三相双Buck逆变器过零畸变问题与解决方法

发布时间：2018-07-07 17:24

本文选题：双Buck逆变器 + 半周期控制　；参考：《中国电机工程学报》2014年09期

【摘要】：双Buck拓扑克服了传统桥式拓扑上下桥臂的直通问题,将其应用于三相并网逆变器,能够避免驱动信号死区引入的低次谐波,从而降低进网电流谐波含量,且外接快恢复二极管续流,减小了反向恢复损耗。然而,为消除电感的偏置电流以及提高逆变器效率,双Buck逆变器需采用半周期控制策略,导致了进网电流的过零畸变。针对带LCL滤波器的三相双Buck逆变器,分析半周期控制所导致过零畸变的原因,提出带纹波电流负反馈的半周期空间矢量脉宽调制(space vector pulse width modulation,SVPWM)控制方法,通过在过零点处改变空间电压矢量的基准,有效地消除了进网电流过零畸变,并讨论新型控制算法对系统稳定性的影响,通过仿真和实验验证理论分析。
[Abstract]:The double Buck topology overcomes the pass-through problem of the upper and lower arms of the traditional bridge topology, and applies it to the three-phase grid-connected inverter, which can avoid the low-order harmonics introduced by the dead time of the driving signal, and thus reduce the harmonic content of the incoming current. And the external fast recovery diode stream reduces the reverse recovery loss. However, in order to eliminate the bias current of the inductor and improve the efficiency of the inverter, a half-period control strategy is required for the dual-Buck inverter, which leads to the zero-crossing distortion of the current entering the grid. For the three-phase double-Buck inverter with LCL filter, the reason of zero-crossing distortion caused by half-period control is analyzed, and a half-period space vector pulse width modulation (space vector pulse width) control method with negative ripple current feedback is proposed. By changing the reference of space voltage vector at zero crossing point, the zero-crossing distortion of entering grid current is effectively eliminated, and the influence of new control algorithm on system stability is discussed. The theoretical analysis is verified by simulation and experiment.
【作者单位】：江苏省新能源发电与电能变换重点实验室(南京航空航天大学);
【基金】：国家自然基金项目(51377082) 省产学研联合创新资金——前瞻性联合研究项目(BY2012021) 江苏省优势学科建设项目普通高校研究生科研创新计划资助项目(CXZZ12_0151)~~
【分类号】：TM464

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