Abstract
The linear power flow (LPF) models are particularly important in the context of optimization algorithms for three-phase distribution systems with the high penetration of distributed renewable generations. With several approximations on network modelling, voltage drop calculation, link power calculation, voltage controlled bus and ZIP loads, this paper proposed a three-phase LPF model for three-phase unbalanced distribution networks based on loop-analysis theory. The method can deal with voltage-controlled (PV) & Load (PQ) buses and ZIP loads. The approximations of the star and delta connections ZIP loads are also analyzed. Test results based on several standard IEEE test feeders and an improved 615bus test system proved the effectiveness and accuracy of the proposed algorithm. The proposed LPF solution gives a simple, more robust, and potentially faster solution for modern distribution power system.
Highlights
Robust power flow is very important for modern distribution power system (DPS) management, especially with the high penetration of distributed renewable generation into the traditional distribution networks
In order to deal with the nonlinear optimization problems of DPS, the non-iterative and direct calculation of power flow, that is, the linear power flow (LPF) solutions show many advantages and had been studied by many researchers
On the basis of the past work, that is, a loop-analysis theory based single-phase linear power flow methods in [20], and considering the approximate balance of three-phase DPS, this paper proposed a three-phase LPF model for three-phase unbalanced distribution network considering PV & PQ buses and ZIP load
Summary
Robust power flow is very important for modern distribution power system (DPS) management, especially with the high penetration of distributed renewable generation into the traditional distribution networks. In [16], based on the logarithmic transform of voltage magnitudes and the approximation analysis of the general branch flows, a LPF model including PV and PQ buses and tap changers was proposed for the balanced distribution power system. In [18], a linear three-phase power flow model has been proposed for an active distribution network with the consideration of the ZIP type of the loads and PV buses. On the basis of the past work, that is, a loop-analysis theory based single-phase linear power flow methods in [20], and considering the approximate balance of three-phase DPS, this paper proposed a three-phase LPF model for three-phase unbalanced distribution network considering PV & PQ buses and ZIP load.
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