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Modular concept to build an outdoor photovoltaic inverter

IP.com Disclosure Number: IPCOM000241880D
Publication Date: 2015-Jun-05
Document File: 6 page(s) / 82K

Publishing Venue

The IP.com Prior Art Database

Related People

Matti Jussila: INVENTOR [+11]

Abstract

This document discloses a modular outdoor PV inverter assembly, where multiple independent inverter modules and power blocks are being joined to form a utility scale PV inverter. The document also discloses an arrangement of distributing auxiliary supply within the inverter. Additionally the document discloses arrangement of AC and DC switching devices of a modular PV inverter design.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 31% of the total text.

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1.Abstract

This document discloses a modular outdoor PV inverter assembly, where multiple independent inverter modules and power blocks are being joined to form a utility scale PV inverter. The document also discloses an arrangement of distributing auxiliary supply within the inverter. Additionally the document discloses arrangement of AC and DC switching devices of a modular PV inverter design.


2.Background

Typically utility scale PV inverters (>1MW) are not fully modular, they usually have modular power units (eg. IGBT packs), but also they have part of the power circuit commonly used by the parallel connected power modules (eg AC or DC components, breakers or contactors). This can create a situation where the PV inverter is not fully capable of redundant operation.


3.New solution

In this new solution the utility scale PV inverter is being built fully modular where each module comprise DC components for PV generator connection, inverter power modules for power conversion and AC components for grid connection. Each power section have their own grid filtering (eg. LCL, LC). These modules can be united and inverter power can be scaled in accordance with the customer power demand. Fully modular PV inverter concept therefore creates cost efficient way of building variable power ratings and also enables fast response time to the changing customer needs.

The new PV inverter concept has common AC grid output connection but each of the power sections (individual inverter units) have their own PV generator inputs. Having separate PV generator inputs enables the inverter to have multiple MPPTs, one for each power section. Additionally the PV generator inputs can be combined inside the PV inverter if single MPPT is required by the customer. Modular power section concept is shown in figures 1a-1c.

Each of the power sections can have their own individual control and cooling systems in order to create redundant operation in fault situations in a single power section.

Each power section is weather proofed against outside air impurities and moisture and thus enables operations even in the harshest environments.

Control components of the modular PV inverter can be either divided to each power section or they can be united to a single control section for convenience. Control section auxiliary power supply can be taken via a separate transformer from the grid or from the nearest power section auxiliary power distribution. Upper level control (eg SCADA) will see the inverter as one device despite the inverter having multiple individual inverter sections with their separate MPPTs.

© Copyright 2015 ABB Technology Ltd, Affolternstrasse 44, CH-8050 Zurich, Switzerland. All rights reserved.

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Modular concept to build an outdoor photovoltaic inverter

Date: June 5, 2015


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Date: June 5, 2015

Plant control

Plant control

Power section 1

DC input

  Control section

  AC output

  Control section

  AC output

Power sec...