Abstract
The smart-grid era is characterized by a progressive penetration of distributed energy resources into the power systems. To ensure the safe operation of the system, it is necessary to evaluate the interactions that those devices and their associated control algorithms have between themselves and the pre-existing network. In this regard, Hardware-in-the-Loop (HIL) testing approaches are a necessary step before integrating new devices into the actual network. However, HIL is a device-oriented testing approach with some limitations, particularly considering the possible impact that the device under test may have in the power system. This paper proposes the Power System Hardware-in-the-Loop (PSHIL) concept, which widens the focus from a device- to a system-oriented testing approach. Under this perspective, it is possible to evaluate holistically the impact of a given technology over the power system, considering all of its power and control components. This paper describes in detail the PSHIL architecture and its main hardware and software components. Three application examples, using the infrastructure available in the electrical engineering laboratory of the University of Sevilla, are included, remarking the new possibilities and benefits of using PSHIL with respect to previous approaches.
Highlights
The power system is undergoing a revolution nowadays, with the fast evolution of new hardware and software technologies
The power amplifier is in charge of imposing the voltage at the point of common coupling with the Device Under Test (DUT), which is computed by the Real-Time Control System (RTCS) considering its reaction
In order to overcome these shortcomings, this paper proposes to extend the Power HIL (PHIL) approach by: (i) introducing the algorithms determining the DUT setpoints, i.e., Algorithm Under Test (AUT); (ii) expanding the test focus from the current device-oriented approach to a system-oriented concept including the impact of the tested technology on the power system
Summary
The power system is undergoing a revolution nowadays, with the fast evolution of new hardware and software technologies. It is possible, to move a step forward towards the reality by incorporating power components in the tests using a PHIL approach. The power amplifier is in charge of imposing the voltage at the point of common coupling with the DUT, which is computed by the RTCS considering its reaction For this purpose, it is required to feedback the DUT injected current in the real-time simulated power system by using adequate analog/digital input/output ports [14,15,16,17,18,19]. The paper closes with the main conclusions and future lines of research
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