On-line decision-making method for distribution network black-start recovery based on dynamic programming model

Abstract

The invention discloses a distribution network island black-start recovery on-line type decision-making method based on a dynamic programming model. A diesel generator and energy storage are used as the black-start primary power supply to establish stable voltage and frequency, and the control method of energy storage can be switched. The input sequence of distributed type power supply and load can be made by the dynamic programming model, in which the energy storage battery is equally depreciated as a utility function. The rapid compensation of new power can be realized through the energy storage system having PQ control.

Description

Technical field [0001] The invention relates to the field of distribution network control, in particular to an online decision-making method for black start recovery of a distribution network island based on a dynamic programming model. Background technique [0002] With the rapid economic development, the society's dependence on power supply continues to increase, and the consequences of blackouts are becoming more and more serious. In order to reduce the time of power outages and the economic losses caused by power outages, the study of fast, efficient and reliable black start decision-making is of great significance to the safe and stable operation of the distribution network. The random uncertainty of the output of the distribution network containing DG (Distributed generation) makes it difficult to control the stability of the black-start recovery process of the distribution network island. A reliable and economical black-start recovery plan is for the overall economy and st...

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Problems solved by technology

[0003] At present, the main focus of the black start decision-making research on distribution network islands is the line recovery time and power quality, but for the black start research of the distribution network containing DG, the black start plan is only developed by comparing the electrical quantity indicators after offline simulation.

At the same time, the current research does not consider the economic indicators of energy storage in the black start process.

After searching the literature of the existing technology, it is found that the Chinese invention patent (application number: 201510706102.X) proposes a method for restoring power supply and black start in an active distribution network island, and establishes a dynamic programming model through the island status index to formulate a black start recovery sequence. This method is only considered in terms of stability, without considering the economics of operation

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