Multi-stage power supply recovery method for elastic power distribution network containing microgrid

Abstract

The invention discloses a multi-stage power supply recovery method for an elastic power distribution network containing a microgrid. A recovery strategy comprises a three-stage power supply recovery scheme of a microgrid recovery key load, a microgrid and emergency power supply vehicle cooperative recovery key load and a microgrid recovery non-key load. The established three-level recovery schemecan make the most of the electric energy supporting effect of the microgrid and the energy storage system on the power distribution network under major disasters, thereby improving the elasticity of the power distribution network. A former two-stage power supply recovery scheme is adopted to ensure that all key loads are recovered, and then the non-key loads are recovered to maximum degree as a target for starting the three-stage power supply recovery scheme. Finally, an established mixed integer linear programming model is solved to obtain the optimal power supply range of the microgrid in each time period, and an elasticity index of the power distribution network is calculated to evaluate the improvement degree of the method on the elasticity of the power distribution network. Accordingto the method, the elasticity of the power distribution network can be maximized while all key loads are recovered.

Description

technical field [0001] The invention relates to the field of distribution network fault recovery, in particular to a multi-level power supply recovery strategy for ensuring the elasticity of the distribution network. Background technique [0002] With global climate change, extreme weather disasters occur more and more frequently, resulting in frequent large-scale power outages, resulting in huge economic losses. As a key link directly serving users, the normal operation of the distribution network under extreme weather conditions is of great significance to ensuring people's production and life, resisting disaster accidents, and promoting social development. s concern. [0003] It is not uncommon for multiple failures, widespread power outages, lack of power, and weak transmission to occur under major disasters. A number of accidents around the world in recent years have highlighted the ill-preparedness and even the vulnerability of power systems to unpredictable extreme ...

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Problems solved by technology

For example, the occurrence of extreme events such as the Fukushima earthquake and tsunami in Japan, and the ice disaster in southern China in 2008 brought serious damage to the power system, resulting in large-scale and long-term power outages, which seriously affected the lives of residents and the power supply of loads.

[0004] Many existing distribution network fault recovery methods do not involve the resilience of the distribution network, but after a major disaster, it is particularly important to improve the ability of the distribution network to cope with low-frequency extreme events and restore the normal power supply state as soon as possible

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