Active Damping Adaptive Control of Inverters with High Speed and Low Carrier Frequency Ratio Sensing Signals
Under the condition of high frequency operation and low control carrier ratio,the inverter has resonance spike suppression.An active damping adaptive control technology for inverter under high speed and low carrier frequency ratio sensing signal is proposed.Under the condition of high speed and low carrier frequency ratio sensing signal,the mathematical model of inverter is built.The active damping of the inverter is equivalent to a control voltage loop by the transfer function from output current to capacitor voltage and stator current.The parameters of the active damping adaptive control loop are adjusted,and the active damping adaptive control strategy of the inverter is formulated.The experimental results show that the stability margin of the technology decreases from 2.46 dB to 1.18 dB,which can ensure the stable operation of the inverter;Under different sampling frequencies,the inverter can be controlled to output the grid connected cur-rent with the same phase and frequency as the grid voltage.When the sampling frequency is 5.9f,the output grid connected current and voltage are sinusoidal,and the fluctuation range is[35 A,58 A]and[185 V,225 V]respectively,with good control effect.
sensing signalhigh speed and low carrier-frequency ratioactive damping controlmathematical modelinverter
万方数据
维普
