Power flow calculation method of loop-network type power distribution system

Abstract

The invention discloses a power flow calculation method of a loop-network type power distribution system. The power flow calculation method comprises the following steps: building a circuit mode according to the characteristic of the loop-network type power distribution system; numbering nodes and branches of the circuit mode; representing initial data, specially data description of a circuit topological structure, of circuits by utilizing a matrix form to ensure that logical relations of graphics connection in the circuit mode are clear and definite; realizing programmed design of a path searching process due to introduction of a correlative matrix; using the initial data matrix as unique data input so that the whole program is designed directly and simply; reasonably expanding a loop ofthe loop-network type power distribution system by utilizing the knowledge of a graphic theory in a calculation process, and equivalently carrying out calculation for a radiation type power distribution system so that the calculation process is greatly simplified; and solving power flow of the various branches and voltage of various load nodes of a power distribution network by mainly utilizing algebraic operation of matrix elements, and therefore, the program calculation time is less, and the convergence speed is higher.

Description

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

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, and this algorithm is complicated and lost The advantage of fast decoupling is that the original calculation amount is small and the convergence is reliable; the loop impedance method requires complex node and branch numbers, which is time-consuming

In comparison, the forward push back generation power flow algorithm has a clear physical concept, but due to the huge distribution network structure and many branches, the search for network structure data in the calculation process affects the calculation speed of the power flow. Calculating the power loss of the branches at all times, involves direct calculation of the data matrix, takes up a lot of space and is time-consuming, and is only applicable to power distribution networks with a radial network structure

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