Abstract
A robust and reliable grid is one of the core elements for power network planning. Specifically, splitting is an effective way for power grid out-of-step oscillation. Since the cross-section of system out-of-step is mostly found on the weak connection lines, reducing the number of those lines can be conducive to the system partition, save the finding time of the optimal splitting cross-section, and improve the performance of the splitting control. This paper proposed an enhanced method based on slow coherence theory for weak connection lines’ identification and monitoring. The ratio of the number of weak connection lines to the number of all the lines, called weak connection coefficient, is considered as a crucial factor. A bi-level programming model, which perceives the minimum connection coefficient as the optimization goal, is built for the transmission network. Additionally, a fused algorithm, consisting of Boruvka algorithm and particle swarm optimization with adaptive mutation and inertia weight, is employed to solve the proposed method in the instances of an 18-node IEEE Graver system and a practical power grid in East China. Simulation results in PSD-BPA are conducted to verify the effectiveness of the weak connection monitoring method and transmission network planning model.
Highlights
A proper power network structure is the prerequisite for the safe operation of the power system and a reliable smart grid [1,2]
To deal with the increased risk of out‐of‐step oscillations between regions and improve the ability of interconnected power grid to resist failure risk, this paper proposes a two‐level planning model of transmission network considering splitting control, and obtains the following conclusions: Based on the modified cosine factor and graph theory, this paper proposes an improved method of identifying and screening the weak connection lines of the system, which can screen the weak connection lines more accurately and automatically, and does not rely on the judgment of the network topology
To deal with the increased risk of out-of-step oscillations between regions and improve the ability of interconnected power grid to resist failure risk, this paper proposes a two-level planning model of transmission network considering splitting control, and obtains the following conclusions:
Summary
A proper power network structure is the prerequisite for the safe operation of the power system and a reliable smart grid [1,2]. With the advent of the ultimate high voltage power transmission era in China, the power system is expanding to an unprecedented scale In this way, the intricated operation characteristics and cross-section out-of-step oscillations have placed challenges for the interconnected power grid [3,4]. Based on the multi-timescale slow coherence theory, this paper first analyzes the feasibility of splitting the weak connection lines in the system and proposes an improved method to identify and screen the weak connection lines in the system and a bi-level planning model of transmission network considering splitting control. The resulting planning Figure is verified in PSD-BPA, which proves the feasibility and effectiveness of this method
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