Optimal power flow calculating method for equivalent interconnected power network on the basis of consistency of power flow, sensitivity and constraint

Abstract

The present invention provides an optimal power flow calculating method for equivalent interconnected power network on the basis of consistency of power flow, sensitivity and constraint. The method includes the steps as follows: firstly, performing a calculation by utilizing the optimal power flow calculating method so as to acquire the available capacity of the outside network before equivalent; secondly, keeping the constant available capacity before equivalent and after equivalent and the constant constraint information on the basis of consistency satisfaction of power flow and sensitivity, and deducing the constraint condition of the equivalent network; and finally, establishing a new optimal power flow model on the basis of the network after equivalent and the constrain condition. The optimal power flow calculating method calculates the available capacity of boundary nodes and boundary sections of the outside network and deduces the equivalent constraint condition on the basis of consistency of the available capacity before equivalent and after equivalent so that the accuracy of the equivalent constraint calculating is increased. The calculating accuracy of the method provided by the invention is higher than the current optimal power flow calculating method without regard to constraint, and the method can well simulate the running condition of the actual outside network and provide the internal network with suitable power supporting so as to ensure the safe, stable and economic running of the interconnected power network.

Description

technical field [0001] The invention relates to the technical field of power system optimal power flow, in particular to the calculation of the optimal power flow of an interconnected power grid considering an equivalent model. Background technique [0002] With the vigorous development of new energy, the continuous advancement of the power market, and the continuous growth of loads, the power system has gradually developed into a large interconnected power grid with hierarchical partitions and close connections between each partition. Due to the increasing mutual influence between subnets, the influence of the Internet and the extranet must be effectively considered when analyzing and making decisions on the subnet under study (that is, the intranet). However, in some cases, due to technical reasons or issues related to industry confidentiality, grid data cannot be shared between system subnets, resulting in complete data exchange between subnets in the system. Therefore, ...

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Problems solved by technology

This method cannot guarantee the consistency of the constraint information before and after the equivalence, which leads to the reduction of the equivalence accuracy of the external network and the inaccurate calculation of the equivalence constraints, which makes it difficult to meet the analysis and calculation requirements of the internal network, thereby affecting the safe and stable operation of the interconnected grid

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