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三相耦合电感单级升压逆变器非隔离光伏并网发电系统

, PP. 190-199

Keywords: 光伏发电系统,单级逆变器,脉宽调制,直通零矢量

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Abstract:

针对耦合电感单级升压逆变器(CoupledInductorSingle-StageBoostInverter,CL-SSBI)在非隔离光伏并网发电系统中的应用,提出在线路上进行改进,构成CL-SSBI-D,并采用适当的调制方式,减小漏电流幅值。该CL-SSBI-D拓扑,能够在有效矢量和传统零矢量作用时阻断漏电流的回路;采用相邻矢量脉宽调制(Near-StatePWM,NSPWM)方式,去掉传统零矢量,并减小了有效矢量时的共模电压幅值,从而进一步减小了直通零矢量与有效矢量变化瞬间产生的漏电流。本文在理论研究的基础上对采用恒定最大增益(MaximumConstantBoost,MCB)调制方法的CL-SSBI和采用NSPWM调制方法的CL-SSBI-D非隔离并网系统进行了仿真和实验验证,证明采用NSPWM的CL-SSBI-D非隔离并网系统可有效减小漏电流。

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