Power flow model linearization error minimization method based on variable space optimal selection
A technology of variable space and power flow model, which is applied in the direction of AC networks with the same frequency from different sources, can solve the problems of lack of power flow calculation and optimal power flow verification, reduce linearization errors, reduce linear errors, and improve computational efficiency. sticky effect
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Embodiment 1
[0058] The method of minimizing the linearization error of the power flow model based on the optimal selection of the variable space mainly includes the following steps:
[0059] 1) Using the finite-order Taylor expansion method to establish a linear power flow model based on the node space of the power system.
[0060] The main steps of establishing a linear power flow model based on the node space of the power system using the finite-order Taylor expansion method are as follows:
[0061] 1.1) Establish the power flow equation in the form of node injection, namely:
[0062]
[0063]
[0064] In the formula, P i and Q i are active power injection and reactive power injection of node i, respectively. j∈i represents the node set j connected to node i. the y ii =g ii +jb ii is the parallel admittance at node i. v i is the voltage amplitude of node i. P ij and Q ij are the active power and reactive power on the branch from node i to node j, respectively. θ ij i...
Embodiment 2
[0093] The experiment to verify the method of minimizing the linearization error of the power flow model with the optimal selection of the variable space mainly includes the following steps:
[0094] a) Historical scenarios of power flow calculation and optimal power flow
[0095] The present invention selects IEEE 30 and IEEE 118 and system power flow calculation and optimal power flow situation to verify and compare the error situation of this method and the traditional linear power flow model listed in Table 1. All cases contain different load fluctuations. These scenarios are divided into two categories, which are explained below:
[0096] 1) Sample scenarios: These scenarios are input into the optimal variable space selection model to obtain a linear power flow model with minimum linearization error.
[0097] 2) Test scenarios: These scenarios are used to test the accuracy of the linear power flow model in power flow calculation and OPF.
[0098] The input data informa...
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