Abstract
The rapid development of renewable energy calls for feasible and reliable technologies to transmit and integrate power into grids. Voltage Source Converter (VSC)- Direct Current (DC) technology is considered as a promising solution for its independent control of active and reactive power. Modeling and coordinated control of a large-scale concentrating photovoltaic integration system with VSC-MVDC (Voltage Source Converter-Medium Voltage Direct Current) technology have been investigated in this paper. The average controlled-source model of PhotoVoltaic (PV) integration system is firstly established. Then, a novel control strategy without fast communication is proposed to improve the reliability of the coordinated control system. An extra voltage loop is added to the basic control block, which is able to assure stable operation of the PV system in various conditions. Finally, the proposed control strategy is verified with simulation results.
Highlights
The combination of Voltage Source Converter (VSC) and Direct Current (DC) transmission technology has attracted the interests of researchers and power grid operators recently
This paper investigates a large-scale concentrating PV system integrated into a power grid with VSC-MVDC (Medium Voltage DC) technology
VSC-MVDC technology is a promising solution for solar energy integration
Summary
The combination of Voltage Source Converter (VSC) and Direct Current (DC) transmission technology has attracted the interests of researchers and power grid operators recently. DC transmission system has lower loss and higher capacity than the Alternating Current (AC) system. As the majority of equipment in existing power grids is AC generators and AC loads, converters are needed among AC and DC system. Another role of converters in DC system is to connect and transmit power between different DC voltage levels, just like transformers in AC system. Current Source Converter (CSC) and VSC are two basic types of converters widely used in AC/DC systems. Thyristor-valves are usually used in CSC, which relies on AC system to achieve commutation
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