Linear Power-Flow Formulation Based on a Voltage-Dependent Load Model

被引:114
作者
Marti, Jose R. [1 ]
Ahmadi, Hamed [1 ]
Bashualdo, Lincol [1 ]
机构
[1] Univ British Columbia, Dept Elect & Comp Engn, Vancouver, BC V6T 1Z4, Canada
关键词
Distribution system; linear power-flow (LPF) analysis; voltage-dependent load model; CURRENT INJECTION METHOD; DISTRIBUTION-SYSTEMS; RECONFIGURATION;
D O I
10.1109/TPWRD.2013.2247068
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The power-flow (PF) solution is a fundamental tool in power system analysis. Standard PF formulations are based on the solution of a system of nonlinear equations which are computationally expensive due to the iterations needed. On the other hand, distribution-system (DS) automation algorithms should be fast enough to meet real-time performance. The conventional load representation, as constant P-Q, becomes less accurate as we get closer to the actual load's level. In this paper, a new load model is proposed which represents the loads' voltage dependency. A simple curve-fitting technique is used to derive a voltage-dependent load model which splits the load as a combination of an impedance and a current source. With this representation and some numerical approximations on the imaginary part of the nodal voltages, it is possible to formulate the load-flow problem as a linear power-flow (LPF) solution which does not require iterations. The approximation has been tested in systems up to 3000 nodes with excellent results. The LPF formulation is particularly important in the context of optimization algorithms for automated smart distribution systems. The extension of the technique to unbalanced distribution systems will be presented in future work.
引用
收藏
页码:1682 / 1690
页数:9
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