This paper presents the average power balancing (APB) control method for the modular multilevel cascaded converter (MMCC) based on single-star bridge cells (SSBC) in the static synchronous compensator (STATCOM) applic...
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ISBN:
(纸本)9781479903375
This paper presents the average power balancing (APB) control method for the modular multilevel cascaded converter (MMCC) based on single-star bridge cells (SSBC) in the static synchronous compensator (STATCOM) applications. The proposed APB control accomplishes both the reactive power injection and all the dc voltage balancing control at the same time. These functionalities also work even as grid voltage sag occurs. The control algorithm is verified with a 220-V 1kVA STATCOM based on MMCC-SSBC, and the test results show that all the dc voltages are still regulated at the commanded value even in the unbalanced grid voltages.
the authors introduce a multifunctional control research test bench and its data management and interface system. They implemented a building monitoring, control, and interface system (MCIS) used for evaluation of com...
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ISBN:
(纸本)9781479902255
the authors introduce a multifunctional control research test bench and its data management and interface system. They implemented a building monitoring, control, and interface system (MCIS) used for evaluation of complex building energy systems, for optimization of such energy systems and for carrying out control research experiments. In this paper they explain the MCIS' architecture and functionality, they present its research potential and three different control research use cases for building energy systems and heating, ventilation, and air conditioning (HVAC) systems;model-assisted control parameter fine tuning, model-based predictive control, and demonstration of adaptive control algorithms. The authors outline prerequisites for implementation, demonstration, and evaluation of new developed control algorithms and strategies. These prerequisites are fulfilled via system expansions providing a flexible demonstration bench.
The proliferation of modern smartphones has given rise to Public Sensing, a new paradigm for data acquisition systems utilizing smartphones of mobile participants. In this paper, we present DrOPS, a system for improvi...
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ISBN:
(纸本)9781467345736
The proliferation of modern smartphones has given rise to Public Sensing, a new paradigm for data acquisition systems utilizing smartphones of mobile participants. In this paper, we present DrOPS, a system for improving the efficiency of data acquisition in Public Sensing systems. DrOPS utilizes a model-driven approach, where the number of required readings from mobile smartphones is reduced by inferring readings from the model. Furthermore, the model can be used to infer readings for positions where no sensor is available. The model is directly constructed from the observed phenomenon in an online fashion. Using such models together with a client-specified quality bound, we can significantly reduce the effort for data acquisition while still reporting data of required quality to the client. To this effect, we develop a set of online learning and control algorithms to create and validate the model of the observed phenomenon and present a sensing task execution system utilizing our algorithms in this paper. Our evaluations show that we obtain models in a matter of just hours or even minutes. Using the model-driven approach for optimizing the data acquisition, we can save up to 80% of energy for communication and provide inferred temperature readings for uncovered positions matching an error-bound of 1℃ up to 100% of the time.
This paper introduces a novel methodology to assist the evaluation of control algorithms for MAVs (Micro Aerial Vehicles) using Software-in-the-Loop (SiL) based flight simulation. The originality of this paper is to u...
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ISBN:
(纸本)9781467318129
This paper introduces a novel methodology to assist the evaluation of control algorithms for MAVs (Micro Aerial Vehicles) using Software-in-the-Loop (SiL) based flight simulation. The originality of this paper is to use Microsoft Flight Simulator (MSFS) as the environment to embed both the dynamic and graphic models of Ascending Technologies Pelican MAV flying robot. The resulting is a reliable model of the Pelican quadrotor. The full duplex communication between the virtual aircraft and the control algorithm is achieved by a custom C++/C software named FVMS (Flight Variables Management System), developed by Aerial Robots Team (ART), which is able to reach (read/write) a great number of flight variables from MSFS. To illustrate the effectiveness of such method, we first completely present FVMS architecture and main features. Later, the synthesis and then the application of the optimal H_∞ robust control algorithm and its operation into the FVMS SiL context are explained. Regarding MAVs control evaluation, SiL simulation considerably contributes to save battery time, to ease control synthesis and prototyping and to prevent accidents during tests with the real robot. The final goal is to evaluate the stability of the Pelican platform in hovering tasks in flight simulation focusing on the efficiency of FVMS to properly run the optimal H_∞ robust control algorithm. The SiL control of the MAV has proven FVMS capabilities, which may be extended to assist the design of other classes of controllers.
This paper proposes a nonlinear control for a dual active bridge converter (DAB) using properties of flatness system. This converter system is used for a DC microgrid. Losses in the system are modeled as a resistance ...
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ISBN:
(纸本)9781479902255
This paper proposes a nonlinear control for a dual active bridge converter (DAB) using properties of flatness system. This converter system is used for a DC microgrid. Losses in the system are modeled as a resistance connected in parallel with the output capacitor. The control algorithm also takes this resistance into account. With a small-scale test bench, bidirectional power flow capability is demonstrated. The effectiveness of the proposed system is demonstrated through experimental results.
This paper extends the gossip algorithm, widely studied in the literature on distributed computing and control algorithms, to networks of quantum systems. In doing so, we reinterpret the classical algorithm and the av...
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ISBN:
(纸本)9781467357159
This paper extends the gossip algorithm, widely studied in the literature on distributed computing and control algorithms, to networks of quantum systems. In doing so, we reinterpret the classical algorithm and the average consensus task as a symmetrization problem with respect to the action of the permutation group. This allows us to extend in a natural way the gossip consensus algorithm to the quantum setting and prove its convergence properties to symmetric states while preserving the expectation of permutation-invariant global observables.
We investigate a control system implemented with a stochastic scheduler on a modern microprocessor where the clock frequency of the microprocessor can be adjusted in real-time. We consider the case when the microproce...
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ISBN:
(纸本)9781479901777
We investigate a control system implemented with a stochastic scheduler on a modern microprocessor where the clock frequency of the microprocessor can be adjusted in real-time. We consider the case when the microprocessor clock frequency may be set so low that the control algorithm occasionally fails to generate an updated control signal in the time allotted to it by the operating system. We seek to understand the relationships between energy consumption, closed-loop performance, and a control signal that is occasionally not updated by the control system. We provide stability and H_∞ performance results for a class of jump linear systems governed by time-inhomogeneous stochastic processes.
Interference in wireless networks has been identified as one of the main hurdles towards achieving higher network capacity. However, most of the literature has focused on solving interference problems assuming that in...
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ISBN:
(纸本)9781479903573
Interference in wireless networks has been identified as one of the main hurdles towards achieving higher network capacity. However, most of the literature has focused on solving interference problems assuming that interference is non-bursty. In this paper, we study bursty interference channels and propose novel interference-aware rate control algorithms. The proposed algorithms include single and multi-layer transmission schemes. We also present a framework for optimizing rate selection so that the overall throughput is maximized. Significant performance gains relative to traditional Hybrid Adaptive Repeat reQuest (HARQ) schemes are demonstrated.
A networked traffic control scheme is presented in this paper. We refer to a realistic case in which the control actions are computed in a control center located far from the traffic system and then transmitted, throu...
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ISBN:
(纸本)9781479901777
A networked traffic control scheme is presented in this paper. We refer to a realistic case in which the control actions are computed in a control center located far from the traffic system and then transmitted, through a wireless communication channel, to the actuators placed along the road, i.e. on-ramp traffic lights in the considered case of ramp metering control. More specifically, we assume that the communication channel is affected by delays and packet loss. We propose to adopt a control strategy of model predictive control (MPC) nature based on the use of a buffer to compensate for the time delays, so that the designed traffic networked control scheme provides performance significantly close to those of the ideal case (i.e. that with no delay). Moreover, in order to limit the computational load, a modified version of the control strategy is proposed, in which the length of the optimization horizon of the predictive control algorithm, and, consequently, the buffer length, is updated relying on a delay estimation. A simulation analysis of the different networked control proposals applied to a Dutch freeway is provided, along with the comparison with a conventional MPC equipped with an hold mechanism. The superiority in terms of performance of the proposed networked MPC with adaptive buffer length is apparent.
This paper deals with the development of a new hybrid topology for voltage regulation in micro hydro power station using self-excited induction generation applied in three-phase four-wire systems. The proposed topolog...
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ISBN:
(纸本)9781479902255
This paper deals with the development of a new hybrid topology for voltage regulation in micro hydro power station using self-excited induction generation applied in three-phase four-wire systems. The proposed topology is a combination of a three-phase four legs static synchronous compensator (STATCOM) and capacitor banks connected in parallel to the AC voltage bar. It is considered a three wires generator with no accessible neutral point being the neutral terminal for the load created through the neutral terminal of the excitation capacitor and the controller, which provides the choice to connect the loads either star or delta configurations. A control algorithm and a project for the variable capacitors are proposed based on the specifications of the STATCOM. The proposed generating system is modeled and simulated in MATLAB. Simulation results and preliminary experimental results are presented to demonstrate the performance of the proposed new hybrid method for the voltage regulation of the self-excited induction generator as well as to demonstrate the capability of an isolated generating system for feeding three-phase balanced loads.
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