Abstract
Hybrid AC/DC distribution network (HADDN) will be the development trend of smart grid. This paper presents an optimal operation method for hybrid AC/DC distribution network to achieve safe and economic operation, in the case of uncertain renewable energy (RES) output and load demand. The proposed model is formulated based on a novel two-stage robust model. The first stage of the model optimizes the work states of the on-load tap changers (OLTC), capacitor banks (CBs) and energy storages (ESs) at one cycle. The second stage of the model optimizes the AC/DC converter stations (CSs) output to suppress the overvoltage problem and further reduce the operating cost by using corrective control policy. Furthermore, this paper adopts an ambiguity set to represent uncertainties of RESs and load demand, which makes the model less conservative and also shortens the model solving time. Then, the proposed model can be converted into the mixed integer second-order cone programming (MISCOP) problem, which can be solved by the delayed column-and-constraint generation algorithm. Finally, case study shows that this method can effectively realize safe and economic operation of the HADDN, which is obviously superior to other mainstream methods in reducing operation cost and restraining overvoltage problem.
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