Abstract
Multi-frequency oscillation is a new type of electromagnetic oscillation issue in power systems caused by the increasing penetration of renewable power and power electronic devices. This study investigates the risks and influencing factors of multi-frequency oscillation in a prosumer power network where a variety of converter-based resources exists. For the feasibility of analysis, the internal and external stability of the study system are defined and analyzed based on sequence impedance models. Analysis results show the impacts of control parameters of prosumers, length of cables, transformer ratios, local grid strength, and power and capacity of prosumers on the risks of oscillation. Accordingly, despite the poorly tuned control parameters, the study system has higher risks of multi-frequency oscillation with longer cables, lower-rated voltage of cables, larger capacity, and inductive power consumption of the neighboring prosumers. Frequency-domain analysis results are demonstrated by EMTDC/PSCAD simulations.
Highlights
In recent years, problems of multi-frequency oscillation have been raised by the increasing penetration of renewables and power electronics
Simulation results are in agreement with the frequency domain analysis in Section 4, which demonstrate that the oscillation risks are raised in a prosumer power network at lower-rated voltage
This article has studied the multi-frequency oscillation stability in a prosumer power network consisting of converter-based resources (PV power station, energy storage, EV charging station, etc.) based on sequence impedance models
Summary
Problems of multi-frequency oscillation have been raised by the increasing penetration of renewables and power electronics. This article studies the risks of multi-frequency oscillation in a prosumer power network where different converter-based resources are closely integrated. A modern prosumer power network is heavily dependent on the stable operation of a variety of converter-based resources, including distributed renewable generation, energy storage, bidirectional EV charging, controllable loads, and more. Different types and applications of a family of elastic load demand control technologies called electric springs have been comprehensively discussed, which enhance the power quality and system stability in a renewable-penetrated power network (Wang M. et al, 2021). With the increasing penetration of converters in a prosumer power network, the risks of multi-frequency oscillation are continuously raised and need to be assessed in details
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