIRABEL Smart Grid System

“…Simultaneously, execution deadlines of the previously received flex-offers are approaching and thus their respective individual schedules (assignments) have to be prepared and distributed back to the original issuers of the flex-offers. When aggregating those flex-offers, a number of requirements have to be satisfied [9,11]:…”