مبدل DC-DC خود تطبیقی بر اساس عامل جهت کنترل سیستم انرژی ترکیبی HES

ABSTRACT Agent-based self-adaptive DC-DC converter for hybrid energetic system control

The hybrid energetic system (HES) is generally an energy system operating simultaneously several sources with different capacities and proprieties. It is principally based on renewable energy sources (RES) and distributed generators DG. Their distributed production should meet an increasingly variable demand. The RES depend strongly on meteorological conditions, thereby they cannot be considered as a continuous energy supply and therefore behave as passive generator. To balance between consumption and generation the RES should be coupled with other sources and storage systems. Diversifying the energy sources is now a real issue. Hybridizing the RES with the storage system and DG as cogeneration system can meet the distributed production requirements allowing the RES intensive integration. The HES ensure a long-term energetic availability and it is able to deliver a subscribed power when the RES act as active generators. The HES can be shown as a supply system consisting of small distributed energy systems [1-2]. However, the DGs and the storage technologies life cycle should be respected. To take full advantages of the HES a distributed energy management (DEM) is necessary. It deals with the simultaneous operation of the different generators, the storage system and DGs constraints, and the variable load demand. Furthermore; other requirements should be satisfied in the DEM, as voltage limit control, the produced energy cost, the system effectiveness, the energy quality improvement, the energy flexible use and the environmental issue. Thanks to DEM, the HES can produce and consume effectively depending on the capacity of each generator and the loads’ needs.

The HES studied in this paper consists of PV generator and wind turbine as a RES and battery as storage technology system. This configuration can lead to prematurely lose battery life, because of the quickly battery charge and discharge. Many studies have dealt with the effective battery use [3-4]. Linking a hybrid generator to the RES and the battery as the Fuel cell (FC)-electrolyser combination generator is the HES suggested in this paper.

A custom role for power electronics is the development of HES, by meeting the distributed production constraints. Several studies have brought more interest to HES control containing DGs, RES and storage technologies. The Fuzzy logic and neural networks [5] were the subjects of many studies regarding the HES control, but the complexity and the difficulty in their implementation and comprehension can be their main inconvenient. Furthermore, these approaches can make the system non-scalable which conflicting with the distributed generation and therefore the future energy networks. This paper proposes a distributed energy management system based on the bus voltage control allowing simultaneously a flexible energy generation and consumption depending on the capacity of each generator and the variable demand by the bias of multi-agent system (MAS).

MAS is extensively suggested as a suitable approach to manage complex distributed systems with different capacities and different generation [6] such as HES. The goal of this paper is to introduce a self-adaptive DC-DC converter based on MAS paradigm.

The distributed energy management by MAS is given in section II and therefore the self-adaptive DC-DC converters are introduced. Section III meets the hybridization requirements by analysing the results of the HES control, section IV concludes the paper.