Load Frequency Control in Power Systems via Internal Model Control Scheme and Model-Order Reduction
Load Frequency Control in Power Systems via Internal Model Control Scheme and Model-Order Reduction
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DOI：
10.1109/tpwrs.2013.2245349
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发表时间：
2013-03
影响因子：
6.6
通讯作者：
Sahaj Saxena;Y. V. Hote
中科院分区：
文献类型：
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作者：
Sahaj Saxena;Y. V. Hote
由于突然的小负载扰动、参数不确定性、结构变化等的存在，大型电力系统很容易出现性能恶化。因此，现代控制方面在电力系统的负载频率控制（LFC）设计中极其重要。本文将 LFC 问题描述为典型的扰动抑制和大规模系统控制问题。为此，提出了针对具有参数不确定性和负载扰动的电力系统的 LFC 设计的简单方法。该方法基于二自由度内模型控制 (IMC) 方案，该方案统一了模型降阶的概念，如 Routh 和 Padé 近似，以及 Liu 和 Gau 最近开发的改进的 IMC 滤波器设计[24]。本文的优点在于，考虑了低阶（即二阶简化系统）模型，而不是采用全阶系统作为 IMC 内部模型。该方案提高了闭环系统性能以抵消负载扰动。该方法在 MATLAB 环境中针对由单个发电机组和非再热涡轮机组成的单区域电力系统进行了仿真，以突出鲁棒性和优化性方面的效率和功效。
The large-scale power systems are liable to performance deterioration due to the presence of sudden small load perturbations, parameter uncertainties, structural variations, etc. Due to this, modern control aspects are extremely important in load frequency control (LFC) design of power systems. In this paper, the LFC problem is illustrated as a typical disturbance rejection as well as large-scale system control problem. For this purpose, simple approach to LFC design for the power systems having parameter uncertainty and load disturbance is proposed. The approach is based on two-degree-of-freedom, internal model control (IMC) scheme, which unifies the concept of model-order reduction like Routh and Padé approximations, and modified IMC filter design, recently developed by Liu and Gao [24]. The beauty of this paper is that in place of taking the full-order system for internal-model of IMC, a lower-order, i.e., second-order reduced system model, has been considered. This scheme achieves improved closed-loop system performance to counteract load disturbances. The proposed approach is simulated in MATLAB environment for a single-area power system consisting of single generating unit with a non-reheated turbine to highlight the efficiency and efficacy in terms of robustness and optimality.