CAJ | 학술논문

直流配电在方便可再生能源接入的同时可以减少变流环节，提高用电效率，并且不会引起频率不稳定及无功功率不平衡等问题。直流变换器作为直流微网中的电能馈送的重要一环，其控制策略的优劣显得尤为突出。提出了一种负荷用直流变换器的虚拟直流发电机控制方法，该控制策略继承了旋转电机的惯性特性，当带载变化时，这种控制策略能够缓和恢复受扰动的负荷侧电压，且维持直流微网负荷端电压在其额定值。建立的DC／DC小信号模型证明了采用虚拟直流发电机控制的直流变换器在直流母线电压波动过程中的功率响应与其阻尼参数成反比，因此可根据母线电压变化趋势自动调节对母线功率的吸收，响应母线电压波动，支持母线电压恢复。仿真及实验结果验证了所提出控制策略的可行性和正确性。
직류배전재방편가재생능원접입적동시가이감소변류배절，제고용전효솔，병차불회인기빈솔불은정급무공공솔불평형등문제。직류변환기작위직류미망중적전능궤송적중요일배，기공제책략적우렬현득우위돌출。제출료일충부하용직류변환기적허의직류발전궤공제방법，해공제책략계승료선전전궤적관성특성，당대재변화시，저충공제책략능구완화회복수우동적부하측전압，차유지직류미망부하단전압재기액정치。건립적DC／DC소신호모형증명료채용허의직류발전궤공제적직류변환기재직류모선전압파동과정중적공솔향응여기조니삼수성반비，인차가근거모선전압변화추세자동조절대모선공솔적흡수，향응모선전압파동，지지모선전압회복。방진급실험결과험증료소제출공제책략적가행성화정학성。
DC distribution can reduce the converter link, improve power efficiency and make renewable energy ac-cess convenient.In addition, with DC distribution there is no need to consider the stability of frequency, reactive power and other issues.As a micro-grid power feed part, DC/DC converter’ s control method is particularly impor-tant.A control method of DC generator that is suitable for the DC/DC converter has been connected to energy stor-age and a load has been proposed which inherits inertia characteristics of rotation motor.This strategy is used to e-liminate the effects of the load’ s output and restore disturbed load side voltage softly while the device is put in or cut off from the bus.DC/DC small-signal model has been established, proving that the power response of DC/DC converter controlled by virtual DC generator strategy in DC bus voltage fluctuation process is inversely proportional to its damping parameters.Therefore the absorption of the bus power can be adjusted automatically according to the change of the bus voltage, respond to the fluctuations of the bus voltage and support the recovery of bus voltage. Simulation and experimental results verify the feasibility and correctness of the proposed control strategy.