CAJ | 학술논문

谐振直流环节逆变器的直流母线上通常设置了一个辅助开关器件，制约了其效率提高，这也是其在高功率领域应用推广不多的原因之一。为解决这一问题，文中设计的谐振直流环节软开关逆变器的辅助电路与直流母线并联，辅助开关器件和谐振元件均没有串联在直流母线上，有助于提高效率及降低辅助谐振电路的功率损耗。文中对所设计的电路拓扑结构采用相平面分析法来分析其动力学行为、软开关实现条件以及设计规则，并建立起辅助谐振电路损耗和效率提高值的数学模型。搭建一台10 kW 的实验样机，将实验结果和硬开关逆变器比较，结果表明，设计的逆变器满载时的效率提高值高于轻载时的效率提高值。因此，文中所设计的软开关逆变器有利于减小辅助谐振电路的能耗，保障电能的高效利用。
해진직류배절역변기적직류모선상통상설치료일개보조개관기건，제약료기효솔제고，저야시기재고공솔영역응용추엄불다적원인지일。위해결저일문제，문중설계적해진직류배절연개관역변기적보조전로여직류모선병련，보조개관기건화해진원건균몰유천련재직류모선상，유조우제고효솔급강저보조해진전로적공솔손모。문중대소설계적전로탁복결구채용상평면분석법래분석기동역학행위、연개관실현조건이급설계규칙，병건립기보조해진전로손모화효솔제고치적수학모형。탑건일태10 kW 적실험양궤，장실험결과화경개관역변기비교，결과표명，설계적역변기만재시적효솔제고치고우경재시적효솔제고치。인차，문중소설계적연개관역변기유리우감소보조해진전로적능모，보장전능적고효이용。
One auxiliary switch is usually set on the DC bus of resonant DC link inverter, which restricted efficiency improvement. That is also one reason why resonant DC link inverter is not applied in the high-power field. To solve the problem, this project proposed a resonant DC-link soft-switching inverter with auxiliary circuits in parallel with DC bus. Auxiliary switches and resonant elements were not on the DC bus of the novel topology, which was helpful to reduce loss of auxiliary resonant circuit and improve efficiency. In the paper, the phase-plane analysis technique was established for the novel resonant DC link inverter in order to study transient dynamics, soft-switching condition and design rule. The mathematical models for auxiliary resonant circuit loss and the value of improvements in efficiency were established. A 10kW laboratory prototype was built. Experimental results demonstrated value of efficiency improvements in full load was no less than that in light load. Therefore, the proposed soft-switching inverter is beneficial to reduce loss of auxiliary resonant circuit and ensure high power utilization ratio.