Abstract
With the development of higher-voltage power grids, the high- and low-voltage parallel loops are emerging, which lead to energy losses and even threaten the security and stability of power systems. The multi-infeed high-voltage direct current (HVDC) configurations widely appearing in AC/DC interconnected power systems make this situation even worse. Aimed at energy saving and system security, a decision optimization method for power grid operating conditions with high- and low-voltage parallel loops is proposed in this paper. Firstly, considering hub substation distribution and power grid structure, parallel loop opening schemes are generated with GN (Girvan-Newman) algorithms. Then, candidate opening schemes are preliminarily selected from all these generated schemes based on a filtering index. Finally, with the influence on power system security, stability and operation economy in consideration, an evaluation model for candidate opening schemes is founded based on analytic hierarchy process (AHP). And a fuzzy evaluation algorithm is used to find the optimal scheme. Simulation results of a New England 39-bus system and an actual power system validate the effectiveness and superiority of this proposed method.
Highlights
The high and low-voltage parallel loop is a kind of power grid structure, in which transmission lines of different voltage levels are looped by transformers at the sending and receiving ends
In order to evaluate the influence of opening schemes on system stability in multi-infeed high-voltage direct current (HVDC) configurations, the evaluation index must be defined based on multi-infeed short-circuit ratio (MISCR)
With the development of higher-voltage power grids, the high- and low-voltage parallel loops are emerging, which lead to energy losses and even threaten the security and stability of power systems
Summary
The high and low-voltage parallel loop is a kind of power grid structure, in which transmission lines of different voltage levels are looped by transformers at the sending and receiving ends. A line switching optimization method considering bus voltage constraint is proposed in [14], which could effectively eliminate over-limited power flows. The evaluation of opening schemes should consider static security, transient stability, short circuit current and operation economy of power systems. Due to intensive loads in a relatively narrow region, several HVDC (high-voltage direct current) inverter stations would emerge in adjacent areas of the same AC power grid, called the multi-infeed HVDC configuration In this situation, switching transmission lines, on the one hand, would decrease short circuit current, and, on the other hand, would stretch the electrical distance between different HVDC inverter stations. Simulation results validate the effectiveness and superiority of this proposed method
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