scholarly journals Modeling and Control System Design of Marine Controlled-Source Electromagnetic Detection Transmitter

2015 ◽  
Vol 9 (1) ◽  
pp. 571-578
Author(s):  
Tao Haijun ◽  
Zhang Yiming ◽  
Ren Xiguo
Keyword(s):  
Electromagnetic Wave ◽  
Mineral Resources ◽  
Current Mode ◽  
Response Speed ◽  
Equivalent Model ◽  
Current Loop ◽  
Large Power ◽  
Loop Control ◽  
Modeling And Control ◽  
Controlled Source

Marine electromagnetic transmitter transmits large power variable frequency electromagnetic wave to the seabed so as to obtain the submarine structure and mineral resources. The mathematical model of controlled source circuit needs to be established to realize closed loop control for increasing control precision and output transient performance of the electromagnetic wave. The operation process of controlled circuit is analyzed in continuous current mode, two equivalent switching states of controlled source circuit are obtained through the analysis of the different states of the switch in a switching period. A small signal equivalent model of the system is established using small ripple approximation. For high output voltage fluctuation problem in single loop control, double loop control strategy of voltage loop and current loop is designed. The simulation and experimental results show that, the system has the advantages of fast transient response speed and good regulation performance.

Feed-Forward Slope Compensated PFC for Chaos Control

2015 ◽  
Vol 24 (05) ◽  
pp. 1550065 ◽  
Author(s):  
Ya-Ni Li ◽  
Yin-Tang Yang ◽  
Zhang-Ming Zhu ◽  
Chao-Lin Zhang
Keyword(s):  
Chaos Control ◽  
Current Mode ◽  
Response Speed ◽  
System Stability ◽  
Nonlinear Phenomena ◽  
Bifurcation And Chaos ◽  
Feed Forward ◽  
Loop Control ◽  
Circuit Structure ◽  
Slope Compensation

Based on the dual-loop control peak current mode power factor correction (PFC) converter, a feed-forward slope compensation method is proposed, which could regulate the compensated slope real-time and suppress the loop perturbation, thus controlling chaos of the system for better stability. A dual-loop Boost PFC model with the feed-forward slope compensation is built to analyze the nonlinear phenomena in system, and the corresponding circuit structure is presented. The chaos control ability of the feed-forward slope compensation is studied theoretically, and the relation of compensated slope and feed-forward signal is deduced, as well as slope stability conditions. The simulation and measured results show that this method could effectively suppress system bifurcation and chaos phenomena, and improve the system working range and dynamic response speed, and eliminate the influence on system stability for without compensated, under compensated, and over compensated.

Research on Double-Closed-Loop Control for the Frequency Converters in Parallel Operation

2013 ◽  
Vol 722 ◽  
pp. 503-506
Author(s):  
Hao Long ◽  
Xue Jun Li ◽  
Jing Long Huang ◽  
Kuan Fang He
Keyword(s):  
Closed Loop ◽  
Frequency Converter ◽  
Dynamic Performance ◽  
Response Speed ◽  
Current Loop ◽  
Parallel Operation ◽  
Loop Control ◽  
Frequency Converters ◽  
The Stability ◽  
Classical Control

In order to achieve the two drive synchronous operation , it's necessary to add an inner current loop on the basis of the outer voltage regulator which improve the system s dynamic response speed in the premise of ensure the stability of the system. The frequency converter parallel technology controlled by voltage and current double closed loop is researched. Design the controllers parameters of the current inner ring and voltage outer ring and these parameters are demonstrated according to the classical control theory. At last we conduct the simulation whose results show that the parallel converter system which controlled by the voltage and current double closed loop has good static and dynamic performance.

scholarly journals Small-Signal Modeling of Marine Electromagnetic Detection Transmitter Controlled-Source Circuit

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Haijun Tao ◽  
Yiming Zhang ◽  
Xiguo Ren
Keyword(s):  
Electromagnetic Waves ◽  
Frequency Conversion ◽  
Input Voltage ◽  
Current Transformer ◽  
Soft Switching ◽  
Small Signal ◽  
Large Power ◽  
Loop Control ◽  
Controlled Source ◽  
Low Efficiency

Marine electromagnetic transmitter transmits electromagnetic waves with large power frequency conversion to the seabed to obtain the submarine structure and mineral resources. However, the current transmitter presents several problems, such as low efficiency, serious heat, and poor adaptability to the load. Soft-switching controlled-source circuit is used to reduce circuit losses. The mathematical model of controlled-source circuit should be established to realize a closed-loop control for increasing the output transient performance of electromagnetic waves. Given that the soft-switching controlled-source circuit has more status and that direct modeling is difficult, small-signal model of soft-switching controlled-source circuit is established based on that of hard-switching controlled-source circuit by analyzing the effect of output filter inductor current transformer leakage inductance and input voltage soft-switching controlled circuit on change in the duty cycle. Finally, experiments verify the accuracy and validity of the model.

Performance Evaluation of Effective Multi-Structure Controllers for KY Negative Output Boost Converter

2021 ◽  
pp. 2250033
Author(s):  
P. Ramesh
Keyword(s):  
Output Voltage ◽  
Fuzzy Logic Controller ◽  
Supply Voltage ◽  
Current Mode ◽  
Boost Converter ◽  
Prototype Model ◽  
Current Loop ◽  
Loop Control ◽  
Field Programmable ◽  
Negative Output

This paper focuses on the design of multi-structure controllers (MSCs) for KY negative output boost converter (KYNOBC) functioned in continuous current mode (CCM) for low-power source applications. KYNOBC is one of the topologies of DC–DC converter that performs the positive DC input supply voltage into a negative output voltage. Dynamic behavior of KYNOBC is nonlinear in nature because of its time-changing operation. The single loop control does not regulate the multi-parameters of KYNOBC during the line and load variations owing to that it produces poor transient and dynamic analyses. With the aim of controlling the multi-parameters of KYNOBC such as inductor current and output voltage, enriching the transient and dynamic analysis, the MSCs are recommended in this paper. In our study, MSCs for KYNOBC consist of two loops such as inner proportional (P) controller inductor current loop for modulating the converter current and outer fuzzy logic controller (FLC)/proportional integral (PI) controller voltage loop for regulating the output voltage. The P and PI values are determined from the mathematical modeling of KYNOBC and the fuzzy rules are framed based on its performance without modeling equations. The behaviors of the KYNOBC with MSCs are validated at various zones by making the MATLAB/Simulink simulations and prototype model. The controller parameters are realized in prototype field programmable gate array (FPGA). The responses are recorded to indicate the dexterous of the MSCs for it.

Digital Current Loop for Permanent Magnet Linear Synchronous Motor Based on DSP and FPGA

2013 ◽  
Vol 416-417 ◽  
pp. 686-691
Author(s):  
Yong Zhang ◽  
Xin Min Zhang ◽  
Qin Fen Lu ◽  
Yi Chen ◽  
Yun Yue Ye
Keyword(s):  
Permanent Magnet ◽  
Gain Control ◽  
Response Speed ◽  
Synchronous Motor ◽  
Open Loop ◽  
Current Loop ◽  
Static Error ◽  
Loop Control ◽  
Linear Synchronous Motor ◽  
Positioning Method

In the high-precision servo control system of permanent magnet linear synchronous motor (PMLSM), the regulation of current loop has a direct effect on the control performances such as accuracy, response speed etc. In order to improve the control performances, a digital current loop control scheme based on DSP and FPGA is presented in this paper. FPGA is used to collect data, while DSP is for completing parallel collection of the input signals read and written from FPGA. P control, P uniting feed-forward compensation control and variable proportional gain control are investigated. Since the method of variable proportional gain can easily meet the requirement of current static error and quick response under different frequencies, PI control can basically eliminate the static error. With rotor initial positioning method, the current closed-loop control is proposed and compared with current open-loop control.

An Efficient Approach for Modeling and Control of a Quadrotor

2016 ◽  
Vol 4 (2) ◽  
pp. 1-16
Author(s):  
Ahmed S. Khusheef
Keyword(s):  
Pid Control ◽  
Control Method ◽  
Mechanical Design ◽  
Loop Control ◽  
Modeling And Control ◽  
Loop Control System ◽  
And Control ◽  
Close Loop Control ◽  
Close Loop Control System ◽  
Made In

 A quadrotor is a four-rotor aircraft capable of vertical take-off and landing, hovering, forward flight, and having great maneuverability. Its platform can be made in a small size make it convenient for indoor applications as well as for outdoor uses. In model there are four input forces that are essentially the thrust provided by each propeller attached to each motor with a fixed angle. The quadrotor is basically considered an unstable system because of the aerodynamic effects; consequently, a close-loop control system is required to achieve stability and autonomy. Such system must enable the quadrotor to reach the desired attitude as fast as possible without any steady state error. In this paper, an optimal controller is designed based on a Proportional Integral Derivative (PID) control method to obtain stability in flying the quadrotor. The dynamic model of this vehicle will be also explained by using Euler-Newton method. The mechanical design was performed along with the design of the controlling algorithm. Matlab Simulink was used to test and analyze the performance of the proposed control strategy. The experimental results on the quadrotor demonstrated the effectiveness of the methodology used.

scholarly journals Source modification for efficiency enhancement of marine controlled-source electromagnetic method

2021 ◽  
Vol 18 (2) ◽  
Author(s):  
Amir Rostami ◽  
Noorhana Yahaya ◽  
Hassan Soleimani ◽  
Muhammad Rauf ◽  
Tadiwa E Nyamasvisva ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Shallow Water ◽  
Method Of Moments ◽  
Experimental Setup ◽  
Efficiency Enhancement ◽  
Shooting Methods ◽  
Detection Capability ◽  
Controlled Source ◽  
Element Simulation ◽  
Electromagnetic Source

Abstract Controlled-source electromagnetics is a strongly efficient technique to explore deep-water marine hydrocarbon reservoirs. However, the shallow-water unsolved limitations of electromagnetic shooting methods still exist. In this regard, this work aims to alter the existing conventional electromagnetic source such that it can converge the down-going electromagnetic wave while simultaneously dispersing the up-going electromagnetic energy to minimise the airwave in shallow water. This work presents computed electric current distribution inside a modified transmitter, using a method of moments. Simulation and an experiment-based methodology are applied to this work. Finite element simulation of the response of the modified transmitter displayed the capability of the new transmitter in dispersing the airwave, by 15%. The experimental setup confirmed a better performance of the new transmitter, showing hydrocarbon delineation of up to 48%, compared to the existing conventional transmitter, with 25% oil delineation at the same depths in the same environment. Modification of the electromagnetic source to unbalance the up-down signals may have the potential to enhance the delineation magnitude of the target signal and, as a result, significantly improve oil detection capability.

Design and Implementation of Mid-Frequency Magnetron Sputtering Power Supply Based on TL494 and MCU

2013 ◽  
Vol 709 ◽  
pp. 408-412
Author(s):  
Yan Ling Zhao ◽  
Rong Xing Liu
Keyword(s):  
Magnetron Sputtering ◽  
Power Supply ◽  
Current Mode ◽  
Voltage Regulation ◽  
Control Circuit ◽  
Constant Current ◽  
Loop Control ◽  
Pulse Width Modulator ◽  
Digital Pulse ◽  
The Stability

Abstract. A mid-frequency magnetron sputtering (MFMS) power supply based on TL494 and MCU was introduced. A Buck Chopper and full bridge inverter were applied to the main circuit. The PWM controller TL494 was used in the Buck voltage-regulation control circuit to realize closed loop control. The drive signal of the IGBT in full bridge inverter was based on precise digital pulse width modulator (DPWM) signal produced by the MCU M30290. The DPWM can be set by potentiometer so the power supply can output the square wave with adjustable frequency and duty cycle. The power supply was operated in constant current mode. For micro or strong arcing of the target, different safeguards were adopted by the control circuit. At last, the system test and experimental results show that the stability, reliability and tuning range of the MFMS power supply can meet the requirements of the magnetron sputtering coating.

The Improved Design of Test Machine Linear-Velocity Closed-Loop Control Circuit

2013 ◽  
Vol 365-366 ◽  
pp. 874-877
Author(s):  
Chang Hai Li ◽  
Yuan Tao Yu ◽  
Shi Yang Ma ◽  
Yan Chun Liu
Keyword(s):  
Pid Control ◽  
Control Algorithm ◽  
Response Speed ◽  
Test Machine ◽  
Static Error ◽  
Loop Control ◽  
Improved Design ◽  
Value Changes ◽  
The Given ◽  
Control Accuracy

Incremental PID has its shortcomings: great integral truncation effect, static error and spillover affect. In the control system, the controller system is required having a quick response speed, and also a certain anti-interference ability. When adopting the improved differential PID control algorithm, only the output differential is made, instead of the given values. So, when a given value changes, the output will not change, and the controlled quantity change is usually mild, in which case the control accuracy is improved, and the system dynamic characteristics is greatly improved.

Complex Resistivity Method and its Application in Mineral Resource Exploration

2011 ◽  
Vol 396-398 ◽  
pp. 115-118
Author(s):  
Xin Gong Tang ◽  
Xing Bing Xie ◽  
Liang Jun Yan
Keyword(s):  
Oil And Gas ◽  
Supply And Demand ◽  
Mineral Resources ◽  
Underground Water ◽  
Electromagnetic Method ◽  
Complex Resistivity ◽  
West China ◽  
Controlled Source ◽  
Resistivity Method ◽  
Resource Exploration

Complex resistivity (CR) is one of an electromagnetic method which plays an important role in the exploration of oil and gas, underground water as well as solid mineral resources in recent years. Nowadays China is under fast developing and there is still a big gap between the supply and demand of mineral resources. As an effective controlled source electromagnetic method, CR method can be easily used to judge the content of resources, determine the target reservoir and select a favorable drilling area. In this paper, an introduction to CR method and its application in copper mine exploration in west China is present. The result shows that CR is an effective electromagnetic method in the exploration of deep mineral resources.

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