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

Abstract

The invention discloses a simple push-back generation power flow calculation method for an active distribution network. It includes the following steps: determine the forward and backward order of branches, and perform forward calculation in this order, and then perform back calculation according to the branch sequence to complete a power flow calculation. After multiple forward and back cycles, The power flow solution can be obtained; forward calculation: for the first calculation, set the initial value of each node voltage as the first node voltage, and for subsequent calculations, take the node voltage calculated in the last iterative calculation, start from the last node, and take or calculate the node according to the node type Active power, reactive power, or node power and reactive power calculated by back generation, calculate the current of each branch from the end of the radial network; back generation calculation: start from the voltage of the root node, and calculate the downstream node voltage according to the different node voltages , or voltage phase angle and reactive power, and calculate the voltage of each node towards the end; the invention solves the problem of power flow oscillation caused by the adjustment value, and the method is simple, the calculation amount is small, and it 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...

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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

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