單周期控制三相PWM整流器在不對稱電網(wǎng)下的研究
作者：占文濤 何禮高 上傳時間：2009/4/28 16:33:51
摘要：傳統(tǒng)的矢量模式單周期控制三相PWM整流器是基于對稱電網(wǎng)系統(tǒng)下研究的，功率因數(shù)約為1，輸入諧波低，且與雙極型單周期控制相比，具有更低的開關(guān)損耗。當(dāng)三相電網(wǎng)不對稱時，三相輸入電流跟蹤電網(wǎng)電壓的非零序分量，采用傳統(tǒng)電網(wǎng)電壓選擇矢量區(qū)間不能保證三相PWM整流器具有較低的開關(guān)損耗，且在電網(wǎng)極端缺相故障時，系統(tǒng)不能正常工作。本文采用電網(wǎng)電壓非零序分量選擇矢量區(qū)間，并對矢量區(qū)間狀態(tài)進行分析比較，結(jié)果證明所采取的方法能保證系統(tǒng)在任何情況下開關(guān)損耗最低。最后對三相PWM整流器工作于不對稱電網(wǎng)情況下進行了仿真研究，仿真結(jié)果表明采用電網(wǎng)電壓非零序分量選擇矢量區(qū)間能保證電網(wǎng)電壓在缺相故障時系統(tǒng)仍能正常工作，并且所采用的單周期控制同時滿足對稱電網(wǎng)系統(tǒng)。
敘詞：單周期控制,不對稱電網(wǎng),三相PWM整流器,非零序分量
Abstract：Research on three-phase PWM rectifier based on traditional vector model one-cycle control (OCC) is in balanced systems, which achieves unity power factor and low THD. And compared with bipolar mode one-cycle control, vector model one-cycle control has minimum switching losses. In unbalanced systems, three-phase input current track the non-zero sequence phase voltages. Selection region based on voltages cant ensure minimum switching losses and handle the extreme unbalanced system where one phase voltage is entirely zero. This paper employs the non-zero sequence phase voltages for region selection, and analyses vector region states, as a result, analysis verify the proposed OCC vector controller can ensure minimum switching losses in the any case. Finally, the simulation results show OCC controller with the non-zero sequence phase voltages for region selection ensure the system reliably work under extreme unbalance conditions, and also satisfy the balanced systems.
Keyword：OCC unbalanced system three-phase PWM rectifier non-zero sequence
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－－本文摘自《電源世界》，已被閱讀2117次
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