Impedance Observation and Ripple Compensation Based on Second-order Sliding-mode Super-twisting Algorithm in DC Microgrid
In DC microgrid,the second-order ripple component of the DC bus voltage can cause interference to the DC load or DC energy,and the power quality of the entire system will be endangered in severe cases.For this reason,based on the voltage/current double closed-loop control of bidirectional DC/DC converter,the DC voltage ripple control of DC active power filter is designed.A fast observation method of disturbance tracking power grid impedance is proposed.The control rate of disturbance step size is designed by using the super-twisting algorithm of second-order sliding mode control,which speeds up the observation speed of impedance coefficient and realizes the fast dynamic observation of impedance coefficient.The real-time tracking and extraction of the required compensation ripple current by the DC active power filter is further realized,and the second-order ripple of the bus voltage of the DC microgrid is effectively suppressed.Finally,the corresponding DC microgrid test platform is built to verify the feasibility and effectiveness of the proposed strategy.
DC microgridsecond-order ripplesperturbation trackingsuper-twisting algorithmimpedance coefficientDC active power filterDC voltage ripple control
万方数据
维普
