A Novel Multi-Station Cooperative Negative Sequence Current Compensation Method for High-Speed Railway

2019 ◽  
pp. 1-1
Author(s):  
Feiran Xiao ◽  
Jiaxin Yuan ◽  
Zhou Ni
Keyword(s):  
High Speed ◽  
Compensation Method ◽  
High Speed Railway ◽  
Current Compensation ◽  
Negative Sequence ◽  
Negative Sequence Current

A Novel STATCOM Based on Flying Capacitor Modular Multilevel Converter

2018 ◽  
Vol 6 (11) ◽  
pp. 86
Author(s):  
T. Sanjeeva Rao ◽  
T. Sowjanya
Keyword(s):  
Control Method ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Static Synchronous Compensator ◽  
Current Compensation ◽  
Negative Sequence ◽  
Capacitor Voltage ◽  
Voltage Balance ◽  
Capacitor Voltage Balance ◽  
Negative Sequence Current

A new static synchronous compensator (STATCOM) based on Flying Capacitor modular multilevel converter (DCM2C) is proposed in this thesis. In this converter topology the capacitor voltage is clamped by using a low power rating diode in each sub-module (SM). The quantity of voltage sensors is significantly reduced and is free from the number of voltage levels. Furthermore the voltage balancing control method becomes very simple and the capacitor voltage balance speed is fast. Based on the structure of MMC the DCM2C-STATCOM has the capability of Var compensation and negative sequence current compensation. The topology characteristics and compensation control method of DCM2C-STATCOM are investigated in this thesis. That the capacitor voltage of the proposed DCM2C-STATCOM can be well balanced and the Var and negative-sequence current compensation are effective.

Design of New Load Balancers for Modern High Speed Railway Systems

2010 ◽  
Vol 11 (1) ◽  
Author(s):  
Wen-Shyan Chu ◽  
Jhy-Cherng Gu ◽  
Sanyi Lee ◽  
Bin-Kwie Chen
Keyword(s):  
Low Power ◽  
Imaginary Part ◽  
Power Factor ◽  
High Speed ◽  
Positive Sequence ◽  
High Speed Railway ◽  
Railway Systems ◽  
Delta Type ◽  
Load Balancer ◽  
Negative Sequence Current

Traditional electric trains have a low power factor, high loading variation change and inefficiency, generating both negative sequence current and the imaginary part of positive sequence current. Delta type Load Balancer associated with specially connected transformers is generally adopted to correct power factor and voltage imbalance. However, the modern trains used in High Speed Railway (HSR) have a power factor approximately close to unity, and therefore only need voltage imbalance correction. This study presents novel Load Balancer schemes, which are a modification of the Delta-type Load Balancer, with various connected transformers to correct imbalance. The symmetric component method is also adopted to determine the installation capacity of the proposed Load Balancer schemes.

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