The cascaded STATCOM with delta configuration plays an important role in the unbalanced load compen-sation,and it is an important means to improve power quality.In this paper,through theoretical analysis,a methodof calculating the compensation range of negative sequence current is proposed for compensating the rated reactivecurrent by using the cascaded 10kV·A/(380V) STATCOM with delta configuration.As the individual phase con-trol of the cascaded STATCOM with delta configuration shows a slow dynamic response and a low precision,the in-dividual sequence control is adopted to handle the cascaded STATCOM with delta configuration,thus realizing acomprehensive compensation for reactive and negative sequence components.Finally,in the Matlab/Simulink envi-ronment,a 10kV·A/(380V) STATCOM with delta configuration is built to simulate the system,and the resultsprove the correctness of the calculation method and the control strategy.