POWER CONVERSION SYSTEM
First Claim
1. A power conversion system comprising:
- n (n being an integer of 2 or more) power conversion devices (P1 to P4) connected in parallel to a load (4); and
a communication line (2) connected to said n power conversion devices (P1 to P4),each of the power conversion devices includingan inverter (31) converting direct-current (DC) power into alternating-current (AC) power and supplying the AC power to said load,a current sensor (37) detecting a load current value,a communication circuit (10) transmitting the load current value detected by said current sensor (37) to each of other (n−
1) power conversion devices through said communication line (2) and receiving (n−
1) load current values transmitted through said communication line (2) from the other (n−
1) power conversion devices.an operation circuit (11) 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 (37) and said (n−
1) load current values received by said communication circuit (10), anda control circuit (32 to 36, 38 to 59) controlling said inverter (31) such that said shared current is supplied from the corresponding one of the power conversion devices to said load (4) and said cross current is eliminated.
1 Assignment
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Accused Products
Abstract
A power conversion system includes n (n being an integer of 2 or more) power conversion devices (P1 to P4) connected in parallel to a load (4); and a communication line (2) connected to the n power conversion devices (P1 to P4). Each of power conversion devices includes a communication circuit (10) which transmits a load current value detected by a current sensor (37) to each of other (n−1) power conversion devices through the communication line (2), and receives (n−1) load current values transmitted through the communication line (2) from other (n−1) power conversion devices; and an operation circuit (11) calculating a shared current and a cross current of the corresponding power conversion device based on the n load current values. Accordingly, a wiring line is prevented from becoming complicated even when the number of power conversion devices is increased.
17 Citations
4 Claims
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1. A power conversion system comprising:
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n (n being an integer of 2 or more) power conversion devices (P1 to P4) connected in parallel to a load (4); and a communication line (2) connected to said n power conversion devices (P1 to P4), each of the power conversion devices including an inverter (31) converting direct-current (DC) power into alternating-current (AC) power and supplying the AC power to said load, a current sensor (37) detecting a load current value, a communication circuit (10) transmitting the load current value detected by said current sensor (37) to each of other (n−
1) power conversion devices through said communication line (2) and receiving (n−
1) load current values transmitted through said communication line (2) from the other (n−
1) power conversion devices.an operation circuit (11) 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 (37) and said (n−
1) load current values received by said communication circuit (10), anda control circuit (32 to 36, 38 to 59) controlling said inverter (31) such that said shared current is supplied from the corresponding one of the power conversion devices to said load (4) and said cross current is eliminated. - View Dependent Claims (2, 3, 4)
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Specification