AC and Dc mixed micro-grid operation optimization method based on time-domain rolling control

Abstract

The invention discloses an AC and Dc mixed micro-grid operation optimization method based on time-domain rolling control. The method comprises: (1) establishing an AC and DC mixed micro-grid linear model, (2) establishing a distributed power supply output prediction and AC and DC load prediction model, (3) establishing an optimization target function comprising robustness and economy performance, and selecting appropriate optimization targets according to different operation sates of grid-connected operation and off-grid operation of an AC and DC mixed micro-grid, (4) through adoption of a time-domain rolling control method, performing optimization control on a target power distribution network, and (5) performing the rolling time-domain control, and repeating the steps (2)-(4) at t+1 moment until the control ends. Influences brought by renewable energy output power, an energy price fluctuation and a load prediction error are eliminated trough feedback corrections, and, aiming at the different operation states of the AC and DC mixed micro-grid, the different optimization targets are adopted to improve the robustness in the off-grid operation state and the economy performance in the grid-connected operation state.

Description

technical field [0001] The invention relates to an energy optimization management method of an active distribution network, in particular to an operation optimization method of an AC / DC hybrid micro-grid based on time-domain rolling control. Background technique [0002] At present, the electric vehicle industry at home and abroad is developing rapidly, and the large-scale use of electric vehicles provides an opportunity to solve the problem of large fluctuations in distributed power output. However, a large number of charging and discharging of electric vehicles also brings many problems to the current distribution network dominated by AC structure. At present, the energy unit of electric vehicles mainly uses DC batteries. The charging of DC batteries connected to the grid will inevitably pass through inverters, and a large number of inverters connected to the grid will inevitably produce a large amount of harmonic pollution to the grid. At the same time, due to the chargin...

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Problems solved by technology

However, a large number of charging and discharging of electric vehicles also brings many problems to the current distribution network dominated by AC structure

At present, the energy unit of electric vehicles mainly uses DC batteries. The grid-connected charging of DC batteries will inevitably pass through inverters, and a large number of inverters will inevitably cause a large amount of harmonic pollution to the grid. At the same time, due to the charging of electric vehicle batteries The load is large and has strong randomness, which is not conducive to the safe dispatching operation of the power grid

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