基于虚拟同步电机的交直流混合微电网控制策略

发布时间：2018-03-15 01:01

本文选题：虚拟同步电机　切入点：混合微电网　出处：《中国电机工程学报》2017年02期 　论文类型：期刊论文

【摘要】：交直流混合微电网中,由一台或多台联络换流器(interfacing converter,IFC)实现交、直流网络之间的能量传递,分布式电源的效率以及系统的稳定性很大程度取决于IFC的控制策略。传统基于电压环、电流环结构的IFC控制策略存在弱电网下稳定性差、需要交流电源提供参考正弦电压等问题。针对这些问题,该文利用直流网络电压与虚拟转速归一化后的差值作为虚拟机械力矩,提出一种基于虚拟同步发电机技术的IFC控制策略。通过建立其小信号模型来证明所提控制策略的稳定性对参数的选取不敏感,有较强的鲁棒性。最后,利用PSCAD/EMTDC在孤岛情况下对所提算法进行测试,测试结果表明,所提算法能有效改善被动孤岛过程中的动态性能,同时能较好地实现交、直流电源输出功率分配以及联络换流器之间的均流。
[Abstract]:In a hybrid AC / DC microgrid, AC is implemented by one or more contact converters. The energy transfer between DC networks, the efficiency of distributed generation and the stability of the system depend to a great extent on the control strategy of IFC. The IFC control strategy with current loop structure has some problems such as poor stability under the weak current network and the need for AC power supply to provide reference sinusoidal voltage. In this paper, the difference between DC network voltage and virtual rotational speed is used as virtual mechanical torque. This paper presents a IFC control strategy based on virtual synchronous generator technology. By establishing its small signal model, the stability of the proposed control strategy is insensitive to the selection of parameters and has strong robustness. The test results show that the proposed algorithm can effectively improve the dynamic performance of the passive islanding process, and can also achieve better intersecting with the proposed algorithm in the case of isolated islands by using PSCAD/EMTDC, and the test results show that the proposed algorithm can effectively improve the dynamic performance in the process of passive islanding. DC power output power distribution and current sharing between the contact converters.
【作者单位】：河海大学能源与电气学院;国电南瑞科技股份有限公司;
【基金】：国家自然科学基金项目(51277052) 国家电网公司科研项目(524608160036) 中央高校基本科研业务费专项资金(2016B20914)~~
【分类号】：TM727

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