Abstract
With a large number of renewable energy sources and DC-type loads entering the distribution network, the cost of inverter investment and system operation become high. By introducing a DC part into the traditional distribution network, the cost can be reduced. Also, it will be more convenient for new energy access. Nowadays, the main body of the distribution network is in AC form. Thus, it is impractical for whole grid DC retrofit. To analyze the optimal proportion of the DC part to be employed into the traditional distribution network, firstly, a bilevel optimization model is established to optimize the topology of the AC-DC distribution network. Secondly, in order to solve the bi-level optimization model, an improved GA algorithm, in which the Warshell algorithm is used to improve the convergence performance of the traditional GA algorithm, has been adopted. Finally, based on the bi-level optimization model, a multi-stage planning method of the distribution network is proposed, which reveals the dynamic topology evolution of the distribution network.
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