A new principle of UHVDC line pilot protection based on trigger angle control characteristics

2020 ◽  
Vol 21 (4) ◽  
Author(s):  
Lu Wang ◽  
Zhenxing Li ◽  
Tan Hong ◽  
Hanli Weng ◽  
Zhenhua Li
Keyword(s):  
Control System ◽  
Trigger Delay ◽  
Internal Fault ◽  
Internal Parameters ◽  
Simulation Based ◽  
Transition Resistance ◽  
Change Tendency ◽  
Pilot Protection

AbstractA new principle of UHVDC Line pilot protection based on internal parameters of the trigger angle of converter is proposed, in order to improve the ability of the protection to withstand transition resistance. Through the analysis of UHVDC control system, it is found that, due to the regulation of control system, in terms of trigger delay angle of rectifier side and trigger leading angle of inverter side, the change tendency in internal fault and external fault is different. Thus, the protection criterion is constructed. Compared with the traditional protection principle using voltage and current to establish protection criteria, this principle uses internal parameters as protection quantity. The simulation based on PSCAD/EMTDC verifies the effectiveness of the protection principle.

A Novel Pilot Protection for HVDC Transmission Lines Based on Model Error Function

2013 ◽  
Vol 397-400 ◽  
pp. 1878-1882
Author(s):  
Dong Li ◽  
Xing Fu Jin
Keyword(s):  
Transmission Lines ◽  
Error Function ◽  
Model Error ◽  
Hvdc Transmission ◽  
High Voltage Direct Current ◽  
Internal Fault ◽  
Hvdc Transmission Lines ◽  
Transition Resistance ◽  
Capacitance Model ◽  
Pilot Protection

In order to solve the problems in existing protection for high voltage direct current (HVDC) transmission lines, such as insufficient sensitivity for main protection and slow operation for backup protection, a novel pilot protection for HVDC transmission lines based on model error function is proposed in this paper. In the principle, through analyzing the fault component networks, external fault is equivalent to a capacitance model, while the internal fault is equivalent to a inductance model. Taking capacitance model as a benchmark, the model error function was defined to describe the degree of consistency between actual fault data and the benchmark. When an external fault occurs, fault data agree with the capacitance model and model error equals zero. When an internal fault occurs, fault data do not agree with the capacitance model and model error does not equal zero. According to this, a protection criterion is constructed. Theoretical analysis and simulation show that the new principle, not affected by transition resistance and line distributed capacitance current, can identify internal faults and external faults reliably and rapidly.

Hydraulic Control System Modeling and Simulation Based on the MSC. Easy5

2012 ◽  
Vol 619 ◽  
pp. 435-438
Author(s):  
Li Jun Luan ◽  
Xiao Miao Qi ◽  
Ji Yong Ni
Keyword(s):  
Control System ◽  
Modeling And Simulation ◽  
System Modeling ◽  
Vertical Shaft ◽  
Hydraulic Control ◽  
Simulation Based ◽  
Simulation Parameters ◽  
Hydraulic Control System

This paper creates the model of the hydraulic control system and does simulation by using powerful function of modeling and simulation of MSC. Easy5. To help support the equipment of the hydraulic control system Vertical Shaft for example Firstly, creates the model of the Vertical Shaft hydraulic control system through the software MSC. Easy5. Secondly, input relevant simulation parameters and do simulation. Finally, analyze the results of simulation.

Simulation of PFC Algorithm in the System of Tension Control of Shaftless Driven

2013 ◽  
Vol 823 ◽  
pp. 374-377
Author(s):  
Meng Tao Huang ◽  
Yan Jun Zhou ◽  
Jing Ma
Keyword(s):  
Control System ◽  
Prediction Model ◽  
Tension Control ◽  
Order System ◽  
Reference Trajectory ◽  
Prediction Horizon ◽  
Internal Parameters ◽  
Constant Tension ◽  
Depth Study ◽  
Tension Control System

Through the in-depth study of working principle and application of PFC algorithm, the paper introduces PFC algorithm to the constant tension control of the system of shaftless driven in printer. In order to better implement constant tension control of shaftless driven control system, the paper choose a first order system as the transfer function of the system of tension model. The paper carries on the silulation of the system’s output of constant tension ,aiming at the situation of the changing of the internal parameters of prediction model for PFC algorithm, such as the attenuation coefficient of reference trajectory , the change of fitting points , prediction horizon and so on, matching of prediction model and tension model of PFC algorithm. The simulation system provides a theoretical basis to build the actual tension control system.

Introduction of the Foot Placement Estimator: A Dynamic Measure of Balance for Bipedal Robotics

2007 ◽  
Vol 3 (1) ◽  
Author(s):  
Derek L. Wight ◽  
Eric G. Kubica ◽  
David W. L. Wang
Keyword(s):  
Control System ◽  
Gait Cycle ◽  
State Machine ◽  
Gait Initiation ◽  
External Disturbances ◽  
Foot Placement ◽  
Simulation Based ◽  
Under Construction ◽  
Linear Controllers ◽  
Stability Results

The goal of most bipedal robotics research is to develop methods of achieving a dynamically balanced gait. Most current approaches focus on maintaining the balance of the system. This paper introduces a measure called the foot placement estimator (FPE) to restore balance to an unbalanced system. We begin by developing a theoretical proof to define when a biped is stable, as well as defining the region in which stability results are valid. This forms the basis for the derivation of the FPE. The results of the FPE are then extended to a complete gait cycle using the combination of a state machine and simple linear controllers. This control system is applied to a detailed and realistic simulation based on a physical robot currently under construction. Utilizing the FPE as a measure of balance allows us to create dynamically balanced gait cycles in the presence of external disturbances, including gait initiation and termination, without any precalculated trajectories.

Elevator Feel and Centering Unit Simulation Based on SimMechanics

2007 ◽  
Vol 10-12 ◽  
pp. 424-429
Author(s):  
Yu Yang ◽  
D.C. Cong ◽  
Jun Wei Han
Keyword(s):  
Control System ◽  
Flight Control ◽  
Flight Simulator ◽  
Flight Control System ◽  
Control Module ◽  
Simulation Based ◽  
Loading System ◽  
System Module ◽  
Control Column ◽  
Command Signal

The force of control column is very important for the pilot in a flight simulator. So the control loading system in the flight simulator has been concerned since the flight simulator appeared. As the force command signal generated part of control loading system, flight control system module is the most important module for the fidelity of control loading system. This paper described a method to build flight control module. We used SimMechanics in simulink to model and analyze the feel and centering unit, which is the key part of feeling system in the flight control system, and in this paper we described the structure of the control loading system, and the function of the feel and centering unit.

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