Abstract
The modern power system is becoming more complicated due to the ever increasing penetration of power electronics, which is referred to as a power-electronics-dominated system (PEDS). In this case, the analysis, control, and operation of the entire power system should tone with the energy-paradigm transition pace, where the challenges should be properly tackled. After the brief introduction of grid-connected converters, this article explores stability challenges of PEDSs, especially on the low inertia issue and multitimescale characteristics, as well as the dynamics when connected to weak grids. The low inertia issue is considered as one of great challenges that power electronics introduce to the conventional power grid. Accordingly, the stability issues of PEDSs are discussed. The exploration reveals that the multitimescale coupling among various control loops and the mutual effects of multiple converters demand much more attention than ever before. The coordinated control of converters for the global stability of PEDSs is also summarized, part of which offers the possibility to solve the inertia problem. This article serves as an inspiration on potential solutions to these issues. In order to provide a more intuitive impression of the inertia problem in PEDSs, a case study is exemplified to highlight the analysis and discussion.
Highlights
T HE current energy network is being retrofitted with more renewable energy sources like wind and solar energy [1], [2]
Another method is the statespace model, of which the advantages include that the physical meaning of the model and the relationship between variables are clear, and the well-developed analysis tools based on the state-space theory can be used conveniently [56], [57]
Owing to the specialty of power electronic converters, the stability analysis methods used in multi-SG systems may not be directly applied in the power-electronics-dominated system (PEDS)
Summary
T HE current energy network is being retrofitted with more renewable energy sources like wind and solar energy [1], [2]. With this background and the continuous evolution of the energy paradigms, the modeling and dynamic analysis of PEDSs become more important than ever before. This ensures providing theoretical foundation and technological support for the cost-effective enhancement of the entire power system in terms of availability, stability, and reliability. Based on our previous study [24]–[26], focuses are put on the associated stability issues, including the virtual inertia characteristics, the interaction between the power converters and PENG et al.: ON THE STABILITY OF PEDSs: CHALLENGES AND POTENTIAL SOLUTIONS the ac grid, and the mutual effect among multiple converters.
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