Optimal Power Flow Incorporating Frequency Security Constraint
Optimal Power Flow Incorporating Frequency Security Constraint
复制标题
考虑频率安全约束的最优潮流
DOI：
10.1109/tia.2019.2938918
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发表时间：
2019-11
影响因子：
4.4
通讯作者：
N. Nguyen;Saleh S Almasabi;Atri Bera;J. Mitra
中科院分区：
文献类型：
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作者：
N. Nguyen;Saleh S Almasabi;Atri Bera;J. Mitra
最优潮流在满足有功和无功平衡、设备能力约束和电压限制等约束条件的同时，最大限度地降低生产成本。本文提出了一种在最优潮流问题框架内加入频率安全约束的方法。常规发电越来越多地被对频率调节能力贡献很小或没有贡献的可再生资源取代，可能需要强制执行这种限制，以满足频率安全要求。要求系统频率保持在安全限度内，从而表明发电量和用电量之间的平衡。因此，潮流优化的解决方案不仅要在运行条件下使发电成本最低，而且要保证频率稳定。为了得到这一解，引入了频率稳定性要求作为功率分配问题的一个新的约束，并用最大频偏极限来表示。这种新的约束被构造为系统惯性和频率调节常数的非线性函数，因为频率偏差对这些因素非常敏感。结果表明，该约束的加入使得OPF在满足频率安全要求的情况下，优先选择满足频率安全要求的大惯性发电机。本文采用遗传算法作为优化工具。通过IEEE RTS-79测试系统验证了该方法的有效性。
Optimal power flow (OPF) minimizes the production cost, while satisfying the constraints on the system, such as real and reactive power balance, equipment capability constraints, and voltage limits. This article presents a method of incorporating a frequency security constraint within the framework of the OPF problem. Increasing displacement of conventional generation by renewable resources that contribute little or no frequency regulation capability may necessitate the enforcement of such a constraint to meet frequency security requirements. The system frequency is required to be maintained within a safe limit, thus indicating the balance between generation and consumption. Hence, the solution for optimization of power flow should not only present a minimum cost of generation within the operating conditions, but also ensure frequency stability. In order to obtain this solution, the requirement of frequency stability is introduced as a new constraint of the power dispatch problem and is represented by the maximum frequency deviation limit. This new constraint is constructed as a nonlinear function of system inertia and the frequency regulation constant, since frequency deviation is highly sensitive to these factors. It is shown that the inclusion of this constraint causes the OPF to preferentially select higher inertia generators as necessary, to satisfy the frequency security requirement. A genetic algorithm is utilized as the optimization tool in this article. The IEEE RTS-79 test system is used to demonstrate efficacy of the proposed method.