Study of Hoist Control System Based on Dual Three-Level Inverter

2014 ◽  
Vol 577 ◽  
pp. 368-371
Author(s):  
Feng Wang ◽  
Shu Yun Qiao ◽  
Xu Long Zhang
Keyword(s):  
Control System ◽  
Power Factor ◽  
Control Method ◽  
Dynamic Performance ◽  
Power Saving ◽  
Power Converter ◽  
Unity Power Factor ◽  
Energy Flows ◽  
Stator Flux ◽  
Grid Side

The double-fed control strategy for AC hoist motor is discussed in this paper. The AC/DC/AC power converter is adopted as main circuit. Three-phase neutral-point-clamped three-level rectifier is used as AC/DC link to realize unity power factor at grid-side, which reduces harmonic distortions. For the DC/AC inverter, three-level topology is used, which is controlled by stator-flux oriented vector control method. Meanwhile, energy flows in bidirectional way by back to back three-level power converter. The hoist motor control system obtains a high dynamic performance when stator side operating in unity power factor condition. The reliability and safety of hoist system is improved based on double PLC. The control system mentioned in this paper is being used to control a shaft hoist with a capacity of 260kW, and the power saving is remarkable.

scholarly journals On the Relation between Mains-Side Current THD and DC Link Voltage Loop Gain in Grid-Connected Unity Power Factor Operating Converters

2021 ◽  
Author(s):  
Alon Kuperman
Keyword(s):  
Power Factor ◽  
Dynamic Performance ◽  
Harmonic Distortion ◽  
Loop Gain ◽  
Unity Power Factor ◽  
Trade Off ◽  
Loop Bandwidth ◽  
Grid Connected Converters ◽  
Grid Side ◽  
Double Grid

<p>It is well-known that attainable DC link voltage loop bandwidth in grid-connected converters operating with unity power factor is limited due to trade-off with AC-side current total harmonic distortion (THD). The letter reveals that THD requirement directly imposes the value of voltage loop gain magnitude at double-grid frequency; therefore the dynamic performance may be improved without deteriorating the grid-side current quality by modifying the controller structure such that the loop gain magnitude at double-grid frequency and the crossover frequency are decoupled. Experimental results validate the revealed findings.</p>

Research on Control Method of Hybrid Energy Storage System in Field of Distributed Generation

2014 ◽  
Vol 529 ◽  
pp. 519-523
Author(s):  
Zhong Ce Wang
Keyword(s):  
Control System ◽  
Energy Storage ◽  
Control Method ◽  
Dynamic Performance ◽  
Storage System ◽  
Power Converter ◽  
Open Loop ◽  
System Stability ◽  
Discharge Process ◽  
Super Capacitor

Super capacitor and batteries are designed based on the power converter. A control strategy of single zero-pole with variable gain is proposed in order to eliminate the affect of changes of super capacitor voltage on the system. It controls the discharge current of battery directly to let the current constant. Through the analysis the bode diagram of Open-loop system, stability and dynamic performance of the control system was demonstrate. Simulation result shows that the parallel control system can effectively optimize the battery discharge process and achieve complementary of the advantages two energy storage components.

scholarly journals On the Relation between Mains-Side Current THD and DC Link Voltage Loop Gain in Grid-Connected Unity Power Factor Operating Converters

2021 ◽  
Author(s):  
Alon Kuperman
Keyword(s):  
Power Factor ◽  
Dynamic Performance ◽  
Harmonic Distortion ◽  
Loop Gain ◽  
Unity Power Factor ◽  
Trade Off ◽  
Loop Bandwidth ◽  
Grid Connected Converters ◽  
Grid Side ◽  
Double Grid

<p>It is well-known that attainable DC link voltage loop bandwidth in grid-connected converters operating with unity power factor is limited due to trade-off with AC-side current total harmonic distortion (THD). The letter reveals that THD requirement directly imposes the value of voltage loop gain magnitude at double-grid frequency; therefore the dynamic performance may be improved without deteriorating the grid-side current quality by modifying the controller structure such that the loop gain magnitude at double-grid frequency and the crossover frequency are decoupled. Experimental results validate the revealed findings.</p>

Design Research of Unit Power Factor Power Converter

2014 ◽  
Vol 986-987 ◽  
pp. 1809-1812
Author(s):  
Wei Sun ◽  
Kui Hua Wu ◽  
Bo Yang ◽  
Rong Liang ◽  
Jian Wang ◽  
...  
Keyword(s):  
Power Factor ◽  
Design Research ◽  
Control Method ◽  
Power Converter ◽  
Current Control ◽  
Unity Power Factor ◽  
Unit Power ◽  
Harmonic Content ◽  
Direct Current Control ◽  
Power Factor Control

In view of the problems that traditional direct current control calculation is complex, that sensor precision requirements are high. This paper proposes a new control method of unit power factor power converter, which is easy to realize with simple control structure dispense with current sensor. Through the simulation and experimental verification, the control strategy can achieve unity power factor control, and the harmonic content is small and the operation is stable.

Development of a Ring Permeability Test System

2010 ◽  
Vol 136 ◽  
pp. 153-157
Author(s):  
Yu Hong Du ◽  
Xiu Ming Jiang ◽  
Xiu Ren Li
Keyword(s):  
Control System ◽  
Control Method ◽  
Dynamic Performance ◽  
Experimental Tests ◽  
Measuring Method ◽  
Test System ◽  
Fluid Theory ◽  
And Control ◽  
Relationship Of ◽  
The Mathematical Model

To solve the problem of detecting the permeability of the textile machinery, a dedicated test system has been developed based on the pressure difference measuring method. The established system has a number of advantages including simple, fast and accurate. The mathematical model of influencing factors for permeability is derived based on fluid theory, and the relationship of these parameters is achieved. Further investigations are directed towards the inherent characteristics of the control system. Based on the established model and measuring features, an information fusion based clustering control system is proposed to implement the measurement. Using this mechanical structure, a PID control system and a cluster control system have been developed. Simulation and experimental tests are carried out to examine the performance of the established system. It is noted that the clustering method has a high dynamic performance and control accuracy. This cluster fusion control method has been successfully utilized in powder metallurgy collar permeability testing.

Design and Implementation of 30kW Three-Phase PV Grid-Connected Inverter

2012 ◽  
Vol 241-244 ◽  
pp. 636-640
Author(s):  
Wu Wu Tang ◽  
Liang Liang Chen ◽  
Hong Xu Yin ◽  
Hao Dong
Keyword(s):  
Control Method ◽  
Dynamic Performance ◽  
Current Control ◽  
Unity Power Factor ◽  
Harmonic Content ◽  
Three Phase ◽  
Rotating Reference Frame ◽  
Grid Connected Inverter ◽  
Pv Grid ◽  
Factor State

This paper developed a mathematical model of three-phase PV grid-connected inverter, and studied the grid-connected current control method based on PI control in synchronous rotating reference frame. Simulation and experimental results from the prototype of 30kW three-phase PV grid-connected inverter proved the correctness and the feasibility of the control strategy, and this grid-connected inverter can operate at the unity power factor state with a nice dynamic performance, and the output current has high sinusoidal and low harmonic content as well as good symmetry.

Modeling and Control Simulation for the Multi-Range Hydro-Mechanical CVT

2014 ◽  
Vol 621 ◽  
pp. 462-469 ◽  
Author(s):  
Ming Zhu Zhang ◽  
Zhi Li Zhou
Keyword(s):  
Control System ◽  
Dynamic Characteristic ◽  
Control Method ◽  
Dynamic Performance ◽  
Range Shift ◽  
Transmission Ratio ◽  
Modeling And Control ◽  
Finite State ◽  
Displacement Pump ◽  
And Control

To develop the control system of multi-range hydro-mechanical continuously variable transmission (HMCVT), a model of a multi-range HMCVT is built using the principle of dynamics. According to the characteristic of power split, HMCVT is separated as axes set, variable displacement pump-motor system, clutch set. With wheel tractor as application instance, the whole model of vehicle power train is made, which includes the engine, HMCVT, running system and control system. Based on the theory of Finite State Machine, an automatic control method of speed change and range shift is present, which employs the throttle value, engine speed, range number and transmission ratio as the control parameters. The dynamic characteristic of automatic speed changing and ranges shifting is simulated. The result indicates that the model can correctly represent the dynamic characteristic of HMCVT, the engine can run at the optimal working point, the multi-range HMCVT can shift range steadily and change transmission ratio continuously when the load changes, the circularly shift range is avoided. The model can be used conveniently for the analysis of vehicle dynamic performance and the research of multi-range HMCVT control method.

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