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Earthquake and transportation vibration damping support arrangement in a parallel inverter arrangement installed to a container

IP.com Disclosure Number: IPCOM000245010D
Publication Date: 2016-Feb-05
Document File: 3 page(s) / 103K

Publishing Venue

The IP.com Prior Art Database

Related People

Jarkko Hyttinen: INVENTOR [+2]

Abstract

This document discloses a mechanical arrangement for damping earthquake or transportation vibration in a parallel inverter arrangement installed to a container. The disclosed arrangement comprises mechanical support structure between the top parts of the parallel installed inverter cabinets. The arrangement enables inverter cabinets to be designed with lighter structure materials without compromising the vibration endurance of the arrangement.

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Page 01 of 3

ABB

1.Abstract

This document discloses a mechanical arrangement for damping earthquake or transportation vibration in a parallel inverter arrangement installed to a container. The disclosed arrangement comprises mechanical support structure between the top parts of the parallel installed inverter cabinets. The arrangement enables inverter cabinets to be designed with lighter structure materials without compromising the vibration endurance of the arrangement.


2.Background

Mechanically parallel installed inverter arrangement is common at least in utility size outdoor photovoltaic systems where there usually are two inverters assembled side by side inside a freight container or the like. When the container residing the inverters is being transported by a truck or a ship, the container is often subjected to substantial vibrations which can lead to high tensions in the mechanical structures of the inverter. Even more severe case is when the installed container is subjected to earthquake conditions which can lead to heavy damage to the structures unless the structures are specifically designed to endure such conditions.

Typically said inverter cabinets are bolted from the bottom frame structure to the container floor. In the case where there are only negligible vibrations in the installation, this type of coupling would be good enough to keep the inverter in its place. However if the cabinets are tall and narrow, they are very susceptible for the lateral movement to cause high tensions and even damage in the structure.

Fig 1. Example of an outdoor container residing parallel installed inverters, (PVS800-IS).

In order to design a tall (>2m) electrical inverter cabinet having relatively high central point of gravity to withstand high lateral accelerations and vibrations which can be present in the before mentioned conditions, durable structures have to be used. In these conditions special materials have to be selected or material thickness on the structures need to be increased which can lead to heavy and expensive structures which in turn can be difficult and costly to transport.

© Copyright 2016 ABB Technology Ltd, Affolternstrasse 44, CH-8050 Zurich, Switzerland. All rights reserved.

Page: 1/3 Date: February 5, 2016

Earthquake and transportation vibration damping support arrangement in a parallel inverter arrangement installed to a container



Page 02 of 3

ABB

One known type of arrangement is to attach the inverter cabinets from the top part of the inverter cabinet to the wall structure of the container. This however adds complexity to the container structure and makes the design more costly.


3.New solution

According to the new solution the parallel installed inverter cabinets are supported from top part of the inverter cabinet to each other as depicted by figure 2. The support can be for example metal beam which is bolted to the top frame structure of both of the inverter cabinets. Alternatively the support beam can be made of othe...