Optimal Power Flow Design for Enhancing Dynamic Performance: Potentials of Reactive Power
Optimal Power Flow Design for Enhancing Dynamic Performance: Potentials of Reactive Power
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DOI：
10.1109/tsg.2020.3019417
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发表时间：
2020-08
影响因子：
9.6
通讯作者：
M. Inoue;T. Sadamoto;Mitsuru Arahata;A. Chakrabortty
中科院分区：
文献类型：
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作者：
M. Inoue;T. Sadamoto;Mitsuru Arahata;A. Chakrabortty
提出了一种新的最优潮流设计方法，该方法不仅可以优化燃料成本，而且可以提高电力系统的动态性能。性能通过从任何干扰输入到一组性能输出的传递矩阵的H_2 -范数来量化，在这种情况下，这些输出被选为发电机的频率。H_2 -范数模拟了扰动后频率幅值的衰减，从而量化了系线流上产生的阻尼力矩。该方法被称为H_2 -功率流修正（H_2 -PFM），分两步进行。首先，求解正则OPF，得到发电机有功和无功调度的最优设定值；其次，重新调整负载设定值以最小化上述$H_2$ norm，同时保持发电机设定值固定。特别是，以这种方式操纵负载无功功率可以显著降低范数，提高干扰衰减和阻尼。为此，提出了一种梯度下降算法。使用68总线测试系统与太阳能发电场验证了结果。
We present a new optimal power flow (OPF) design that not only optimizes fuel cost but also enhances dynamic performance of a power system. Performance is quantified by the $H_2$ -norm of the transfer matrix from any disturbance input to a set of performance outputs, which in this case are chosen as the frequencies of the generators. The $H_2$ -norm models the attenuation of the frequency amplitudes following the disturbance, and thereby quantifies the amount of damping torque induced on the tie-line flows. The method, referred to as $H_2$ -power flow modification ( $H_2$ -PFM) is carried out in two steps. First, the regular OPF is solved to obtain the optimal generator setpoints for active and reactive power dispatch. Second, the load setpoints are re-tuned to minimize the aforesaid $H_2$ -norm while keeping the generator setpoints fixed. In particular, manipulating the load reactive power in this way is found to reduce the norm remarkably, improving disturbance attenuation and damping. A gradient descent algorithm is proposed for this minimization. Results are validated using the 68-bus test system with a solar farm.