CAJ | 학술논문

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。
병망역변기작위전능궤송전망적중요배절，기공제방식우위중요。제출료일충괄용우교직류쌍향공솔변환기적개진하수공제방식，가재정류、역변급정궤모식간자주절환。공제계통근거직류모선전압치판단계통운행상태，병계동교직류쌍향공솔변환기공작재여계통필배적공작모식，실현직류미전망여대전망적능량교환，동시피면료유우직류모선전압소범위파동인기적전력전자기건빈번동작。방진급실험결과표명，해공제계통가유지직류미전망모선전압재액정치부근소범위파동，보증료미전망계통은정운행，제고료계통가고성。
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.