Square of Voltage Out-Loop Based Feedback Linearization Control of Voltage Source Converter (VSC) in SMES

2013 ◽  
Vol 732-733 ◽  
pp. 1216-1221 ◽  
Author(s):  
Xiao Kang Dai ◽  
Bu Han Zhang ◽  
Yi Chen
Keyword(s):  
Feedback Linearization ◽  
Magnetic Energy ◽  
Control Variable ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Loop Control ◽  
Variable Expression ◽  
Feedback Linearization Control ◽  
Dc Bus ◽  
Bus Voltage

To improve the response characteristic of the VSC in SMES (Superconducting Magnetic Energy Storage) with wide load disturbance, a new square of voltage out-loop based feedback linearization control strategy is proposed for the control of VSC. The input variable was controlled by a combining of square of voltage out-loop based direct voltage control and current inner-loop control to achieve fast stabilization of DC bus voltage and accurate tracking of power of PCC. Stability and dynamic response characteristics of the system were verified by simulation results. It is shown that the proposed strategy can improve the DC bus voltage transient response with load step change, with simplified control variable expression and reduced calculating burden.

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.

scholarly journals Feedback Linearization and Sliding Mode Control for VIENNA Rectifier Based on Differential Geometry Theory

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Xiang Lu ◽  
Yunxiang Xie ◽  
Li Chen
Keyword(s):  
Differential Geometry ◽  
Sliding Mode Control ◽  
Control Strategy ◽  
Feedback Linearization ◽  
Sliding Mode ◽  
Current Loop ◽  
Loop Control ◽  
Mode Control ◽  
Vienna Rectifier ◽  
Feedback Linearization Control

Aiming at the nonlinear characteristics of VIENNA rectifier and using differential geometry theory, a dual closed-loop control strategy is proposed, that is, outer voltage loop using sliding mode control strategy and inner current loop using feedback linearization control strategy. On the basis of establishing the nonlinear mathematical model of VIENNA rectifier ind-qsynchronous rotating coordinate system, an affine nonlinear model of VIENNA rectifier is established. The theory of feedback linearization is utilized to linearize the inner current loop so as to realize thed-qaxis variable decoupling. The control law of outer voltage loop is deduced by utilizing sliding mode control and index reaching law. In order to verify the feasibility of the proposed control strategy, simulation model is built in simulation platform of Matlab/Simulink. Simulation results verify the validity of the proposed control strategy, and the controller has a strong robustness in the case of parameter variations or load disturbances.

DC Bus Instability Driving by Photovoltaic Source with Constant Power Load

2013 ◽  
Vol 313-314 ◽  
pp. 853-857 ◽  
Author(s):  
M.N.M. Nasir ◽  
Awang Jusoh ◽  
Alias Khamis
Keyword(s):  
Voltage Stability ◽  
Current Source ◽  
Voltage Source ◽  
Constant Power ◽  
Dc Voltage ◽  
Power Load ◽  
Dc Bus ◽  
Bus Voltage ◽  
Lc Filter ◽  
Constant Power Load

This study presented the DC bus instability in distributed power system driving by Photovoltaic (PV) source with constant power load (CPL). The aim of this study is to investigate the effect of PV source towards the performances of DC bus voltage stability using constant power load. The system first was tested using linear DC supply as voltage source and CPL was modeled and connected to the voltage source through LC filter network. A passive damping circuit was chosen to stabilize the DC bus instability. The system was repeated using PV source. PV array was modeled based on the parameters obtained from a commercial PV data sheet. A circuitry simulation was performed under the similar design excluding the DC source in order to investigate DC bus instability. Results showed that the stability of DC bus become unstable when using linear DC voltage supply and slightly affected when using PV source. The instability phenomenon due to the negative incremental impedance of a constant power load can be overcome by using damping technique. For linear DC voltage source, DC bus voltage system tends to oscillate. However, with PV source which is actually a current source input seems not much affecting the DC bus voltage stability.

scholarly journals Research on Operating Characteristics of Two-Terminal Flexible Direct Transmission with Improved Deadbeat Control

2021 ◽  
Vol 256 ◽  
pp. 01043
Author(s):  
Mei Jianchun ◽  
Qian Junxia ◽  
Zhao Shengjie ◽  
Ma Hongjuan ◽  
Song Pengcheng ◽  
...  
Keyword(s):  
Control Strategy ◽  
Operation Mode ◽  
Electricity Consumption ◽  
Transmission System ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Basic Operation ◽  
Deadbeat Control ◽  
Operating Characteristics ◽  
Loop Control

Traditional DC transmission technology has obvious defects in power adjustment speed, loss reduction, protection and control, etc., and it has been unable to meet the diverse needs of electricity consumption. The flexible DC transmission system not only solves the above shortcomings, but also has the advantages of independently controllable power and power supply to passive network. It is widely applied in distributed power generation by new energy, micro grid and other fields. This paper takes the two-terminal flexible DC transmission system as the research object, establishes the mathematical mode of two-terminal flexible DC transmission system, and studies the basic operation mode of the system and the voltage source converter (VSC) control strategy on this basis. Considering the problems of control delay and poor responsiveness of current closed-loop control when the traditional deadbeat control is applied to VSC converters, an improved deadbeat control strategy is proposed to solve the above-mentioned defects by predicting the current sampling at k+2 moment. Finally, the co-simulation is used to verify the correctness and reliability of the above-mentioned method.

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