新能源发电并网系统的控制策略  

Control strategy of grid-connected power generation system on renewable energy

作　　者：薛媛[1] 陈哲照[1] 王涛[1] 翟莎[1] 王喜刚[1] 

机构地区：[1]西安理工大学,陕西西安710048

出　　处：《电力系统保护与控制》2008年第13期11-14,共4页Power System Protection and Control

摘　　要：滞环电流控制方法具有动态响应速度快和电路跟踪性能好的优点,该方法获得了广泛的应用和发展。从降低开关频率和改善系统输入电流谐波总畸变率THD(Total Harmonic Distortion)的角度出发,研究和设计了一种具有倍频效果的改进三态正弦电流滞环宽度控制方法,可以有效地减少开关管功率损耗,降低并网逆变器系统的THD。利用Matlab/Simulink仿真进行分析,与传统的固定滞环电流控制方法相比较,在相同电路参数和控制参数条件下,应用改进三态正弦电流滞环宽度控制方法,减小了功率开关管损耗,降低了脉宽调制(PWM)逆变器系统的THD,有利于提高并网系统的稳定性和运行效率。A hysteresis current control method which has a high speed of dynamic response and superior capability in circuit tracing is presented in this paper. It is employed and developed extensively. The novel three-level sine current hysteresis width control , which doubles frequency, reduces switching frequency and ameliorates total harmonic distortion of system current, is researched and designed. The comparison of three-level sine current hysteresis width control with traditional fixed hysteresis current control in the switching frequency, total current harmonic distortion is complemented, at the same condition of circuit parameter and control parameter. The Matlab/Simulink simulation results show that three-level sine current hysteresis width control can reduce the switching-loss of the power devices and pulse-width modulation inverter system, which is helpful to improve the stabilization and efficiency of grid-connected Operating.

关 键 词：滞环电流控制 开关频率 谐波总畸变率 仿真 脉宽调制 

分 类 号：TM61[电气工程—电力系统及自动化]