风电并入微网逆变器合成谐波阻抗谐波抑制

针对微网风力发电并网逆变器中大量使用电力电子器件会对微网造成谐波干扰的问题,利用合成谐波阻抗有功无功解耦控制方法,使微网系统输出给定有功功率和无功功率;在系统中增加谐波阻抗环,并应用瞬时无功理论,通过低通滤波器得到各次谐波分量,在主要谐波频率上合成新的谐波阻抗.通过Matlab/Simulink仿真结果表明,合成谐波阻抗可使谐波干扰得到有效抑制并且避免了传输线路上谐振的产生.

Synthesis harmonic impedance for harmonic suppression of wind power micro grid inverter

The harmonic interference will be brought in the micro grid due to the heave use of power electronics in the wind power micro grid inverter. In order to solve the above mentioned problem, the given active and reactive power in the micro grid system were output based on the synthesis harmonic impedance decoupled control of active and reactive power method. Through increasing the harmonic impedance loop and adopting the instantaneous reactive power theory, every harmonic component was obtained with the low pass filter. The new harmonic impedance was synthesized at the main harmonic frequency. The results of Matlab/Simulink simulation show that the synthesis harmonic impedance will effectively suppress the harmonic interference and avoid the generation of resonance on the transmission line.