Stabilisation of asymmetrically structured back-to-back static synchronous compensator system with non-linear damping control
- Authors
- Lee, Young Ok; Gui, Yonghao; Han, Youngseong; Chung, Chung Choo
- Issue Date
- Oct-2015
- Publisher
- WILEY
- Keywords
- static VAr compensators; rectifiers; reactive power control; power convertors; feedback; invertors; three-term control; Lyapunov methods; closed loop systems; stabilisation; asymmetrically structured back-to-back static synchronous compensator system; nonlinear damping control; asymmetrically structured converters; mathematical model; BTB STATCOM; pulse-width modulation technology; rectifier station; multipulse technology; inverter station; control strategy; DC voltage; reactive rectifier powers; active rectifier powers; rectifier station; input-output linearisation; feedback control law; indirect damping controller; reactive current; inverter station; stability margin; DC voltage oscillation; degraded reactive current tracking performance; proportional-plus-integral-plus-derivative controller; semiglobally exponential stability; parameter-dependent Lyapunov function; composite Lyapunov function; PDL function; output regulation error; closed-loop stability
- Citation
- IET POWER ELECTRONICS, v.8, no.10, pp.1952 - 1962
- Indexed
- SCIE
SCOPUS
- Journal Title
- IET POWER ELECTRONICS
- Volume
- 8
- Number
- 10
- Start Page
- 1952
- End Page
- 1962
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/143117
- DOI
- 10.1049/iet-pel.2015.0004
- ISSN
- 1755-4535
- Abstract
- This study describes a new back-to-back static synchronous compensator (BTB STATCOM) system with asymmetrically structured converters and develops its mathematical model. BTB STATCOM uses pulse-width modulation technology for a rectifier station along with multipulse technology for an inverter station. The authors propose a control strategy for the following three control variables: DC voltage and both active and reactive rectifier powers. In the rectifier station, input-output linearisation via the feedback control law is applied for independent control of the active and reactive powers. Conversely, the controller is not applicable for maintaining the DC voltage because of its irregularity. They design an alternative indirect damping controller for the reactive current within the inverter station. The proposed controller improves the stability margin and decreases the oscillation of DC voltage with a degraded reactive current tracking performance of the inverter. Using simulation, they validate the proposed method, comparing its effectiveness to that of a proportional-plus-integral-plus-derivative controller. They investigate the semi-globally exponential stability of the damped internal dynamics using a parameter-dependent Lyapunov (PDL) function. Using a composite Lyapunov function based on the PDL function, the uniform boundedness of the output regulation error as well as the closed-loop stability is established.
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