Simulation model of decoupled power flow for AC and DC power grids

Abstract

The invention relates to an AC-DC power grid decoupled load flow simulation model. The AC-DC power grid decoupled load flow simulation model comprises an AC network part Delta Sph, a DC network part Delta Dph, a transverter part Delta Vph and a control equation Delta Vkz, wherein the AC network part Delta Sph comprises an AC node active balance equation Delta Ps and an AC node reactive balance equation Delta Qs; the DC network part Delta Dph comprises a DC node power balance equation Delta Pd; the transverter part Delta Vph comprises a transverter AC side active balance equation Delta Pcs, a transverter AC side reactive balance equation Delta Qcs and a transverter DC side power balance equation Delta Pcd; and the control equation Delta Vkz comprises a constant DC side voltage control equation Delta icuc_set, a constant AC side active control equation Delta PcPs_set, a constant AC side reactive control equation Delta QcQs_set and a constant AC side voltage control equation Delta QcUs_set. The AC-DC power grid decoupled load flow simulation model can guarantee the calculation efficiency for parallel computing for load flow simulation in a large scale AC-DC hybrid power grid for the model.

Description

technical field [0001] The invention relates to a decoupling power flow simulation model of an AC and DC power grid. Background technique [0002] The basic method of power flow simulation calculation is to use the Newton-Raphson method to iteratively solve it. The basic steps are to partially differentiate the power flow equation of the power grid, and calculate the correction direction of the solution through the matrix calculation of the deviation between the matrix of variable partial derivatives and the power flow equation. Correct the power flow solution step by step until the deviation meets the residual requirement. [0003] At present, there is no decoupling power flow simulation calculation method for AC and DC power grids. Conventional AC / DC grid power flow simulation programs mainly include simultaneous solution method and alternate solution method. [0004] The basic principle of the simultaneous solution method: combine the power flow equations of the AC powe...

AI Technical Summary

Problems solved by technology

The adjustment and addition of specific equipment and models in the simultaneous solution model of AC and DC power grids requires modification of the overall simultaneous equations, which lacks corresponding flexibility. At the same time, the method itself determines that parallel computing of large power grids cannot be performed in blocks.

However, the alternate solution model of the AC and DC power grid cannot fundamentally solve the stability of the algorithm convergence, and there is a problem of poor convergence when the initial value is bad.

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