CAJ | 학술논문

提出了基于耦合电感单级升压逆变器的光伏并网发电系统，其可在一级变换器中实现升压、逆变、单位功率因数并网和最大功率跟踪(maximum power point tracking，MPPT)的功能。该拓扑在电压源和三相逆变桥间加入包含耦合电感的无源网络，通过调节桥臂的直通占空比和耦合电感的匝比，实现母线电压的提升。由于桥臂直通成为一种正常工作方式，系统的可靠性得到了提高。此外，采用单级逆变器和通过采样输出电流实现 MPPT 的方式简化了系统，降低了成本且易于实现。算例结果验证了该方法的可行性。
제출료기우우합전감단급승압역변기적광복병망발전계통，기가재일급변환기중실현승압、역변、단위공솔인수병망화최대공솔근종(maximum power point tracking，MPPT)적공능。해탁복재전압원화삼상역변교간가입포함우합전감적무원망락，통과조절교비적직통점공비화우합전감적잡비，실현모선전압적제승。유우교비직통성위일충정상공작방식，계통적가고성득도료제고。차외，채용단급역변기화통과채양수출전류실현 MPPT 적방식간화료계통，강저료성본차역우실현。산례결과험증료해방법적가행성。
A grid-connected photovoltaic (PV) generation system based on single-stage voltage step-up inverter with coupled inductor, which can implement the functions of voltage step-up, DC-to-AC inversion, grid-connection under unity power factor and maximum power point tracking (MPPT) by a single-stage inverter, is proposed. A passive network containing coupled inductor is added-in between voltage-source and three-phase inverter bridge and by means of adjusting duty ratio of shoot-through zero vector and turns ratio of inductor, the bus voltage step-up can be implemented. Because the shoot-through of bridge arm becomes a normal operation mode, the reliability of PV generation system can be improved, in addition, the PV generation system is simplified as a result of utilizing singe-stage inverter and MPPT is implemented by sampling output current, thus the PV generation system is easily realized and its cost is reduced. The feasibility of the proposed method is verified by results of experimental test.