Analytical calculation method of probabilistic power flow for isolated island microgrid

Abstract

The invention provides an island micro power grid probabilistic load flow analytic calculation method. The calculation method is provided for calculating an operation state of an island micro power grid including intermittent DG such as photovoltaic electricity, wind power and the like; loads of the island micro power grid fluctuates randomly. A conventional island micro power grid steady state load flow analysis method is mainly based on load flow calculation, a load flow result of only a single operation point can be obtained, research on probabilistic load flow calculation is only based ona simulation method which requires computational statistics on a large amount of samples so as to obtain a probabilistic load flow result, online analysis can be adversely affected due to long computation time, and correlation of DG contribution in the micro power grid is mostly not taken into consideration. To overcome the above limitations, the invention provides the island micro power grid probabilistic load flow analytic calculation method via which rapid island micro power grid probabilistic load flow calculation can be realized, requirements for engineering accuracy can be met, and the method disclosed in the invention can be used for on-line analytical application.

Description

technical field [0001] The invention belongs to the field of steady-state analysis of isolated island microgrids, and in particular relates to a probabilistic power flow analysis and calculation method for isolated island microgrids. Background technique [0002] Microgrid (MG) provides technical means for the comprehensive utilization of renewable energy. According to whether it is electrically connected to the main grid, it can be divided into grid-connected type and island type. Among them, the island-type micro grid lacks the main grid due to no balance nodes. Support, usually adopts a peer-to-peer control method, that is, distributed generators (distributed generators, DGs), energy storage devices (energy storage, ES), static var generators (STATCOMs), etc. frequency and voltage regulation. [0003] The power flow calculation of the island microgrid is the basis for the planning, operation analysis, and optimal scheduling of the island microgrid. At present, there are ...

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Problems solved by technology

At present, there are literatures based on the semi-invariant method to solve the island microgrid PLF under the master-slave control mode. During the calculation, the diesel generator is regarded as a balance node, and the energy storage is regarded as a constant power load, which is similar to the traditional power system probabilistic power flow calculation. Considering the operation characteristics of island microgrid under peer-to-peer control mode

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