Patent ID: 8964431
Filing Date: 2015-02-24
Classification: H02M

Abstract:
1. A power conversion system comprising: n (n being an integer of 2 or more) power conversion devices connected in parallel to a load; and a communication line connected to said n power conversion devices, each of the power conversion devices including an inverter converting direct-current (DC) power into alternating-current (AC) power and supplying the AC power to said load, a current sensor detecting a load current value, a communication circuit transmitting the load current value detected by said current sensor to each of other (n−1) power conversion devices through said communication line and receiving (n−1) load current values transmitted through said communication line from the other (n−1) power conversion devices, an operation circuit calculating a shared current and a cross current of a corresponding one of the power conversion devices based on the load current value detected by the corresponding current sensor and said (n−1) load current values received by said communication circuit, and a control circuit controlling said inverter such that said shared current is supplied from the corresponding one of the power conversion devices to said load and said cross current is eliminated, wherein said communication line includes a first connector and a second connector provided corresponding to each of the power conversion devices and connected to said communication circuit of the corresponding one of the power conversion devices, and (n−1) multicore cables provided between said n power conversion devices, each of the multicore cables has one end connected to the first connector corresponding to one of two corresponding power conversion devices, and the other end connected to the second connector corresponding to the other of the two corresponding power conversion devices, and each communication circuit transmits said load current value to each of other communication circuits and receives the load current value from each of the other communication circuits, through said (n−1) multicore cables.