BIDIRECTIONAL ENERGY MANAGEMENT INTERFACE (BEMI) FOR TECHNICAL AND ECONOMICAL INTEGRATION OF DER IN THE LOW VOLTAGE GRID COMMON TECHNICAL AND LEGAL INTERFACE FOR ENERGY MANAGEMENT

摘要

Currently decentralized electrical generation units (DG units) of small size are connected to the low voltage grid with an increasing number and generation capacity. The power fed into the grid by these devices is primarily determined by the maximum power installed and by the supply of primary energy. Support of grid operation is not possible because of the lack of observability and controllability of these generators in the low voltage level. Therefore a new strategy for the integration of DG units into grid operation will be required. This strategy must include energy management with controllable generators as well as controllable loads. In the concept presented in this work the point of common coupling (PCC), which acts as the technical as well as legal interface between grid operator on the one side and operator of the generator on the other side, is extended by a communication interface. This allows a technically efficient design of an energy management system and avoids fundamental organizational changes to the current grid regime. Technical and economical considerations for the design of such a bidirectional energy management interface as a new implementation of the PCC are presented finally.