Origin Electric Company, Limited

Yasuhiro Genjima

Masaaki Ohshima

Kiyomi Watanabe

Shuichi Ushiki

A method and a single-phase voltage type AC/DC converting device and a three-phase voltage type AC/DC converting device arranged between a load and a distribution network. The converting devices are capable of contributing to stabilize a system frequency and a system voltage. By applying an autonomous parallel operation control technique of an AC/DC converter to a load, which receives power from a distribution network, drooping characteristics (governor-free characteristics) for a frequency of active power and voltage-maintaining characteristics (V-Q characteristics) may be obtained. The governor-free characteristics automatically decrease and increase received power when the system frequency decreases and increases, so that even the load may contribute to stabilize the system frequency. The V-Q characteristics generates/absorbs reactive power so as to maintain a voltage at a receiving end constant regardless of load power to further stabilize the system voltage.

Single-phase voltage type AC/DC converter, three-phase voltage type AC/DC converter, and stabilization control method

According to the present invention, there are provided a coating material composition for chromium plating, which can maintain high adhesion to the chromium plated surface of a chromium plated material having reduced adhesion for a long period and also can form a coating film having excellent chemical resistance, and an article comprising a coating film made of the same. The coating material composition for chromium plating, comprises a vinyl-based polymer (A) obtained by polymerizing a vinyl-based monomer mixture containing a vinyl-based monomer having an amino group, and a compound (B) having an epoxy group and a hydrolyzable silyl group in a molecule, wherein the vinyl-based polymer (A) has a glass transition temperature of lower than 30&#xb0; C., and the content of the vinyl-based monomer having an amino group is 5% by weight or more and less than 20% by weight in the vinyl-based monomer mixture (100% by weight).

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Tokyo, Japan

Yasuhiro Genjima