LADRC Control for the Three-Phase Voltage-Type PWM Rectifier

2012 ◽  
Vol 591-593 ◽  
pp. 1531-1534 ◽  
Author(s):  
Jin Fang Zhang ◽  
En Li Yao ◽  
Jin Chao Xing
Keyword(s):  
Control Method ◽  
External Disturbance ◽  
Processing System ◽  
Normal Operation ◽  
Equivalent Resistance ◽  
Phase Voltage ◽  
Pwm Inverter ◽  
Three Phase ◽  
Dc Bus ◽  
Bus Voltage

In the three-phase voltage-type pulse width modulation (PWM) inverter system, the steady DC-bus voltage is significant for normal operation of PWM converter. With traditional control method, DC-bus voltage has poor anti-disturbance performance and large steady-state error generated by parametric uncertainties of inductive resistance and switching devices’ equivalent resistance. To cope with these problems, a linear active disturbance rejection control (LADRC) controller is designed based on the advantages of the LADRC in processing system internal perturbation and external disturbance. The simulation study shows that under the same disturbance the proposed method can realize not only faster dynamic response and better property of anti-disturbance performance, but also unity power factor control. For the uncertainties of AC equivalent resistance and inductance, the method shows strong adaptability and robustness.

A Novel Control Strategy of PWM Rectifier

2013 ◽  
Vol 380-384 ◽  
pp. 290-293
Author(s):  
Wei Wang ◽  
Xin Chun Shi
Keyword(s):  
Dynamic Response ◽  
Reference Frame ◽  
Control Strategy ◽  
Control Method ◽  
Voltage Source ◽  
Pwm Rectifier ◽  
Phase Voltage ◽  
Three Phase ◽  
Dc Bus ◽  
Bus Voltage

Based on the mathematical model analysis of the three-phase voltage source PWM rectifier under abc reference frame and dq reference frame in this paper, a kind of three-phase voltage source PWM rectifier feed-forward decoupling control strategy is proposed. Dynamic response of DC bus voltage for PWM rectifier is very important, because higher response means little DC bus capacitor. An adaptive PI controller for the DC bus voltage was designed in this paper in order to improve the dynamic response. The experimental results indicate that this control method has good steady-state performance and fast dynamic response. For the reason of its simple, this control method has certain practical value.

scholarly journals A Fast and Robust DC-Bus Voltage Control Method for Single-Phase Voltage-Source DC/AC Converters

2019 ◽  
Vol 34 (9) ◽  
pp. 9202-9212 ◽  
Author(s):  
Seyedfoad Taghizadeh ◽  
Masoud Karimi-Ghartemani ◽  
M. Jahangir Hossain ◽  
Junwei Lu
Keyword(s):  
Single Phase ◽  
Control Method ◽  
Voltage Control ◽  
Voltage Source ◽  
Phase Voltage ◽  
Dc Bus ◽  
Bus Voltage ◽  
Ac Converters

Switched Control of Three-Phase Voltage Source Pulsewidth-Modulated Rectifier Under Dynamic Load: Output Feedback and Robustness

2016 ◽  
Vol 138 (12) ◽  
Author(s):  
Zhaowu Ping ◽  
Hao Tang ◽  
Jun-Guo Lu ◽  
Xueying Gao ◽  
Qi Tan
Keyword(s):  
Feedback Control ◽  
Dynamic Load ◽  
Output Feedback ◽  
Load Resistance ◽  
Voltage Source ◽  
Phase Voltage ◽  
Three Phase ◽  
Switched Control ◽  
Dc Bus ◽  
Bus Voltage

Three-phase voltage source pulsewidth-modulated (PWM) rectifiers (VSRs) have received great attentions in industrial applications. Recently, some attempt has been made to study the flexible direct current (DC)-bus voltage regulation problem under dynamic load of three-phase VSRs by switched control. Several proportional-integral (PI) controllers are designed for different load resistance range while only one PI controller is implemented for a given time instant by regarding the load resistance as the switching law. However, the existing approach is based on state feedback control, which requires the measurement of source current and DC-bus voltage. In this paper, we will adopt an output feedback control scheme, i.e., only DC-bus voltage should be measured. Compared with the existing result, our design requires less information and reduces the cost. Moreover, the robustness analysis of plant parameters is given when all the states are available. Simulation results demonstrate the effectiveness of our design.

scholarly journals DC-bus voltage controllers for a three-phase voltage-source inverter for distributed generation

2009 ◽  
Vol 1 (07) ◽  
pp. 297-302 ◽  
Author(s):  
Bart Meersman ◽  
Bert Renders ◽  
Lieven Degroote ◽  
Tine Vandoorn ◽  
Lieven Vandevelde
Keyword(s):  
Distributed Generation ◽  
Voltage Source ◽  
Phase Voltage ◽  
Voltage Source Inverter ◽  
Three Phase ◽  
Dc Bus ◽  
Bus Voltage

scholarly journals Control Strategy of Intergrated Photovoltaic-UPQC System for DC-Bus Voltage Stability and Voltage Sags Compensation

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 4009
Author(s):  
Dongsheng Yang ◽  
Zhanchao Ma ◽  
Xiaoting Gao ◽  
Zhuang Ma ◽  
Enchang Cui
Keyword(s):  
Power Quality ◽  
Control Strategy ◽  
Control Method ◽  
Integrated System ◽  
Normal Operation ◽  
Photovoltaic Array ◽  
Point Tracking ◽  
Dc Bus ◽  
Bus Voltage ◽  
Power Point

Power quality problem, because of its various forms and occurrence frequency, has become one of the most critical challenges confronted by a power system. Meanwhile, the development of renewable energy has led to more demands for an integrated system that combines both merits of sustainable energy generation and power quality improvement. In this context, this paper discusses an integrated photovoltaic-unified power quality conditioner (PV-UPQC) and its control strategy. The system is composed of a series compensator, shunt compensator, dc-bus, and photovoltaic array, which conducts an integration of photovoltaic generation and power quality mitigation. The fuzzy adaptive PI controller and the improved Maximum Power Point Tracking (MPPT) technique are proposed to enhance the stability of dc-bus voltage, which is aimed at the power balance and steady operation of the whole system. Additionally, the coordinate control strategy is studied in order to ensure the normal operation and compensation performance of the system under severe voltage sag condition. In comparison to the existing PV-UPQC system, the proposed control method could improve the performance of dc-bus stability and the compensation ability. The dynamic behavior of the integrated system were verified by simulation in MATLAB and PLECS. Selected results are reported to show that the dc-bus voltage was stable and increased under severe situations, which validates the effectiveness of the proposed integrated PV-UPQC system and its control strategy.

scholarly journals A novel power inverter for switched reluctance motor drives

2005 ◽  
Vol 18 (3) ◽  
pp. 453-465 ◽  
Author(s):  
Zeljko Grbo ◽  
Slobodan Vukosavic ◽  
Emil Levi
Keyword(s):  
Switched Reluctance Motor ◽  
Voltage Source ◽  
Power Electronic ◽  
Switched Reluctance ◽  
Three Phase ◽  
Reluctance Motor ◽  
Converter Topology ◽  
Dc Bus ◽  
Bus Voltage ◽  
Power Electronic Converter

Although apparently simpler, the SRM drives are nowadays more expensive than their conventional AC drive counterparts. This is to a great extent caused by the lack of a standardised power electronic converter for SRM drives, which would be available on the market as a single module. A number of attempts were therefore made in recent times to develop novel power electronic converter structures for SRM drives, based on the utilization of a three-phase voltage source inverter (VSI), which is readily available as a single module. This paper follows this line of thought and presents a novel power electronic converter topology for SRM drives, which is entirely based on utilization of standard inverter legs. One of its most important feature is that both magnetizing and demagnetizing voltage may reach the DC-bus voltage level while being contemporarily applied during the conduction overlap in the SRM adjacent phases. At the same time, the voltage stress across the power switches equals the DC-bus voltage. The topology is functional in all operating regimes of the drive. Principle of operation is explained in detail for a three-phase SRM drive and experimental results obtained with a 6/4 switched reluctance motor, are included. Four inverter legs are required in this case. Some considerations, justifying the proposed converter topology from the point of view of the cost, are included.

Vibration suppression for large-scale flexible structures based on cable-driven parallel robots

2020 ◽  
pp. 107754632096194
Author(s):  
Haining Sun ◽  
Xiaoqiang Tang ◽  
Senhao Hou ◽  
Xiaoyu Wang
Keyword(s):  
Large Scale ◽  
Vibration Suppression ◽  
Control Method ◽  
External Disturbance ◽  
Flexible Structures ◽  
Parallel Robot ◽  
Parallel Robots ◽  
Lyapunov Theory ◽  
Normal Operation ◽  
Control Methods

Specific satellites with ultralong wings play a crucial role in many fields. However, external disturbance and self-rotation could result in undesired vibrations of the flexible wings, which affect the normal operation of the satellites. In severe cases, the satellites would be damaged. Therefore, it is imperative to conduct vibration suppression for these flexible structures. Utilizing fuzzy-proportional integral derivative control and deep reinforcement learning (DRL), two active control methods are proposed in this article to rapidly suppress the vibration of flexible structures with quite small controllable force based on a cable-driven parallel robot. Inspired by the output law of DRL, a new control method named Tang and Sun control is innovatively presented based on the Lyapunov theory. To verify the effectiveness of these three control methods, three groups of simulations with different initial disturbances are implemented for each method. Besides, to enhance the contrast, a passive pretightening scheme is also tested. First, the dynamic model of the cable-driven parallel robot which comprises four cables and a flexible structure is established using the finite element method. Then, the dynamic behavior of the model under the controllable cable force is analyzed by the Newmark-ß method. Finally, these control methods are implemented by numerical simulations to evaluate their performance, and the results are satisfactory, which validates the controllers’ ability to suppress vibrations.

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