电气自动化
電氣自動化
전기자동화
ELECTRICAL AUTOMATION
2014年
3期
60-63
,共4页
光伏并网逆变器%无扰切换%不平衡功率单元并联%参数可变调节器%协调控制
光伏併網逆變器%無擾切換%不平衡功率單元併聯%參數可變調節器%協調控製
광복병망역변기%무우절환%불평형공솔단원병련%삼수가변조절기%협조공제
photovoltaic grid-connected inverter%undisturbed switching%paralleling of unbalanced power units%regulator with adjustable parameters%coordinated control
大型光伏电站需要的并网逆变器单机功率越来越大，然而在低功率情况下，单机大功率光伏并网逆变器效率会迅速下降。如何解决在低功率条件下大功率逆变器的效率问题成为一项值得研究的关键技术。提出了一种基于不平衡功率单元并联技术的1MW新型光伏并网逆变器，可有效提高大功率逆变器在低功率条件下的效率和电能质量。详细地叙述了新型逆变器的工作原理，提出了不平衡功率单元无扰切换方法。基于MATLAB仿真模型对无扰切换方法进行了仿真研究，仿真结果表明并网逆变器切换过程中的扰动问题得了到很好的解决。
大型光伏電站需要的併網逆變器單機功率越來越大，然而在低功率情況下，單機大功率光伏併網逆變器效率會迅速下降。如何解決在低功率條件下大功率逆變器的效率問題成為一項值得研究的關鍵技術。提齣瞭一種基于不平衡功率單元併聯技術的1MW新型光伏併網逆變器，可有效提高大功率逆變器在低功率條件下的效率和電能質量。詳細地敘述瞭新型逆變器的工作原理，提齣瞭不平衡功率單元無擾切換方法。基于MATLAB倣真模型對無擾切換方法進行瞭倣真研究，倣真結果錶明併網逆變器切換過程中的擾動問題得瞭到很好的解決。
대형광복전참수요적병망역변기단궤공솔월래월대，연이재저공솔정황하，단궤대공솔광복병망역변기효솔회신속하강。여하해결재저공솔조건하대공솔역변기적효솔문제성위일항치득연구적관건기술。제출료일충기우불평형공솔단원병련기술적1MW신형광복병망역변기，가유효제고대공솔역변기재저공솔조건하적효솔화전능질량。상세지서술료신형역변기적공작원리，제출료불평형공솔단원무우절환방법。기우MATLAB방진모형대무우절환방법진행료방진연구，방진결과표명병망역변기절환과정중적우동문제득료도흔호적해결。
The single unit power of grid-connected inverter required at large-scale photovoltaic power stations keeps increasing,but in the case of low-power,the efficiency of the single-unit photovoltaic grid-connected inverter efficiency declines rapidly.How to solve the problem of the large power converter under low power conditions becomes a key technology worthy of study.A new-type 1 MW photovoltaic grid-connected converter based on the paralleling technology for unbalanced power units is presented to effectively improve the efficiency and electric energy quality under low power conditions.This paper introduces details of the work principle of the new type inverter,and presents an undisturbed switching method between unbalanced power units.Based on the MATLAB simulation model,a simulation study is made of the undisturbed switching method,and the simulation results show that the disturbance in the switching process of the grid-connected inverter is solved in a good way.
