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双馈风力发电网侧变换器直接功率控制的研究

新能源与风力发电?

EMCA2014,41(2

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)双馈风力发电网侧变换器直接功率控制的研究

葛 凯, 阮 毅, 赵梅花, 谈 立

(上海大学机电工程与自动化学院,上海 200072)

摘 要:将直接功率控制(Ddirect Power Control,DPC)技术应用到双馈风力发电系统的网侧变换器控制三根据网侧PWM变换器的动态数学模型,用一种简单的方法推导和分析了网侧PWM变换器电压矢量对有功功率和无功功率变化的影响三根据有功功率与无功功率变化的符号选择合适的电压矢量三详细阐述了开关表的制定原则,给出了基于滞环控制器的DPC策略三搭建了基于英飞凌XC2785X的试验平台,试验结果验证了控制策略的可行性和正确性三

关键词:双馈风力发电系统;网侧PWM变换器;功率变化量;直接功率控制

中图分类号:TM301.2 文献标志码:A 文章编号:1673?6540(2014)02?0034?05

Study on Direct Power Control for Grid?Side Converter in

Doubly?Fed Wind Power Generation System

GE Kai, RUAN Yi, ZHAO Meihua, TAN Li

(School of Mechatronics Engineering and Automation,Shanghai University,Shanghai200072,China) Abstract:The direct power control(DPC)technology used in grid?side converter in doubly?fed wind power generation system was applied.According to the dynamic mathematical model of grid?connected PWM converter,the influence on the variations of the active power and the reactive power was derived and analyzed by the voltage vectors with a simple method.The voltage vector was selected according to the signs change of the active and the reactive power.The rule of making the switch table was elaborated,and direct power control strategy based on hysteresis controller was presented.The experimental platform based on Infineon XC2785X was set up and the experimental results verified the feasibility and correctness of the control strategy.

Key words:doubly?fed wind power generation system;grid?side PWM converter;power variation;

direct power control

0 引 言

变速恒频双馈风力发电系统以其较低的变频器容量和较宽的转速运行范围在大功率风力发电系统中具有独特的优势[1]三采用双PWM变换器的变速恒频双馈风力发电系统结构如图1所示三图1中网侧PWM变换器的作用是在各种状态下维持直流母线电压稳定,并且实现交流侧输入功率因数的控制,从而确保转子侧变换器和整个双馈感应电机可靠工作三

网侧逆变器的控制策略,主要有矢量控制和直接功率控制(Direct Power Control,DPC)三矢量控制因其固定的开关频率二输出电流的正弦度好二谐波含量低及电压利用率高而被广泛应用

图1 双馈风力发电系统结构

近年来,DPC渐成为研究热点三电压型PWM 变换器DPC系统具有系统结构简单二不需要PWM二动态响应快速等优点,得到国内外学者的关注和研究[1?2]三文献[3]采用单开关表DPC,没有阐述开关表的制定原则三文献[4]根据网侧变

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