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2016 American Control Conference (ACC)最新文献

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A practical integration of automatic generation control and Demand Response 一个实际集成的自动发电控制和需求响应
Pub Date : 2016-07-06 DOI: 10.1109/ACC.2016.7526740
Dylan J. Shiltz, A. Annaswamy
For a power grid to operate properly, electrical frequency must be continuously maintained close to its nominal value. Increasing penetration of distributed generation, such as solar and wind generation, introduces fluctuations in active power while also reducing the natural inertial response of the electricity grid, creating reliability concerns. While frequency regulation has traditionally been achieved by controlling generators, the control of Demand Response (DR) resources has been recognized in recent smart grid literature as an efficient means for providing additional regulation capability. To this end, several control methodologies have been proposed recently, but various features of these proposals make their practical implementations difficult. In this paper, we propose a new control algorithm that facilitates optimal frequency regulation through direct control of both generators and DR, while addressing several issues that prevent practical implementation of other proposals. In particular, i) our algorithm is ideal for control over a large, low-bandwidth network as communication and measurement is only required every 2 seconds, ii) it enables DR resources to recover energy lost during system transients, and iii) it allows the market to immediately respond to disturbances through feedback of the system frequency. We demonstrate the viability of our approach through dynamic simulations on a 118-bus grid model.
为了使电网正常运行,电频率必须持续保持在其标称值附近。分布式发电,如太阳能和风能发电的日益普及,在减少电网自然惯性响应的同时,引入了有功功率的波动,造成了可靠性问题。虽然频率调节传统上是通过控制发电机来实现的,但在最近的智能电网文献中,需求响应(DR)资源的控制已被认为是提供额外调节能力的有效手段。为此,最近提出了几种控制方法,但这些建议的各种特性使它们的实际实现变得困难。在本文中,我们提出了一种新的控制算法,通过直接控制发电机和DR来实现最佳频率调节,同时解决了阻碍其他建议实际实施的几个问题。特别是,i)我们的算法非常适合控制大型低带宽网络,因为每2秒只需要通信和测量一次;ii)它使DR资源能够恢复系统瞬态期间丢失的能量;iii)它允许市场通过系统频率的反馈立即响应干扰。我们通过在118总线网格模型上的动态仿真证明了我们方法的可行性。
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引用次数: 18
Wind turbine loads reduction using feedforward feedback collective pitch control based on the estimated effective wind speed 基于估计有效风速的前馈反馈集体螺距控制风力机负荷降低
Pub Date : 2016-07-06 DOI: 10.1109/ACC.2016.7525259
F. Meng, J. Wenske, A. Gambier
Wind being the primary energy resource has a huge influence on the dynamic behavior of wind turbines. Therefore, the control algorithms can be further improved if the wind speed is known by the controller. Unfortunately, either no accurate direct online measurement of the effective wind speed is available or the measurement system is too expensive, which means that it should be estimated in order to make such improvement applicable on the control algorithm in practice. In this paper a new feedforward feedback collective pitch control algorithm based on the estimated effective wind speed and wind speed extrapolation is presented for improving the traditional collective pitch controller. The simulation results show that with the presented controller both fatigue loads and extreme loads can be reduced for the turbulent wind field and extreme operating gust respectively.
风作为一种主要的能源,对风力发电机组的动力性能有很大的影响。因此,如果控制器知道风速,则可以进一步改进控制算法。不幸的是,要么没有准确的在线直接测量有效风速,要么测量系统过于昂贵,这意味着需要对有效风速进行估计,才能使这种改进在实际控制算法中适用。针对传统的集体螺距控制器,提出了一种基于估计有效风速和风速外推的前馈反馈集体螺距控制算法。仿真结果表明,该控制器能有效地降低湍流风场的疲劳载荷和极端工作阵风的极限载荷。
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引用次数: 13
A bound on the minimum rank of solutions to sparse linear matrix equations 稀疏线性矩阵方程解的最小秩的一个界
Pub Date : 2016-07-06 DOI: 10.1109/ACC.2016.7526693
Raphael Louca, S. Bose, E. Bitar
We derive a new upper bound on the minimum rank of matrices belonging to an affine slice of the positive semidefinite cone, when the affine slice is defined according to a system of sparse linear matrix equations. It is shown that a feasible matrix whose rank is no greater than said bound can be computed in polynomial time. The bound depends on both the number of linear matrix equations and their underlying sparsity pattern. For certain problem families, this bound is shown to improve upon well known bounds in the literature. Several examples are provided to illustrate the efficacy of this bound.
当正半定锥的仿射片由一组稀疏线性矩阵方程定义时,我们导出了属于该仿射片的矩阵的最小秩的一个新的上界。证明了在多项式时间内可以计算出秩不大于上述界的可行矩阵。该界取决于线性矩阵方程的数量及其潜在的稀疏性模式。对于某些问题族,这个界被证明比文献中已知的界有所改进。提供了几个例子来说明这种界限的有效性。
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引用次数: 0
Robust performance analysis for a range of frequencies 鲁棒性能分析范围的频率
Pub Date : 2016-07-06 DOI: 10.1109/acc.2016.7526558
S. Boersma, A. Korniienko, Khaled Laib, J. Wingerden
Time domain specifications such as overshoot, rise time and tracking behaviour can be extracted from an amplitude frequency response. For uncertain systems we use for this an upper bound on the maximum amplitude frequency response. There are tools which can compute this upper bound for each frequency in a grid. Computing this upper bound can be computational expensive when studying a large scale system hence it is interesting to have a low dense frequency grid. However, in such a case, it can for example occur that the maximum peak of the amplitude frequency response occurs at a frequency which is not in this grid. A consequence is that the overshoot will not be determined well for the system. In this paper we will present a method such that this can not occur. We will augment the uncertainty set with an additional uncertain parameter. This uncertain parameter will cover the frequencies which are not covered by the grid. This allows us to do a robustness analysis for a range of frequencies. In this case we are sure that we do not miss any crucial information with respect to the amplitude frequency response lying in between the frequencies in the grid. We illustrate this using two simulation examples.
时域规格,如超调,上升时间和跟踪行为可以从振幅频率响应中提取。对于不确定系统,我们使用最大振幅频率响应的上界。有一些工具可以计算网格中每个频率的上限。当研究一个大规模系统时,计算这个上界的计算成本很高,因此有一个低密度的频率网格是很有趣的。然而,在这种情况下,例如,可能出现振幅频率响应的最大峰值出现在不在这个网格中的频率上。其结果是,系统无法很好地确定超调。在本文中,我们将提出一种方法,使这种情况不会发生。我们将用一个附加的不确定参数来扩大不确定集。这个不确定参数将覆盖网格未覆盖的频率。这使我们能够对频率范围进行鲁棒性分析。在这种情况下,我们确信我们不会错过任何关于网格中频率之间的幅频响应的关键信息。我们使用两个模拟示例来说明这一点。
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引用次数: 4
Characterization of the convective instability of the Aw-Rascle-Zhang model via spectral analysis 用谱分析表征Aw-Rascle-Zhang模式的对流不稳定性
Pub Date : 2016-07-06 DOI: 10.1109/ACC.2016.7526632
Francois Belletti, M. Huo, X. Litrico, A. Bayen
This article starts from the classical Aw-Rascle-Zhang (ARZ) model for freeway traffic and develops a spectral analysis of its linearized version. A counterpart to the Froude number in hydrodynamics is defined that enables a classification of the nature of vehicle traffic flow using the explicit solution resulting from the analysis. We prove that our linearization about an equilibrium is stable for congested regimes and convective-unstable otherwise. NGSIM data for congested traffic trajectories is used to compare the linearized model's predictions with actual macroscopic behavior of traffic. The model is shown to achieve good accuracy for speed and flow. In particular, it replicates the propagation of boundary conditions' oscillations into the interior resolution domain of the PDE under study.
本文从高速公路交通的经典Aw-Rascle-Zhang (ARZ)模型出发,对其线性化版本进行了谱分析。定义了一个与流体力学中的弗劳德数相对应的数,可以使用分析得出的显式解决方案对车辆交通流的性质进行分类。我们证明了平衡的线性化对于拥挤区域是稳定的,对于其他区域是对流不稳定的。NGSIM拥堵交通轨迹数据用于比较线性化模型的预测与实际宏观交通行为。结果表明,该模型在速度和流量方面具有较好的精度。特别是,它将边界条件振荡的传播复制到所研究的PDE的内部分辨率域中。
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引用次数: 2
Multi-stage anti-windup for LTI systems with actuator magnitude and rate saturation 具有执行器幅度和速率饱和的LTI系统的多级防绕组
Pub Date : 2016-07-06 DOI: 10.1109/ACC.2016.7526525
Maryam Sadeghi Reineh, Solmaz S. Kia, F. Jabbari
We consider systems with actuator magnitude and rate limitations, and assume there are high performance compensators with highly desirable properties as long as the actuator limitations are not violated. A multi-stage anti-windup (AW) scheme is presented that provides stability and performance measures, for commands with known bound. More critically, it uses different gains for different levels of saturation, allowing for more aggressive anti-windup gains when the command signals are moderately above the actuator limitations. The benefits are shown through an illustrative example.
我们考虑具有执行器大小和速率限制的系统,并假设只要不违反执行器限制,就存在具有非常理想性能的高性能补偿器。针对边界已知的命令,提出了一种多级防关闭方案,提供了稳定性和性能指标。更关键的是,它对不同的饱和水平使用不同的增益,当命令信号略高于执行器限制时,允许更积极的抗绕组增益。通过一个说明性的例子说明了这些好处。
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引用次数: 7
A robust extended Kalman filter for modeling piezoelectric actuators 用于压电致动器建模的鲁棒扩展卡尔曼滤波器
Pub Date : 2016-07-06 DOI: 10.1109/ACC.2016.7526071
N. Chuang
This paper presents an improved hysteretic model for a piezoelectric actuator (PEA) based nano-positioning system. PEAs exhibit hysteresis nonlinearities, which can dramatically limit control performance and accuracy of the nano-positioning system. The paper provides a design of a hysteretic nonlinearity estimator using a robust extended Kalman filter to determine the best estimate for the hysteresis model. A good quality and an accurate level of the model is an important task and a prerequisite that may significantly affect the control performance in nano-positioning systems even using an advanced controller. With the respect to the hysteresis model considered in [1], the proposed approach in this paper demonstrates a significant improvement to have perfectly matched the experimental data of the measured hysteresis curve of the displacement by comparing the one presented in [1].
提出了一种改进的压电致动器纳米定位系统的滞后模型。豌豆具有非线性滞后特性,严重影响了纳米定位系统的控制性能和精度。本文提出了一种利用鲁棒扩展卡尔曼滤波的滞回非线性估计器的设计,以确定滞回模型的最佳估计。在采用先进控制器的纳米定位系统中,良好的模型质量和精度水平是影响控制性能的重要前提。相对于[1]中所考虑的迟滞模型,本文所提出的方法与[1]中的方法相比有了显著的改进,可以很好地匹配位移迟滞曲线实测的实验数据。
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引用次数: 0
Robust periodic observer-based control for periodic discrete-time LTV systems 周期离散LTV系统的鲁棒周期观测器控制
Pub Date : 2016-07-06 DOI: 10.1109/ACC.2016.7525366
C. Agulhari, M. J. Lacerda
New conditions for the design of robust periodic observer-based controllers for periodic discrete-time linear time-varying (LTV) systems are proposed in this paper. The control system is designed to be robust to external noises, and such robustness is achieved by minimizing the ℋ∞ norm from the input noise to the error output in the observer design, and the ℋ∞ norm from the error and disturbance signal to the output in the control design. Concerning the observer, two LMI (Linear Matrix Inequality) conditions are proposed. As part of the main contribution, an LMI condition, based on a dual representation of the LTV system, is also proposed for the synthesis of a robust state-feedback controller that makes use of the observed states rather than the actual states. A numerical example illustrates the validity of the proposed technique.
提出了周期离散线性时变系统鲁棒周期观测器控制器设计的新条件。控制系统对外部噪声具有鲁棒性,这种鲁棒性是通过最小化观测器设计中输入噪声到误差输出的h∞范数,以及最小化控制设计中误差和干扰信号到输出的h∞范数来实现的。对于观测器,提出了两个LMI(线性矩阵不等式)条件。作为主要贡献的一部分,基于LTV系统的对偶表示的LMI条件也被提出用于合成鲁棒状态反馈控制器,该控制器利用观察状态而不是实际状态。数值算例说明了该方法的有效性。
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引用次数: 6
Linear parameter-varying approach for modeling rapid thermal processes 快速热过程的线性变参数建模方法
Pub Date : 2016-07-06 DOI: 10.1109/ACC.2016.7525417
Mark Trudgen, S. Z. Rizvi, J. Mohammadpour
In the present paper, a new approach is presented to model rapid thermal processing (RTP) systems. Within the past decade, RTP has achieved acceptance as the mainstream technology for semiconductor manufacturing. Thermal processing is one of the most efficient ways to control the phase-structure properties; moreover, the time duration of RTP systems reduces the so-called thermal budget significantly compared to the traditional methods. RTP implementation is based on the use of light from heating lamps to provide a heat flux. This process is highly nonlinear due to the radiative heat transfer and material properties. By invoking the first principles-based models, we develop in this paper a linear parameter-varying (LPV) model to directly account for all the nonlinearities within the system. The model is then discretized into a high-order affine LPV system; thereafter, principal component analysis (PCA) method is utilized to reduce the number of LPV model's scheduling variables, followed by the use of proper orthogonal decomposition (POD) for model order reduction. Finally, simulations demonstrate that the low-order LPV model, which is in a form suitable for controller design purposes, retains the properties of the original full-order model.
本文提出了一种快速热加工(RTP)系统建模的新方法。在过去的十年里,RTP已经成为半导体制造的主流技术。热处理是控制相结构性能最有效的方法之一;此外,与传统方法相比,RTP系统的持续时间显著减少了所谓的热预算。RTP的实现是基于使用来自加热灯的光来提供热流。由于辐射传热和材料特性的影响,这一过程是高度非线性的。通过调用基于第一原理的模型,我们在本文中建立了一个线性参数变化(LPV)模型来直接解释系统内的所有非线性。然后将模型离散成一个高阶仿射LPV系统;然后,利用主成分分析(PCA)方法减少LPV模型调度变量的数量,然后利用适当的正交分解(POD)方法进行模型降阶。最后,仿真结果表明,低阶LPV模型保留了原全阶模型的特性,以适合控制器设计的形式存在。
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引用次数: 2
Selecting control input type for a building predictive controller integrated in a power grid 电网中建筑物预测控制器控制输入类型的选择
Pub Date : 2016-07-06 DOI: 10.1109/ACC.2016.7525273
Jeremy S. Dobbs, Meysam Razmara, M. Shahbakhti, S. Paudyal
Application of Model Predictive Control (MPC) for a Smart Building in a Smart Grid environment is studied by using an experimentally validated building thermal model. The goal is to compare three control input types for an office building's Heating, Ventilation, and Air Conditioning (HVAC) system, and select the control type with the best performance. Three types of MPC control input are considered for the HVAC system: (1) solitary control over the supply air temperature, (2) solitary control over the air mass flow rate, and (3) combined control over the supply air temperature and mass flow rate. An objective function is defined based on an introduced Normalized Performance Index (NP-Index) which balances price minimization while maintaining a balanced steady load profile in the grid which benefits customers and the distribution grid utility. The results show that using the combined control approach leads to 20% improvement on NP-Index compared to the solitary mass flow rate control. Additionally, controlling both the supply air temperature and air mass flow rate reduces power consumption by 4% and 13% compared to solitary air temperature control and solitary air mass flow rate control, respectively.
通过实验验证的建筑热模型,研究了模型预测控制在智能电网环境下智能建筑中的应用。目标是比较办公楼暖通空调(HVAC)系统的三种控制输入类型,选择性能最佳的控制类型。暖通空调系统考虑了三种类型的MPC控制输入:(1)单独控制送风温度,(2)单独控制空气质量流量,(3)联合控制送风温度和质量流量。在引入归一化性能指数(NP-Index)的基础上,定义了一个目标函数,该目标函数在平衡价格最小化的同时保持电网中平衡的稳定负荷,从而使客户和配电网公用事业公司受益。结果表明,与单独的质量流量控制相比,采用组合控制方法可使NP-Index提高20%。此外,与单独控制送风温度和单独控制空气质量流量相比,同时控制送风温度和空气质量流量可分别降低4%和13%的功耗。
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引用次数: 1
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2016 American Control Conference (ACC)
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