RWTH

The infrastructure available at the ACS lab allows developping two main lines of simulations and demonstrations. On one side appropriate hardware and software components, as shown in Figure 20, facilitates real time simulation of multi physical systems and provide a platform for prototyping and Hardware In the Loop (HIL) and Power Hardware In the Loop (PHIL) testing of industrial products and applications. On the other a platform that incorporates RTDS, PMUs and SCADA systems permits to simulate accurately the properties of an industrial real time monitoring system for a electrical power network.

For real time power system simulation, the lab is equipped with Real Time Digital Simulator (RTDS) and eMEGAsim simulator from OPAL-RT. The installed RTDS is composed of 8 racks that can accurately and reliably simulate dynamics of power systems generally in the range of 50 µs which can also be brought down to 2µs in some special cases. Through its various output boards real time measurement data is made available in analog and digital formats for external devices. It also can send measurement data using the network protocols via Ethernet. The OPAL-RT simulator can simulate power system dynamics with time steps of 150ns and number of grid nodes in the range of simulation capacity of the RTDS installation.

For the PHIL the lab is equipped with Flexible Power Simulator (FLePS) flexible electrical port to HIL and especially PHIL testing. This interface can be used in the laboratories to test small apparatuses (less than 20 kW). The lab is also equipped with Network emulator based on standard PC architecture and open-source Wide Area Network Emulator (WANem) software for emulating communication network characteristics. This enables a joint simulation of power system with communication infrastructure in order to analyze the interactions and interdependence between the two systems.

The ACS monitoring platform can be functionally divided into three main parts namely the Real Time Simulation of Power Systems, Phasor Measurement Acquisition System and the Software Platform that enables the development of monitoring and control applications. The platform emulates the measurement system of real-world power grid thus enabling the testing of advance monitoring and control applications. The scheme of the proposed monitoring platform is shown in Figure 21.

For advance monitoring application development the lab has acquired 4 commercial Phasor Measurement Units (PMUs) from Alstom and built a prototype PMU based on NI CompactRIO (NIcRIO). The ALSTOM PMUs are equipped to receive one 3-phase voltage and four 3-phase currents through its input transformers board and generate synchrophasors based on the IEEE C37.118-2005 standard. The NIcRIO PMU is able to generate dynamic phasors abiding to the IEEE C37 118 2011 standard. Based on the open source software OpenPDC, Phasor Data Concentrator (PDC) and hierarchy of the PDCs is implemented. For implementing the SCADA Kepware and King SCADA software are used.

Such platform and equipments will be used in the demonstration phase of IDE4L project in order to simulate accurately the power system, and test the real time monitoring infrastructure and monitoring applications, such as state estimation. Control signals can be delivered to controllers, such as simulated inverters or intelligent electronic devices, in the simulation environment in RTDS or OPAL, with industrial protocols, through emulated communication infrastructure, hence investing als othe effects of delays. Moreover, this condition can be tested under several scenatios, e.g. high power generation from photovoltaic systems, faulty conditions and unbalances. The accurate simulation of power system dynamics allow also to test fault location isolation and service restoration algorithms and devices.