A new energy power generation-containing cross-regional power grid unit combination decentralized coordination optimization strategy

Abstract

The invention discloses a new energy power generation-containing cross-regional power grid unit combination decentralized coordination optimization strategy. The method comprises steps of based on thetarget cascade technology, taking a boundary node voltage phase angle value influencing the power of the interconnection line between the interconnected power grids as an inter-region coordination variable; the problem of circulation between regions is avoided; an upper layer coordinator is formed for coordinating and optimizing voltage phase angles of boundary nodes of all the areas, a lower layer is optimized for parallel solving of SCUC problems of all the areas, convergence is judged through alternate iteration solving of the upper layer coordinator optimization problem and the lower layer coordinator optimization problem, and if all the areas converge at any time, iteration is finished, and an optimal solution is obtained; In this way, coordinated optimization of the unit starting and stopping plan, the standby plan and the tie line transmission power in the area is achieved. According to the strategy provided by the invention, power grid resources can be reasonably controlled and economically dispatched, the actual requirements of network security and line power flow are met, 'source-network-load' coordination and resource sharing among regions can be realized, and the operation economy and reliability of the power grid are effectively improved.

Description

technical field [0001] The invention relates to the field of unit coordination of cross-regional power grids, in particular to a decentralized coordination optimization strategy for cross-regional power grid unit combinations including new energy power generation. Background technique [0002] In recent years, the total capacity of wind and light grid-connected has reached 89.6% of the total new energy grid-connected, but its inherent volatility and randomness have increased the risk of safe operation of the power system, and it is becoming more and more difficult for a single-regional power grid to be optimized. The unit combination plan has caused a large number of wind and solar curtailment. Cross-regional power grids share resources through inter-regional tie lines. Compared with single-regional operation, it can reduce power grid operating costs and effectively improve power grid operation reliability. Therefore, multi-regional power grid interconnection has become the ...

AI Technical Summary

Problems solved by technology

The upper-level dispatching center is responsible for the coordination and processing of the power flow of the tie lines between interconnected regions. The lower-level dispatching centers independently solve the SCUC problems of each regional power grid in parallel, which has a fast convergence speed. However, the upper-level dispatching center uses the inter-regional tie-line power as the coordination Variables, unable to avoid the circulation problem in the mesh structure interconnection grid system

[0004] To sum up, the main problem in the study of unit combinations in cross-regional power grids with new energy access is: with the increase of operational uncertainties and the rapid expansion of the scale of interconnected power grids, the dimension of nonlinear optimization problems to be solved increases significantly , how to obtain the practical and feasible day-ahead unit combination scheme under the basic requirements of ensuring the convergence speed and calculation accuracy of the problem

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