Presenters and Topics

 

A centralized protection and control system using a well proven transmission class relay
Presenter: Chee-Pinp Teoh | GE, UK
Abstract: The growing adoption of process bus and the desire for a digital substation is leading to a new interest in the concept of centralized protection and control, where all protection functions for a substation are combined into a single device. When considering implementations of this solution, it is important to remember that this device will be installed in a substation and must meet all the expected environmental and performance requirements for protective devices in substations. Importantly, a centralized protection device must be a technologically mature solution, robust and self-supervised platform, using proven protection algorithms, scalable for any substation size, on hardware capable of the expected 20-year service life. 
This presentation describes one specific actual implementation of such a system for distribution substations, based on an existing transmission class protection relay. This centralized distribution system takes advantages of features already developed for the transmission protection platform, including:

  • Proven protection algorithms for feeder, bus, and transformer protection
  • A robust cyber security implementation
  • Support for multiple SCADA protocols
  • Support for IEC 61850, including sampled values subscription
  • Numerous communications ports to support separate connections to station bus, process bus, and engineering networks simultaneously
  • Phasor Measurement Units function and the use of Routable GOOSE to provide inter-station events and control indications

Chee-Pinp Teoh is the Product Manager for GE Grid Solutions, based at Stafford UK. He is responsible for current differential and busbar differential application for GE MiCOM Px40 and UR Multilin relays.

Interoperability of Line Differential Protection 
Presenter: Jörg Blumschein | Siemens, AG Berlin, |Germany
Abstract: Line differential protection is used for a long time to protect overhead lines and cables of transmission and distribution systems. The basic principle of line differential protection is Kirchhoff’s current law. Due to this principle line differential protection is strictly selective to clear faults on the protected line. The presentation describes a real case how interoperability was achieved for line differential protection of different protection platforms of one manufacturer. The problems and limitations for this use case are explained in detail. In addition,  an implementation of line differential protection based on sampled measured values and GOOSE according to IEC61850 and IEC61869 will be presented. With this approach, the communication interface between the line differential protection devices becomes interoperable. More flexible solutions are found to be possible. For instance, a line differential scheme might consist of only one line differential relay, receiving sampled measured values from a merging unit located at the remote end. The trip command for the remote end might be transferred via GOOSE to the merging unit located at the remote end. For redundancy even two different line differential protection relays could be used feeding each other with the sampled measured values from the remote end.

Jörg Blumschein is a Principal Key Expert for Protection at Siemens in the development department of protection relays.

 

Power flow and protection in LVDC systems 
Presenter: Pavol Bauer |  Delft University of Technology, the Netherlands
Abstract:  The p
roblem of Power Flow Control in DC grids is firstly addressed  an the Power flow controller will be introduced. A zonal protection framework where the low voltage dc grid is partitioned according to short-circuit potential and provided degree of protection, and several known protection schemes that ensure selectivity, sensitivity and security will be discussed. These typically utilize pre-existing knowledge about the system’s components, employ a communication infrastructure or power down the system to ensure selectivity. A decentralized protection scheme for low voltage dc grids that is able to safely isolate only the faulted sections, without utilizing information about the system, communication or a shutdown is proposed. In fact, the decentralized protection scheme relies on minor modifications to the protection devices, while ensuring fast and cost-effective fault interruption by utilizing local measurements performed within the protection devices. Finally the design criteria of solid state circuit braker for LVDC grid protection is discussed.

Pavol Bauer is Professor at the Faculty of EEMCS, at Delft University of Technology and head of the DC grids and Systems group within the Electrical Sustainable Energy Department.

 

HVDC fault current interruption technology
Presenter:  René Peter Paul Smeets | KEMA Laboratories of DNV GL, the Netherlands 
Abstract: DC circuit breaker is an irreplaceable solution for fault current interruption. for successful HVDC grid protection, the interruption time of the fault current strongly depends on the capabilities of the applied DC circuit breakers. This presentation deals with the DC fault current origin and severity, technical principles and proposed solutions of fault current interruption. It also provides insight in the status of HVDC circuit breakers and the status of the HVDC grid projects with fault current interruption included.    

René Peter Paul Smeets is a service area and innovation leader of KEMA Laboratories of DNV GL.

 

Fast protection method for the meshed MTDC network with low sampling frequency requirement                                                                                                                         Presenter: Lian Liu | Delft University of Technology, the Netherlands

Abstract: HVDC technologies are widely acknowledged as a solution for the interconnection of renewable energy resources with the main electric power grid. The application of the latest modular multi-level converter (MMC) makes power conversion much more efficient. Due to the relatively low impedance in a DC system, DC fault currents may rise to an extremely high level in a short period of time, which can be very dangerous for HVDC converters. To improve the sustainability and security of electricity transmission, protection solutions for HVDC systems are being developed. Nevertheless, they have various drawbacks on fault signal detection and timely clearance. This presentation demonstrates a protection method that provides a fast and reliable solution addressing those drawbacks. A protection algorithm based on  travelling wave simulation and analysis is proposed to detect abrupt data series (outliers) of transient signals. The algorithm shows high efficiency, reliability, selectivity and has low sampling frequency requirements. The protection method has been validated through a cyber-physical simulation platform, developed using a real-time digital simulator (RTDS) and IEC 61850 communication links. The obtained results show that the proposed method has good potential for practical applications.

Lian Liu is with the Intelligent Electric Power Grid group at the Faculty of EEMCS, Delft University of Technology

Experience of protection for meshed DC Grid 
Presenter: Benjamin Marshall |  The National HVDC Centre, UK
Abstract: High Voltage Direct Current (HVDC) offshore grids based on voltage source converters are a key technology for integrating renewable energy generation and interconnecting different electricity networks. DC-side protection has been an ongoing challenge for realisation of multi-terminal HVDC grids. Through leading Work Package 9 of the PROMOTioN project we have worked towards demonstrating the IED performance using real-time simulation with hardware-in-the-loop tests based on simulation of an industrial HVDC grid. Hardware IED prototypes are used to implement fast DC protection algorithm(s) against a realistic HVDC network modelled in a real-time simulation (RTS) environment. The presentation will describe the real-time simulation setup used for the experimental demonstration; outline the requirements for integration of hardware IED prototypes with DCCBs modelled using the real time simulator; examine a protection design study for the partially selective strategy with DC circuit breakers; assess the performance of the proposed protection schemes; and analyse the viability of DC protection strategies implemented on the multi-terminal HVDC network. 

Ben Marshall is a an HVDC Technology Manager at the National HVDC Centre, UK  

 

Guidelines for the protection of power systems with high levels of renewables
Presenter: David Lopez | REE, Spain
Abstract: Since 2016, MIGRATE project Working Package 4, has been studying the impact of power electronics (PE) based generators in present protection systems. As a result of the previous research, innovative solutions have been proposed in order to improve the behavior of present protection systems, an analysis of the performance of currently available protection schemes and their applicability in this scenarios has been made and the different factors, related with the controls of the PE generators, with most impact in present protection devices have been evaluated.
 
During this presentation a summary of the results of the investigation carried out in MIGRATE project will be presented and guidelines for the protection of power systems with high penetration of PE based generators will be discussed.

 

David Lopez is a protection engineer at REE, working for the System Security Department.

 
Grid Connection of windfarms –  selection of the protection system – an offshore case
Presenter: Hugues Jacquesson | RTE, France
This presentation describes the approach of the engineers of RTE in charge of the protection of the transmission grid, in the framework of offshore projects. This approach takes into account some technical uncertainties, as well as the regulatory context which delimits RTE's activity.
 
Hugues Jacquesson is a senior protection engineer at RTE France in charge of protection schemes' definition for (E)HV.
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