Reactive Power Compensation and Optimization Strategy for Grid-Interactive Cascaded Photovoltaic Systems

被引:148
作者
Liu, Liming [1 ]
Li, Hui [1 ]
Xue, Yaosuo [2 ]
Liu, Wenxin [3 ]
机构
[1] Florida State Univ, Ctr Adv Power Syst, Tallahassee, FL 32310 USA
[2] Siemens Corp Res, Princeton, NJ 08540 USA
[3] New Mexico State Univ, Las Cruces, NM 88003 USA
关键词
Cascaded photovoltaic (PV) system; power-voltage distribution; reactive power compensation; unsymmetrical active power; H-BRIDGE CONVERTER; MULTILEVEL CONVERTER; VOLTAGE; TOPOLOGIES; STATCOM; INVERTERS;
D O I
10.1109/TPEL.2014.2333004
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
Cascaded multilevel converter structure can be appealing for high-power solar photovoltaic (PV) systems thanks to its modularity, scalability, and distributed maximum power point tracking (MPPT). However, the power mismatch from cascaded individual PV converter modules can bring in voltage and system operation issues. This paper addresses these issues, explores the effects of reactive power compensation and optimization on system reliability and power quality, and proposes coordinated active and reactive power distribution to mitigate this issue. A vector method is first developed to illustrate the principle of power distribution. Accordingly, the relationship between power and voltage is analyzed with a wide operation range. Then, an optimized reactive power compensation algorithm (RPCA) is proposed to improve the system operation stability and reliability, and facilitate MPPT implementation for each converter module simultaneously. Furthermore, a comprehensive control system with the RPCA is designed to achieve effective power distribution and dynamic voltage regulation. Simulation and experimental results are presented to demonstrate the effectiveness of the proposed reactive power compensation approach in grid-interactive cascaded PV systems.
引用
收藏
页码:188 / 202
页数:15
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