High Power Neutral Point Clamped (NPC) Multilevel UPFC with DC Link Switch for Effective Control of Real & Reactive Power

R Sanjay Kumar; Vivek Patel; Rajesh Sahu

High-voltage and power capability of multilevel converters better used for unified power-flow controller (UPFC) applications. The three-level neutral-point-clamped (NPC) converter allows back-to-back connection as the UPFC shunt and series converters than other multilevel topologies. In place of the pulse width-modulated (PWM) multilevel control schemes, constant dc-link voltage and balanced voltages in the NPC multilevel dc capacitors is necessary for UPFCs. The proposed work provides three main contributions to increase the performance of the system of multilevel UPFCs as this can be operated in STATCOM, SSSC and exactly in the UPFC mode with the double balancing of dc capacitor voltages under line faults, overall enhancing the UPFC ride-through capability. NPC series and shunt converters keep the dc-link voltage steady. Transients are the causes of fault in power system, Power System Stabilizer (PSS) and Automatic Voltage Regulator (AVR) are used to stabilize the response. The voltage regulator and current controller plays important roll to generate control pulses for VSC. A MATLAB simulation has been carried out to demonstrate the performance of the proposed model for UPFC in achieving transient stability with real and reactive power control.

Select Volume / Issues:

• Volume 7,Issue 1, Jan. 2016

Year:

2016

Type of Publication:

Article

Keywords:

Power System Stabilizer; unified power-flow controller; neutral-point-clamped; Voltage source converters; The Flexible Alternating Current Transmission System; Automatic Voltage Regulator; proportional integral

Journal:

IJECCE

Volume:

7

Number:

1

Pages:

38-43

Month:

January

ISSN:

2249-071X