Analytical research on unified power quality conditioner based on super capacitors energy storage system

Author

Hailiang, Zhou ; Jianru, Wan ; Chenhu, Yuan ; Shuchao, Li

Author_Institution

Sch. of Electr. Eng. & Autom., Tianjin Univ., Tianjin, China

fYear

2011

fDate

8-10 June 2011

Firstpage

1

Lastpage

5

Abstract

To extend the compensation ability of unified power quality conditioner (UPQC) and suppress the grid current fluctuation at the time of power regulation, a kind of improved UPQC topological structure is proposed. With advantages of high power density, large electrostatic capacity and long cycle life, super capacitors are combined with bidirectional DC/DC converter to compose the energy storage system in parallel with DC-link to keep DC voltage constant and to be used also as a spare UPS. Low frequency mathematical model of the conditioner under dq coordinates based on state-space method is built and non-PLL compensation detecting method is applied. In addition, both the control strategy of voltage and current compensation and energy management schemes of super capacitors are given. This structure provides a new fitting way for UPQC and simulation results show clearly the feasibility.

Keywords

DC-DC power convertors; compensation; energy management systems; phase locked loops; power grids; power supply quality; state-space methods; supercapacitors; uninterruptible power supplies; voltage control; DC voltage; UPQC topological structure; bidirectional DC-DC converter; current compensation; dq coordinates; electrostatic capacity; energy management schemes; grid current fluctuation suppression; high power density; low frequency mathematical model; nonPLL compensation detecting method; power regulation; spare UPS; state-space method; supercapacitor energy storage system; unified power quality conditioner; voltage control strategy; Bidirectional control; Capacitors; Energy storage; Inverters; Mathematical model; Power quality; Voltage control; UPQC; bi-direction DC/DC; energy management; non-PLL; super capacitors;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Systems and Applications (PESA), 2011 4th International Conference on

Conference_Location

Hong Kong

Print_ISBN

978-1-4577-0205-1

Type

conf

DOI

10.1109/PESA.2011.5982933

Filename

5982933