中文摘要：

为改善微电网无功／电压的稳定性，提出一种新型连续无功补偿装置——静止无功补偿磁能再生开关（SVC-MERS），且将其与晶闸管投切电容器（TSC）联合运行，实现微电网分时段多级连续无功控制。首先，对微电网无功不稳定问题进行分析，通过对比当前主流无功补偿装置，论证本方案的优越性；第二，详细介绍SVC-MERS的结构、原理与补偿特性；第三，针对传统相移控制的缺陷，提出基于二自由度的直接电压控制法，另外为提高响应速度，首次提出脉宽调制（PWM）方法，并通过仿真验证两种控制法协调执行的效果；第四，搭建微电网实验平台，研制一套容量为19kvar的TSC＋SVC-MERS装置，完成微电网的连续无功控制实验，实验结果验证了其实际效果。

英文摘要：

A novel continuous reactive power compensation device named Static Var Compensator-Magnetic Energy Recovery Switch （SVC-MERS） was proposed to improve the reactive power/voltage stabilization of the microgrid. Multi- period and multi-level continuous reactive power compensation was realized by using SVC-MERS in collaboration with Thyristor Switched Capacitor （TSC）. Firstly, the instability phenomenon of reactive power in microgrid was analyzed, the superiority of the program was demonstrated by comparing the current mainstream reactive compensation devices. Secondly, the configuration, operating principle and compensation characteristics of SVC-MERS were introduced in detail. Thirdly, Direct Voltage Control （DVC） with two-dimension DOF was proposed based on fault of traditional phase- delay control method. Additionally, in order to improve the response speed, Pulse Width Modulation （PWM） was proposed and applied for the first time. Finally, a test platform of microgrid was set up to develop a 19 kvar TSC＋SVC- MERS device successfully and complete continuous reactive power control experiment of multi-source micro-grid. Actual effect of the new device was verified by the experimental results.