Voltage-Sensorless Control Scheme for a Grid Connected Inverter UsingDisturbance Observer

Collection with item attached
2017
Item details URL
http://open-repository.kisti.re.kr/cube/handle/open_repository/486943.do
DOI
10.3390/en10020166
Title
Voltage-Sensorless Control Scheme for a Grid Connected Inverter UsingDisturbance Observer
Description
This research was supported by Basic Science Research Program throughthe National Research Foundation of Korea (NRF) funded by the Ministryof Education (NRF-2016R1D1A1B03930975). This work was also supported bythe Human Resources Development of the Korea Institute of EnergyTechnology Evaluation and Planning (KETEP) grant funded by the Koreagovernment Ministry of Trade, Industry & Energy (NO. 20154030200720).
abstract
A grid connected inverter usually requires voltage and current measurements to control the active and reactive powers as well as the inverter output currents. While voltage sensors are essential to obtain reliable information on the phase angle, these additional components certainly increase the production costs and complexity. In this paper, a voltage-sensorless control scheme for a grid connected inverter using a disturbance observer (DOB) is presented. The grid voltages are estimated by DOB in the stationary reference frame using the current measurements and reference signals. Even though the DOB estimates the grid voltages with reasonable accuracy in the presence of the uncertainty such as the unbalanced condition and harmonic distortion, the resultant waveform shows a phase lag depending on the estimation bandwidth. To overcome this limitation, a phase lead compensation is introduced. By using these techniques, the phase angle of grid voltages can be completely restored even if the phase angle of grid is initially unknown. The proposed scheme is simple and straightforward. In addition, it does not require any additional hardware. The feasibility of the proposed voltage-sensorless control scheme is demonstrated through simulations and experiments using 2 kVA prototype inverter.
provenance
Made available in Cube on 2018-09-28T16:21:04Z (GMT). No. of bitstreams: 0
language
English
author
Kim, Hyun-Sou
Kim, Kyeong-Hwa
orcid
Kim, Kyeong-Hwa/0000-0001-5251-6322
accessioned
2018-09-28T16:21:04Z
available
2018-09-28T16:21:04Z
issued
2017
citation
ENERGIES(10): 2
issn
1996-1073
uri
http://open-repository.kisti.re.kr/cube/handle/open_repository/486943.do
Funder
교육부
Funding Program
개인기초연구(교육부)
Project ID
1345269799
Jurisdiction
Rep.of Korea
Project Name
A Study on the Coordinated Autonomous Control and Condition Monitoring Scheme of Power Electronics Converter to Improve the Operating Efficiency and Reliability of Microgrid
rights
openAccess
subject
distributed generation (DG)
disturbance observer (DOB)
estimation ofgrid voltages and phase angle
grid connected inverter
voltage-sensorless control
type
article


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