Simple forward-backward power flow substitution method for active distribution network

Abstract

The invention discloses a compact forward-backward substitution power flow calculation method for an active distribution network. Includes such steps as determining forward and backward sequence of branch, calculating backward according to said sequence, calculating backward according to branch sequence to complete one tidal current calculation, and obtaining tidal current solution after multiplebackward and backward cycles; Forward calculation: the initial value of each node voltage is set as the first node voltage for the first time, and the node voltage calculated in the last iteration istaken for subsequent calculation. Starting from the end node, the node active power, reactive power or node power reactive power calculated back according to the node type is taken or calculated, andthe current of each branch is calculated from the end of the radial network. Backward calculation: starting from the voltage of the root node, according to different node voltages, the voltage of thedownstream node, or voltage phase angle and reactive power are calculated, and the voltage of each node is calculated to the terminal; The invention solves the problem of tidal current oscillation caused by the regulating amount, and the method is simple and direct, the calculation amount is small, and the method can converge reliably.

Description

technical field [0001] The invention belongs to the technical field of distribution networks, and in particular relates to a simple forward-backward power flow calculation method for an active distribution network. Background technique [0002] The push-forward method is one of the effective methods to calculate the power flow of distribution network. According to the operating characteristics and status of different types of distributed generation (Distributed Generation-DG) connected to the distribution network, when using the forward push-back method to calculate the power flow, it can be used as the four parameters of PQ, PV, PI, and PQ(V) types of nodes. Among these four types of nodes, PI and PQ(V) nodes can be converted into PQ nodes according to the given parameters of the nodes during the forward push process, and the reactive power Q of the nodes can be calculated i . For PV nodes with reactive power reserves, the reactive power Q of the nodes i It is related t...

AI Technical Summary

Problems solved by technology

The method of determining the impedance value of the virtual branch lacks rigorous theoretical support and requires a large amount of impedance calculation

Images