scholarly journals PWM Rectifier Fast Response Method for Electric Servo Loading System

2019 ◽  
Vol 37 (4) ◽  
pp. 794-801
Author(s):  
Qixun Zhou ◽  
Guichao Xu ◽  
Yufeng Zhang ◽  
Yong Zhou
Keyword(s):  
Flight Control ◽  
Output Voltage ◽  
Control Method ◽  
Feedforward Control ◽  
Dynamic Performance ◽  
Response Speed ◽  
Fast Response ◽  
Pwm Rectifier ◽  
Load Power ◽  
Loading System

The electric servo loading system can more fully test the stability and dynamic performance of the motor body and controller, and is widely used in the research and development of flight control systems. The traditional dual PWM converter has hysteresis characteristics. When the load power is abrupt, especially when the load power is suddenly reduced, the DC output voltage of the PWM rectifier will fluctuate. Voltage fluctuations can be suppressed by increasing the capacitance of the DC side capacitors, but an increase in the capacitance capacity causes the adjustment time of the system to become longer and slows down the response speed of the system. By analyzing the fluctuation of DC output voltage caused by sudden load change, a variable feedforward control method for iq load power is proposed, which uses the method of compensating the active current on the grid side to achieve instantaneous active power balance on both sides. The simulation results show that the method reduces the DC capacitor capacity and improves the dynamic response speed of the system.

Study on DPC-SVM Rectifier Based on Power Feedforward

2011 ◽  
Vol 383-390 ◽  
pp. 6942-6947
Author(s):  
Zhang Fei Zhao ◽  
Guo Jun Tan ◽  
Meng Liu ◽  
Guo Zhen Chen ◽  
Zheng Wang
Keyword(s):  
Control Method ◽  
Feedforward Control ◽  
Dynamic Performance ◽  
Response Speed ◽  
Mathematic Model ◽  
System Response ◽  
Pwm Rectifier ◽  
Vector Modulation ◽  
Control Principle ◽  
The Impact

In this paper, on the basis of the mathematic model of the three-level PWM rectifier, a power feedforward based control strategy is proposed combining with direct power control with space vector modulation (DPC-SVM) control principle. Feedforward control can reduce or even eliminate the impact on the system causing by load disturbance to improve dynamic performance. The simulation results show that the control method makes the system response speed faster and the dynamic performance better, it largely improved the system rectifier capacity against load disturbances.

scholarly journals Application of Repetitive Control and ANFIS-PI Compound Control Strategy in APF

2021 ◽  
Vol 2121 (1) ◽  
pp. 012037
Author(s):  
Mengtao Zhang ◽  
Tao Sui
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Balance Control ◽  
Dynamic Performance ◽  
Repetitive Control ◽  
Response Speed ◽  
Fast Response ◽  
Application Process ◽  
Actual Application ◽  
Compound Control

Abstract In order to effectively solve a series of problems caused by harmonics in power system, an active power filter based on ANFIS-PI and repetitive control is designed. The traditional single control method cannot balance control accuracy and response speed, so a compound control strategy is adopted. Repetitive control can produce the same output as the harmonic current, so it can achieve zero steady-state error tracking compensation for each harmonic, but its dynamic performance is not good. As a traditional control method, the PI control method has a fast response speed, but in the actual application process, when the load changes suddenly, that is, when the system parameters change, its tracking effect is not ideal. Therefore, a composite control strategy of ANFIS-PI and repeated control is proposed. It has been proved that its compensation accuracy and dynamic response speed have been significantly improved.

Research on Control Method of DC Voltage Based on Power Feedforward

2013 ◽  
Vol 380-384 ◽  
pp. 3065-3068
Author(s):  
Xin Du ◽  
Ling Zhu
Keyword(s):  
Control Method ◽  
Feedforward Control ◽  
Dynamic Performance ◽  
Response Speed ◽  
Active Power ◽  
System Response ◽  
Dc Voltage ◽  
Dc Bus ◽  
Bus Voltage ◽  
Grid Side

DC-bus voltage is affected by fluctuations of load and grid impact, threating the safe operation of the system. According to the instantaneous active power balance, a power feedforward control strategy was proposed to reduce the DC voltage fluctuations. In this strategy, the load active power was directly fed-forward to the grid-side given instantaneous active power node through a constructed load state feedforward channel, which avoided the slower process of indirect power adjustment through outer voltage loop. So, the system response speed was greatly accelerated, the DC-bus voltage fluctuation was inhibited effectively, and the dynamic performance of the system had improved. Test results demonstrate the effectiveness of the proposed strategy.

scholarly journals Improvement of the Response Speed for Switched Reluctance Generation System Based on Modified PT Control

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 2049 ◽  
Author(s):  
Xiaoshu Zan ◽  
Mingliang Cui ◽  
Dongsheng Yu ◽  
Ruidong Xu ◽  
Kai Ni
Keyword(s):  
Output Voltage ◽  
Pulse Width Modulation ◽  
Control Method ◽  
Low Frequency ◽  
Response Speed ◽  
Fast Response ◽  
Low Frequency Oscillation ◽  
Good Reliability ◽  
Switched Reluctance ◽  
Wide Range

The Switched Reluctance Generator (SRG) is suitable for wind power generation due to its good reliability and robustness. However, The SRG system adopting the conventional control algorithm with Pulse Width Modulation (PWM) method has a drawback, low response speed. The pulse train (PT) control has been widely used in dc/dc power converters operating in the discontinuous conduction mode due to its advantages of simple implementation and fast response. In this paper, for the first time, the PT control method is modified and adopted for controlling the output voltage of SRG system in order to achieve fast response. The capacitor current on the output side is sampled and combined with the output voltage to select the pulse trains and the low frequency oscillation cased by PT can be suppressed by tuning the feedback coefficient of the capacitor current. Also, good performance can be guaranteed with a wide range of voltage regulations, fast response, and no overshoot. The experimental platform of an 8/6 SRG system is built, and the experimental results show that the PT control can be used for SRG system with good practicability.

Study on Genetic Neural Network Control Strategy for DC/DC Converter

2011 ◽  
Vol 268-270 ◽  
pp. 1921-1927
Author(s):  
Xi Xiang Zhou ◽  
Jia Sheng Li ◽  
Dan Guo
Keyword(s):  
Neural Network ◽  
Output Voltage ◽  
Control Method ◽  
Response Speed ◽  
Weight Coefficient ◽  
Fast Response ◽  
Network Control ◽  
Initial Weight ◽  
Control Effect ◽  
Genetic Neural Network

A control method based on genetic neural network is presented to deal with the nonlinear object of the high-power PS-FB-ZVS PWM DC/DC converter. The control system optimizes the initial weight of the BP neural network and PID parameters tuning on line utilizing the genetic algorithm, which directly controls the object in closed-loop and has solved the problem that the controller network initial weight coefficient influences the control effect, thus, the optimal dynamic and steady state performance of the system is ensured. In the MATLAB environment, the control systems consisting of different controllers are simulated, and the output voltage and output current waveforms are obtained when the system is loaded by experiment. The results show that the controller has strong robustness, fast response speed, and small output voltage fluctuations with load changes.

Research on a Welding Power Supply Based on Double PWM Power Feedforward

2014 ◽  
Vol 1070-1072 ◽  
pp. 1874-1878
Author(s):  
Wei Liu ◽  
Ji Fang Zhang ◽  
Shi Wei Sun ◽  
Qing Chang Ji
Keyword(s):  
Power Supply ◽  
Control Method ◽  
Feedforward Control ◽  
Dynamic Performance ◽  
Control Voltage ◽  
Slow Dynamic ◽  
Current Harmonics ◽  
High Power Factor ◽  
Welding Power Supply ◽  
Transient Intermediate

The double PWM welding power supply which can inhibit network side current harmonics,in order to suppress the transient intermediate DC link voltage fluctuations in large, by increasing the DC capacitor capacity its weaknesses are: slow dynamic response, equipment of large volume,high cost, low life.This paper presented a welding power supply double PWM power based on feedforward control, voltage fluctuation suppression intermediate DC link power using feedforward strategy is feasible. Power system composed of this control method has the advantages of small size capacitor , high power factor, good dynamic performance,simple and feasible,and has application prospect.

The Nonlinear PID Control for Beam Magnetic Suspension System of Gantry-Moving Type Numerically Controlled Machine Tool

2012 ◽  
Vol 546-547 ◽  
pp. 992-996
Author(s):  
Chun Fang Liu ◽  
Bin Zang ◽  
Tong Wang
Keyword(s):  
Pid Control ◽  
Pid Controller ◽  
Control Method ◽  
Magnetic Levitation ◽  
Response Speed ◽  
Fast Response ◽  
Magnetic Suspension ◽  
Control Effect ◽  
Maglev System ◽  
Nonlinear Tracking

The maglev system is a typical nonlinear system, it is difficult to get the best control effect only by nonlinear control method. At first, the maglev system is linearized in this paper, for the classic PID control magnetic levitation system which exists the contradiction between fast and overshoot .This paper adopts the nonlinear tracking-differentiator-based PID controller to control the maglev system. Finally simulation results show that the nonlinear PID controller has fast response speed, no overshoot, and strong robustness in controlling the maglev system.

Design of Hi-Power Continuously Adjustable Constant Current Source Based on UC3846

2012 ◽  
Vol 430-432 ◽  
pp. 1519-1523 ◽  
Author(s):  
Yong Li ◽  
Cheng Rui Zhang ◽  
Ming Xing Lin ◽  
Yong Hua Li
Keyword(s):  
Power Supply ◽  
Control Method ◽  
Dynamic Performance ◽  
Current Source ◽  
Current Mode ◽  
Response Speed ◽  
Constant Current ◽  
Constant Current Source ◽  
Good Guide ◽  
Reduce Risk

This paper designs the switch adjustable constant current source based on the current mode PWM control chip UC3846, the power reach to 8kw, current 0~15A continuously adjustable. It uses the I2 control method to ensure the accuracy of the output current stability and improve the dynamic performance and response speed of the system. Feedback signals achieve in external circuit of the chip UC3846, they independent to each other to ensure the accuracy of the control signal. The model of UC3846 and the power supply were built by using Matlab Simulink separately. After building those models, the circuit was simulated by using Simulink, and its simulation results reflected the output of power supply truthfully which played a good guide for the circuit design and experiment, to avoid detours and reduce risk.

Research on Bidirectional DC/DC Converter for Electric Vehicle

2014 ◽  
Vol 701-702 ◽  
pp. 1169-1172 ◽  
Author(s):  
Shuang Du ◽  
Rui Juan Guo ◽  
Li Chen Wang
Keyword(s):  
Electric Vehicle ◽  
Closed Loop ◽  
Control Method ◽  
Storage System ◽  
Response Speed ◽  
Energy Storage System ◽  
Fast Response ◽  
Control Mode ◽  
Working Principle ◽  
Ultra Capacitor

The voltages of between the battery and the ultra-capacitor are not equal in the energy storage system of the electric vehicle. DC/DC converter is researched in order to balance the voltages between the battery and the ultra-capacitor. The traditional control method is not ideal. The model of bidirectional DC/DC converter is established on the basis of the working principle of the DC/DC converter. And it is in the double closed loop PI control mode. The results of simulation indicate that the control method has fast response speed, small overshoot and strong ability of anti-interference. It can also balance the energy between the battery and the ultra-capacitor.

scholarly journals Evasion-Faced Fast Adaptive Neural Attitude Control for Generic Hypersonic Vehicles with Structural and Parametric Uncertainties

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Tian Yan ◽  
Yuanli Cai ◽  
Caisheng Wei
Keyword(s):  
Flight Control ◽  
Attitude Control ◽  
Control Method ◽  
Response Speed ◽  
Hypersonic Vehicles ◽  
Parametric Uncertainties ◽  
Rapid Variation ◽  
Feed Forward ◽  
Nonlinear Functional ◽  
Attitude Maneuver

In general, the evasion task requires the hypersonic vehicles (HSVs) to quickly complete the attitude maneuver in a short time. Moreover, the rapid variation of the flight modes often induces the structural and parametric uncertainties as well as the highly dynamic disturbances of the HSVs. The peculiar and complex characteristics of the evasion process make it difficult to design the evasion-faced flight control systems. In this work, we investigate the fast adaptive control design problem for the generic HSVs under the evasion task. By introducing several especial nonlinear functional vectors and properly designing the adaptive laws, the high dynamic disturbances and uncertainties can be suppressed. To deal with the completed unknown parts of the structural uncertainties and aerodynamic uncertainties caused by evasion maneuver, two radial basis function neural networks (RBFNNs) are introduced as real-time approximators. Furthermore, to improve the response speed of the flight control system, a super-twisting (STW) algorithm-based predictor is used as a feed-forward term of the controller. Consequently, a novel evasion-faced fast adaptive feed-forward control structure has been established for the HSVs. It has been proven that all the signals of the closed-loop system are bounded with satisfactory tracking velocity. Finally, the simulation experiment has been set up to show the effectiveness and advantages of the proposed control method.

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