1.25MW双馈异步风力发电系统设计

学号：2013210516

XINJIANG INSTITUTE OF ENGINEERING

毕业设计

设计题目：1.25MW双馈异步风力发电系统设计

学生：××××××

专业：电气工程及其自动化

班级：电气工程13-2

系部：电力工程系

指导教师：××××××

二〇一七年六月七日

摘要

随着一些地区风电供应比例的急剧增加，大规模风电场对地区电网稳定性造成的影响愈发显著。风力发电机的低电压穿越技术越来越受关注。文中首先介绍了低电压穿越技术的概念、国外的相应标准，继而分析比较了有关此技术的双馈感应发电机建模问题、各种常见的实现低电压穿越的技术手段及改进控制策略。最后描述了具备此技术的风电场对电力系统的影响。

根据电机学中异步电机的相关知识推导了双馈感应发电机在三相静止坐标系下的数学模型以及运动方程；在对双PWM电压型变流器原理分析基础上，推导了网侧PWM变流器在三相静止坐标系下数学模型；为了便于控制系统设计，应用坐标变换技术将所建数学模型转换到两相旋转坐标系下；基于坐标变换技术和电机矢量控制理论，进行了电网电压定向的网侧变流器矢量控制设计和定子磁链定向的转子侧变流器矢量控制设计的研究；进行了亚同步速和超同步速时电机变速恒频发电和有功无功独立调节的仿真研究，仿真结果表明所设计的系统在实现了变速恒频发电的同时，实现了P、Q的完全解耦控制，验证了双馈感应风力发电系统理论分析和控制策略设计的正确性与可行性。

关键字风力发电；变速恒频；双馈发电机；矢量控制

Abstract

With the rapid increase of the proportion of wind power supply in some areas, the impact of large-scale wind farms on the stability of regional power grid is becoming more and more obvious. The low voltage ride through technology of wind turbines has attracted more and more attention. This paper first introduces the concept of the corresponding standard, low voltage ride through technology abroad, technical means to realize the low voltage ride through the analysis and comparison of all kinds of doubly fed induction generator modeling problem, this technique is common and improved control strategy. Finally, the influence of wind farm with this technology on power system is described.

According to motor learning related knowledge of induction motor mathematical model is deduced in the three-phase static coordinate system of doubly fed induction generator and the equation of motion; in the analysis of dual PWM voltage source converter based on the principle, derivation of the grid side PWM converter in the three-phase static coordinate system mathematical model; in order to facilitate the design of control system, the application of coordinate technology will transform the mathematical model into the two-phase rotating coordinate system; coordinate transformation technology and motor

vector control based on the theory of rotor side converter vector control design and the design of the stator flux orientation vector control grid voltage oriented network side converter; simulated sub synchronous speed and super synchronous speed motor VSCF and independent active and reactive power regulation, simulation results show that the design of the system in the realization of the VSCF wind power generation at the same time The complete decoupling control of P and Q is realized, and the correctness and feasibility of the theoretical analysis and control strategy design of doubly fed induction generator are verified.

Key words wind power generation; variable speed constant frequency; doubly fed generator; vector control