Power flow calculation method of radiation type power distribution system

Abstract

The invention discloses a power flow calculation method of a radiation type power distribution system; specific to the power distribution system in one direction of a power distribution network district, power flow calculation is carried out; firstly, according to the characteristics of the radiation type power distribution system, a circuit model of the radiation type power distribution system isbuilt, the topology structure of the radiation type power distribution system is reasonably numbered, and the initial data of the circuit is represented by means of a matrix form, especially data description of the circuit topological relation, so that the logic relation of the graph connection in the circuit model is clear and definite; the introduction of the incidence matrix realizes the programming design of the path searching process, and the initial data matrix is used as the only data input, so that the design of the whole program is direct and simple; and the voltage of each load nodeand the power flow of each branch of the power distribution network are solved through algebraic operation of the matrix elements in the calculation process, so that the calculation time of the program is relatively short, and the convergence speed is relatively high.

Description

technical field [0001] The invention relates to the technical field of low-voltage power distribution, in particular to a power flow calculation method for a radial power distribution system. Background technique [0002] At present, distribution network power flow calculation is an important basis for distribution network system analysis and economic operation. Distribution network network reconfiguration, fault handling, reactive power optimization, state estimation, and line loss analysis all require the results of distribution network power flow calculations. A power flow calculation method with good performance is the key to power distribution system management. As the power sector pays more and more attention to distribution network management, research on power flow calculations for distribution networks has been widely carried out. Since the distribution network is the intermediate link between the transmission network and the power user, the voltage level is lower...

AI Technical Summary

Problems solved by technology

However, the Newton method needs to form an admittance matrix, and the diagonal advantage of the Jacobian matrix no longer exists, so it is difficult to converge; the improved PQ decoupling method introduces compensation technology for lines with large R / X values. This algorithm is complicated and loses Fast decoupling has the advantages of small amount of calculation and reliable convergence; the loop impedance method requires complex node and branch numbers, which is time-consuming

In comparison, the forward-back generation algorithm makes full use of the radial structure of the network. The physical concept of this method is clear. However, due to the large structure of the power distribution system and many branches, the search for system structure data in the calculation process has an impact on The calculation speed of the power flow is reduced, and the power loss of the branch is calculated every time the data is pushed forward, which involves direct calculation of the data matrix, which takes up a lot of space and is time-consuming

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