Kinds Of Control Modes Research Articles

Optimized Daily Dispatching Strategy of Building- Integrated Energy Systems Considering Vehicle to Grid Technology and Room Temperature Control

With the development of vehicle-to-grid (V2G) technology, electric vehicles (EVs) are not only a promising transportation solution, but also can be used as mobile energy storage and spinning reserves, which play an important role in building-integrated energy systems (BIESs) and can further promote energy efficiency. Considering the space-time characteristics of EVs and the room temperature demand, this study establishes a planning model using V2G technology to minimize daily dispatch cost. Four kinds of control modes were proposed, combining the technology of the resident-owned and staff-owned EVs, in combination with the internal heating and power supply system. In this paper, the operating state of the system and the interaction of the equipment are analyzed under different charging and discharging control modes of EVs. The economics of the microgrid of the comprehensive energy building under four control modes are also discussed. Simulation results indicate that the combined control mode of residential vehicle and office vehicle is optimal for building an integrated energy microgrid, and the room temperature requirements can also be used as an important income source for building the microgrid.

Hierarchical hybrid control strategy for micro‐grid switching stabilisation during operating mode conversion

This study proposes a hierarchical hybrid control strategy to ensure stabilisation performance during the micro-grid operating mode conversion. Designing the hierarchical hybrid control strategy is divided into two stages. In the first stage, the research focuses on constructing a hybrid control scheme, where besides that the storage I unit needs to implement switching control strategy by means of an upper-level switching controller, the storage II unit that acts as a master unit also needs to be switched between two kinds of control modes including voltage-frequency droop control and PQ control in response to different micro-grid operating modes, and other slave distributed generation (DG) units operate in PQ control mode all the time. Moreover, during the operation mode conversion, according to the assessment indexes regarding voltage and frequency, the upper-level switching controller determines whether and when to send switching commands to the master DG unit. In the second stage, the research focuses on designing the hierarchical control strategies in the PQ control mode and the voltage-frequency droop control mode, as well as designing the upper-level switching controller to guarantee the stabilisation performance of the micro-grid during operation mode conversion. In the PQ control mode, all controllers are designed as a fractional order proportional-integral-derivative (FOPID) controller. Finally, the validity of the proposed hybrid control strategy is demonstrated by means of simulation results.

Study on Application of Intelligent Adaptive Genetic Algorithm of Electric Vehicle Charging System Based on

Load with uncertain factors in time and space charge electric cars, electric vehicle charging mass disorder will lead to peak distribution network load exceeds the limit device allowed, and will bring the serious influence to power grid operation. By smoothing the distribution network daily load curve as the optimization objective, is established considering electric vehicle intelligent electric vehicle charging demand constraint of each user charge control strategy to solve the model, and use adaptive genetic algorithm to solve. Through the IEE33 node distribution network system as an example, the use of car grid Monte Carlo stochastic simulation scene based on the comparative study of the disorder, charging and intelligent charging two kinds of control mode, the influence factors of electric vehicle load on the distribution network, thus validating the use of the proposed method is effectiveness and reliability to achieve smooth load.

Software Design and Implementation in Simulation of Manipulator Control System

Manipulator has been widely used in industrial production because it can reduce labor intensity, improve the machining accuracy and reduce the number of dangerous operations manual operation. There are many kinds of control modes for manipulator trajectory. The PLC due to characteristics of low cost, simple structure, repeatable use, flexible programming ,it widely used in the control of the manipulator. This paper focus on the the software design and implementation. Through the simulation of the control system of manipulator, the PLC program design, debugging and running can achieve the expected control purpose and requirements, make the motion trajectory of manipulator in accordance with the relevant provisions. Based on the PLC programming, the manipulator can run in accordance with the requirements of running track.BackgroundWith the progress of science and technology, industrial production automation equipment demand is increasing day by day. Due to the reduction of labor intensity, improve the machining accuracy and less manual intervention operation risk, the manipulator has been more widely used in all walks of life.

Linear Motor Control Algorithm and Experimental Research Based on Feedforward Fuzzy PID

In this paper, theory analysis, the MATLAB research and experimental verification about feedforward fuzzy PID control have been performed by combining the characteristics of the PID, feedforward control and fuzzy control. Simulation results show that the feedforward fuzzy PID control could improve the response speed of the system and reduce the tracking error of the system which shows the obvious superiority compared with the PID, feedforward PID, and fuzzy PID. Load experiment for such four kinds of control modes is done on the linear motor platform, and the experimental results show that the accuracy of the feedforward fuzzy PID control is obviously higher than the other three kinds of control modes and the feedforward fuzzy PID control is easier to be implemented. The position error of feedforward fuzzy PID control is changeless during the load change, and the change of the speed tracking error is small, which proves that the feedforward fuzzy PID control is suitable for the condition of load change or the great disturbance.

Comparison of Control Methods of Permanent Magnet Synchronous Motor in Electric Vehicle

At present, the pure electric vehicles with a permanent magnet synchronous motor (PMSM) vector control (VC) and direct torque control (DTC) are mainly control method. These two kinds of control mode are considered as a high performance PMSM control strategy which has been widely used in practice [5]. Starting from the mathematical model of PMSM, two kinds of control strategies are to be the theoretical analysis, so that the control thoughts and the composition of control system has a profound understanding to applies two kinds of strategies to control of PMSM. Simulink modeling and simulation results proved that vector control is better than that of direct torque.

Organize Method on Platform of Machine Automation Control System

In the process of mechanical automation, due to the development of drive equipment in diversification, miniaturization, digitalization, intellectualization and the development of sensor in miniaturization, digitalization, visualization, on the one hand, automation mechanical structure become simple, on the other hand, with the increase of the dependence on control equipment for automation machinery, an automated machinery needs many kinds of control mode and means to complete the production. With the improvement of mechanical motion complexity, there will appear accumulation phenomenon of control equipment, in addition, in order to complete the data transfer between all kinds of control equipments, each control equipment need to build all kinds of communication protocol and special cables to connect. In order to solve the "accumulation" phenomenon, control equipment manufacturers competing to launch the new scheme. In this paper, a control project based on the control products of Mitsubishi electric company was proposed, which illustrates the change of the control way of mechanical automation. Once you master the control platform of these companies, will be able to build or integrate corresponding control system.

Greenhouse Monitoring and Control System Based on Zigbee

A greenhouse monitoring and control system based on Zigbee networks was developed. This system consists of greenhouse data acquisition controller and greenhouse remote monitoring and control software. The system could monitor temperature and humidity, soil water content and concentration of carbon dioxide in greenhouse and could save these greenhouse data to database. Greenhouse acquisition controller had two kinds of control modes, including local manual control mode and remote wireless control mode in monitoring center. Greenhouse remote monitoring and control software can collect, display and record the collected data, also can control greenhouse environment. According to the current indoor temperature, the target temperature and the offset temperature, PID control method is used for temperature control in greenhouse. The system is implemented using low power wireless components, and easy to be installed. A good wireless solution is provided by this system for centralized management of the greenhouse group.

Tracking control for a hypersonic air-breathing vehicle with thrust vectoring nozzles

Based on the tracking control theory, this paper investigates the control problems of hypersonic air-breathing vehicle with thrust vectoring nozzles. First of all, dynamic model of hypersonic air-breathing vehicle with thrust vectoring nozzles is constructed. And the thrust vectoring nozzles have significant contribution on longitudinal torque, whereas, they have little effect on speed in this model. For the same control parameters, three different tracking control modes are given in detail. The tracking control laws with the switch are designed by means of the pole placement and Youla parameters, which can ensure smooth transition between different control modes, and the stability of closed-loop system. Numerical results show that the thrust vectoring nozzles have certain advantages in the control of hypersonic vehicle. And it is concluded that it is of significance for the attitude control of hypersonic air-breathing vehicle to coordinate many kinds of control modes.

Five Level Photovoltaic Grid-Connected Inverter Based on Repetitive and PI Control

Introducing a kind of bidirectional switch type five level inverter, and put forward the compound control scheme which repetitive control and PI adjustment are combined. This kind of control mode can enables the system has excellent static and dynamic characteristics, to improve the inverter control precision. The results show that, the five-level inverter which using repetitive PI control, its output grid-connected current waveform stability, harmonic distortion rate is small, and can real-time tracking the network voltage.

Study on DVR Based Fault Current Limiter

According to the operation principle of the DVR and analyzing of FCL’ s (fault current limiter) control objectives, this paper presents a new way that can fulfill the multiple control of the DVR. By using different kinds of control modes, it can make the DVR do the same way as FCL. It also establishes a single phase model basing on this theory. At last, it points out the future application of this new theory.

A description of the ITER's gas injection systems and current R&D activities

The gas injection system (GIS) is an indispensable part of ITER fueling system. It deliveries the necessary gas species from tritium plant to vacuum vessel, pellet injection system or neutral beam for plasma operation and fusion power shutdown. In this paper, the current design status of GIS, including the previous design changes, is briefly described. As the GIS design justification and support, the experimental study on GIS response time is illustrated. The factors delayed the GIS response time are identified, and two kinds of control mode are proved to be effective for improving the GIS response time. The exploration on magnetic shield design shows the discrepancy of shielding performance occurs in the case of the paralleling external magnetic field to the sample cylinder. These R&D works prove the design feasibility in some ways, and support possible solutions for design challenges as alternative design options.

Researching on Fatigue Model of Asphalt Mixtures

Firstly different fatigue testing methods of HMA were summarized, the scope of applicability of two kinds of control mode were analyzed,it is recommended that indirect tensile fatigue test with stress control mode to be used.Then effect of different testing factors were analyzed, the scope of the loading wave,stress ratio,frequency and temperature were selected.Three kinds of HMA specimens were compacted by gyratory compactor. Indirect tensile fatigue tests were carried by uniform test design method under different temperatures, frequencies and loadings, including three void ratios of asphalt mixes. Significance of the testing results was analyzed.The fatigue models were brought forward through multiple linear regression methods based on VFA, temperature, frequency, initial strain and initial modulus for general and heavy-duty loading. Comparative study of the fatigue models was made at home and abroad, it is shown that the fatigue models are comparable.They could be used for the fatigue prediction of asphalt mixtures. In order to study the mechanism of fatigue cracking and reduce the fatigue failure of the pavement, researchers of dif- ferent countries used different methods and proposed differ- ent fatigue models of asphalt mixtures . But these models were obtained by different experimental methods, different experimental conditions and different parameters, each of them has its specific application scope. In order to understand and master the fatigue law of as- phalt mixtures, three kinds of asphalt mixtures including AO 25I,AO20I and AK-16A were used,and fatigue testing was conducted under different conditions, then the fatigue model of asphalt mixtures was obtained.

The Paralleling of High Power High Frequency Amplifier Based on Synchronous and Asynchronous Control

The vertical position of plasma in the HT-7U Tokamak is inherently unstable. In order to realize active stabilization, the response rate of the high-power high-frequency amplifier feeding the active control coils must be fast enough. This paper analyzes the paralleling scheme of the power amplifier through two kinds of control mode. One is the synchronous control; the other is the asynchronous control. Via the comparison of the two kinds of control mode, both of their characteristics are given in the text. At last, the analyzed result is verified by a small power experiment.

Fatigue crack propagation in the elastic‐plastic regime in a low alloy structural steel†

Fatigue crack propagation tests under a high stress intensity range have been carried out on a low alloy structural steel BS 4360 Grade 50B. Crack growth rates ranging from about 10‐5 mm/cycle to over 0.1 mm/cycle have been recorded. Fatigue tests took on three kinds of control modes to achieve vastly different loading histories. Two specimen geometries which have markedly different yielding constraints and slip line field patterns have been employed. These tests aim at examining the ability of various fracture mechanics parameters to give a unifying quantitative correlation of fatigue crack growth rate from predominantly elastic to elastic‐plastic regimes. An effective cyclic‐J integral with crack closure being taken into account has been shown to be able to rationalize quantitatively the growth data under the different conditions investigated.