A Power Flow Calculation Method for Distribution Network Simulation

Abstract

A power distribution network simulation load flow calculation method relates to a simulation load flow calculation method, and aims to solve the problems that an existing simulation load flow calculation method is long in a calculation time; the method comprises the following steps: 1, reading original data of a distribution network; 2, forming a network nodal admittance matrix; 3, reading initialvoltage values of all nodes as balance node voltages, setting a node active power deviation second order item as zero, and setting a cycle variable initial value as zero; 4, calculating iteration deviation; 5, calculating voltage deviation; 6, correcting voltages of all nodes; 7, calculating the active power deviation second order item; 8, determining whether a difference between two adjacent iteration results of the active power deviation second order item is smaller than a given error or not, if yes, outputting the result, otherwise, turning to step 9; 9, determining whether the cycle variable has reached the set maximum cycle frequency N or not, if yes, outputting the result, otherwise, adding 1 on the cycle frequency and turning to step 4. The method can fast calculate the power distribution network load flow states, thus providing basic data for power distribution network short circuit calculation and stable analysis.

Description

technical field [0001] The invention relates to a simulation power flow calculation method, in particular to a distribution network simulation power flow calculation method. Background technique [0002] Distribution network power flow calculation is the basic method of distribution network simulation, which can quickly calculate the power flow state of distribution network, and provide basic data for short-circuit calculation and stability analysis of distribution network. Therefore, the distribution network simulation puts forward special requirements for the power flow calculation method, which requires high calculation accuracy, easy convergence, fast convergence speed, and less calculation time, and can handle the power flow convergence of the ill-conditioned system under the extreme operating state of the power grid. question. [0003] The distribution network generally adopts a closed-loop design and an open-loop operation. The R / X ratio in the radial distribution li...

AI Technical Summary

Problems solved by technology

The Newton-Raphson method power flow algorithm has a second-order convergence characteristic, and the convergence speed is faster in the distribution network power flow. However, when the order of the admittance matrix is ​​high, the initial value sensitivity problem is more prominent. Calculating the Jacobian matrix takes a lot of computing time

The forward push-back method has the characteristics of simple programming, fast calculation speed, and good convergence. It is suitable for the calculation of radial distribution network power flow, but it cannot adapt to the calculation of ring network power flow. The algorithm needs to be corrected, which makes the program design complex and requires increase calculation time

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