摘要
并网逆变器作为电能馈送电网的重要环节,其控制方式尤为重要。提出了一种适用于交直流双向功率变换器的改进下垂控制方式,可在整流、逆变及停机模式间自主切换。控制系统根据直流母线电压值判断系统运行状态,并启动交直流双向功率变换器工作在与系统匹配的工作模式,实现直流微电网与大电网的能量交换,同时避免了由于直流母线电压小范围波动引起的电力电子器件频繁动作。仿真及实验结果表明,该控制系统可维持直流微电网母线电压在额定值附近小范围波动,保证了微电网系统稳定运行,提高了系统可靠性。
Interlink-converter is a key part of electricity feeding grid, so its control method is particularly important. This paper presents a new droop control method which can independently switch interlinking work mode between converter and inverter. Control system judges the running state of the system according to DC bus voltage values, starts the interlinking converter and keeps it working in the mode matching the system, thus realizes the energy exchange between DC microgrid and grid while avoiding frequent activation of electric and electronic apparatus caused by fluctuation of DC bus voltage. The simulation and experiment results show that the control system can maintain light fluctuation of DC bus voltage around rating, therefore is feasible to ensure the stable operation of micro grid system and improve the reliability of the system.
出处
《电网技术》
EI
CSCD
北大核心
2014年第2期304-310,共7页
Power System Technology
基金
国家国际科技合作与交流专项(2010DFB63200)~~
