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A PMU-Based Method for On-Line Thevenin Equivalent Estimation
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DOI：10.1109/TPWRS.2021.3125007.png)
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The paper proposes a technique for the on-line estimation of Thevenin equivalent (TE) which only needs the present phasor measurements. The technique is based on the wide-area measurements including voltage and current phasors of the system loads and synchronous generators, so that it can simultaneously estimate TE of the system seen from the interested buses. The technique has two main steps. In the first step, the conventional impedance matrix (Z) over bar (bus) is modified to be suitable forTEestimation. In the second step, a correction coefficient based on the sensitivity theory calculated by using two consecutive phasor measurements is applied to correct the diagonal terms of the (Z) over bar (bus) matrix. Simulation results carried on the IEEE 39-bus and 118-bus test systems show that the proposed technique can accurately estimate the TE for both generation and consumption buses under any loadincrease scenario. The comparison scenarios verify the superiority of the proposed technique over others.
Keyword:
Thevenin equivalent
phasor measurements
bus impedance matrix
sensitivity theory
maximum power transfer
期刊
IF:
7.2
论文数:
1.1W
被引数:
5.0W
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