模块化多电平静止无功补偿器控制策略研究

随着多电平逆变器在电力系统无功功率补偿领域的广泛应用，提出了一种基于模块化多电平( MMC)技术的新型静止无功补偿器( STATCOM)的拓扑结构。该拓扑结构具有模块化程度高、可靠性好、便于维护及容量拓展等特点，是一种极具发展潜力的拓扑结构。首先对MMC-STATCOM的工作原理和数学模型进行了分析，提出了无功功率解耦控制策略以及提出了一种新的控制子模块电容电压平衡的控制算法。仿真和测试结果均表明MMC-STATCOM具有补偿效果好，动态响应速度快等优点，是一种具有工程应用价值的大容量STATCOM主电路拓扑。

Research of static synchronous compensator based on modular multilevel converter

As the broad application of multilevel inverters in high-power area, modular multilevel converter (MMC) is proposed in this paper to be used as a static synchronous compensator (STATCOM). This MMC-STATCOM has a high degree of modularity and good reliability, and is convenient for maintenance and capacity extension, which is a typological structure with high development potential. Firstly, this paper explains the operation principle and mathematical model of MMC-STATCOM. Then, a novel reactive power decoupling control strategy and a novel capacitor voltage-balancing control scheme are proposed respectively. the simulation and experiment result show that performance of proposed control strategy and MMC-STATCOM may be a new circuit topology with significant engineering application value in large-capacity reactive power compensation field.