Unified power-flow control concept for flexible AC transmission systems

1992 ◽  
Vol 139 (4) ◽  
pp. 323 ◽  
Author(s):  
L. Gyugyi
Keyword(s):  
Flow Control ◽  
Power Flow ◽  
Flexible Ac Transmission Systems ◽  
Transmission Systems ◽  
Power Flow Control ◽  
Flexible Ac Transmission ◽  
Control Concept ◽  
Ac Transmission

scholarly journals Control of a Modular Multilevel Matrix Converter for Unified Power Flow Controller Applications

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 953 ◽  
Author(s):  
Alberto Duran ◽  
Efrain Ibaceta ◽  
Matias Diaz ◽  
Felix Rojas ◽  
Roberto Cardenas ◽  
...  
Keyword(s):  
Power Flow ◽  
Matrix Converter ◽  
Unified Power Flow Controller ◽  
Flexible Ac Transmission Systems ◽  
Transmission Systems ◽  
Feeding Mode ◽  
Flexible Ac Transmission ◽  
Flow Controller ◽  
Ac Transmission ◽  
Power Flow Controller

The modular multilevel matrix converter has been proposed as a suitable option for high power applications such as flexible AC transmission systems. Among flexible AC transmission systems, the unified power flow controller stands out as the most versatile device. However, the application of the modular multilevel matrix converter has not been thoroughly analyzed for unified power flow controller applications due to the sophisticated control systems that are needed when its ports operate at equal frequencies. In this context, this paper presents a cascaded control structure for a modular multilevel matrix converter based unified power flow controller. The control is implemented in a decoupled reference frame, and it features proportional-integral external controllers and internal proportional multi-resonant controllers. Additionally, the input port of the modular multilevel matrix converter is regulated in grid-feeding mode, and the output port is regulated in grid-forming mode to provide power flow compensation. The effectiveness of the proposed vector control system is demonstrated through simulation studies and experimental validation tests conducted with a 27-cell 5 kW prototype.

Flexible AC Transmission Systems (FACTS) Controller in Power Transmission

2018 ◽  
pp. 158-193
Keyword(s):  
Power System ◽  
Power Flow ◽  
Power Transmission ◽  
Unified Power Flow Controller ◽  
Flexible Ac Transmission Systems ◽  
Transmission Systems ◽  
Flexible Ac Transmission ◽  
Facts Devices ◽  
Bus Voltage ◽  
Ac Transmission

Secure and reliable operation of the power system is a critical issue for large, complicated, and interconnected power system networks. Security constraints such as thermal limits of transmission lines and bus voltage limits must be satisfied under any operating point in order to deliver reliable power to the consumers. One of the best alternative solutions of improvement of the security of power system is the use of flexible AC transmission systems (FACTS) devices. FACTS devices can be used to limit the power flow on the overloaded line and to increase the use of alternative paths to improve power transmission capacity. This chapter briefly describes all three categories of FACTS devices, namely shunt controllers (static synchronous compensator, static var compensator, thyristor-controlled reactor, thyristor switched reactor, thyristor switched capacitor), series controllers (static synchronous series compensator, thyristor controlled series capacitor, thyristor-controlled series reactor), and combined series-shunt controllers (unified power flow controller).

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