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2018 European Control Conference (ECC)最新文献

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Supervised Energy Management in Advanced Aircraft Applications 先进飞机应用中的监督能源管理
Pub Date : 2018-06-01 DOI: 10.23919/ECC.2018.8550103
A. Cavallo, Giacomo Canciello, A. Russo
A control strategy is proposed for energy management onboard the innovative More Electric Aircraft (MEA) concept. The objective is to reduce generator sizing (and weight onboard) by using battery packs as extra-energy sources. The flow of energy is regulated by a Buck-Boost Converter Unit (BBCU), suitably driven. The controller is composed of a two-layers architecture, where the bottom layer is devoted to current-tracking purposes, while the upper level takes care of the safe switching between the different control objectives. Rigorous stability tools are presented for both controllers, based on the Theory of Sliding Mode Control and of Common Lyapunov Functions. Detailed simulation with switching power electronic components show the effectiveness of the proposed approach.
提出了一种用于新型多电动飞机(MEA)能量管理的控制策略。目标是通过使用电池组作为额外的能源来减少发电机的尺寸(和重量)。能量流由Buck-Boost转换器单元(BBCU)调节,适当驱动。该控制器由两层结构组成,其中底层用于电流跟踪,而上层负责不同控制目标之间的安全切换。基于滑模控制理论和常用李雅普诺夫函数,给出了两种控制器的严格稳定性工具。对开关电力电子器件进行了详细的仿真,验证了该方法的有效性。
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引用次数: 7
Film growth minimization in a Li-ion cell: a Pseudo Two Dimensional model-based optimal charging approach 锂离子电池膜生长最小化:基于伪二维模型的最佳充电方法
Pub Date : 2018-06-01 DOI: 10.23919/ECC.2018.8550404
Andrea Pozzi, Marcello Torchio, D. Raimondo
Safety, fast charging and aging are among the most important issues when dealing with high power battery packs in electric and hybrid vehicles. Today’s charging strategies are designed to guarantee safe operation in a conservative way, but are far from being optimal in terms of aging reduction and time charging minimization. For this reason, the interest of the research is focused on developing model-based battery management systems. Comparing standard charging strategies with health-aware optimization-based ones is difficult since they usually provide different charging times: are we willing to charge the battery in more time if this comes with an aging reduction? When a customer is faced with such a question, the answer is not so trivial. For this reason, in this paper we provide health-aware Pseudo Two Dimensional model-based strategies with the same charging time of standard CC-Cv protocols. The results show that significant aging improvements can be obtained, even by constraining the charging time to be the same as the CC-Cv protocol.
在处理电动和混合动力汽车的高功率电池组时,安全性、快速充电和老化是最重要的问题。目前的充电策略以保守的方式保证安全运行,但在减少老化和减少充电时间方面还远远不够理想。因此,研究的兴趣集中在开发基于模型的电池管理系统上。比较标准充电策略和基于健康意识的优化策略是很困难的,因为它们通常提供不同的充电时间:如果电池老化减少,我们愿意花更多的时间给电池充电吗?当客户面对这样的问题时,答案并不是那么微不足道。因此,本文提供了基于健康感知的伪二维模型策略,该策略具有与标准CC-Cv协议相同的充电时间。结果表明,即使将充电时间限制在与CC-Cv协议相同的条件下,也可以获得显著的老化改善。
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引用次数: 19
Interval observers design for discrete-time linear switched systems 离散线性切换系统的区间观测器设计
Pub Date : 2018-06-01 DOI: 10.23919/ECC.2018.8550491
Ghassen Marouani, T. N. Dinh, T. Raïssi, H. Messaoud
The main goal of this paper is to present a methodology to design interval observers for discrete-time linear switched systems affected by disturbances and measurement noises which are considered bounded but unknown. The steps to design these observers are detailed. Furthermore, to relax some restrictive conditions, a change of coordinates is recommended. Keywords: Interval observer, discrete-time, linear systems, switched systems, LMI.
本文的主要目的是提出一种方法来设计受干扰和测量噪声影响的离散时间线性切换系统的区间观测器,这些系统被认为是有界但未知的。详细介绍了设计这些观察器的步骤。此外,为了放宽一些限制条件,建议改变坐标。关键词:区间观测器,离散时间,线性系统,切换系统,LMI。
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引用次数: 8
Robust H2 control of ladder circuits modeled as a subclass of 2D systems 作为二维系统子类建模的阶梯电路的鲁棒H2控制
Pub Date : 2018-06-01 DOI: 10.23919/ECC.2018.8550452
B. Sulikowski
Spatially interconnected systems are the special case of 2D systems, since there exist 2 independent variables in the model. In the paper RLC ladder circuit uncertain model is taken as a particular case of such systems. Due to the model structure and uncertainties solving problems of stability testing and stabilization for such models requires developing its own, 2D based, approach. Hence on, a short introduction into 2D system theory is provided, then a methodology towards stability analysis and stabilizing controller design with the application of Linear Matrix Inequalities (LMI) techniques are presented. The main results of this paper is providing the solution for problems of the robust control and $H_{2}$ robust control of ladder circuits in terms of LMIs.
空间互联系统是二维系统的特殊情况,因为模型中存在两个自变量。本文以RLC梯形电路不确定模型为这类系统的一个特例。由于模型结构和不确定性,解决此类模型的稳定性测试和稳定问题需要开发自己的基于二维的方法。因此,简要介绍了二维系统理论,然后提出了一种应用线性矩阵不等式(LMI)技术进行稳定性分析和稳定控制器设计的方法。本文的主要成果是给出了梯形电路在lmi方面的鲁棒控制和$H_{2}$鲁棒控制问题的解决方案。
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引用次数: 7
Price Management in Resource Allocation Problem with Approximate Dynamic Programming 基于近似动态规划的资源配置问题中的价格管理
Pub Date : 2018-06-01 DOI: 10.23919/ECC.2018.8550559
A. Forootani, M. Tipaldi, D. Liuzza, L. Glielmo
The problem of managing the price for resource allocation arises in several applications, such as purchasing plane tickets, reserving a parking slot, booking a hotel room or renting SW/HW resources on a cloud. In this paper, we model a price management resource allocation problem with parallel Birth-Death stochastic Processes (BDPs) to account for the fact that the same resource can be possibly purchased by customers at different prices. In addition, customers can hold the resource at the purchase price to the necessary extent. The maximization of the revenue in both the finite and infinite time horizon cases is addressed in this paper with Stochastic Dynamic Programming (DP) approaches. To overcome the difficulty in solving the corresponding optimization problem due to the state space explosion, Approximate Dynamic Programming (ADP) techniques (in particular, the Least Square Temporal Difference method along with Monte Carlo simulations) are adopted. Furthermore, a MATLAB Toolbox is developed with the aim of solving stochastic DP/ADP problems and supporting probabilistic analysis. Extensive simulations are performed to show the effectiveness of the proposed model and the optimization approach.
管理资源分配价格的问题出现在几个应用程序中,例如购买机票、预订停车位、预订酒店房间或租用云上的SW/HW资源。为了考虑同一资源可能被不同的消费者以不同的价格购买,本文建立了一个具有并行生灭随机过程(BDPs)的价格管理资源分配问题模型。此外,客户可以在必要的程度上以购买价格持有资源。本文用随机动态规划(DP)方法研究了有限和无限时间范围下的收益最大化问题。为了克服状态空间爆炸带来的求解相应优化问题的困难,采用了近似动态规划(ADP)技术(特别是最小二乘时间差分法和蒙特卡罗模拟)。在此基础上,开发了求解随机DP/ADP问题和支持概率分析的MATLAB工具箱。大量的仿真表明了所提出的模型和优化方法的有效性。
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引用次数: 0
Integer-Free Optimal Scheduling of Smart Appliances 智能家电的无积分优化调度
Pub Date : 2018-06-01 DOI: 10.23919/ECC.2018.8550348
Felix Petzke, S. Streif
With the growing number of smart appliances in the electrical grid, flexible optimization techniques capable of scheduling large scale systems of such devices are needed in order to control them optimally. However, scheduling approaches in the literature predominantly use mixed-integer formulations with fixed time slots. This usually yields a poor scalability due to the computational complexity of the resulting mixed-integer optimization problems. Furthermore this approach can be rather inflexible since it restricts the task executions to specific time intervals. This may become problematic if the (actual) optimal task execution would only span a fraction of one time slot, as it might happen for applications with very short individual tasks.This paper presents an optimization based scheduling approach that creates a continuous schedule, i.e. the task execution is not bound to specific time slots. Furthermore, no integer variables are used in the process. This makes it not only applicable to processes with arbitrarily short execution time lengths, but also has the potential of a reduced computational complexity compared to mixed-integer based approaches. Preliminary case studies demonstrate the advantages of the proposed approach.
随着电网中智能设备数量的不断增加,需要能够对此类设备的大规模系统进行调度的灵活优化技术,以便对其进行最佳控制。然而,文献中的调度方法主要使用固定时隙的混合整数公式。由于混合整数优化问题的计算复杂性,这通常会导致较差的可伸缩性。此外,这种方法可能相当不灵活,因为它将任务执行限制在特定的时间间隔内。如果(实际的)最佳任务执行只跨越一个时隙的一小部分,这可能会成为问题,因为对于具有非常短的单个任务的应用程序可能会发生这种情况。本文提出了一种基于优化的调度方法,该方法创建了一个连续的调度,即任务的执行不受特定时间段的约束。此外,该过程中没有使用整数变量。这使得它不仅适用于执行时间长度任意短的进程,而且与基于混合整数的方法相比,它还具有降低计算复杂性的潜力。初步的案例研究证明了所提出方法的优点。
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引用次数: 0
A Quantification of the Performance Loss of Power Averaging in Airborne Wind Energy Farms 机载风力发电场功率平均性能损失的量化
Pub Date : 2018-06-01 DOI: 10.23919/ECC.2018.8550357
E. Malz, Mario Zanon, S. Gros
Airborne wind energy (AWE) is a promising source of renewable energy, with a potential of offering great and reliable energy yields. However, in addition to the usual power intermittency of renewable source of energies, AWE systems have a large and periodic fluctuation of their power output, and even consume power at certain phases of their orbit in some modes of power generation. These fluctuations may become a significant obstacle to a large-scale deployment of AWE systems in the power grid. For a large AWE farm, these fluctuations can be mitigated by power averaging, at the expense of fixing the AWE systems orbit times. This requirement removes the possibility for individual AWE systems within a wind farm to optimize their orbit time for their specific, local wind conditions, entailing a loss of performance. In order to assess the viability of mitigating the power fluctuation by power averaging at the wind farm level, this paper quantifies the loss of performance it yields.
空中风能(AWE)是一种很有前途的可再生能源,具有提供巨大而可靠的能源产量的潜力。然而,AWE系统除了具有可再生能源通常的电力间歇性外,其输出功率还存在较大的周期性波动,在某些发电模式下,甚至在其运行轨道的某些阶段会消耗电力。这些波动可能成为在电网中大规模部署AWE系统的重大障碍。对于大型AWE农场,可以通过功率平均来减轻这些波动,但代价是固定AWE系统的轨道时间。这一要求消除了风电场内单个AWE系统根据其特定的当地风力条件优化其轨道时间的可能性,从而导致性能损失。为了评估在风电场水平上采用功率平均法缓解功率波动的可行性,本文量化了其产生的性能损失。
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引用次数: 8
Merging Vehicles at Junctions using Mixed-Integer Model Predictive Control 基于混合整数模型预测控制的交叉口合流车辆
Pub Date : 2018-06-01 DOI: 10.23919/ECC.2018.8550577
Csaba Bali, Arthur G. Richards
A method is proposed for vehicle merging scenarios in junctions with relative cost prioritization. The method is based on Model Predictive Control, employing Mixed Integer Quadratic Program optimization. The scheme provides optimal control properties while maintaining safety and recursive feasibility. The latter properties are ensured through positive control invariance of simple time headway constraints. For examples with two vehicles, tunable prioritization and gap acceptance are verified and presented on a decision graph. Priorities are then demonstrated to be respected in an example with four vehicles.
提出了一种具有相对成本优先级的交叉口车辆合并方案。该方法基于模型预测控制,采用混合整数二次规划优化。该方案在保证安全性和递归可行性的同时,提供了最优的控制特性。后一特性是通过简单车头时距约束的正控制不变性来保证的。例如,有两个车辆,可调整的优先级和缺口接受被验证并呈现在决策图上。然后以四辆车为例,证明优先级得到尊重。
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引用次数: 10
Approximated solutions to the nonlinear H2 and H∞ control approaches formulated in the Sobolev space* Sobolev空间*中非线性H2和H∞控制方法的近似解
Pub Date : 2018-06-01 DOI: 10.23919/ECC.2018.8550612
D. Cardoso, G. Raffo
Two important paradigms in control theory are the classical nonlinear $mathcal{H}_{2}$ and $mathcal{H}_{infty}$ control approaches. Their efficiency have already been demonstrated in several applications and the background theory is well developed. Despite their many advantages, they suffer from deficiencies such as minimum settling-time and minimum overshoot. An interesting approach to solve these lacks is the formulation of both controllers in the Sobolev space. Thanks to the nature of the $mathcal{W}_{1,2} -$ norm, the cost variable and its time derivative are taken into account in the cost functional, leading to improved transient and steady-state performance. Nevertheless, the HJB and HJBI equations that arises from the problem formulation in the Sobolev space are very hard to solve analytically. This work proposes an approach to approximate their solutions by adapting the classical Successive Galerkin Approximation Algorithms (SGAA). Numerical experiments are used to corroborate the proposed approach capacity to deal with underactuated systems when controlling the two-wheeled self-balanced vehicle.
控制理论中的两个重要范式是经典的非线性$mathcal{H}_{2}$和$mathcal{H}_{infty}$控制方法。它们的有效性已经在一些应用中得到了证明,背景理论也得到了很好的发展。尽管它们有许多优点,但也存在沉降时间最短、超调最小等缺点。解决这些不足的一个有趣的方法是在Sobolev空间中表述两个控制器。由于$mathcal{W}_{1,2} -$范数的性质,在代价泛函中考虑了代价变量及其时间导数,从而改善了暂态和稳态性能。然而,从Sobolev空间的问题表述中产生的HJB和HJBI方程很难解析求解。这项工作提出了一种方法来近似他们的解决方案,采用经典的连续伽辽金近似算法(SGAA)。数值实验验证了该方法在控制两轮自平衡车辆时处理欠驱动系统的能力。
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引用次数: 1
Interval State Estimation of Hydraulics in Water Distribution Networks 配水管网液压系统的区间状态估计
Pub Date : 2018-06-01 DOI: 10.23919/ECC.2018.8550291
Stelios G. Vrachimis, S. Timotheou, Demetrios G. Eliades, M. Polycarpou
Water distribution networks are critical infrastructure systems, which are required to reliably deliver water to consumers. Hydraulic state estimation of flows and pressures is key for the efficient and dependable operation of water systems. However, in practice, hydraulic state estimation is a challenging task due to the scarcity of sensors compared to system states and the presence of several modeling uncertainties. It is a common practice for historical data to be used in the place of missing measurements, however the lack of a statistical characterization for the error of these measurements results in having no knowledge of the state estimate error magnitude. This paper presents a methodology for generating hydraulic state bounding estimates by modeling measurement and parametric uncertainties as intervals. The resulting nonlinear interval hydraulic equations are re-formulated using bounding linearization, a technique that restricts the nonlinearities within a convex set, and solved using linear optimization. An iterative procedure improves the bounding linearization, converging to the tightest possible bounds. Simulation results demonstrate that the proposed methodology produces tight state bounds and can be successfully used to detect water leakages in the network.
供水网络是关键的基础设施系统,需要可靠地向消费者供水。流量和压力的水力状态估计是水系统高效可靠运行的关键。然而,在实践中,由于与系统状态相比传感器的稀缺性以及存在一些建模不确定性,液压状态估计是一项具有挑战性的任务。使用历史数据代替缺失的测量是一种常见的做法,然而,由于缺乏对这些测量误差的统计特征,导致不知道状态估计误差的大小。本文提出了一种以建模测量和参数不确定性为区间的水力状态边界估计方法。由此产生的非线性区间水力方程使用边界线性化(一种将非线性限制在凸集内的技术)重新制定,并使用线性优化求解。迭代过程改进了边界线性化,收敛到可能的最紧边界。仿真结果表明,该方法产生了严密的状态边界,可以成功地用于检测网络中的漏水。
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引用次数: 1
期刊
2018 European Control Conference (ECC)
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