scholarly journals Adaptability and Countermeasures of HVDC line protection under the UHVDC system with multiple receiving ends

2021 ◽  
Vol 256 ◽  
pp. 01005
Author(s):  
Zhengguang Chen ◽  
Xingguo Wang ◽  
Shuyang Wang ◽  
Hong Cao
Keyword(s):  
Structural Characteristics ◽  
Series Connection ◽  
Protection Strategy ◽  
Hvdc System ◽  
Hvdc Line ◽  
In Series ◽  
Closed Line ◽  
Output Characteristics ◽  
Geographical Locations ◽  
Mode A

In UHVDC transmission system, the inverter station is located in different geographical locations, and there are two sections of lines in single pole of HVDC system, which brings challenges to the traditional closed line protection. In this paper, firstly, the structural characteristics of series connection mode and the output characteristics of each converter in case of line fault are analysed, and the adaptability of conventional line protection in series multiple receiving ends system is studied. According to the characteristics of UHVDC system with multiple receiving ends in series connection mode, a hierarchical protection strategy is proposed and verified in PSCAD model.

scholarly journals Research on DC Protection Strategy in Multi-Terminal Hybrid HVDC System

Engineering ◽  
2021 ◽  
Author(s):  
Yuping Zheng ◽  
Jiawei He ◽  
Bin Li ◽  
Tonghua Wu ◽  
Wei Dai ◽  
...  
Keyword(s):  
Protection Strategy ◽  
Hvdc System

Development of Back-to-Back Flexible HVDC Prototype Based on MMC

2013 ◽  
Vol 397-400 ◽  
pp. 1808-1813
Author(s):  
Cheng Feng ◽  
Da Li Wang ◽  
Jin Li
Keyword(s):  
Circuit Design ◽  
High Power ◽  
Working Condition ◽  
Protection Strategy ◽  
Hvdc System ◽  
Fault Protection ◽  
The World

With the development of flexible HVDC technology in the world, back-to-back HVDC system based on MMC topology have more attention. A high power back-to-back flexible HVDC prototype has been developed to assess performance and reliability of construction of converter valve segment. Valve normal working condition (rated conditions rated voltage, current, temperature), valve transient working condition (temporary overvoltage, overcurrent), valve fault protection and anti-interference ability are accessed. Performance and reliability of control and protection equipment are assessed. The design of control and protection strategy is optimized. The correctness of main circuit design is tested.

Grounding Fault in Series-Connection-Based Offshore Wind Farms: Fault Clearance

2020 ◽  
Vol 35 (9) ◽  
pp. 9357-9367
Author(s):  
Gaopeng Guo ◽  
Kunpeng Zha ◽  
Jiao Zhang ◽  
Zhibing Wang ◽  
Fan Zhang ◽  
...  
Keyword(s):  
Wind Farms ◽  
Offshore Wind ◽  
Series Connection ◽  
Offshore Wind Farms ◽  
In Series ◽  
Fault Clearance

Generalized modeling and character analyzing of composite fractional-order memristors in series connection

2018 ◽  
Vol 95 (1) ◽  
pp. 101-115 ◽  
Author(s):  
Zhang Guo ◽  
Gangquan Si ◽  
Xiang Xu ◽  
Kai Qu ◽  
Shuang Li
Keyword(s):  
Fractional Order ◽  
Series Connection ◽  
In Series

Multi-Manual Emergency Escaping System of Air Control Bus Door Based on Driver and Passenger Manipulation

2012 ◽  
Vol 588-589 ◽  
pp. 1476-1479
Author(s):  
Zhi Wei Qi ◽  
Ting Jun Wang ◽  
Zhao Ma ◽  
Xiao Chen ◽  
Bi Jun Shen
Keyword(s):  
Control Device ◽  
Mutual Interference ◽  
The State ◽  
Manual Control ◽  
Series Connection ◽  
Bus Driver ◽  
In Series ◽  
Control Devices ◽  
Working Performance ◽  
Air Control

For controlling emergency escaping by a bus driver in the case of air control door cannot be opened normally, the paper presented a multi-manual emergency escaping system of pneumatic bus door. Bus driver and passenger can control doors expediently. The pneumatic circuit of the system and its overall arrangement is discussed. A manual control device with special valve core structure is designed. The working performance of the manual shift directional valve is analyzed. The results indicate that driver and passengers can control the bus doors under the state of abnormal condition via manual control devices in series connection rapidly. Driver and passengers control is without mutual interference. Manual shift directional valves are convenient, reliable and fast.

A Novel 5-DOF NC Serial-Parallel Machine Tool and its Position Analysis

2010 ◽  
Vol 431-432 ◽  
pp. 355-360
Author(s):  
Hong Jun San ◽  
Shi Sheng Zhong ◽  
Zhi Xing Wang
Keyword(s):  
Machine Tool ◽  
Analytical Method ◽  
Parallel Mechanism ◽  
Degrees Of Freedom ◽  
Structural Characteristics ◽  
Parallel Machine ◽  
Numerical Control ◽  
Forward Solution ◽  
In Series ◽  
Parallel Machine Tool

In this paper, a novel 5 degrees-of-freedom (DOF) numerical control (NC) serial-parallel machine tool is proposed. It can provide 3 translational DOF and 2 rotational DOF. The proposed mechine tool is composed of a 2-TPR/2-TPS special 4-DOF parallel mechanism in series with a rotatable component. The structure of this machine tool is simple. The machine tool can process the workpieces which have complex surfaces.The structural characteristics of this machine tool is introduced. The position inverse solution of this machine tool is deduced by analytical method and the position forward solution of this machine tool is achieved by numerical method.

Sign in / Sign up

Export Citation Format

Share Document