用于微电网无功均衡控制的虚拟阻抗优化方法
发布时间：2018-08-17 16:56
【摘要】：受微电网线路阻抗不匹配等因素影响,传统下垂控制常存在无功均衡问题。应用虚拟阻抗方法可以抑制无功均衡误差。然而,传统虚拟阻抗方法没有充分考虑微电网网络中的不匹配因素。为了提高无功均衡准确度,提出了一种基于微电网全局无功均衡误差最小化思想的虚拟阻抗优化方法。通过微电网网络建模,推导了网络无功均衡误差估算方法。然后,基于无功传输特性设计了自适应虚拟阻抗控制器。在此基础上,构建全局无功均衡误差计算函数并优化,以获得最优控制器参数。该方法实施无需通讯,可在结构复杂的微电网中应用。相比传统虚拟阻抗方法,优化后的虚拟阻抗控制具有网络自适应能力,且无功均衡性能更为良好。仿真和实验结果均验证了所提方法的有效性。
[Abstract]:Under the influence of line impedance mismatch and other factors, the traditional droop control often exists reactive power equalization problem. The reactive power equalization error can be suppressed by using the virtual impedance method. However, the traditional virtual impedance method does not fully take into account the mismatch factors in microgrid networks. In order to improve the accuracy of reactive power equalization, a virtual impedance optimization method based on minimization of global reactive power equalization error is proposed. The estimation method of reactive power equalization error is derived by modeling microgrid network. Then, an adaptive virtual impedance controller is designed based on reactive power transmission characteristics. On this basis, the global reactive power equalization error calculation function is constructed and optimized to obtain the optimal controller parameters. This method can be used in complex microgrid without communication. Compared with the traditional virtual impedance method, the optimized virtual impedance control has the adaptive capability of the network and the better performance of reactive power equalization. The effectiveness of the proposed method is verified by both simulation and experimental results.
【作者单位】： 西安交通大学电气工程学院;
【基金】：国家自然科学基金项目(51177130,51407133)~~
【分类号】：TM727
[Abstract]:Under the influence of line impedance mismatch and other factors, the traditional droop control often exists reactive power equalization problem. The reactive power equalization error can be suppressed by using the virtual impedance method. However, the traditional virtual impedance method does not fully take into account the mismatch factors in microgrid networks. In order to improve the accuracy of reactive power equalization, a virtual impedance optimization method based on minimization of global reactive power equalization error is proposed. The estimation method of reactive power equalization error is derived by modeling microgrid network. Then, an adaptive virtual impedance controller is designed based on reactive power transmission characteristics. On this basis, the global reactive power equalization error calculation function is constructed and optimized to obtain the optimal controller parameters. This method can be used in complex microgrid without communication. Compared with the traditional virtual impedance method, the optimized virtual impedance control has the adaptive capability of the network and the better performance of reactive power equalization. The effectiveness of the proposed method is verified by both simulation and experimental results.
【作者单位】： 西安交通大学电气工程学院;
【基金】：国家自然科学基金项目(51177130,51407133)~~
【分类号】：TM727
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