考虑电压母线质量的并联逆变器谐波环流控制

Xuesong Zhou, Xiaojie Liu, Youjie Ma, Xing Zhao
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引用次数: 0

摘要

逆变器并联时会产生较大的谐波环流,根据产生原因的不同可分为负载端和功率端两种。对于负载端产生的谐波环流,将负虚拟谐波阻抗和自适应谐波阻抗相结合。对于其他虚拟谐波阻抗,该策略可以在不影响系统稳定性的前提下,最大限度地降低因添加虚拟阻抗而引起的母线压降和谐波失真率的增加,抑制谐波环流;针对不同死区时间产生的回路电流,采用线性自抗扰控制对死区电压进行估计和补偿,并利用观测器带宽和控制器带宽抑制回路电流。最后,仿真结果验证了所提改进控制策略的正确性和有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Harmonic Circulating Current Control of Parallel Inverter Considering Voltage Bus Quality
The parallel connection of inverters will produce large harmonic circulation, which can be divided into two types according to different causes: load end and power end. For the harmonic circulation generated at the load end, it combines the negative virtual harmonic impedance and adaptive harmonic impedance. For other virtual harmonic impedance, this strategy can minimize the increase of bus voltage drop and harmonic distortion rate caused by adding virtual impedance, and suppress the harmonic circulation without affecting the system stability; For the circulating current generated by different dead time, Linear active disturbance rejection control is used to estimate and compensate the dead time voltage, and the circulating current is suppressed by observer bandwidth and controller bandwidth. Finally, simulation results verify the correctness and effectiveness of the proposed improved control strategy.
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