Benchmarking of power control strategies for photovoltaic systems under unbalanced conditions

被引：26

作者：

Cupertino, Allan F. ^{[1
,2
]}

Xavier, Lucas S. ^{[2
]}

Brito, Erick M. S. ^{[2
]}

Mendes, Victor F. ^{[2
]}

Pereira, Heverton A. ^{[3
]}

机构：

[1] Fed Ctr Technol Educ Minas Gerais, Dept Mat Engn, Av Amazonas 5253, BR-30421169 Belo Horizonte, MG, Brazil

[2] Univ Fed Minas Gerais, Grad Program Elect Engn, Av Antonio Carlos 6627, BR-31270901 Belo Horizonte, MG, Brazil

[3] Univ Fed Vicosa, Dept Elect Engn, Av P H Rolfs S-N, BR-36570000 Vicosa, MG, Brazil

来源：

INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS | 2019年 / 106卷

关键词：

Photovoltaic systems; Unbalanced conditions; Power control strategies; Energy storage requirements; Thermal stress analysis; PEAK CURRENT LIMITATION; ACTIVE POWER; INVERTERS;

D O I：

10.1016/j.ijepes.2018.10.014

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Unbalanced voltage sags are common phenomenon in power systems which affects the performance of grid connected photovoltaic (PV) systems. The unbalanced voltage conditions results in double-line frequency power oscillations. These oscillations increase the dc-link voltage ripple leading to higher stresses in dc-link capacitors. In this case, the literature presents many power control strategies in order to improve the performance of PV systems during unbalanced conditions. Nevertheless, a deep comparison of these strategies has been missing. This work presents a complete analysis of the main power control strategies proposed in the literature. The energy storage requirements of the converter are analytically deduced and some guidelines for the dc-link design are presented. Furthermore, a case study based on a 11 kW PV system is used to compare the performance of the most interesting strategies in terms of dynamic behaviour, power oscillations and dc-link voltage ripple. Furthermore, the dc-link capacitors stress is discussed, considering the characteristics of reactive power injection, which is required by the modern grid codes. The power losses and the thermal stresses in dc-link capacitors are evaluated and the worst operational scenario is obtained for each power control strategy.

引用

页码：335 / 345

页数：11

共 22 条

[1] Control Strategy for Three-Phase Grid-Connected PV Inverters Enabling Current Limitation Under Unbalanced Faults [J].