RU2207746C2 - Converting plant of container type - Google Patents

Abstract

FIELD: conversion engineering. SUBSTANCE: power modules, control system and forced air cooling system with drawing fans are installed inside cargo container with corrugated walls. Additional internal wall with built-in power modules is moved away from bearing wall by 0.1-0.2 container width and divides container into two spaces: areas of high and low pressure. Additional lifted false floor starts from additional wall and is away from basic floor by 0.1-0.2 container height and stops short of opposite wall of container by distance of 0.1-0.2 its width forming by that window for ingress of air in space between basic floor and false floor. EFFECT: ensured cooling of power modules owing to circulation of cooling air in closed space along walls of bearing structure. 2 dwg

Description

 Usage: electrical, electrical, electrometallurgical, electrochemical industry.

 The invention relates to a conversion technique and can be used in converters for the electrical, energy, electrometallurgical, electrochemical industries.

 Powerful semiconductor converters with forced oil cooling are known [1], in which the oil circulating in a closed circuit is cooled in an oil cooler, where water, air or another heat carrier can be used as a cooling medium.

 Converters [2] are also known, in their appearance resembling oil transformers with natural cooling: a tank with a cooling system of radiators or pipes, on which there is an expander, insulators, etc. Such a design of the converters allows them to be used both for external and internal installation.

 The disadvantages of the cooling system of the above converters are low reliability, non-repairability, high fire hazard, poor overall dimensions.

Closest to the proposed is a container-type conversion plant described in [3]. The container is divided into two rooms: in one - semiconductor converters, in the other - auxiliary equipment and control system. Each converter unit has a water cooling system. The main disadvantages of this installation are the impossibility of its use at low temperatures, which allows its operation only in a heated room or mild climatic conditions, as well as the need for an additional set of equipment for water treatment. Other coolants that have a freezing point below 0 ^° C can be used — ethylene glycol mixtures, polymethylsiloxane liquids, organic oils. However, such liquids require not only a complex set of special equipment for preparing the refrigerant, but also a number of preventive measures to limit erosion and contamination of the walls of the coolant flow channel, which eliminates the installation of all equipment in a single container.

 The objective of the invention is the cooling of power semiconductors of the converter unit due to the circulation of cooling air in a closed volume along the walls of the supporting structure, which acts as a cooler of heated air, which allows you to have a turnkey installation that can operate in a wide range of climatic conditions.

 The essence of the claimed invention lies in the fact that in the container-type converter, in which the power modules, the control system and the forced air cooling system with exhaust fans are located inside the transport container with corrugated walls, an additional inner wall is installed with power modules mounted in it, spaced from the main wall at 0.1 ... 0.2 of the width of the container and dividing the container into two volumes - the high and low pressure areas, and are additional raised raised floor, starting from the additional wall and spaced from the main floor by a height of 0.1 ... 0.2 of the height of the container, and the raised floor ends before reaching the opposite wall of the container by a distance of 0.1 ... 0.2 of the width of the container, forming thereby a window for air to enter the space between the floor and the raised floor.

 The essence of the invention is illustrated by drawings (figure 1, figure 2).

 In FIG. 1 shows a schematic construction of the proposed Converter installation. For clarity, the container is shown with transparent walls.

 The container contains an additional wall 1 with power modules mounted in it with radiators 2. The wall divides the container into two volumes — the low region and the high pressure region — and is located at a distance of k = 0.1. . .0,2b from the side wall of the container. An additional raised floor is installed at a distance of h = 0.1 ... 0.2 s from the main floor, which starts from the additional wall and ends at a distance of 1 = 0.1 ... 0.2 b from the opposite wall of the container. In the lower part of the additional wall, under the raised floor, there are retractor fans 3. The fans take air from the area between the floor and the raised floor and blow it into the high pressure area between the container wall and the additional wall 1. Cold air naturally passes through the radiators of the power modules under the influence of excess pressure into low pressure area and, cooling the modules, heats up. The air is drawn in by the fans 3, passes, cooling, along the corrugated walls of the container and enters through the window in the raised floor into the space between the main floor and the raised floor, passes along the cold floor, is cooled and discharged into the high-pressure area. The duct closed.

 The scheme of air movement in the proposed Converter installation is illustrated in Fig.2. Designations are the same as for figure 1: B is the high-pressure region, N is the low-pressure region. Due to this design of the container, the air taken by the fans from the area between the conventional and raised raised floor air passes through the radiators of the power modules, cooling them, and then cools itself, passing along the corrugated walls of the container, which are, in fact, cooler, and along the usual floor in the space between the normal and raised raised floor.

 The proposed design of the installation allows cooling the power modules due to air circulation inside the container without air intake from the outside.

 NIIPT OJSC has experience in the manufacture and successful operation of this type of converter plants. In particular, an installation for melting ice on electric power lines based on a controlled six-pulse thyristor rectifier was made in an outdoor container. The range of smooth variation of the output values: voltage - 0 ... 50 kV, current - 0 ... 1200 A. The installation has a forced air cooling system, implemented on one fan, which complicates the design, but does not violate the above cooling principle. Currently, installations of this type are operated in power systems of the Far East with difficult environmental conditions.

Sources of information
1. The temperature regime of the thyristors of a powerful converter with forced oil cooling // V.V. Kormyshev, L.D. Epstein / Electrical industry. Series: Conversion Technology. Issue 1, 1975, p. 10-13.

 2. High-voltage semiconductor rectifiers with oil cooling // I.E. Libov / Electrical industry. Series: Conversion Technology. Vol. 1, 1973, pp. 10-12.

 3. Containerized static frequency converter for back-to-back coupling of two MV power grids. // P. Dachler, B. Wiley, M. Streettmatter, E. Suter, J. Frisch / ABB Review, 2/96, pp. 25-31.

Claims (1)

 A container-type conversion unit in which power modules, a control system and a forced air cooling system with exhaust fans are installed inside a transport container with corrugated walls, characterized in that it contains an additional inner wall with power modules mounted in it, spaced 0 from the main wall , 1 ÷ 0.2 of the width of the specified container and dividing the specified container into two volumes - the high and low pressure areas, and an additional raised a raised floor, starting from the additional wall and spaced from the main floor by a height of 0.1 ÷ 0.2 of the height of the specified container, and the raised floor ends before it reaches the opposite wall of the specified container at a distance of 0.1 ÷ 0.2 of its width, thereby the window for air to enter the space between the main floor and the raised floor.

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