Abstract
Extensive penetration of single phase distributed generators (DGs) such as photovoltaic generations may cause serious phase unbalance problems in distribution networks. The phase unbalance condition will make voltage/VAR optimization problem difficult to be solved by using traditional model and methods for balanced distribution networks. A three-phase unbalanced voltage/VAR optimization model for active distribution networks is proposed in this paper. The OLTC transformers and distributed reactive power resources such as static VAR compensators, embedded generators and capacitors banks are considered as control devices to minimize the negative sequence system voltages and network losses. The voltage/VAR optimization problem is formulated as a mixed-integer quadratic constrains quadratic programming (MIQCQP) problem in rectangular coordinates. The optimal solution is obtained by solving the MIQCQP problem using the branch-bound and primal-dual interior point method. Simulation results of the modified IEEE 33-bus test system demonstrate that the proposed model and method are effective.
Published Version
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