CAJ | 학술논문

在直流微电网中,变换器是一个极其重要的单元,对其阻抗特性及稳定性研究很关键. 文章基于Boost DC/DC变换器,从电路参数(电感电容等)的角度,在连续导电模式下,根据控制方式的不同对其输出阻抗进行小信号建模,进而理论和实验相结合分析输出阻抗的特性,为制定微电网直流分布系统中变换器的阻抗标准提供了参考依据. 最后搭建的一个级联式DC/DC变换器系统对阻抗比(前级输出阻抗与后级输入阻抗模之比)进行测量,并根据阻抗比稳定性判据对系统的稳定性进行判断. 分析组成级联系统负载级的线路参数对系统稳定性的影响,总结规律与结论,从而对直流微电网进行稳定性分析.
재직류미전망중,변환기시일개겁기중요적단원,대기조항특성급은정성연구흔관건. 문장기우Boost DC/DC변환기,종전로삼수(전감전용등)적각도,재련속도전모식하,근거공제방식적불동대기수출조항진행소신호건모,진이이론화실험상결합분석수출조항적특성,위제정미전망직류분포계통중변환기적조항표준제공료삼고의거. 최후탑건적일개급련식DC/DC변환기계통대조항비(전급수출조항여후급수입조항모지비)진행측량,병근거조항비은정성판거대계통적은정성진행판단. 분석조성급련계통부재급적선로삼수대계통은정성적영향,총결규률여결론,종이대직류미전망진행은정성분석.
In the DC micro grid,the converter is a very important unit and it′s significant to study its impedance char-acteristic and stability.Based on the Boost DC/DC converter, the small signal model in continuous conduction mode is derived by different control modes in respect of circuit parameters (inductance, capacitance et al).And then the output impedance characteristic is analyzed by the combination of math theory and experiments, which provides refer-ence basis for the standard of the converter impedance in distributed system of the micro grid.Finally, a cascade DC/DC converter system was built to measure the impedance ratio ( from the front stage output impedance to the next stage input impedance) .So the stability of the cascade system is judged by the impedance ratio criterion.The influences of the circuit parameters on the system stability were analyzed and the regular pattern and conclusion were summarized to analyze the stability of the DC micro grid.