有功配电网三相不平衡电压/无功优化

Jin-quan Zhao, X. Liu, Changnian Lin, Wenhui Wei
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引用次数: 6

摘要

光伏发电等单相分布式发电机组的广泛普及可能会导致配电网出现严重的相不平衡问题。相位不平衡使得配电网电压/无功优化问题难以用传统的平衡配电网模型和方法解决。提出了一种有功配电网三相不平衡电压/无功优化模型。将OLTC变压器和分布式无功资源(如静态无功补偿器、嵌入式发电机和电容器组)作为控制装置,以最小化负序系统电压和网络损耗。将电压/无功优化问题表述为直角坐标系下的混合整数二次约束规划问题。利用分支定界法和原对偶内点法求解MIQCQP问题,得到了最优解。对改进后的IEEE 33总线测试系统的仿真结果表明了该模型和方法的有效性。
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Three-phase unbalanced voltage/VAR optimization for active distribution networks
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.
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