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The high penetration of photovoltaic (PV) distributed energy resources (DER) facilitates the need for today's systems to provide grid support functions and ride-through voltage and frequency events to minimize the adverse impacts on the distribution power system. These new capabilities and its requirements have created concerns that autonomous unin...
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... implementation of the test matrix shown in Table 1 provides an automated configuration of the simulated loads. Figure 5 shows the graphical user interface (GUI) displaying monitored voltage and currents at vital circuit nodes, adjustment knobs to resistive, inductive and capacitive loads, and a test selector knob that transitions from any of the 10 tests in Table 1. The EUT capacity and operating voltage determines the load impedance for each of the tests in the UI test matrix and the PHIL GUI provides the Pgen/Pload ratio and Q factor. ...
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With increasing changes in the contemporary energy system, it becomes essential to test the autonomous control strategies for distributed energy resources in a controlled environment to investigate power grid stability. Power hardware-in-the-loop (PHIL) concept is an efficient approach for such evaluations in which a virtually simulated power grid...
Citations
... GSFs provide a benefit to both grid voltage and frequency stability while at the same time reducing the need of costly grid upgrades [1], [2]. However, GSFs can cause deviation in voltage and frequency during ride-through operations [3]. Also, variation in voltage and frequency during the ride-through process can make islanding detection more difficult for PV inverters. ...
Due to the increased penetration in Distributed Energy Resources (DERs), especially in Photovoltaic (PV) systems, voltage and frequency regulation has become a topic of interest. Utilities have been requesting DER voltage and frequency support for almost two decades. Their request was addressed by standards such as the IEEE Std 1547-2018. With the continuous improvements in inverters’ ability to control their output voltage, power, and frequency, a group of advanced techniques to support the grid is now required by the interconnection standard. These techniques are known as Grid Support Functions (GSF), and they allow the inverter to provide voltage and frequency support to the grid as well as the ability to ride-through abnormal events. Understanding how a GSF behaves is challenging, especially when multiple GSFs are combined to help the utility to control the system voltage and frequency. This paper evaluates the effects of GSF’s on the IEEE Std 1547.1-2020 Unintentional Islanding Test 5B by comparing simulation results from a developed PV inverter model and experimental results from a Power Hardware-in-the-Loop platform.
... B test conditions through a Human Machine Interface (HMI) platform. Implementing a variable RLC load using a Real-Time Simulation (RTS) software combined with PHIL techniques eliminates the need for costly, bulky, and heat-generating RLC elements [5]. Finetuning the impedances of a physical RLC element could be challenging. ...
Photovoltaic (PV) inverters connected to electrical grids are required to detect and respond to Unintentional Islanding (UI) conditions appropriately. The IEEE Std 1547.1-2020 specifies test procedures, based on resonant parallel RLC loads, to evaluate the ability of PV inverters to detect and disconnect under UI conditions. This paper proposes a prototype Power Hardware-in-the-Loop (PHIL) UI testing console with a Human Machine Interphase (HMI) and a virtual RLC load to evaluate the IEEE Std 1547.1-2020 UI Cat. B tests. Traditional UI testing procedures rely on physical RLC elements, which are potentially expensive, large, and heat-generating sources. Using PHIL techniques, the UI test procedure itself, and the RLC load were implemented virtually within a simulation environment. The virtual console could potentially reduce testing costs, decrease execution time and pave the way for automated testing. This paper presents promising preliminary results from the virtual console prototype.
