Main Control System Research Articles

Control Strategy of Wind Turbine Power Limitation under High Winds

This paper analyses the control strategy of different wind turbine power limitation in high winds. And the active power regulation method is summarized into: Start-Stop control, yaw control and pitch control. There are also some analysis and comparison of these three methods. It is pointed out that if the wind farm's main control system of wind turbine cant be modified, Start-Stop control strategy can be used for limiting the power via remote monitoring. Accordingly, this article provides a feasible start-stop control strategy. For the wind turbine whose main control system can be modified, this article gives feasibility analysis of yaw control and pitch control application. And only pitch control solution is suitable for limiting the active power. Accordingly, pitch control strategy is given in detail.

A New Algorithm for Real-Time Multiple Open-Circuit Fault Diagnosis in Voltage-Fed PWM Motor Drives by the Reference Current Errors

Three-phase inverters are currently utilized in an enormous variety of industrial applications, including variable-speed ac drives. However, due to their complexity and exposure to several stresses, they are prone to suffer critical failures. Accordingly, this paper presents a novel diagnostic algorithm that allows the real-time detection and localization of multiple power switch open-circuit faults in inverter-fed ac motor drives. The proposed method is quite simple and just requires the measured motor phase currents and their corresponding reference signals, already available from the main control system, therefore avoiding the use of additional sensors and hardware. Several experimental results using a vector-controlled permanent-magnet synchronous motor drive are presented, showing the diagnostic algorithm effectiveness, its relatively fast detection time, and its robustness against false alarms.

Simulation of Main Steam Temperature Control System Based on Fuzzy PID and Improved Smith Predictor

The main steam temperature process has the characteristics of large inertia, large time delay and time-variation , to solve this problem, the fuzzy PID cascade control system with Smith predictor is presented .The improved Smith predictor with the effect of filtering was used in the main loop of the cascade control system, and fuzzy PID compound controller was used as the main controller based on the advantage of fuzzy control and PID. Through establishing the mathematical model and simulating the main steam temperature control system, either the parameter changed or invariable, the results show that the method can improve the control qualities and enhance the robustness and stability of the control system.

Characterizing Limit Cycles in the Cassini Thrust Vector Control System

The Cassini spacecraft dynamics telemetry during long main engine burns has indicated the presence of stable limit cycles between 0.03 and 0.05 Hz frequencies. Even though these limit cycles have been observed in telemetry, they have not hindered the spacecraft performance to any degree of concern. The performance of the main engine thrust vector control system has been excellent throughout the prime and extended missions. However, it is important to understand these stable limit cycles from a controller design viewpoint. It is proposed that the observed limit cycles in the dynamics telemetry appear from a stable interaction between the unmodeled nonlinear elements and the linear main engine thrust vector control system. This paper focuses on one such nonlinearity that emerges from the gear backlash in the engine gimbal actuator system. The gear backlash nonlinearity is modeled via a describing function, and the interaction between the nonlinear element model and the overall dynamics of the spacecraft is studied. With this interaction, the stable limit cycle is reproduced analytically and in simulation. The results are compared with the actual telemetry from long burns like Saturn orbit insertion and main engine orbit trim maneuvers. The predicted stable limit cycle frequency and amplitude show good agreement within 6% error between the analytical, simulation, and telemetry results. This work claims that the stable limit cycles occur due to the stable interaction between the unmodeled nonlinear elements and linear main engine thrust vector control system.

The Design of Comprehensive Performance Test-Bed of Automobile Electric Power Steering System

A kind of comprehensive performance test-bed of automobile electric power steering system was designed. IPC was applied to the main control system. Testing software was developed based on Visual Basic. AC servo system was assembled to respectively simulate input torque and load torque, the manual input torque can also be realized by operating steering wheel. The motion control card MPC08 is used to control the motion of Servo motor. Test data is collected by using multi-function data collection card. The lifting gears were assembled to install input/output shaft servo motor and EPS. Test results show that the test-bed can verify the control strategies and accurately detect the assist characteristic of EPS.

발전소 통합감시제어시스템의 MBC 개발 로직 실계통 적용

Because the existing control system has been operating for about 20 years, it is necessary to upgrade the system for stable and efficient operation. But, there is a difficulty in maintenance by difference of manufacturer of each main control systems for boiler, turbine and generator. This developed IMCS(Integrated Monitoring and Control System) consists of more than 10,000 inputs and outputs for large scale thermal power plant. This paper consists of the development journey of IMCS MBC(mill and burner control) ; core binary protection & monitoring logic including prevention circuit of boiler explosion & implosion. In this project, the IMCS for boiler, turbine and generator was developed on basis of one communications platform. In this paper, the whole journey of development of IMCS MBC is dealt with designing software and hardware, coding application software, and validating software and hardware.

OPTIMAL CHOICE WITHIN A FAULT TOLERANT FLIGHT CONTROL SYSTEM

Safety of aircraft during the flight is one of the most important problems that concerns of all aviation. Failures/faults main elements automatic control system and damages to the external contour of the aircraft by foreign objects always lead to a change the characteristics of the aircraft, direct and indirect economic costs and sometimes to injury or death of passengers and crew. Real-time active fault tolerant control system makes it possible to warn or prevent emergency situations and thus improve safety.

ISHN Ion Source Control System. First Steps Toward an EPICS Based ESS-Bilbao Accelerator Control System

ISHN (Ion Source Hydrogen Negative) consists of a Penning type ion source in operation at ESS-Bilbao facilities. From the control point of view, this source is representative of the first steps and decisions taken towards the general control architecture of the whole accelerator to be built. The ISHN main control system is based on a PXI architecture, under a real-time controller which is programmed using LabVIEW. This system, with additional elements, is connected to the general control system. The whole system is based on EPICS for the control network, and the modularization of the communication layers of the accelerator plays an important role in the proposed control architecture.

Automatic Landing Controller of Unmanned Aerial Vehicle

This paper presents the soft control strategies for automatic landing of Unmanned Aerial Vehicle and simulation the result of controller. The soft controller parameters can be modify and show off the results response of control surface of Unmanned Aerial Vehicle which can fly to the desirable waypoints along the flight plan, one may freely select a control scheme to stabilize and perform the target tracking with robustness. The main control system of Unmanned Aerial Vehicle is developed from Fuzzy PD+I controller with auto-tuning gain parameters and the simulation is carried out by Matlab/Simulink simulation program including with Aerosim toolbox software. The model of Unmanned Aerial Vehicle for simulation in this paper is selected the model of Aerosonde UAV from Aerosonde PTY LTD., which is developed mathematical model by Unmanned Dynamics.

Control and data acquisition system for versatile experiment spherical torus at SNU

A control and data acquisition system for VEST (Versatile Experiment Spherical Torus) at Seoul National University (SNU) has been developed to enable remote operation from a central control room. The control and data acquisition system consists of three subsystems; a main control and data acquisition system that triggers each device at the preprogrammed timing and collects various diagnostic signals during discharges, a monitoring system that watches and logs the device status continuously, and a data storage and distribution system that stores collected data and provides data access layer via Ethernet. The system is designed to be cost-effective, extensible and easy to develop by using well-established standard technologies and solutions. Combining broad accessibility with modern information technology, alarm signal can be sent immediately to the registered cell phones when the abnormal status of devices is found, and the web data distribution system enables data access from almost everywhere using smart phones or tablet computers. Since December 2011, VEST is operational and the control and data acquisition system has been successfully used for remote operation of VEST.

Study on the CFBB Main Steam Pressure Control System Based on ADRC Technology

The combustion process of CFBB is a system with time-varying, nonlinear, large inertia and time delay. Therefore the control effects of traditional PID control system in the CFBB plant are not satisfactory , especially the overshoot of the main steam pressure control system is very big, and the adjustment time is too long. To improve the performance of the main steam pressure control system, ADRC technology was used . The disturbed signal was added in the different operating conditions, the testing results indicated that the ADRC main steam pressure control system had more excellent performance than the convention PID method.

Multipurpose electroslag remelting furnace for modern energy and heavy engineering industry

In 2011, a unique complex based on a multipurpose unit-type electroslag remelting (ESR) furnace is created to meet the demand for large high-quality solid and hollow billets for the products of power, atomic, petrochemical, and heavy machine engineering. This complex has modern low-frequency power supplies with a new control level that ensure a high homogeneity and quality of the billets and an increase in the engineering-and-economical performance of the production. A unique pilot ESR furnace is erected to adjust technological conditions and the main control system elements.

Management Systems and Accountability in “Ethical-Oriented Entities”

In some entities, in order to assure a systematic government coherent with values and guidelines, the traditional and main economic control systems is integrated with ethical-social, environmental and quality management systems. This process of integration guarantees the definition and the analysis of the global (economic, social, environmental) performances both inside the organization than outside when specific accountability instruments are used.The present work aims to deepen the relationship between the management instruments for quality, environment and ethical-social aspects, and the correspondents “accountability systems”.In consequence of a comparative analysis on the requirements of such instruments/systems an hypothesis is carried out for an intermediate operative framework - or “informative system” - that concurs to transfer, through the continuous improvement cycle (PDCA), main information for a correct and sustainable management of the organizations.With reference to the instruments, the analysis focuses on the relationship between accountability and the requirements for quality (ISO 9001), environmental (ISO 14001) and ethical-social (SA8000) management systems.An analysis has been conducted on a sample of all Italian companies with certified environmental and social management systems (defined as “ethical-oriented entities”). It showed that not only big entities use accountability instruments and that the number of reporting instruments is higher for “ethical-oriented organisations”.The obtained results represent the first step of a research aimed to define (i) how deep is the relation between reporting instruments and management systems and (ii) if the degree of reliability of reporting instruments is higher as a consequence of the presence of ethical-oriented management systems.

PID Control of Main Steam Temperature Used Quantum Particle Swarm Optimization

The main steam temperature is always an important indicator of the boiler operation quality, high or low will affect the quality of boiler operation. At first, introduce a algorithm PSO, which can used to optimize the PID parameters of a main steam temperature control system. Then, improved the PSO, and studied a kind of improved particle swarm algorithm—quantum apply quantum-behaved particle swarm optimization (QPSO). And this algorithm is used to optimize the PID parameters of a main steam temperature control system, got the best parameters. In the end, simulation result shows that, compared with basic particle swarm optimization (PSO),QPSO can make main steam temperature control system has a better control of quality, and improves the system of static and dynamic characteristics.

A Study on Humanoid Robot Control Method Using Zigbee Wireless Servo Motor with Sensor Network

In this study, we developed two legged multi-joint robot by using wireless servo motor that was applied by wireless sensor network technology, which is widely used recently, and performed an experiment of walking method of two legged multi-joint robot. We constructed the star network with servo motors which were used at each joint of two-legged robot. And we designed the robot for operation by transmission of joint control signal from main control system or by transmission of the status of each joint to the main control system, so it operates with continuously checking the status of joints at same time. We developed the humanoid robot by using wireless digital servo motor which is different from existing servo motor control system, and controlled it by transmitting the information of angles and speeds of robot joints to the motor(node) as a feedback through main control system after connecting power and setting up the IDs to each joint. We solved noisy problem generated from wire and wire length to connection point of the control device by construction of the wireless network instead of using existing control method of wiring, and also solved problem of poor real time response to gait motion by controlling the position with continuous transmission of control signals to each joint. And we found that the effective control of robot is able by performing the simulation on walking motion in advance with the developed control algorithm which was downloaded into installed memory. Also we performed the stable walking with two-legged robot by attaching pressure sensor to robot sole. And we examined the robot gait operated by application of calculated algorithm on robot movement to each joint. In this study, we studied the method of controlling robot gait motion by using wireless servo motors and measured the torque applied to each joint, and found that the developed wireless servo motor by ZigBee sensor network offers easier control of two legged robot gait and better circuit configuration of it than the existing wired control system could do.

MAN-B&W 10L90MC Main Engine a Starting Trouble of Remote Control System Analysis

Main engine remote control system of modern ship with unattended engine room is vital for the navigational safety , through a starting trouble of the AUTOCHIEF-IV remote control system, analyzes the air starting process of the system from the “Local”“Bridge”“Engine Control Room”position ， identify the trouble reason and solve the fault, put forward the daily work of the special note, provide for work personnel to valuable reference.

Visual Intelligent Vehicle Control System’s Design Based on PC9S12XS128 MCU

In this paper, PC9S12XS128 MCU produced by Freescale Semiconductor Co., Ltd is used as the core control unit to designed a intelligent vehicle, which can be free to follow the line of travel. The main control system including motor drive module, server drive module, the path identification module, power module, etc..Through compare a variety of hardware control program, use the best program to take control of car model’s speed and direction. Experimental results show that the intelligent vehicle designed can antomatic driving on the path of human plan accuracy.

Design of SPI Bus Communication in the Multi-Channel Data Acquisition Systems

the system structure of a multi-channel data acquirement system is introduced in this paper. The communication interaction circuit between the main control system and signal conditioning circuit is described. The SPI bus communication type is adopted between C8051F320 and FPGA. The speed and accuracy of datum transfer must be considered in the communication design, so the CRC calibration is used.

The Design of Embedded Multi-Channel Data Acquisition System

This paper analyzes the Flash Memory interface, SDRAM interface, Ethernet interface and Serial-port expansion circuit. The Embedded Multi-channel Data Acquisition System is designed by MCF5272 microprocessor. The main control system of MCF5272 includes SDRAM, Flash and BDM interface and so on. At the software design, we main introduce the compile and develop of bootload and the compiler and debugging environment of μClinux build. On this base, the general methods and points of the embedded system hardware design were summarized.

헬리콥터 주로터 조종 시스템 회전형 스와시플레이트 피로 안전수명 평가

주로터 조종 시스템은 헬리콥터의 추력 및 조종력을 담당하는 헬리콥터의 핵심 구성품이다. 주로 터 조종 시스템은 스와시플레이트 조립체, 시져 조립체, 피치로드 조립체, 가이드 등으로 구성되어 있으며 추력 및 조종력 등 다양한 하중에 견디고 최적화된 피로 안전 수명을 만족시켜야 한다. 이 시스템 구성품 중 회전형 스와시플레이트는 피치로드 하중과 회전형 시져 하중에 지배적인 영향을 받는 핵심구성품이다. 본 논문에서는 주로터 조종 시스템의 회전형 스와시플레이트 구성품에 대하여 피로 시험과 FEM 결과 비교를 통해 결과의 정확성을 입증하고, 이를 기반으로 수명을 평가하여 피로 안전수명을 도출하였다.