The invention publishes a light bend combined network transformation installment which based on the Z source power transformation, including: the power transform main return route, the DSP observation system and the IGBT actuation module, the DSP observation system is used in sampling of the voltage, the electric current signal, and operates to obtain the PWM signal sequence with the adjustable pulse width, again transforms the IGBT actuation module into the direct drive IGBT signal, the power transform main return route includes the solar cell array, the Z source impedance network, the contravariant network and the filter reactor, the two out-ports of the solar cell array separately connects with the two input end of the Z source impedance network, the two out-ports of the Z source impedance network separately connects with the two input end of the contravariant network, a out-port of contravariant network connects to a end of filter reactor, a end of the filter reactor is used to connect the end of the electrical network, the another out-port of the contravariant network is used to connect the another end of the electrical network directly, the direct drive IGBT signal which is transformed by the above IGBT actuation module is used in realizing the contravariant network lead and shutdown.