具有低频功率解耦功能的直流变换系统及其控制策略研究
发布时间：2019-01-06 15:11
【摘要】：对于高压直流输电系统中的高压直流变换器,高电压是其设计难点之一,一般采用多模块串并联组合结构来解决高压问题。而直流电压在经多个单相逆变器变换至交流电压或接三相不平衡负载时直流总线将存在低频纹波,从而影响直流侧电能质量。该文研究了ISOP(input-series outputparallel)系统的低频功率解耦控制,通过注入补偿电流抵消纹波电流,实现功率解耦,抑制直流侧的低频纹波波动,显著提高系统电能质量。为了实现低频纹波的精确控制,解耦系统采用多重准比例谐振控制,通过对多个特定频次的谐波电流进行跟踪并且提供相对较低阻抗的通道来释放谐波电流,以补偿直流侧电压波动。最后通过仿真验证了文中所提方案的可行性与优越性。
[Abstract]:High voltage is one of the difficulties in the design of high voltage DC / DC converters in HVDC transmission systems, and the multi-module series-parallel structure is generally used to solve the problem of high voltage. When DC voltage is converted to AC voltage or three-phase unbalanced load by several single-phase inverters, the DC bus will have low frequency ripple, which will affect the power quality of DC side. In this paper, the low frequency power decoupling control of ISOP (input-series outputparallel) system is studied. The power decoupling is realized by injecting compensation current to cancel the ripple current, and the low frequency ripple fluctuation on the DC side is restrained, and the power quality of the system is improved significantly. In order to control the low frequency ripple accurately, the decoupling system adopts multiple quasi proportional resonance control, which releases harmonic current by tracking the harmonic current of several specific frequencies and providing a channel with relatively low impedance. To compensate for DC side voltage fluctuations. Finally, the feasibility and superiority of the proposed scheme are verified by simulation.
【作者单位】： 国家电能变换与控制工程技术研究中心(湖南大学);株洲中车时代电气股份有限公司;
【基金】：国家自然科学基金项目(51677063)~~
【分类号】：TM46
本文编号：2402960
[Abstract]:High voltage is one of the difficulties in the design of high voltage DC / DC converters in HVDC transmission systems, and the multi-module series-parallel structure is generally used to solve the problem of high voltage. When DC voltage is converted to AC voltage or three-phase unbalanced load by several single-phase inverters, the DC bus will have low frequency ripple, which will affect the power quality of DC side. In this paper, the low frequency power decoupling control of ISOP (input-series outputparallel) system is studied. The power decoupling is realized by injecting compensation current to cancel the ripple current, and the low frequency ripple fluctuation on the DC side is restrained, and the power quality of the system is improved significantly. In order to control the low frequency ripple accurately, the decoupling system adopts multiple quasi proportional resonance control, which releases harmonic current by tracking the harmonic current of several specific frequencies and providing a channel with relatively low impedance. To compensate for DC side voltage fluctuations. Finally, the feasibility and superiority of the proposed scheme are verified by simulation.
【作者单位】： 国家电能变换与控制工程技术研究中心(湖南大学);株洲中车时代电气股份有限公司;
【基金】：国家自然科学基金项目(51677063)~~
【分类号】：TM46
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