TY - GEN
T1 - A single-phase grid-connected PV inverter with improved grid-connected current
AU - Xiao, Furong
AU - Dong, Lei
AU - Liao, Xiaozhong
N1 - Publisher Copyright:
© 2015 IEEE.
PY - 2015/7/17
Y1 - 2015/7/17
N2 - This paper presents an effective method, which can address the existing dc-link double-line-frequency voltage ripples in single-phase grid-connected PV inverters, to improve the grid-connected current. The instantaneous power pulsations at grid side cause double-line-frequency fluctuations of the dc-link voltage in single-phase grid-connected PV systems. A PI controller is generally used to regulate the dc-link voltage and its output is used to generate the grid-connected current reference. Since the PI controller cannot effectively attenuate the double-line-frequency components, the generated grid-connected current reference suffers from harmonic components. As a consequent, the actual current injected to the grid also contains the undesirable harmonic components, which leads to a high total harmonic distortion (THD). To improve the grid-connected current, an adaptive filter, which can filter the double-line-frequency voltage ripples, is inserted into the dc-link voltage feedback control loop in this research work. In this way, the generated grid-connected current reference can be free from the negative effects of dc-link double-line-frequency voltage ripples. The principle of the proposed approach is presented in detail, and the simulation as well as the experimental results corroborates the theoretical analysis.
AB - This paper presents an effective method, which can address the existing dc-link double-line-frequency voltage ripples in single-phase grid-connected PV inverters, to improve the grid-connected current. The instantaneous power pulsations at grid side cause double-line-frequency fluctuations of the dc-link voltage in single-phase grid-connected PV systems. A PI controller is generally used to regulate the dc-link voltage and its output is used to generate the grid-connected current reference. Since the PI controller cannot effectively attenuate the double-line-frequency components, the generated grid-connected current reference suffers from harmonic components. As a consequent, the actual current injected to the grid also contains the undesirable harmonic components, which leads to a high total harmonic distortion (THD). To improve the grid-connected current, an adaptive filter, which can filter the double-line-frequency voltage ripples, is inserted into the dc-link voltage feedback control loop in this research work. In this way, the generated grid-connected current reference can be free from the negative effects of dc-link double-line-frequency voltage ripples. The principle of the proposed approach is presented in detail, and the simulation as well as the experimental results corroborates the theoretical analysis.
KW - double-line-frequency
KW - harmonic current
KW - power pulsation
KW - total harmonic distortion (THD)
UR - http://www.scopus.com/inward/record.url?scp=84945581350&partnerID=8YFLogxK
U2 - 10.1109/CCDC.2015.7162639
DO - 10.1109/CCDC.2015.7162639
M3 - Conference contribution
AN - SCOPUS:84945581350
T3 - Proceedings of the 2015 27th Chinese Control and Decision Conference, CCDC 2015
SP - 4083
EP - 4088
BT - Proceedings of the 2015 27th Chinese Control and Decision Conference, CCDC 2015
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 27th Chinese Control and Decision Conference, CCDC 2015
Y2 - 23 May 2015 through 25 May 2015
ER -