Abstract
In the transient process of the grid-connected converter (GCC), the existing research mainly focuses on the impact of the control loops. Little attention is paid to the transient stability issues driven by the imbalance between the input power and output power of GCC. This paper shows that the transient stability issues will still exist even if ignoring the dynamics of phase-locked loop (PLL) and current loop. In this paper, the models of the AC grid and the GCC are built under the assumption that the dynamics of the PLL and current loop are ignored. Then, by analyzing the transient process of GCC under non-severe remote voltage sag, the effects of the imbalance power on the transient stability of GCC are discussed. Moreover, for the GCC to operate stably after the transient process, there should be a maximum input power limit (MIPL) for GCC, and the imbalance power equation is applied in this paper to determine the transient stability of GCC. Furthermore, the effects of the current limitation on the transient stability of the GCC are also discussed. Finally, the theoretical analysis has been verified by means of simulations.
Highlights
Roncero-SanchezWith increasing environmental problems and a severe energy crisis, the proportion of renewable energy in the power system is increasing each year
In some places of the world, such as in China, these renewable energy resources are usually located in remote areas, which leads to grid-connected converter (GCC) connected to a weak AC grid
The full-order models of the GCC applied in these papers are complex. When these kinds of models are applied to analyze the transient stability of GCC, the analysis process becomes very complicated and it is not easy to figure out the key influence factors on these transient stability issues
Summary
With increasing environmental problems and a severe energy crisis, the proportion of renewable energy in the power system is increasing each year. The current limitation, which is being introduced in GCC to protect the switching devices from being damaged by the overcurrent, have effects on the transient stability of GCC [13,14,15] These previous studies above mainly focus on the influence of the PLL and the current loop [16,17]. The full-order models of the GCC applied in these papers are complex When these kinds of models are applied to analyze the transient stability of GCC, the analysis process becomes very complicated and it is not easy to figure out the key influence factors on these transient stability issues. The current limitation will have some influence on the transient stability of GCC since the current limiter will some influence the transient stability of GCC since the limiter will will havehave some effects on theon imbalance power It is discussed in current this paper.
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