In order to improve the input control of the three-level direct matrix converter（TLDMC）

this paper studies the input power control of TLDMC and mainly designs the control method of input reactive current. First of all

the traditional matrix converter and TLDMC are compared and introduced. Secondly

the principle of indirect space vector modulation method used in TLDMC is briefly introduced. Then

a mathematical model is established on the input side of TLDMC

and the control methods for PID and quasi-PR are derived.Furthermore

combined with the TLDMC input power and output volt-age compensation method under unbalanced grid voltages

a sliding mode control（SMC） based input current control system is proposed. The method is compared with traditional PID control. Finally

the correctness of PID control method

quasi-PR control methods and SMC control method is verified by simulation. The comparison between the results of PID

quasi-PR control method and SMC shows that

although PID and quasi-PR control can achieve the desired control target

SMC is more superior in response speed.