摘要
光伏逆变器的非线性特性导致相电压和相电流畸变,使得系统性能降低,在详细分析非线性效应的理论基础上,提出了一种非线性补偿策略。该补偿策略在两相静止坐标系下,根据电流空间矢量所在的不同扇区,将逆变器功率器件导通压降带来的电压偏差前馈给指令电压来进行补偿,保证了并网电压空间矢量仍为圆形轨迹,提高了相电压和相电流的正弦度。该补偿策略简单有效,能有效对非线性误差进行补偿,最后通过仿真结果表明,所提出的新型非线性补偿策略能够有效减小非线性误差造成的电压电流畸变现象,提高了系统运行性能。
The nonlinearity of photovoltaic inverter often causes distortion of phase voltage and phase current, consequently affecting the system performance; therefore, this paper puts forward a nonlinear compensation strategy based on detailed analysis of nonlinear effect theory. This compensation strategy uses the current space vector sector under the two-phase static coordinate system to compensate the voltage deviation caused by nonlinear, and feed forward to the command voltages, which ensures the grid voltage space vector is still in circular trajectory and improves the sine degree of the phase current and the phase voltage. This simple and ef- fective compensation strategy can effectively compensate for nonlinear error. Finally, the simulation results show that this new nonlinear compensation strategy can effectively reduce the voltage and current distortion caused by nonlinear error, and can improve the system performance.
出处
《电力与能源》
2016年第1期75-79,共5页
Power & Energy
关键词
光伏逆变器
电流空间矢量
非线性补偿
photovoltaic inverter
current space vector
nonlinear compensation
