在不平衡条件下分布式发电的优化分层有功振荡控制
Optimized Hierarchical Power Oscillations Control for Distributed Generation Under Unbalanced Conditions
AI总结：
本文提出分层控制策略以减少不平衡条件下分布式发电的有功和无功振荡，通过双电流控制器和优化模型降低振荡幅度，仿真结果表明该方法能有效限制有功和无功振荡。
摘要：
控制结构对换流器接口分布式发电（DG）在不平衡条件下的性能有关键影响。大多数先前工作聚焦于抑制有功功率振荡和直流母线电压的纹波。本文首先推导了有功功率振荡幅度与无功功率振荡幅度之间的关系，并提出分层控制策略以减少功率振荡。分层控制包括一级和二级控制层次。一级控制生成电流参考值，通过双电流控制器抑制有功功率振荡。二级控制通过优化模型同时减少有功和无功功率振荡，目标是最小化振荡幅度。仿真结果表明，所提出的二级控制方法注入的负序电流比传统控制方法少，能够有效限制有功和无功功率振荡。
英文摘要：
Control structures have critical influences on converter-interfaced distributed generations (DG) under unbalanced conditions. Most of previous works focus on suppressing active power oscillations and ripples of DC bus voltage. In this paper, the relationship between amplitudes of the active power oscillations and the reactive power oscillations are firstly deduced and the hierarchical control of DG is proposed to reduce power oscillations. The hierarchical control consists of primary and secondary levels. Current references are generated in primary control level and the active power oscillations can be suppressed by a dual current controller. Secondary control reduces the active power and reactive power oscillations simultaneously by optimal model aiming for minimum amplitudes of oscillations. Simulation results show that the proposed secondary control with less injecting negative-sequence current than traditional control methods can effectively limit both active power and reactive power oscillations.
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