Double-layer planning method for AC-DC hybrid distribution network considering n-1 safety criterion

Abstract

The invention discloses a two-layer planning method for AC-DC hybrid distribution network considering N-1 safety criterion, including the following steps: 1) initializing the genetic algorithm, and randomly constructing the DC grid structure; Consider the lower-level optimization model of the N-1 safety criterion; 3) Solve the lower-level model to check whether there is wind and light abandonment; 4) Based on the qualified DC grid structure, construct the upper-level AC system planning model that matches the DC grid structure; 5) Solve the upper model and judge whether it meets the upper limit of the genetic algorithm iteration. The present invention considers the N-1 safety criterion of the DC distribution network on the basis of the planning model of the AC-DC hybrid distribution network, and improves its operation reliability and flexibility while ensuring the planning economy of the AC-DC distribution network. It provides important guidance and assistance for the planning scheme of the AC-DC hybrid distribution network.

Description

Technical field[0001]In the field of distribution network planning of the present invention, in particular, there is a double-layer planning method for a binary mixing distribution network considering N-1 safety criteria.Background technique[0002]Due to the large number of renewable energy and concentrated in remote areas or coastal areas, the center is far from the load center, and with the continuous improvement of renewable energy permeability, a new distribution network planning method is needed. Considering the volatility and intermittentness of renewable energy, traditional communication distribution networks often have difficult to avoid abandonment of light. At present, the DC mixed distribution network has benefited from its greater transmission capacity, smaller line losses, and higher renewable energy penetration, has become an effective method for solving renewable energy access power systems. In addition, N-1 security guidelines are one of the important indicators of po...

AI Technical Summary

Problems solved by technology

Some scholars have proposed a model of AC and DC planning at the microgrid level, but the proposed model does not consider the planning scheme of the grid structure and cannot solve practical problems

On the other hand, although the N-1 safety criterion has been studied in detail in terms of unit combination optimization or large power grid planning, it has not been considered in the field of AC-DC hybrid planning

Moreover, for the problem that the complexity of the model is greatly increased after considering the N-1 safety criterion, and the bilevel programming problem is difficult to solve directly, there is no ideal solution method at home and abroad.

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