Abstract
The penetration of power electronics into power generation and distribution systems has deepened in recent years, as prompted by the increasing use of renewable sources, the quest for higher performance in the control of power conversion, as well as the increasing influence of economic plans that necessitate power trading among different regions or clusters of power distribution. As a result of the increased use of power electronics for controlling power flows in power systems, interactions of power electronics systems and conventional synchronous machines’ dynamics would inevitably cause stability and robustness concerns, which can be readily understood by the coupling effects among interacting dynamical systems of varying stability margins (or transient performances). In this article, we present the various problems of power electronics penetration into power grids and the implications on the stability and robustness of power networks. We specifically attempt to bring together two distinct perspectives, namely, bottom-up (local) and top-down (global) perspectives, and examine the current progress and future direction of research in power systems amidst the extensive deployment of power electronics.
Highlights
S INCE the inception of the first power system at Godalming, England, in 1881, the power distribution network has grown rapidly in different parts of the world and has been playing an increasingly important role in many developed and developing economies
In the power system operated by the State Grid Corporation of China, for instance, 9.7% of electricity was generated by renewable energies and pumped into the grid through power electronics devices in 2018, with 10 UHVDC (Ultra High Voltage DC) transmission lines built for large-scale and remote electric power transmission among different areas covered by synchronous alternating current (AC) power [7]
Based on the models developed in either the time or frequency domain, standard approaches have been used for analyzing various stability problems in grid-connected converters, where the power grid is represented by a voltage source behind an inductance and conventional circuit analysis is adopted
Summary
S INCE the inception of the first power system at Godalming, England, in 1881, the power distribution network has grown rapidly in different parts of the world and has been playing an increasingly important role in many developed and developing economies. Based on the models developed in either the time or frequency domain, standard approaches have been used for analyzing various stability problems in grid-connected converters, where the power grid is represented by a voltage source behind an inductance and conventional circuit analysis is adopted. The main challenge in applying bifurcation analysis is the large number of parameters in a grid-connected system, as well as the many variables to be controlled, including power, frequency, voltage, current, phase angle, etc. Wu and Wang [57] analyzed the transient stability of grid-connected virtual synchronous generators, and proposed a mode-adaptive power-angle control method to avoid the loss of synchronization in the event of grid voltage disturbance. We will discuss the key challenges in the research of appropriate methods for assessing future power grid with extensive deployment of power electronics devices
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