Abstract: In a power grid stabilization system, a second energy storage system has a larger energy storage capacity than a first energy storage system. A bidirectional AC/DC converter is connected between an AC power grid and a pair of input and output terminals of the first energy storage system. A first bidirectional DC/DC converter is connected between the pair of input and output terminals of the first energy storage system and a pair of input and output terminals of the second energy storage system.

Abstract: A wet paper web transfer belt for transferring a wet paper web includes a wet paper web contacting surface for carrying the wet paper web. The wet paper web contacting surface is constituted by a resin layer. The wet paper web contacting surface includes, in the width direction, sheet edge regions for carrying the edge parts of the wet paper web and a center region for carrying the center vicinity of the wet paper web. The arithmetic average roughness Ra1 (?m) of the wet paper web contacting surface in the sheet edge regions is smaller than the arithmetic average roughness Ra2 (?m) of the wet paper web contacting surface in the center region, and prescribed roughness related equations are fulfilled.

Abstract: A wet paper web transfer belt for transferring a wet paper web includes a wet paper web contacting surface for carrying the wet paper web. The wet paper web contacting surface is constituted by a resin layer, and the wet paper web contacting surface includes a wet paper web carrying region for carrying the wet paper web. A prescribed relation of the swelling rate in water of the resin layer and the surface roughness of the wet paper web contacting surface is fulfilled in accordance with the basis weight of the base paper of the wet paper web.

Abstract: A wet paper web transfer belt for transferring a wet paper web includes a wet paper web contacting surface for carrying the wet paper web. The wet paper web contacting surface is constituted by a resin layer. The wet paper web contacting surface includes, in the width direction, sheet edge regions for carrying the edge parts of the wet paper web and a center region for carrying the center vicinity of the wet paper web. The arithmetic average roughness Ra1 (?m) of the wet paper web contacting surface in the sheet edge regions is smaller than the arithmetic average roughness Ra2 (?m) of the wet paper web contacting surface in the center region, and prescribed roughness related equations are fulfilled.

Abstract: A wet paper web transfer belt for transferring a wet paper web includes a wet paper web contacting surface for carrying the wet paper web. The wet paper web contacting surface is constituted by a resin layer, and the wet paper web contacting surface includes a wet paper web carrying region for carrying the wet paper web. A prescribed relation of the swelling rate in water of the resin layer and the surface roughness of the wet paper web contacting surface is fulfilled in accordance with the basis weight of the base paper of the wet paper web.

Abstract: The problem of this invention is to inhibit the infiltration of a lubricating oil supplied to the contact area of the shoe with the belt into the high molecular weight elastic member, and to offer a shoe press belt which has an excellent performance improving durability of the friction surface, preventing flaking off phenomena, cracks, and breakage; and its manufacturing method. An endless shoe press belt the inner portion 1a of which is adapted to contact a shoe S of a papermaking machine, said inner portion 1a being composed of a high molecular weight elastic material, characterized in that the surface of said inner portion is provided with a protective oil 3 comprising an oil the viscosity of which is higher than that of a lubricating oil J supplied to the contact area of said inner portion with said shoe, or a paste-like oil having a certain consistency. It effectively prevents infiltration of the lubricating oil into the surface of the inner portion of the belt.