Origin Electric Company, Limited

Jirou Fukui

Masaaki Ohshima

Shuuichi Ushiki

Hirokazu Shimizu

Shuichi Ushiki

An electric power source in which a plurality of inverters operate on the same frequency and the plurality of inverters are connected in parallel so that a resistance value expressed by (1&#x2212;&#x3b2;&#xb7;G)/(&#x3b1;&#xb7;G) where &#x3b1; is the output voltage feedback gain, &#x3b2; is the output current feed forward gain, and G is the inverter current gain, is made to be the equivalent output impedance; and is an electrical power source in which the cross-current between the inverters are made to be an acceptable value or below by adjusting the output of each of the inverters by controlling the equivalent output impedance by modifying both or either one of the output voltage feedback gain &#x3b1; or the output current feed forward gain &#x3b2;.

Electrical power source, operational method of the same, inverter and operational method of the same

The present invention is an electric power source in which a plurality of inverters operate on the same frequency and the plurality of inverters are connected in parallel so that a resistance value expressed by (1&#x2212;&#x3b2;&#xb7;G)/(&#x3b1;&#xb7;G) where &#x3b1; is the output voltage feedback gain, &#x3b2; is the output current feed forward gain, and G is the inverter current gain, is made to be the equivalent output impedance; and is an electrical power source in which the cross-current between the inverters are made to be an acceptable value or below by adjusting the output of each of the inverters by controlling the equivalent output impedance by modifying both or either one of the output voltage feedback gain &#x3b1; or the output current feed forward gain &#x3b2;.

A three-phase voltage-fed AC/DC converter includes a conversion circuit which converts power from a DC voltage source to three-phase AC power. The converter further includes a UM conversion circuit which carries out dq conversion of the three-phase output voltage, a superior voltage control circuit which outputs a voltage reference vector based on a superior reference vector and an output voltage vector obtained by the UM conversion circuit, an inferior voltage control circuit which outputs a PWM reference based on the voltage reference vector and the output voltage vector, and a frequency control circuit which synchronizes a value generated based on a q-axis component from the UM conversion circuit with a rotation angle of a conversion matrix in the UM conversion circuit.

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Tokyo, Japan

Jirou Fukui