PCS off-grid mode voltage and current source parallel connection system and method

The invention discloses a PCS off-grid mode voltage and current source parallel system and method, a host and a slave are competed through master-slave competition, the host calculates the total load current of the system according to the output voltage and issues the required given current to the slave, all modules are linked into a whole, and the dynamic response of the load is improved; the host sends the phase of the host to the slave through a synchronization pulse, the slave carries out phase locking, it is guaranteed that no phase delay exists between the modules, the phase locking angle serves as the orientation angle of DQZ conversion, and it is guaranteed that the modules are located in the same DQZ coordinate system; a host transmits DQZ current amplitude information through high-speed communication, since alternating current is converted into direct current through DQZ conversion, the delay tolerance degree generated by communication transmission is enhanced, the change of given current is small i