摘要
针对风电系统中中点箝位式多电平并网逆变器存在的传统空间矢量调制方法(SVPWM)计算繁琐和中点电压不稳定的问题,在120°坐标系下,将传统SVPWM中大量的三角函数和求根运算用线性运算代替,通过简化SVPWM算法,减小运算量、提高运行效率;通过直流侧中点电压偏差调节矢量运行时间,实现直流侧中点电压平衡控制,减小谐波含量;并对风电系统的逆变并网部分进行了仿真,结果验证了该SVPWM调制方法的可行性和有效性,为实际中实现具有较高电能质量的风电并网提供了研究基础.
Aiming at the problems of complex Space Vector Pulse Width Modulation( SVPWM) and neutral point voltage fluctuation of three-level neutral point clamped inverter in wind power system,an improved SVPWM modulation method is presented in this paper. The linear calculation is used to simplify the three-level SVPWM algorithm and increase the efficiency instead of the numerous trigonometric functions and squre-root function in the traditional three-level SVPWM algorithm under the 120° coordinate system.The neutral point voltage error is introduced in the improved SVPWM algorithm to adjust the acting time of small vectors and the DC-link neural point voltage balance control is solved.The model of active inverter part of wind power grid-connected system with this improved SVPWM modulation has been simulated,the simulation results verify the feasibility and effectiveness of the proposed strategy,which provides theoretical basis on completing wind power grid integration of high power quality in practice.
出处
《湖北民族学院学报（自然科学版）》
CAS
2017年第4期453-457,共5页
Journal of Hubei Minzu University(Natural Science Edition)
基金
湖北省教育厅科技项目(Q20161901)
湖北民族学院博士启动项目(MY2013B024)
关键词
空间矢量脉宽调制
多电平逆变器
线性运算
中点电位
风电并网
space vector pulse width modulation
multi-level inverter
linear calculation
neutral point voltage
wind power grid-connected
