Linearized power flow calculation method for radial distribution network

Abstract

The invention, which belongs to the technical field of operation control of the power system, relates to a linearized power flow calculation method for a radial distribution network. On the basis of the traditional linear equation without considering the network loss and the interphase mutual impedance, linear expansion of the nonlinear network loss item is included by the equation and a linearized three-phase branch power flow equation is established; with active power loads and reactive power loads of all nodes, similar values of active powers and reactive powers of all branches and all nodevoltages are calculated to obtain a power flow calculation result of the radial distribution network. According to the invention, compared with the linearized branch flow equation without consideringthe network loss, the provided equation enables the computing precision to be improved substantially; an approximate solution of the power flow can be obtained directly without iterative solution, sothat computing is done quickly. The linearized power flow calculation method is suitable for the scene with strict performance requirements on the real-time online analysis of the distribution network.

Description

technical field [0001] The invention relates to a linearized power flow calculation method of a radial distribution network, belonging to the technical field of power system operation control. Background technique [0002] Compared with the transmission network, the distribution network has the following salient features: [0003] 1. Basically, it operates in a radial network, and there is no ring loop. [0004] 2. The three-phase parameters of the line are asymmetrical, the three-phase loads of the nodes are unbalanced, and some branches operate in a single-phase or two-phase state. [0005] 3. The branch resistance and reactance are similar in size, which does not satisfy the PQ decoupling condition. [0006] Therefore, it is necessary to consider the above characteristics and establish a power flow model that conforms to the operating characteristics of the distribution network. [0007] At present, many scholars have proposed power flow algorithms suitable for distrib...

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Problems solved by technology

[0004] 2. The three-phase parameters of the line are asymmetrical, the three-phase loads of the nodes are unbalanced, and some branches operate in a single-phase or two-phase state

[0005] 3. The branch resistance and reactance are similar in size, which does not meet the PQ decoupling condition

At present, based on the radial operation characteristics of the distribution network, the single-phase branch power flow equation has been proposed in the literature, and the network loss item is omitted as a linear equation solution. The disadvantage of this method is that the accuracy of the power flow calculation results is poor due to the neglect of the network loss.

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