A distributed voltage stability control method for integrated transmission and distribution grids

While a large amount of distributed generators (DGs) were integrated into the distribution grid, the transmission grid voltage stability assessment (VSA) had not been suitable to be solved independently. A distributed voltage stability control (DVSC) method for integrated transmission and distribution (T&D) grids was proposed in this paper. The objective function aims to minimize the total control costs of the transmission and distribution grids. The boundary influence factors composed by the dual multipliers are introduced to coordinate the TN VSC sub-problem and DN VSC sub-problem. Those optimal power flow algorithms, by which provide the dual multipliers are generated, are adopted in both TN and DN VSC sub-problems. The equivalent power, the influence factors and the boundary bus voltages are exchanged between the transmission and distribution grids to realize distributed computation. Simulation results on integrated IEEE30 buses transmission and IEEE33 buses distribution system show that the proposed method is effective.

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