研究目的
To describe the construction and working principle of a VSC-HVDC power transmission and distribution system based on photovoltaic power generation, focusing on the Zhangbei Xiaoertai Flexible Substation Project, and to propose the necessity of multi-terminal flexible DC transmission technology.
研究成果
VSC-HVDC technology enables efficient consumption of new energy by leveraging the natural DC properties of photovoltaic power generation, reducing energy losses and simplifying power system structures. The Zhangbei Flexible Substation demonstrates successful local consumption and grid connection, and multi-terminal flexible HVDC transmission can enhance power supply stability, provide high-quality energy for important loads, and address new energy consumption challenges.
研究不足
The paper does not explicitly discuss limitations, but based on the content, potential constraints include the focus on a specific case study (Zhangbei project), which may limit generalizability; the complexity and cost of implementing multi-terminal systems; and the need for further validation of control strategies and efficiency in varied conditions.
1：Experimental Design and Method Selection:
The paper describes the system configuration and working principle of a flexible DC transmission and distribution system based on photovoltaic power stations, including the use of VSC-HVDC technology, power electronic transformers (PET), and DC/AC converters. Theoretical models and algorithms are not detailed, but the design rationale is based on reducing energy losses and simplifying the power system structure.
2：Sample Selection and Data Sources:
The study focuses on the Zhangbei Xiaoertai Flexible Substation in China, which connects an Alibaba data center with a photovoltaic power plant. The photovoltaic power station has a generating power of 2.5MW, and the system includes components like BOOST circuits, DC transformers, and super capacitors.
3：5MW, and the system includes components like BOOST circuits, DC transformers, and super capacitors.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes photovoltaic power stations, BOOST circuits with MPPT mode, full-bridge DC transformers, flexible substations, HVDC flexible transmission valves, power electronic transformers (PET), DC/AC converters, super capacitors, and various converters (e.g., AC/DC, DC/DC, DC/AC). Specific models and brands are not provided.
4：Experimental Procedures and Operational Workflow:
The process involves boosting DC voltage from photovoltaic sources (e.g., from 750V to ±10kV using DC transformers), transmitting power to flexible substations, and using PET and converters to manage power flow for AC and DC loads. Control strategies for voltage imbalance and fault detection are mentioned.
5：Data Analysis Methods:
Not explicitly described; the paper provides a descriptive analysis of the system's performance, such as reductions in DC capacitor configuration and energy density improvements, but no statistical or software tools are specified.
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