Abstract
With the integration of distributed renewable energy to the distribution network and the development of multiterminal flexible DC transmission technology, multiterminal flexible DC distribution network has broad application prospects. At the same time, with the rapid development of new energy vehicles, the echelon utilization of power battery has become a research hotspot. By analyzing the characteristics of flexible DC distribution network and echelon utilization battery, the structure and control strategy of modular multilevel converter (MMC), DC solid-state transformer, photovoltaic power generation, wind power generation, and echelon utilization battery energy storage system are established, respectively, in this paper. To achieve a DC network connection of various types of power supply and load, this paper proposes a starting method of multiterminal flexible DC distribution network and a cooperative control strategy of the wind-solar-storage system. A six-terminal ring-shape DC distribution network model is built in real-time digital simulation (RTDS) platform. The simulation results show that the modeling methods and control strategies of each component in the real-time simulation model meet the operation requirements of the multiterminal flexible DC distribution network, which provides a reference for the construction and research of the flexible DC distribution network.
Highlights
With the development of renewable energy technology and energy storage technology, modern distribution network will contain more and more distributed power and energy storage. e common distributed power sources include photovoltaic cells, fuel cells, wind turbines, and gas turbines, and the power generated by these power sources is DC or can be converted into DC after simple rectification
Modeling of Components in Flexible DC Distribution System e multiterminal flexible DC distribution system is mainly composed of converter, DC transformer, distributed power supply, and DC load
real-time digital simulation (RTDS) has an modular multilevel converter (MMC) valve model based on FPGA, which is conducive to simulate the MMC valve with a large number of switching elements and the internal pressure balancing problem of the analog valve
Summary
With the development of renewable energy technology and energy storage technology, modern distribution network will contain more and more distributed power and energy storage. e common distributed power sources include photovoltaic cells, fuel cells, wind turbines, and gas turbines, and the power generated by these power sources is DC or can be converted into DC after simple rectification. 2. Modeling of Components in Flexible DC Distribution System e multiterminal flexible DC distribution system is mainly composed of converter, DC transformer, distributed power supply (such as photovoltaic power generation system, wind power generation system, and energy storage device), and DC load. DC solid-state transformer (DCSST) based on power electronics technology can realize the matching of different voltage levels in DC distribution network. In order to make full use of solar energy, it is necessary to make the working point of the photovoltaic cell fall to the maximum power point, that is, maximum power point tracking (MPPT) control under the circumstances of light intensity and temperature change [15].
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