Andreas Kubis

New applications for wide-area monitoring, protection and control

As operation of electrical transmission systems faces new challenges due to liberalization and integration of renewable energies, novel solutions for power system management are needed. At the same time, the development of smart grids also pushes high performance communication and information technology that contribute decisively in enabling a dynamic monitoring, protection and control of large-scale and wide-spread power systems. The potential offered by smart grids and new fast controllable power systems equipment needs to be exploited by development of valuable applications for power system operation. Moreover, first experiences with selected dedicated applications call for the design of an integrated wide-area monitoring, protection and control (WAMPAC) system. This paper presents recent progress of research unit FOR1511 in the development of WAMPAC applications for stability monitoring, protection schemes based on wide-area information, and real-time congestion management. The research unit aims at developing a coherentWAMPAC system taking into account interdependencies and synergies of newly developed applications and conventional local systems in place.

A Y-D Multifunction Balance Transformer-Based Power Quality Control System for Single-Phase Power Supply System

This paper proposes a Y-D multifunction balance transformer (YD-MFBT)-based power quality control system (MBT-PQCS) to deal with the power quality problems in the single-phase power system. The MBT-PQCS mainly consists of a YD-MFBT and a three-phase full-bridge converter (FBC). It fully explores the inherent negative sequence current (NSC) suppressing the ability of YD-MFBT, which makes the power flow transformed by FBC less than that of the conventional transformer-based compensating system. In addition, since the YD-MFBT exits three-phase output ports in relatively low-voltage level, FBC can directly connect with the main transformer via the output ports, without using the auxiliary step-down transformer. Therefore, the initial investment cost, installing difficulties and covering space of the whole compensating system, can be reduced significantly. In this paper, the current transforming relationship and the compensating principle of MBT-PQCS are presented, and the detection and control methods are given as well. Both the simulation and the experiment are used to verify the effectiveness of the proposed system.

Validation of ICT-based protection and control applications in electric power systems

The use of Information and Communication Technology (ICT)-based power system applications increases continually which poses new engineering challenges regarding the development, validation and management of both - the applications and the intertwined infrastructures. In this paper the need for a joint analysis of power and ICT systems for evaluating smart grid applications is discussed and a systematic validation approach is proposed. After reviewing state of the art validation techniques, a newly developed Wide-Area Monitoring, Protection and Control (WAMPAC) system is introduced. Its extensive use of wide-area communication and the combination of centralized and decentralized decision making stress the complexity of such a cyber-physical system, where the interdependency between the power system and the ICT domains are challenging to validate. Deduced from these requirements, a validation concept is proposed that comprises (i) the usage of a comprehensive smart grid reference model, (ii) a systematic and objectively verifiable generation of scenarios, and (iii) a single and multi-domain validation process using analytical, simulative and experimental techniques. For the latter, a composition of analyses using co-simulation, Hardware-in-the-Loop (HiL) simulations and an empirical test bed is outlined.

Poster Abstract: vGridLab—a testbed for virtualized smart grids

AbstractvGridLab, a testbed aiming at the development, deployment and validation of virtualized smart grid functions is presented. The environment enables the evaluation of the functional aspects of virtualized smart grid applications as well as the non-functional characteristics of the underlying information and communication technology. We provide an overview of the vGridLab architecture, elucidate the components required to set up an adequate evaluation environment for virtualized smart grid functions and describe the characteristics that can be obtained using the testbed.

A wye-delta multi-function balance transformer based power quality control system for single-phase power supply system

This paper proposed a wye-delta multi-function balance transformer based power quality control system (MBT-PQCS) to deal with the power quality problems in the single-phase power supply system. MBT-PQCS is mainly consists of a wye-delta multi-function balance transformer (YD-MFBT) and a three-phase full-bridge converter (FBC). It fully explores the inherent negative sequence current (NSC) suppressing ability of YD-MFBT, which makes the active power transformed by FBC is less than that of conventional transformer based compensating system. On the other hand, because YD-MFBT exits an interface for connection of active part, so FBC can be integrated with the main transformer without the help of other high-power auxiliary transformers. Hence the initial cost, installing difficulties, and covering space of the whole compensating system are reduced significantly. First, the current transforming relationship and compensating principle of MBT-PQCS are presented. Second, the detection and control methods are given as well. Finally, the simulation and experiment results verify the effectiveness of the proposed system.