| 引用本文: | 于飞,朱瑞峰,刘喜梅.阶调式模块化多电平变换器的研究及应用[J].电力系统保护与控制,2019,47(22):27-34. |
| YU Fei,ZHU Ruifeng,LIU Ximei.Research on gradationally controlled modular multilevel converter and its application[J].Power System Protection and Control,2019,47(22):27-34 |
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| 摘要: |
| 随着模块化多电平变换器 (Modular Multilevel Converter, MMC) 桥臂中串联的子模块个数增多，硬件成本升高，制约了其在光伏并网发电系统的发展。针对这一问题，通过分析阶调式多电平逆变器的工作原理和控制策略，提出了阶调式模块化多电平变换器 (Gradationally Controlled Modular Multilevel Converter, GC-MMC)，并将其应用于光伏并网发电系统中。此外，为了解决电容电压平衡控制问题，提出了一种适用于GC-MMC的电容电压平衡控制算法。最后在 Matlab/Simulink 环境下搭建了基于GC-MMC的光伏并网发电仿真系统，并分别与基于VSC和MMC的光伏并网发电系统进行比较。仿真结果表明，在相同条件下，GC-MMC输出电平数比MMC更多，并且基于GC-MMC的光伏并网发电系统无需滤波环节，有效降低了系统硬件成本。 |
| 关键词: 模块化多电平变换器 阶调式多电平逆变器 阶调式模块化多电平变换器 电容电压平衡控制算法 光伏并网发电系统 |
| DOI：10.19783/j.cnki.pspc.181611 |
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| 基金项目:国家自然科学基金项目资助(61803219) |
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| Research on gradationally controlled modular multilevel converter and its application |
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YU Fei,ZHU Ruifeng,LIU Ximei
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(College of Automation & Electric Engineering, Qingdao University of Science & Technology, Qingdao 266061, China)
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| Abstract: |
| As the number of sub-modules (SM) connected in series in one arm increases, the hardware cost of Modular Multilevel Converter (MMC) rises. It limits the development of MMC applied in the grid-connected PV system. To solve this problem, a Gradationally Controlled Modular Multilevel Converter (GC-MMC) is proposed and applied to the grid-connected PV system through analyzing the working principle and control strategy of gradationally controlled multi-level inverters. Aiming at the problem about controlling the voltage of capacitors, a capacitor voltage balancing controlled algorithm for GC-MMC is proposed. A grid-connected PV system based on GC-MMC is built with Matlab/Simulink. Compared with systems based on VSC and MMC, the simulation results show that the number of levels output by GC-MMC is higher than that of MMC. The filter is not needed by the grid-connected PV system based on GC-MMC, which reduces the hardware cost effectively. This work is supported by National Natural Science Foundation of China (No. 61803219). |
| Key words: MMC gradationally controlled multi-level inverter GC-MMC capacitor voltage balancing controlled algorithm grid-connected PV system |
