考虑非计划孤岛的分布式电源无缝切换控制策略
发布时间：2018-09-05 19:45
【摘要】：为提高本地负载的供电安全,分布式发电(DG)并网逆变器需要工作在并网和离网两种状态,且能无缝切换。提出一种综合的DG无缝控制策略。针对非计划孤岛DG从并网切换离网状态存在失控区域,易引起本地负载电压和频率越限问题,提出采用P-σ、Q-v解耦的非线性控制,实现失控期间的直接电压限幅;提出结合锁频环和去除积分前向通道的锁相环,在不影响锁相环动态特性基础上,实现失控区域的频率限幅。另外,在该控制结构基础上提出一种虚拟并网的预同步方法,避免并网开关闭合时内外环失配,改善并网过渡过程。基于RT-LAB的硬件在环仿真验证了该策略的有效性。
[Abstract]:In order to improve the security of local load, distributed generation (DG) grid-connected inverters need to work in both grid-connected and off-grid states, and can switch seamlessly. A comprehensive DG seamless control strategy is proposed. In view of the out-of-control region of unplanned island DG switching from grid-connected state to off-grid state, it is easy to cause the local load voltage and frequency to overrun. A P- 蟽 Q-v decoupling nonlinear control is proposed to realize the direct voltage limit during the out-of-control period. A novel phase-locked loop (PLL) which combines frequency locking loop with removing integral forward channel is proposed to realize the frequency limit of out-of-control region without affecting the dynamic characteristics of PLL. In addition, on the basis of the control structure, a presynchronization method of virtual grid-connection is proposed to avoid the mismatch between the inner and outer loops when the grid-connected switch is closed, and to improve the transition process of grid-connected. The hardware in-loop simulation based on RT-LAB verifies the effectiveness of the strategy.
【作者单位】： 东北电力大学电气工程学院;
【基金】：国家重点基础研究发展计划(973计划)(2013CB228201) 国家自然科学基金(51277024)资助项目
【分类号】：TM464
本文编号：2225281
[Abstract]:In order to improve the security of local load, distributed generation (DG) grid-connected inverters need to work in both grid-connected and off-grid states, and can switch seamlessly. A comprehensive DG seamless control strategy is proposed. In view of the out-of-control region of unplanned island DG switching from grid-connected state to off-grid state, it is easy to cause the local load voltage and frequency to overrun. A P- 蟽 Q-v decoupling nonlinear control is proposed to realize the direct voltage limit during the out-of-control period. A novel phase-locked loop (PLL) which combines frequency locking loop with removing integral forward channel is proposed to realize the frequency limit of out-of-control region without affecting the dynamic characteristics of PLL. In addition, on the basis of the control structure, a presynchronization method of virtual grid-connection is proposed to avoid the mismatch between the inner and outer loops when the grid-connected switch is closed, and to improve the transition process of grid-connected. The hardware in-loop simulation based on RT-LAB verifies the effectiveness of the strategy.
【作者单位】： 东北电力大学电气工程学院;
【基金】：国家重点基础研究发展计划(973计划)(2013CB228201) 国家自然科学基金(51277024)资助项目
【分类号】：TM464
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