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Power flow approximation for DC networks with constant power loads via logarithmic transform of voltage magnitudes

机译:通过电压幅度的对数变换,对具有恒定功率负载的DC网络的功率流近似

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摘要

This paper proposes a logarithmic transformation of voltages (LTVM) for the power flow in DC grids. This problem is non-linear due to the presence of constant power loads (CPLs), which also introduce a negative resistance effect that can create numerical instability for conventional algorithms. The proposed methodology is applied to dc-microgrids, dc-distribution and multi-terminal high voltage DC transmission (MT-HVDC). Two main approximations are presented and compared in terms of computational performance and the accuracy of the solution. Simulation results performed in Matlab/Octave demonstrate the advantages of the proposed methodology using a complete set of test systems, from low to high voltage applications. The proposed methodology does not require any consideration about the topology of the grid (radial or meshed) or the number of constant power loads.
机译:本文提出了直流电网中功率流的电压对数变换(LTVM)。由于存在恒定功率负载(CPL),因此该问题是非线性的,这还会引入负电阻效应,从而可能会导致常规算法产生数值不稳定。所提出的方法应用于直流微电网,直流配电和多端子高压直流输电(MT-HVDC)。给出了两个主要的近似值,并在计算性能和解的准确性方面进行了比较。在Matlab / Octave中执行的仿真结果使用从低电压应用到高电压应用的一整套测试系统证明了所提出方法的优势。所提出的方法不需要考虑电网拓扑结构(径向或网格)或恒定功率负载的数量。

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