Abstract
Maintaining a synchronous state of generators is of central importance to the normal operation of power grids, in which many networks are generally interconnected. In order to understand the condition under which the stability can be optimized, it is important to relate network stability with feedback control strategies as well as network structure. Here, we present a stability analysis on a multi-area power grid by relating it with several control strategies and topological design of network structure. We clarify the minimal feedback gain in the self-feedback control, and build the optimal communication network for the local and global control strategies. Finally, we consider relationship between the interconnection pattern and the synchronization stability; by optimizing the network interlinks, the obtained network shows better synchronization stability than the original network does, in particular, at a high power demand. Our analysis shows that interlinks between spatially distant nodes will improve the synchronization stability. The results seem unfeasible to be implemented in real systems but provide a potential guide for the design of stable power systems.
Highlights
Maintaining a synchronous state of generators is of central importance to the normal operation of power grids, in which many networks are generally interconnected
Based on the phenomena of multi-area power grid networks, we investigate the enhancement of the synchronization stability in terms of the control strategies and the topology design of network interlinks
Network topology can play a key role in the network synchronization
Summary
Maintaining a synchronous state of generators is of central importance to the normal operation of power grids, in which many networks are generally interconnected. We present a stability analysis on a multi-area power grid by relating it with several control strategies and topological design of network structure. By tuning the dynamical parameters such as the damping coefficients and the feedback gains, to match the network topology, the synchronization stability could be optimized. In order to maintain synchronization in a power grid, the operation is based on the controlled areas. Power grid networks are often composed of a number of areas, which are densely connected internally and weakly interconnected with each other This is because generators and loads are often spatially connected and the www.nature.com/scientificreports/
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