Reactive Power Compensation and Optimization Strategy for Grid-Interactive Cascaded Photovoltaic Systems
سال انتشار : 2015
نوع مقاله : IEEE JOURNALS & MAGAZIENS
تعداد صفحات : 15
Abstract – 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 firstly 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 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.
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