孤岛下交直流混合微电网的VSG控制策略  

VSG control strategy of AC-DC hybrid microgrid under isolated island

作　　者：薛易 张帅 陈元 Xue Yi;Zhang Shuai;Chen Yuan(School of Electrical & Control Engineering, Heilongjiang University of Science & Technology, Harbin 150022, China)

机构地区：[1]黑龙江科技大学电气与控制工程学院,哈尔滨150022

出　　处：《黑龙江科技大学学报》2021年第4期481-486,共6页Journal of Heilongjiang University of Science And Technology

摘　　要：针对交直流混合微电网频率和电压易突变、缺少惯性等问题,提出了包括双向功率变换器的VSG控制、交流子网的VSG控制和直流子网的多层VSG控制策略。通过混合微网瞬时有功的平衡性为交流频率和直流母线电压提供惯量支持,改进适用于功率变换器的VSG控制策略,采用常规的VSG控制交流子网逆变器,将虚拟惯量和阻尼系数引入直流子网DC-DC变换器中,实现DC-DC变流器的虚拟惯性控制,增大了直流母线电压的惯性来源。结果表明:在逆变模式下,交流频率和直流母线电压的波动分别为0.2 Hz和1 V;在整流模式下,交流频率和直流母线电压的波动分别为0.1 Hz和1 V。交流频率和直流电压抗扰动性明显增强,证明了所提控制策略的有效性。This paper aims to address the problems affecting frequency and voltage mutation and lack of inertia in AC-DC hybrid microgrid and proposes a VSG control strategy including bidirectional power converter,VSG control in AC subnet and multi-layer VSG control in DC subnet.The study based on the insight that the instantaneous active power balance of hybrid microgrid provides inertia support for AC frequency and DC bus voltage involves improving VSG control strategy for power converters;controlling AC sub grid inverter using conventional VSG;introducing virtual inertia and damping coefficient into DC-DC converter of DC subnet;realizing virtual inertia control of DC-DC converter;and increasing the inertia source of DC bus voltage.The results show that in the inverter mode,the fluctuation of AC frequency and DC bus voltage is 0.2 Hz and 1 V respectively.The fluctuation of AC frequency and DC bus voltage in rectified mode is 0.1 Hz and 1 V,respectively.The anti-disturbance performance of AC frequency and DC voltage is obviously enhanced,which proves the effectiveness of the proposed control strategy.

关 键 词：交直流混合微电网 虚拟同步电机控制 交流频率 直流电压 

分 类 号：TM732[电气工程—电力系统及自动化]