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 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.

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.

Study on the VF-DPC-SVM Strategy for Three-Level Rectifier

2011 ◽  
Vol 464 ◽  
pp. 61-64
Author(s):  
Guo Jun Tan ◽  
Zhang Fei Zhao ◽  
Zong Bin Ye ◽  
Yi Liu
Keyword(s):  
Control Strategy ◽  
Reactive Power ◽  
Dynamic Performance ◽  
Mathematic Model ◽  
Switching Frequency ◽  
Pwm Rectifier ◽  
Flux Linkage ◽  
Active And Reactive Power ◽  
Vector Modulation ◽  
Oriented System

In this paper, a constant switching frequency direct power control strategy based on the virtual line-flux-linkage oriented system for three-level PWM rectifier using space vector modulation (VF-DPC-SVM) is proposed, which is on the basis of the mathematic model of the PWM rectifier, the instantaneous reactive power and the vector control theory. Compared with the traditional control strategy, the proposed VF-DPC-SVM method guarantees a fixed switching frequency and realizes a better dynamic performance. The simulations and experiments indicate that the system has a better dynamic performance with lower harmonic current by use of the control strategy and can achieve the decoupling control of the active and reactive power.

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.

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.

Direct Slip Linear Control of Bearingless Induction Motor Based on Space Vector Modulation

2011 ◽  
Vol 317-319 ◽  
pp. 590-594
Author(s):  
Xian Xing Liu ◽  
Xiao Yan Shao ◽  
Ming Yi Chen
Keyword(s):  
Control System ◽  
Induction Motor ◽  
Control Method ◽  
Radial Force ◽  
Linear Control ◽  
Stable Operation ◽  
Space Vector Modulation ◽  
Space Vector ◽  
Vector Modulation ◽  
The Impact

Due to the complex nonlinear coupling characteristics of non-bearing induction motor control system, the basic requirements to maintain the stable operation of the bearingless induction motor is to achieve the decoupling control between electromagnetic torque and radial force, and it is also difficult to design efficient and reliable control system in this field. In this paper, the entire control system is divided into the rotating control system and suspension control system, a control method direct slip linear control based on space vector modulation (DSLC-SVM) is put forward. As to rotating part, because of the direct control of the slip, the flux magnitude deviation and the current total harmonic distortion (THD) can be reduced. As to suspension part, the voltage PWM controlled inverter is adopted to improve the utilization of DC bus voltage and reduce the impact of high harmonics. At last, by comparing the simulation results with traditional control methods, the feasibility and correctness of this method are demonstrated.

A Power Tracking Control Method for Single-Phase PWM Rectifier

2012 ◽  
Vol 516-517 ◽  
pp. 1893-1896
Author(s):  
Shi Jie Yan ◽  
Wen Zhong Gao ◽  
En Hui Chu
Keyword(s):  
Power Control ◽  
Power Factor ◽  
Tracking Control ◽  
Single Phase ◽  
Reactive Power ◽  
Control Method ◽  
Dynamic Performance ◽  
Pwm Rectifier ◽  
High Power Factor ◽  
Sinusoidal Current

Power control method had been widely used because of its simplicity, good dynamic performance, decoupled active and reactive power control for three-phase PWM rectifier. But it is not adapted to single-phase rectifier as power calculating problem. A power tracking control method is proposed for single-phase PWM rectifier. In new method, voltage and current with harmonics are decomposed of Fourier series. Their fundamental components are only extracted in order to calculate active power and reactive power and track requirement value. So the system not only realizes high power factor, sinusoidal current and stable DC link voltage, but also meet the application demand the capability of power regeneration to the power supply. The results of experiment show that the DC link voltage fluctuations should be minimal and the power factor is high. The proposed method is effective and practicable.

Active Control of Impact Vibration Using Feedforward Control Method

1989 ◽  
Vol 111 (1) ◽  
pp. 53-60 ◽  
Author(s):  
N. Tanaka ◽  
Y. Kikushima
Keyword(s):  
Control Method ◽  
Feedforward Control ◽  
Active Vibration Control ◽  
Analog Computer ◽  
Control Technique ◽  
Signal Wave ◽  
Control Effect ◽  
State Equations ◽  
The Impact ◽  
Impact Vibration

For the purpose of developing a vibrationless forge hammer, this paper presents a principle of the vibrationless forge method based upon an active vibration control technique. Then, from a viewpoint of feedforward control method, the vibrationless forge system is analyzed, and state equations of the system are derived. Next, with a view to simulating the vibrationless forge system using an analog computer, a signal wave of an impact force actually taken in a hammering test is employed as an input to the analog computer. Moreover, the control effect for suppressing the impact vibration is discussed. Finally, in order to obtain a perspective to realize the vibrationless forge hammer, an experiment is carried out, and the effectiveness of the vibrationless forge method is verified.

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.

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