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The analysis and validation of innovative methods and concepts for distribution grids like smart-grid approaches require a realistic representation of the grid structure. However, the availability of real grid data for distribution grids is insufficient. Therefore, a method for the generation of model grids for all distribution grid voltage levels is developed, utilizing publicly available map data...
A new transistor model is used for design of two LDO regulators using a differential stage loaded by a current amplifier and the voltage feedback. The first LDO has a constant bias current, the second LDO has an additional adaptable bias circuit controlled by the load current. The LDOs are analyzed and compared. When the load is absent, the transistors in both circuits are operating in weak inversion;...
A novel adaptive battery system with two battery sources is proposed to provide multiple output levels and increased benefits when integrated with multi-level inverters by improving the batteries' state of health (SOH) and state of charge (SOC). Applications of this topology include dynamic hybrid battery/inverter and photovoltaic/inverter systems. The system has been modeled and validated using Matlab...
Short-term electric load forecast is extremely important for the security management and cost control of the electric power industry, and thus it is of great significance to improve the forecast accuracy. Adaptive network-based fuzzy inference system (ANFIS) model, which combines the self-learning ability of neural network and the logical reasoning ability of fuzzy system, has some advantages in performance...
This paper deals with the creation of the behavior model and the model of the biological-psychical state of the fighting pilot. Creating of the biological-psychical state model of the pilot is a part of the research activities on the Air Force and Air Technology Department. The aim of the project is to solve the role of the pilot in the interface human — machine (pilot — fighter). Using of the adaptable...
Distributed generation systems are a suitable alternative for the rational use of energy. One of important aspect in these systems corresponds to the modeling of the transmission system and its loads which are usually variable. Neuro-fuzzy systems are an alternative for modeling and control of complex systems, allowing the adaptability of their parameters using data. This article shows the modeling...
In this paper, a new method based on Group Method of Data Handling (GMDH), Improved Particle Swarm Optimization (PSO), and Least Squares Support Vector Machine (LSSVM) is proposed to solve the problem in power load forecasting, which is difficult to determine the input node and model parameters of minimum support vector machine (LSSVM) modeling. The specific method is as follows: firstly, the authors...
Since all of adaptive models converge to the same point in parameter space, classical second level multiple model adaptive control method cannot deal with linear time-varying system. In order to deal with this drawback, this paper proposes a modified second level adaptive control method based on combining the advantages of adaptive model and fixed model for a class linear discrete time-varying plant...
This work report an industrial application of model predictive control (MPC) to a 600 MW coal fired electrical power plant. The coordinated control system (CCS) is the most important part of the project. Dynamic models are obtained using multivariable closed-loop identification. In MPC control, plant nonlinearity caused by load changes is treated using simple LPV model. Initial tests to the power...
Large-scale software systems like Amazon and healthcare.gov are used by thousands or millions of people every day. To ensure the quality of these systems, load testing is a required testing procedure in addition to the conventional functional testing techniques like unit and system integration testing. One of the important requirements of load testing is to create a field-like test environment. Unfortunately,...
Recently, many researches have been done related with the integration of distributed generation in the distribution system. However, in large scale applications, there are several challenges in terms of control design. A simple example is the possibility to operate in island mode or connected to the main power. The operation in island mode requires that power sources should be inserted inside the...
Conventional controllers with fixed tuning fail to perform satisfactorily for processes with time varying nature. In such cases adaptive controllers are preferred as they are capable to provide suitable corrective measure according to the changes of process dynamics and undesired process upsets. In model reference adaptive control (MRAC) desired process output specifications are provided in the form...
Adaptive controllers are becoming popular for industrial closed-loop control applications, especially for various chemical processes. By incorporating adaptation mechanism, controller acquires the ability to cope with varying process dynamics. Model reference adaptive system (MRAS) is one of the most popular adaptive control techniques adopted in process industries. The most important feature of MRAS...
This paper addresses two problems of interest in the present time, namely, the characterization of price variations and the corresponding load response to them. The paper begins by defining Price Elasticity Matrices (PEMs) and shows how they can be used to model demands deviation from their scheduled levels due to price differentials. It then explains the reason as to why extending PEMs characterization...
As the popularity of mobile applications, Wi-Fi has become one of the major access methods for many users. When a large amount of users move in public places together, such as classrooms or meeting rooms, severe load imbalance of Wi-Fi Access Points (APs) and unfair bandwidth allocation are likely to occur consequently. Software Defined Networking (SDN) is a new networking paradigm which allows the...
The research of the cascading failure and the spread of the disease belong to two separate fields. However, in practice, there are many mutual effects between two processes each other. This paper first introduces some basic concepts of complex networks, and analyzes the application of cascading failure model and several typical virus transmission models. Then, based on a spreading model, the interaction...
The article presents the system of ergonomic angular distribution of torque on the pedals in the pedaling-by-wire driven electric vehicle. The work is an attempt to make cycling feelings close to the natural in the presented prototype — as in the typical bicycle. Ergonomic distribution of torque results also in speed fluctuations reducing. The model of pedaling process is shown with introduction of...
The Field Oriented Control (FOC) and the Direct Torque Control (DTC) are the well-known control strategies in the modern AC systems nowadays. However, both of them have a number of limits, such as the dependence on machine parameters of the vector control and the high ripples of DTC. This work presents a hybrid control strategy for induction motor (IM) based on the combining of the two techniques...
Recent studies show that increasing numbers of design bugs are escaping to post-silicon due to the complexity of advanced designs and the lack of adequate verification tools that can validate complex electrical interactions between electrical subsystems on an integrated circuit. In this paper, we present a novel tool for post-silicon validation of mixed-signal/RF circuits through cooperative test...
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