Concepts for a DC network in industrial production

Abstract

In this paper, concepts for an extended DC network for the main power supply of components from various manufacturers in industrial production are presented. In the first part, detailed requirements for such a network are given from the viewpoint of a customer. Based on those, different concepts for AC/DC conversion and energy management are discussed. As far as AC/DC conversion is concerned, the advantages and drawbacks of several rectifier topologies are listed, as they have a significant impact on the system behavior and EMC properties. An intelligent energy management can improve the energy efficiency and reduce downtimes of a plant, which are major requirements from a customer's viewpoint

Impact of photovoltaic technology and feeder voltage level on the efficiency of façade building-integrated photovoltaic systems

“…The more electric aircraft will work with a bipolar DC bus of 270 V [18]. Borcherding et al considered a 650 V bus for industrial applications [19]. In the Netherlands, the use of a bipolar 350 V bus is preferred [20] whereas datacenters employ a bipolar 190 V DC bus [10].…”

Load Profile Cycle Recognition for Industrial DC Microgrids with Energy Storage Systems

“…Thus, the droop curve control could lead to an uncontrolled SoC. On the other hand, flexibility requirements for industrial DC microgrids like connecting or disconnecting grid participants at runtime [4] is also challenging. The different number of participants can result in a wide range of workload situations for the DC microgrid.…”

“…The different number of participants can result in a wide range of workload situations for the DC microgrid. For this reason, many works [3], [4], [11], [12], propose adaptive droop curve controls with an additional communication link to a superior control unit like a PLC. Even though, this approach requires additional cabling effort and increases complexity due to additional hard-and software, many works use adaptive droop control due to its flexibility [10], [13]- [16].…”

“…With adapted droop curves the energy distribution between the source is updated. Due to the required flexibility of industrial DC microgrids [4] the connecting or disconnecting of consumers change the cyclic load profile slightly during operation. For this reason, the cycle recognition and online adaptation have to be executed repetitively, to respond on such changes.…”

“…In industrial context DC microgrids are supposed to increase the usage of recuperation energy and to reduce conversion losses. Imbalances of the energy supply and demand can be better compensated with DC microgrids than with state of the art alternating current (AC) technology [4]. A crucial point for DC microgrids is the use of energy storage systems (ESS), which ensure a balance between energy supply and demand within the microgrid [5], [6].…”