How Vintage Linear Systems Controllers Have Become Inadequate In Renewables-Heavy Power Systems: Limitations and New Solutions
How Vintage Linear Systems Controllers Have Become Inadequate In Renewables-Heavy Power Systems: Limitations and New Solutions
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DOI：
10.23919/acc53348.2022.9867388
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发表时间：
2022-06
期刊：
影响因子：
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通讯作者：
Sebastian A. Nugroho;A. Taha
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文献类型：
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作者：
Sebastian A. Nugroho;A. Taha
在电力系统中，各种控制工程算法被仪表化以调节电压和频率。这些算法之一是负载频率控制（LFC）。由于控制理论和凸优化的发展，已经提出了许多LFC策略。然而，许多依赖于电力系统的简化的线性化模型，其中：（i）消除负载和可再生能源总线，（ii）仅对同步机进行建模，（iii）非线性网络瞬态被其在紧密操作区域周围的线性近似所取代，以及（iv）消除代数功率流。相比之下，风能和太阳能可再生能源渗透率的增加引入了显著的不确定性，这些不确定性只能通过非线性微分代数方程（NDAE）模型来明确捕获，该模型包含负载，可再生能源以及非线性机器和潮流瞬变。如本文所证明的，这种老式的基于线性化的方法可能是不够的。它们很容易被高度的不确定性所淹没，从而无法在扰动后稳定电力系统。为此，我们展示了一些广泛使用的基于线性化的LFC方法的局限性，并提供了一种新的解决方案，通过一个简单的，线性化的方法，可以处理大的干扰，在电力系统中源于突然减少的可再生能源发电和需求的增加。
In power systems, various control engineering algorithms are instrumented to regulate voltages and frequencies. One of these algorithms is load frequency control (LFC). Thanks to developments in control theory and convex optimization, numerous LFC strategies have been proposed. However, many rely on a reduced, linearized model of power systems where: (i) load and renewables buses are eliminated, (ii) only synchronous machines are modeled, (iii) nonlinear network transients are replaced with their linear approximations around tight operating regions, and (iv) algebraic power flows are eliminated. In contrast, the increased penetration of renewables from wind and solar introduces significant uncertainty which can only be captured explicitly via a nonlinear differential algebraic equation (NDAE) model that incorporates loads, renewables, and nonlinear machine and power flow transients. As it is demonstrated herein, such vintage, linearization-based approaches may be inadequate. They can be easily overwhelmed by high degree of uncertainty, thereby failing to stabilize power systems post-disturbance. To that end, we showcase the limitations of some widely utilized linearization-based LFC methods and offer a new solution which manifests through a simple, linearization-free approach that can handle large disturbances in power systems originating from a sudden reduction of renewables generation and increase of demands.