Power transmission and distribution network integrated reactive power optimization method based on distributed computation

Abstract

The invention discloses a power transmission and distribution network integrated reactive power optimization method based on distributed computation. A generalized master-slave method is used for decomposing a power transmission and distribution network problem to three parts, namely power transmission network reactive power optimization, power distribution network reactive power optimization and boundary information exchange. A quadratic penalty function and a primal-dual interior point method are utilized for alternately computing a power transmission reactive power optimization sub-problem and a power distribution reactive power optimization sub-problem. Through exchanging boundary influence factors (boundary connecting node voltage, equivalent power and target function boundary Lagrange multiplier information), coordination participation is realized, and furthermore distributed computation for whole network reactive power optimization is realized, wherein discrete variables which commonly exist in reactive power optimization cause high difficulty in computing the boundary multiplier. The quadratic penalty function is introduced for regulating the discrete variables so that processing of the discrete variables is realized based on a differentiable power transmission and distribution global optimization target function. According to the method of the invention, a distributed computation method is utilized for settling an integrated reactive power optimization problem of the power transmission and distribution network, thereby keeping an existing computation mode of the power transmission and distribution network and realizing relatively high computation precision.

Description

technical field [0001] The invention relates to an integrated reactive power optimization method for a transmission and distribution network, in particular to an integrated reactive power optimization method for a transmission and distribution network based on distributed computing, and belongs to the technical field of power system optimization operation. Background technique [0002] With the continuous growth of the penetration ratio of DG in the distribution network, the distribution network will have the functions of power reception, power distribution, and coordinated transmission network operation. The operating characteristics and operation mode of the distribution network will become increasingly complex, and the connection with the main network will be closer, and the means of reactive power regulation will be more abundant. The reactive power optimization of the transmission network can no longer ignore the reactive power and voltage support of the distribution ne...

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Problems solved by technology

This scheme uses the method of exchanging boundary variables and multipliers to obtain an accurate global optimal solution to a certain extent, but the exchange of boundary multipliers has certain requirements for the solution algorithm of the transmission and distribution network, and the processing of discrete variables also brings certain problems. difficulty

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