CAJ | 학술논문

中点钳位(NPC)型中压三电平变流器在兆瓦级风电机组中具有广阔的应用前景。由于变流器容量及电压等级较高，功率器件的损耗是一个不容忽视的问题。文中详细分析了各个功率器件的开关动作与实际电流通路，在此基础上推导了其损耗的实用计算公式，指出了损耗在机侧变流器和网侧变流器之间的不同分布，为变流器的散热设计提供参考，并结合风力发电的特点，研究了功率波动对变流器效率的影响，得出了变流器的效率与功率成正相关的结论。最后，通过MATLAB/Simulink与GH Bladed的联合仿真系统，对分析结果进行了验证。
중점겸위(NPC)형중압삼전평변류기재조와급풍전궤조중구유엄활적응용전경。유우변류기용량급전압등급교고，공솔기건적손모시일개불용홀시적문제。문중상세분석료각개공솔기건적개관동작여실제전류통로，재차기출상추도료기손모적실용계산공식，지출료손모재궤측변류기화망측변류기지간적불동분포，위변류기적산열설계제공삼고，병결합풍력발전적특점，연구료공솔파동대변류기효솔적영향，득출료변류기적효솔여공솔성정상관적결론。최후，통과MATLAB/Simulink여GH Bladed적연합방진계통，대분석결과진행료험증。
The neutral point clamping (NPC) three-level converters have broad application prospects with megawatt wind turbines.The power losses of the switching devices must be considered in such high-power applications.Practical loss-calculating formulas are derived based on the analysis of the conduction and switching principles of the converters.The difference between the motor-side power converter (MPC) and the grid-side power converter (GPC) in power losses distribution is identified.Combined with the characteristics of wind power,the influence of power fluctuation on efficiency is also analyzed.It is concluded that the efficiency has positive correlation with the converted power.Simulation results of a co-simulation platform using MATLAB/Simulink and GH Bladed show the validity of the analysis.