A multi-type power supply grid-connected constant volume method and device

Abstract

The invention provides a grid-connected constant volume method and device for multiple types of power supplies, and the method comprises the steps: determining the cumulative probability of the shutdown capacities of the multiple types of power supplies, and further determining the grid-connected capacities and access positions of the multiple types of power supplies; the multi-type power suppliescomprise a small hydropower station, a wind power station and a photovoltaic power station. According to the invention, the output complementarity among multiple types of power supplies is considered; the outage capacity cumulative probability of multiple types of power supplies is associated with the reliability cost of the power distribution network; the reliability cost and the network loss annual cost of the power distribution network are optimized, the reliability of the power distribution network after grid connection of multiple types of power supplies is improved, and the grid connection cost of the multiple types of power supplies is reduced. According to the technical scheme provided by the invention, a relatively optimal multi-type power supply access strategy can be obtained,the sum of the annual loss cost and the reliability cost of the power distribution network is reduced to the minimum, and meanwhile, the power quality and the power supply reliability of the whole power distribution network can be ensured.

Description

technical field [0001] The invention relates to the field of new energy technologies, in particular to a method and device for multi-type power grid-connected and constant-capacity. Background technique [0002] With the increasingly serious problems of energy and environment, more and more distributed new energy sources are connected to the power grid. While the access of distributed new energy brings benefits such as pollution-free and mutual independence, there are also such Voltage limit, harmonic pollution and other problems, therefore, it is necessary to optimize the access of distributed new energy to ensure the reliability of power supply and obtain the maximum economic benefits. At the same time, due to the various types of distributed new energy sources, the output characteristics are also different. When different distributed new energy sources are connected to the same distribution network at the same time, there will be correlation and complementarity between di...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the disadvantages of low reliability of the distribution network and high cost of multi-type power grid-connection caused by the neglect of small hydropower stations in the prior art, the present invention provides a multi-type power grid-connection constant capacity method And the device, according to the probability density function of multi-type power output, determine the cumulative probability of multi-type power outage capacity; through the pre-built multi-type power grid-connected constant capacity model, determine the multi-type power grid-connected capacity and access location; The multi-type power grid-connected fixed-capacity model includes an objective function and constraint conditions constructed with the goal of minimizing the sum of reliability costs and network loss costs for multi-type power sources connected to the distribution network. The reliability cost of the distribution network Determine according to the cumulative probability of multi-type power supply outage capacity; the multi-type power supply includes small hydropower stations, wind power stations and photovoltaic power stations. The cumulative probability of outage capacity of multiple types of power sources, including small hydropower stations, is linked to the reliability cost of the distribution network, and a distribution network reliability that optimizes the reliability cost of the distribution network and the annual cost of network loss is proposed. The cost and annual cost of network loss improve the reliability of the distribution network after multi-type power sources are connected to the grid, and reduce the cost of multi-type power sources.

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