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5SHY4045L0001 高压大容量功率半导体器件作为MMC
5SHY4045L0001 在新能源输送和大规模储能的驱动下，直流电网在世界各国的发展势不可挡。高压大容量功率半导体器件作为MMC、直流断路器、直流变压器、直流耗能装置等直流主干网络关键装备的核心元件，是学术研究的前沿话题，也是产业应用的关注热点。IGBT具有驱动功率小而且驱动电路简单、开关速度快、耐压高、电流大等优点，在柔性直流电网中得到了广泛的应用。而事实上，尽管IGBT优势突出，但是相比电流型器件，仍然存在通态压降大、可靠性低、制造成本高等问题，具有很多改进的空间。尤其是在高压大容量应用中，所使用的开关器件数量非常大，若能改进这些特性，进一步提高效率和可靠性、减小成本，将会具有很大的吸引力和应用前景。5SHY4045L0001在突破IGCT器件新技术的同时，研究团队对于IGCT器件在直流电网中的应用前景进行了系统地分析和展望，同步研制了一系列关键设备，并在示范工程及电网试验平台中得到了应用。当前直流电网中的关键设备（如MMC、直流断路器、直流变压器、直流耗能装置等）相对于交流电网中的电力电子设备具有很多新特性，这为IGCT的应用提供了契机。研究团队结合这些关键设备的内在特性，提出了基于IGCT的创新方案，并系统论证了其可行性以及技术经济优势。分析表明，基于IGCT的新型设备在安全防爆、故障处理、转换效率、功率密度、制造成本以及可靠性等方面均具有突出的优势，使其在直流电网中的应用具备巨大的潜力。在2018年12月投运的珠海“互联网+”智慧能源示范工程中，鸡山换流站的10kV/10MW MMC应用了研究团队提出的IGCT交叉钳位方案，这是国产IGCT器件在柔性直流输电换流阀中的首次亮相。现已稳定运行一年多，为IGCT器件特性的研究和改进提供了宝贵的数据和经验。在正在建设中的东莞交直流混合配电网工程中，应用了基于IGCT-Plus研发的±375V固态式直流断路器，实现了国产IGCT-Plus器件在固态式直流断路器中的首次应用。
5SHY4045L0001 高压大容量功率半导体器件作为MMC
Driven by new energy transmission and large-scale energy storage, the development of DC power grids in countries around the world is unstoppable. As the core components of key equipment of DC backbone network such as MMC, DC circuit breaker, DC transformer and DC energy consuming device, high-voltage and large-capacity power semiconductor device is the frontier topic of academic research and the focus of industrial application. IGBT has the advantages of low driving power, simple driving circuit, fast switching speed, high voltage and high current, and has been widely used in the flexible DC power grid. In fact, despite the outstanding advantages of IGBT, compared with current-type devices, there are still problems such as large on-state voltage drop, low reliability and high manufacturing cost, and there is a lot of room for improvement. Especially in high-voltage large-capacity applications, the number of switching devices used is very large, and if these characteristics can be improved to further improve efficiency and reliability, and reduce costs, it will have great attraction and application prospects. 5SHY4045L0001 While breaking through the new technology of IGCT devices, the research team systematically analyzed and forecast the application prospects of IGCT devices in DC power grids, synchronously developed a series of key equipment, and has been applied in demonstration projects and power grid test platforms. The key equipment in the current DC power grid (such as MMC, DC circuit breaker, DC transformer, DC energy-consuming device, etc.) has many new characteristics compared with the power electronic equipment in the AC power grid, which provides an opportunity for the application of IGCT. Combining the intrinsic characteristics of these key devices, the research team proposed an innovative scheme based on IGCT, and systematically demonstrated its feasibility and technical and economic advantages. The analysis shows that the new type of equipment based on IGCT has outstanding advantages in safety and explosion protection, fault handling, conversion efficiency, power density, manufacturing cost and reliability, which makes its application in DC power grid have great potential. In the Zhuhai “Internet +” smart energy demonstration project put into operation in December 2018, the 10kV/10MW MMC of Jishan Converter station applied the IGCT cross-clamping scheme proposed by the research team, which is the first appearance of domestic IGCT devices in the flexible DC transmission converter valve. It has been running stably for more than one year, providing valuable data and experience for the research and improvement of IGCT device characteristics. The ±375V solid-state DC circuit breaker developed based on IGCT-Plus is applied in the AC-DC hybrid power distribution network project under construction in Dongguan, which realizes the first application of domestic IGCT-Plus device in solid-state DC circuit breaker.
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