六相电励磁同步风电机组的简化动态模型及小扰动稳定研讨.doc

六相电励磁同步风电机组的 摘 要 Six-Phase Electrically Excitation Synchronous Wind Generator，SP-EESWG六相电机发电机，重庆武隆、山东栖霞和内蒙通辽： ①提出了SP-EESWG的简化动态模型。 以该风电机组中风力机、传动系统、六相电励磁同步发电机以及整流-逆变环节等各个组成部分的数学模型为基础，考虑逆变器与电网的接口模型，忽略了整流-逆变环节的开关动态过程和谐波影响，通过选取适当的基值系统，以及对不可控整流桥“有功-无功”稳态运行特性的拟合，建立了SP-EESWG的简化动态模型。在此基础上，推导出了SP-EESWG的稳态模型，解决了动态模型的初值计算问题。以单机无穷大系统为仿真算例，考虑风速的阶跃变化和随机变化两种情况，通过对比分析算例系统的Simulink模型和所提简化动态模型的动态响应，验证了所提模型的性②建立了SP-EESWG小扰动模型。 有关SP-EESWG稳定性的研究尚属空白，本文通过对SP-EESWG简化动态模型线性化处理，建立了SP-EESWG的状态空间模型。在此基础上，基于特征值分析方法，研究风力机机械参数、发电机电气参数、直流电容值和PI控制参数对SP-EESWG小扰动稳定性的影响。结果表明，风力机惯性时间常数和直流电容值对系统稳定性的影响较大，其取值的增大将引起系统整体特征值右移，导致系统稳定性降低；传动轴刚性系数和发电机定子电阻对各个特征值的影响不同，取值过大或过小都会对系统的稳定性产生不利影响；而对于PI控制器而言，比例系数和积分系数对系统稳定性的影响呈相反趋势。 关键词：六相电励磁同步发电机，，，，  Abstract Six-phase electrically excited synchronous wind generator (SP-EESWG) based on the six-phase synchronous generator are a kind of special variable speed constant frequency wind turbine, which has many advantages, such as: low unit cost, high power generation efficiency, small rotational torque pulsation as well as high reliability. And it has been used by some wind farms in Chongqing, Shandong and Neimeng province of China. However, compared with Double-Fed Induction Generator (DFIG) and Direct-Drive Permanent Magnet Synchronous Generators (D-PMSG), the research of SP-EESWG is very limited, relavent studies on SP-EESWGs’ modeling and its dynamic performance are farm from maturity. This paper focuses and make an intensive study on SP-EESWGs’ dynamic model, power flow calculation and small signal stability. the main contents include: A simplified dynamic model of SP-EESWG is presented. Based on the mathematic models of wind turbine, gearbox, generator, AC-DC-AC conversion, a simplified dynamic model is presented ignoring the dynamics and harmonics within rectifying and inverting, choosing the proper basic values and fitting the steady active-reactive power relationship of uncontrollable rectifier. And in order to calculate the initial value for the dynamic