A method for configuring system capacity of optical storage microgrid

Abstract

A method for configuring system capacity of an optical storage microgrid includes a method for capacity allocation of photovoltaic power generation system and energy storage system. At first, accord to that application situation of the micro-grid system and the grid situation, the invention determines that the micro-grid system is an independent micro-grid system or a grid-connected micro-grid system, and then different capacity configuration target are respectively formulated according to the characteristics of the independent optical storage micro-grid system and the grid-connected optical storage micro-grid system. Stability and reliability are the main considerations for stand-alone microgrid systems, For grid-connected micro-grid system, the economy is mainly considered, and the capacity allocation of energy storage system is carried out under four economic operation modes: photovoltaic system and economy mode based on peak-clipping and valley-filling, two-part electricity price economy mode, auxiliary service economy mode and demand-side response economy mode. The invention can ensure that the capacity of the independent optical storage microgrid system meets the stable and reliable operation condition, and the capacity of the grid-connected optical storage microgrid system meets the economic operation condition.

Description

technical field [0001] The invention relates to a method for configuring the capacity of an optical storage microgrid system. Background technique [0002] With the large-scale application of distributed energy, due to its intermittent and fluctuating characteristics, the impact on the power grid cannot be ignored. The emergence of microgrids has solved the contradiction between distributed energy sources and power grids well, making the output power of distributed energy sources controllable and effectively suppressing rapid power fluctuations. Microgrid systems that are grid-friendly and can operate flexibly in grid-connected and off-grid systems are becoming more and more widely used. The microgrid system is composed of distributed power sources, power loads, monitoring, protection and automation devices, and includes energy storage devices when necessary. It is a small power supply system that can basically achieve internal power balance. [0003] Microgrid systems are...

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Problems solved by technology

[0004] For the independent micro-grid system, the paper "Multi-objective optimization planning and design method for independent micro-grid system" published by Guo Li et al. in the Chinese Journal of Electrical Engineering on February 5, 2014 proposed a multi-objective optimization method and a genetic algorithm to determine the system capacity. The optimization solution, but its calculation process is complicated, and the fluctuation of conditions during the actual operation of the project will lead to large errors in the calculation results

For the grid-connected micro-grid system, patent 201510254034.8 proposes a dynamic optimization method for the energy storage capacity of the optical-storage micro-grid system, that is, to adjust the ratio of the energy storage reserve capacity to the smooth fluctuation capacity according to the photovoltaic and load power predictions, which is essentially a method of optimizing the energy storage capacity of the optical-storage micro-grid system. For the operation and management of energy storage after system capacity configuration, some other patents and papers mainly consider the backup capacity when the grid fails and the friendly power control of the tie line for the capacity configuration of the grid-connected micro-grid system, and do not target different applications. Scenario proposes capacity allocation methods for different economic models

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