Design of Power Flow Controllers Based on Two-Leg Four-Switch Three Phase Power Converter

• Main Authors: Tai-Chi Chiang, 江泰祈
• Other Authors: Tsao-Tsung Ma
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/26223247048890248097

碩士 === 國立聯合大學 === 電機工程學系碩士班 === 99 === This thesis is focused on the design of low-cost high-performance power system controllers, in which static synchronous compensators (STATCOM) and static series synchronous compensators (SSSC) are two major design targets. The development of the proposed power flow controllers is mainly based on the hardware configuration of a 2-leg 4-switch (2L4S) three-phase inverter and issues regarding advantages and possible limitations in performing power flow regulation and voltage control functions are the main concerns. In this thesis, a number of switching techniques, e.g. voltage hysteresis, sinusoidal pulse width modulation and space vector pulse width modulation techniques are investigated. The concepts of P-Q axis control scheme and the conventional PI controllers are utilized in the proposed power flow controllers. The main control functions designed for the proposed hardware simplified compensators include the dynamic voltage control and P-Q regulations of power networks. To demonstrate the feasibility of the proposed controllers and verify their performances, a set of simulation cases on simplified power systems are constructed in the MATLAB/SIMULINK software environment and comprehensive simulation studies are carried out. Results obtained from various case studies verify the feasibility and effectiveness of the proposed 2L4S based power flow controllers. Keywords: power system control, power flow controller, power converter, static synchronous compensator, static series synchronous compensators