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逆变器并联的自适应滑模全局鲁棒电压控制方法

DOI: 10.13334/j.0258-8013.pcsee.2015.13.010, PP. 3272-3281

Keywords: 并联逆变器,孤岛模式,参数摄动,自适应预测,滑模控制器,全局鲁棒性,抖振抑制

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Abstract:

针对孤岛微电网非线性负载产生的谐波电流扰动和逆变器滤波参数摄动,使得经典的比例-积分-微分电压控制器难以实现对逆变器满足精度的控制,文中设计一种自适应滑模全局鲁棒电压控制器。该控制器对逆变系统负载电流扰动和滤波参数摄动采取自适应预测,使得控制系统具备全局鲁棒性。另外,负载电流扰动的自适应预测,在保证控制系统稳定性前提下,能够实时调节输入电压控制信号的切换增益,从而限制了输出电压的抖振。仿真和实验结果表明:该策略降低了逆变系统输出电压的抖振、谐波畸变率、稳态跟踪误差以及并联逆变器之间的环流,提高了逆变系统输出电压的动态调节能力及抵御滤波参数摄动的能力。

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