基于储能物理约束的虚拟同步机运行边界研究

发布时间：2018-03-11 09:00

本文选题：虚拟同步机　切入点：分布式发电　出处：《中国电机工程学报》2017年02期 　论文类型：期刊论文

【摘要】：由于微网中的高渗透率分布式电源无法为系统提供足够的惯量和阻尼,给系统的频率稳定性造成了极大的影响。虚拟同步机可通过控制使分布式电源并网变换器表现同步机的特性,储能是实现虚拟同步机为系统提供惯量和阻尼的物理基础,但储能的容量受限于环境和投资等因素。为获得储能对虚拟同步机系统的物理约束及其运行边界,该文建立虚拟同步机的小信号模型,基于此模型提出储能物理约束的计算方法。通过分析虚拟同步机输出不同无功功率时的动态特性,得到储能约束下的虚拟同步机运行边界。通过对不同惯量和阻尼下虚拟同步机的动态响应特性的分析,获得惯量和阻尼影响物理约束的机理。最后,通过PSCAD/EMTDC中搭建的仿真模型验证理论分析的正确性。
[Abstract]:Because the high permeability distributed power source in the microgrid can not provide enough inertia and damping for the system, The frequency stability of the system is greatly affected by the virtual synchronous machine. The virtual synchronous machine can make the distributed power supply grid-connected converter to express the characteristics of the synchronous machine, and the energy storage is the physical basis to realize the virtual synchronous machine to provide the inertia and damping for the system. However, the capacity of energy storage is limited by environmental and investment factors. In order to obtain the physical constraints of energy storage on virtual synchronous machine system and its operation boundary, a small signal model of virtual synchronous machine is established in this paper. Based on this model, a method for calculating the physical constraints of energy storage is proposed. The dynamic characteristics of the virtual synchronous machine with different reactive power output are analyzed. By analyzing the dynamic response characteristics of virtual synchronous machine under different inertia and damping, the mechanism of inertia and damping affecting physical constraints is obtained. The simulation model built in PSCAD/EMTDC verifies the correctness of the theoretical analysis.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);
【分类号】：TM727;TM712

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