This paper applies time delay approach to control the active power in a grid connected distributed generation unit under varying load conditions. The control algorithm is developed in time domain;therefore, it is (alm...
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ISBN:
(纸本)9781467327275
This paper applies time delay approach to control the active power in a grid connected distributed generation unit under varying load conditions. The control algorithm is developed in time domain;therefore, it is (almost) independent of the frequency and phase of the grid voltage. As a result it does not require frequency measurement, phased locked loop (PLL) system, and dq-transformation which reduces the complexity of the control algorithm. However, it is still possible to control the output voltage, or reactive power, at the common coupling point, independent of the dispatched active power.
In radio resource management for cellular networks a trade-off has to be made between the congestion level, related to cell coverage and intercell interference, and the Quality of Service (QoS) or data rates of the us...
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ISBN:
(纸本)9781612848006
In radio resource management for cellular networks a trade-off has to be made between the congestion level, related to cell coverage and intercell interference, and the Quality of Service (QoS) or data rates of the users. This is implemented by using a fast inner power control loop and an outer rate control algorithm, working on a slower time scale. Due to the distributed nature of the network, both information and control is distributed. Measurements of congestion and QoS are used in the control loops and this introduces a nonlinear feedback. Another complicating factor is that filtering, computations and information exchange in the network introduce time delays. In this paper we propose a general high order model as a cascade system with an outer and inner control loop. The control algorithms use distributed information available in the network. The full system model includes the nonlinear feedback from congestion and QoS measurements, time delays and time scale modelling. We provide sufficient conditions for stability and convergence of the system. Our primary analysis tool is input output theory.
The goal of this paper is to present a novel configuration for a three-rotor mini Unmanned Aerial Vehicle (UAV). The proposed design incorporates advantageous structural features which enhance the maneuverability of t...
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ISBN:
(纸本)9781424420780
The goal of this paper is to present a novel configuration for a three-rotor mini Unmanned Aerial Vehicle (UAV). The proposed design incorporates advantageous structural features which enhance the maneuverability of the rotorcraft. The detailed mathematical model of the vehicle's attitude is obtained through the Newton-Euler formulation. In terms of control, we propose a control law which is robust with respect to dynamical couplings and adverse torques. The vehicle tilts simultaneously the three rotors to stabilize the yaw dynamics. The resulting control algorithm is simple for embedded purposes. A customized low-cost embedded system was developed to test an autonomous stabilized-attitude flight, obtaining satisfactory results.
There have been very few advanced control algorithms developed for small commercial buildings due to practical difficulties such as the spatial comfort variations, significant disturbances, high sensor costs, and high...
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ISBN:
(纸本)9781479917730
There have been very few advanced control algorithms developed for small commercial buildings due to practical difficulties such as the spatial comfort variations, significant disturbances, high sensor costs, and high cost of site-specific engineering solutions. High implementation cost has been a major impediment to successful market penetration. The focus of this work is to develop and demonstrate plug-and-play optimal coordination of multiple roof top units (RTUs). The goal is to minimize the time required to configure the control strategy in order to enable a more cost effective control implementation for small commercial building applications.
A stable adaptive fuzzy control based tracking control is developed for a class of Multi Input Multi Output (MIMO) non square nonlinear systems with external disturbances using sliding mode algorithm. This control alg...
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ISBN:
(纸本)9781424474264
A stable adaptive fuzzy control based tracking control is developed for a class of Multi Input Multi Output (MIMO) non square nonlinear systems with external disturbances using sliding mode algorithm. This control algorithm further justifies that non square systems can be controlled in their original non square form instead of squaring them by adding or eliminating variables. This method integrates adaptive fuzzy systems to approximate the unknown nonlinear functions. Then, in order to reduce the chattering phenomenon without deteriorating the tracking performances, the discontinuous term in the conventional sliding mode technique is replaced by an adaptive Proportional Integral (PI) term. All parameter adaptive laws are derived based on Lyapunov stability analysis. The overall adaptive fuzzy scheme guarantees the convergence to zero of tracking errors as well as the boundedness of all signals in the closed-loop system. The validity of the proposed approach is shown by computer simulations.
In this paper we describe an effort recently completed at UT Dallas to develop a high-fidelity computational fluid dynamics code to test and develop control algorithms aimed at maximizing power production and load mit...
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ISBN:
(纸本)9781479917730
In this paper we describe an effort recently completed at UT Dallas to develop a high-fidelity computational fluid dynamics code to test and develop control algorithms aimed at maximizing power production and load mitigation. Preliminary results of three aligned turbines operating at different tip speed ratios (TSRs) are discussed to show the wealth of details available from the present code. The finer solution of the flow physics allows to gain a better understanding of how control algorithms should be designed and implemented in practical configurations. The paper includes a detailed analysis of the power and loads for optimal TSRs obtained by applying dynamic programming to a low-fidelity analytical model.
This paper investigates the possibility of providing aggregated regulation services with small loads, such as water heaters or air conditioners. A direct-load control algorithm is presented to aggregate the water heat...
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ISBN:
(纸本)9781457710001
This paper investigates the possibility of providing aggregated regulation services with small loads, such as water heaters or air conditioners. A direct-load control algorithm is presented to aggregate the water heater load for the purpose of regulation. A dual-element electric water heater model is developed, which accounts for both thermal dynamics and users' water consumption. A realistic regulation signal was used to evaluate the number of water heaters needed and the operational characteristics of a water heater when providing 2-MW regulation service. Modeling results suggest that approximately 33,000 water heaters are needed to provide a 2-MW regulation service 24 hours a day. However, if water heaters only provide regulation from 6:00 to 24:00, approximately 20,000 will be needed. Because the control algorithm has considered the thermal setting of the water heater, customer comfort is maintained. Therefore, the aggregated regulation service provided by water heater loads can become a major source of revenue for load-serving entities when the smart grid enables the direct load control.
A typical DC microgrid, which can be enabled by Solid State Transformer (SST), is investigated in this paper. One unidirectional DC/DC converter for photovoltaic (PV), one bidirectional DC/DC converters for battery, a...
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ISBN:
(纸本)9781479903375
A typical DC microgrid, which can be enabled by Solid State Transformer (SST), is investigated in this paper. One unidirectional DC/DC converter for photovoltaic (PV), one bidirectional DC/DC converters for battery, and a SST based on distribution system level, are included in the proposed DC microgrid system. In order to manage the system operation, a distributed power management strategy is proposed. In the proposed control algorithm, not only the DC microgrid system can interface to the distribution system, but each module in the system can be distributed based on its own characteristics. Experimental results verify that the proposed power management strategy can be applied to a DC microgrid stably and achieve good performance.
The Multiphase Latent Variable Model Predictive control (MLV-MPC) is developed based on the Principal component analysis (PCA) model. The proposed control methodology is capable of trajectory tracking as well as distu...
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ISBN:
(纸本)9781424445233
The Multiphase Latent Variable Model Predictive control (MLV-MPC) is developed based on the Principal component analysis (PCA) model. The proposed control methodology is capable of trajectory tracking as well as disturbance rejection. The model that is used in the course of MPC is a multiphase PCA model that is constructed based on the available data from the measurements on the process. Different data arrangements are studied and their effects on the performance of the control algorithm are evaluated.
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