变压器与柴油发电机混合供电系统阻抗建模分析

Impedance Modeling and Analysis of Hybrid Power Supply System with Transformer and Diesel Generator

现有阻抗建模分析结果与实际曲线之间的拟合度较低,难以满足混合供电系统工作需求,因此提出变压器与柴油发电机混合供电系统阻抗建模分析。分析变压器与柴油发电机等主要发电设备工作特点和混合供电系统的工作原理;考虑到坐标旋转变换过程、端口阻抗以及恒功率负载多种影响因素,建立稳定性较高的变压器与柴油发电机混合供电系统阻抗模型;通过在线测量电网阻抗值,动态调整锁相环(PLL)的控制参数,在奈奎斯特曲线图的作用下,输出变压器与柴油发电机混合供电系统阻抗特性分析结果。实例测试结果表明,正序阻抗分析结果下,所提出方法得出的阻抗特性拟合度分别提升了20%、30%,负序阻抗分析结果的拟合度分别提升了11%、13%。

The fitting between the existing impedance modeling analysis results and the actual curve is difficult to meet the working needs of the hybrid power supply system. Therefore, the impedance modeling analysis of the hybrid power supply system of transformer and diesel generator is proposed. The working characteristics of major power generation equipment such as transformer and diesel generator are analyzed and the working principle of the hybrid power supply system is discussed. In consideration of the process of coordinate rotation transformation, port impedance and constant power load, the impedance model of the hybrid power supply system of transformer and diesel generator is established. The power system impedance is measured online, the control parameters of phase locked loop(PLL) are adjusted, and the impedance of the model under the Nyquist curve is output. The test results of the model show that using the proposed method, the degress of fitting of the impedance properties are increased by 20% and 30%, respectively, for the positive order impedance, and increased by 11% and 13%, respectively, for the negative order impedance.