Accuracy Control Method of Long Distance Tunnel Plane Control Network

2021 ◽  
Keyword(s):  
Control Method ◽  
Control Network ◽  
Accuracy Control ◽  
Long Distance

A Voltage Control Method of Static Var Compensator for the Remote System Interconnected by Long Distance AC Cables

2011 ◽  
Vol 131 (11) ◽  
pp. 896-904
Author(s):  
Yuji Tamura ◽  
Shinji Takasaki ◽  
Yasuyuki Miyazaki ◽  
Hideo Takeda ◽  
Shoichi Irokawa ◽  
...  
Keyword(s):  
Control Method ◽  
Voltage Control ◽  
Static Var Compensator ◽  
Long Distance ◽  
Remote System

scholarly journals A Novel Adaptive Control Approach Based on Available Headroom of the VSC-HVDC for Enhancement of the AC Voltage Stability

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3222
Author(s):  
Duc Nguyen Huu
Keyword(s):  
Adaptive Control ◽  
Voltage Stability ◽  
Reactive Power ◽  
Control Method ◽  
Offshore Wind ◽  
Voltage Source ◽  
Long Distance ◽  
Control Approach ◽  
Hvdc System ◽  
Voltage Support

Increasing offshore wind farms are rapidly installed and planned. However, this will pose a bottle neck challenge for long-distance transmission as well as inherent variation of their generating power outputs to the existing AC grid. VSC-HVDC links could be an effective and flexible method for this issue. With the growing use of voltage source converter high-voltage direct current (VSC-HVDC) technology, the hybrid VSC-HVDC and AC system will be a next-generation transmission network. This paper analyzes the contribution of the multi VSC-HVDC system on the AC voltage stability of the hybrid system. A key contribution of this research is proposing a novel adaptive control approach of the VSC-HVDC as a so-called dynamic reactive power booster to enhance the voltage stability of the AC system. The core idea is that the novel control system is automatically providing a reactive current based on dynamic frequency of the AC system to maximal AC voltage support. Based on the analysis, an adaptive control method applied to the multi VSC-HVDC system is proposed to realize maximum capacity of VSC for reactive power according to the change of the system frequency during severe faults of the AC grid. A representative hybrid AC-DC network based on Germany is developed. Detailed modeling of the hybrid AC-DC network and its proposed control is derived in PSCAD software. PSCAD simulation results and analysis verify the effective performance of this novel adaptive control of VSC-HVDC for voltage support. Thanks to this control scheme, the hybrid AC-DC network can avoid circumstances that lead to voltage instability.

Truncated Fourier series formulation for bipedal walking balance control

Robotica ◽  
2009 ◽  
Vol 28 (1) ◽  
pp. 81-96 ◽  
Author(s):  
Lin Yang ◽  
Chee-Meng Chew ◽  
Yu Zheng ◽  
Aun-Neow Poo
Keyword(s):  
Fourier Series ◽  
Control Method ◽  
Balance Control ◽  
Bipedal Walking ◽  
Reference Trajectory ◽  
Dynamic Feedback ◽  
Long Distance ◽  
Time Dynamic ◽  
Truncated Fourier Series ◽  
Walking Balance

SUMMARYThis paper studies the parameters contained in the truncated Fourier series (TFS) formulation for bipedal walking balance control. Using the TFS generated lateral motion reference, 3D bipedal walking can be directly achieved without any parameter adjustment. Furthermore, the potential of this TFS formulation for motion balance control has also been investigated. One more motion balance strategy is developed through the reinforcement learning, which adjusts the motion's reference trajectory according to the selected dynamic feedback in real time. Dynamic simulation results of the presented balance control method show that the resulting motion can be constrained periodical and long-distance 3D bipedal walking motions are achievable.

Dynamics of a Large Scale Hydraulic Capsule Pipeline System

1999 ◽  
Vol 124 (1) ◽  
pp. 191-195 ◽  
Author(s):  
Hongliu Du ◽  
Satish S. Nair
Keyword(s):  
Large Scale ◽  
Control Method ◽  
Experimental Studies ◽  
Small Scale ◽  
Pipeline System ◽  
Centrifugal Pumps ◽  
Long Distance ◽  
Column Separation ◽  
In Series ◽  
Hydraulic Capsule Pipeline

The dynamics of a booster station, which is critical for the control of a novel, long distance, hydraulic capsule pipeline, is simulated mathematically for design studies and control of the hydraulic transients caused by the valve actuators in the system. Several modifications to the pump bypass station configuration of the booster station have been studied. With the objective of eliminating column separation and reducing flow reversals, a configuration with several centrifugal pumps connected in series, and a carefully sized air chamber is found to be a viable design. A valve control method is designed to eliminate column separation and the design results in acceptable flow reversal levels in the main pipe. The simulation results match with trends in limited experimental studies performed on a small scale experimental capsule pipeline system.

Study on Cooperative Control Method among Large Flow and Long-Distance Intersections

2015 ◽  
Vol 744-746 ◽  
pp. 2006-2011
Author(s):  
Jian Lu ◽  
Jin Gang Gu ◽  
Qiang Fu ◽  
Ya Li
Keyword(s):  
Traffic Flow ◽  
Cooperative Control ◽  
Control Method ◽  
Flow Characteristics ◽  
Signal Control ◽  
Coordination Control ◽  
Long Distance ◽  
Average Delay ◽  
Traffic Flow Characteristics ◽  
Large Flow

Large flow and long distance intersections are very difficult to bring out coordination control and very easy to emerge traffic problems such as traffic congestion due to the large flow and long distance and traffic discrete. It’s necessary to analysis the traffic flow characteristics among large flow and long distance intersections and take measure to improve the signal control. This paper analyzed the traffic flow characteristics of the large flow and long distance intersections, such as the speed would be faster than the normal road between near distance intersection, the headway between cars would be increased, and long traffic queue would be easily occurred at the downstream intersection. In order to realize the coordination control between far intersections, measures for example puts forward signal light at an appropriate position between the intersections, set up fences between vehicles and bicycles, and intersection channelized were put forward to rebuild the traffic flow to adjust the signal control. Those measures were applied to the intersections in Danyang which located in Jiangsu province, the results shows that the queue length was reduced by 67.4% at downstream intersection, the average delay was reduced by 60.3%, the traffic flow saturation was reduced to0.67, and the travel speed and travel time would all become better than before. It suggested that those methods could realize the coordination control and its effect was good, and have good feasibility and practicability.

Complex shape product tolerance and accuracy control method for virtual assembly

2015 ◽  
Author(s):  
Huiping Ma ◽  
Yuanqiang Jin ◽  
Xiaoguang Zhang ◽  
Hai Zhou
Keyword(s):  
Complex Shape ◽  
Control Method ◽  
Virtual Assembly ◽  
Accuracy Control

scholarly journals A Driver and Control Method for Primary Stator Discontinuous Segmented-PMLSM

Symmetry ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 2216
Author(s):  
Mingyi Wang ◽  
Kai Kang ◽  
Chengming Zhang ◽  
Liyi Li
Keyword(s):  
Control Method ◽  
Full Range ◽  
Transportation Systems ◽  
Current Loop ◽  
Position Tracking ◽  
Tracking Accuracy ◽  
Material Transport ◽  
Long Distance ◽  
And Control ◽  
Thrust Fluctuation

In recent years, with the development of the permanent magnet linear synchronous motor (PMLSM), the application of PMLSM has not been limited only to the high-end equipment field; the primary stator discontinuous segmented-PMLSM (DSPMLSM), which consists of multiple primary stators and one mover, has also been applied in long-distance transportation systems, such as electromagnetic launch, high precision material transport, etc. Compared with the symmetry phase parameters of conventional PMLSM, the stationary electrical parameters vary when the mover enters and leaves the primary stators (the inter-segment region). At the same time, due to the sectional power supply, there will be primary suction or pulling force when the mover enters and exits the inter-segment region, which will lead to large thrust fluctuation and result in lager position error. This paper proposed a related drive and control strategy about the DSPMLSM system, which improved the position tracking accuracy during the full range of DSPMLSM. First, the parameter variation between stator segments has been analyzed through finite element simulation of DSPMLSM. Then, a double closed-loop series control structure of position-current is designed, in which a PI-Lead controller was adopted for the position loop and a PI controller was adopted for the current loop. In order to improve the position tracking accuracy of DSPMLSM, a thrust fluctuation extended state observer (TFESO) was adopted to observe and compensate the complex thrust disturbances such as cogging force, friction and other unmodeled thrust fluctuation. At last, the DSPMLSM experimental stage was established, and the experimental results show that the proposed driver and control theory can effectively improve the position tracking accuracy of the whole stroke of DSPMLSM.

The Belt Conveyor Control of Large Dip Angle by FMBTES

2014 ◽  
Vol 905 ◽  
pp. 452-458
Author(s):  
Yuan Bin Hou ◽  
Mao Quan Zheng ◽  
Xin Zhao Wang ◽  
Ya Li Xue
Keyword(s):  
Expert System ◽  
Coal Mine ◽  
Control Method ◽  
Shaanxi Province ◽  
Dynamic Resistance ◽  
Belt Conveyor ◽  
Long Distance ◽  
Bayes Theory ◽  
Dip Angle ◽  
Start Process

Based on the analysis of dynamic characteristics of the belt conveyor with the long distance and the large dip angle in coal mine, a kind fusion method of Bayes theory and expert system (FMBTES) is proposed which is control method with the change regular of the start process. First, the structure and dynamics model are established for belt conveyor, the priori distributions of the system implementation state is supposed, the conditional probability of dynamics state is made using Bayes theory, next, the change regular of the start process pull force is found, and the change regular of the dynamic resistance is found for belt conveyor,on this basis,the control rule of expert system is established. The FMBTES method is verified by data simulation of Shaanxi Province Huangling Jianzhuang coal mine, which is large dip angle section of the four sections type belt conveyor system, belt length is 1200m. The dynamic characteristic of this method is better than the traditional expert system.

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