The high-voltage and large-capacity flexible DC converter valve is the core equipment of the DC power grid. Based on the technology of comprehensive optimization method of multiple physical fields, IGBT digital drive technology, voltage balance and loss balance control method, collaborative control technology for key equipment of DC power grid and fault ride through strategy, the converter valve solves the key power grid problems such as DC networking and new energy access in China. The whole valve tower adopts an encircling double row multi-section supporting design, which has flexible mode and free combination. It can meet the requirements of different voltage levels and capacities. The power components and control components are arranged in zones, which solve strong electromagnetic interference problems. The product is surrounded by a rectangular package with metal drawing rounded corners, which improves the quality. Meanwhile, it reduces the he sense of distance between the valve tower and people and enhance the sense of order in valve tower. The power components adopt modular design and have excellent versatility. It can be installed and disassembled as a whole or individually. The electrical circuits are symmetrical considering the effects of parasitic parameters, which highlights the balance and stability of the product. The whole body of the product is the natural color of aluminum alloy after anodizing, using extruded aluminum profile and die casting molding process, and doing wire drawing treatment on the surface, with the advantages of corrosion resistance and wear resistance.

The valve tower adopts the encircling double-row multi-layer arrangement, which has high integration and small footprint; The method is flexible and the combination is free to meet the requirements of different voltage levels and different capacities. The product is surrounded by metal drawing round rectangular package design, which enhances the sense of order of the valve tower, reduces the distance between the valve tower and people, improves affinity, metal drawing enhances the sense of quality, the electrical circuit considers the influence of parasitic parameters, adopts symmetrical design, highlighting the balance and stability of the product.

It was put into operation in ±535kV Zhangbei Project, ±800kV Kunliulong UHV Hybrid DC Project, Guangdong Power Grid DC Back-to-Back Project and ±800kV Baihetan Project, and won the gold medal of 2022 Contemporary Good Design.

The PCS-8100 high voltage large-capacity flexible DC converter valve with completely independent intellectual property rights has generally reached the international leading level of similar systems, and in a real sense, it has realized that the flexible DC transmission products of domestic enterprises do not rely on and exceed foreign products, and achieved the goal of localization of national major equipment. In essence, it improves the international competitiveness of China's flexible DC transmission key equipment, and provides more safe, reliable, convenient operation and maintenance of high-voltage and large-capacity converter valves and valve control systems for subsequent domestic flexible DC transmission projects.

The project has a total of seven full-time members: Sun Yue, Yu Haibo, Guan Jian, Jiang Bo, Zhang Xiaobo, Zhang Weiwei and Li Wenkai, who are responsible for the design, planning, marketing and structure roles respectively.

The flexible DC converter valve will be distributed in various regions of wind power, photovoltaic and other energy sources are connected together, using the complementarity between wind power, photovoltaic and energy storage and other forms of energy, to overcome the intermittency and instability of renewable energy power generation, improve the utilization rate of renewable energy power generation. This product greatly improves the manufacturing level of China in the field of high cutting-edge technology, and essentially improves the international competitiveness of China's flexible DC transmission key equipment.