Browse Prior Art Database

VIRTUAL GROUND FOR WIND TURBINE GENERATORS

IP.com Disclosure Number: IPCOM000238545D
Publication Date: 2014-Sep-03
Document File: 4 page(s) / 134K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention proposes a technique to provide a power electronic solution required to provide a ground source to a wind turbine generator. The technique includes a power electronic solution, which is relatively small addition to the wind turbine generator and adds a virtual ground. The virtual ground provides a zero-sequence current required to provide a ground source and is isolated from the wind turbine generator.

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 54% of the total text.

VIRTUAL GROUND FOR WIND TURBINE GENERATORS

BACKGROUND

The present invention relates generally to a wind turbine generators and more particularly to a power electronic solution required to provide a ground source to a wind turbine generator.

Generally, a wind turbine generator system requires a ground source to operate and the generator to be ungrounded.  This require to utilize a delta-wye grounded transformers and/or separate grounding transformer.  The grounding transformers are expensive and unable to provide information about the ground transformer impedance. Developers utilize high-speed grounding switch as an alternative to the grounding transformer in the wind turbine system.

A conventional technique includes a circuit breaker apparatus with an integrated grounding switch in a housing.

Another conventional technique includes a circuit breaker arrangement as an air-insulated medium voltage switching arrangement with feature of circuit breaking, disconnection and grounding.

Yet another conventional technique includes a vacuum switch with a vacuum container, a grounding switch and a load switch disposed in the container.

However, the conventional techniques utilize the grounding switches and in turn results stresses to the wind turbines by imposing a fault.

It would be desirable to have an efficient technique to the wind turbine without imposing the faults.

BRIEF DESCRIPTION OF THE DRAWING

Figure 1 depicts the virtual ground device to the power system.

Figure 2 depicts an inverter in single phase to the power system.

Figure 3 depicts the virtual ground device to the power system in existing solidly grounded system.

Figure 4 depicts virtual ground device applied to the power system in existing delta-connected system.

DETAILED DESCRIPTION

The present invention proposes a technique to provide a zero-sequence current for a ground source to a wind turbine generator. The technique includes a power electronic solution, which is relatively small addition to the wind turbine generator and adds a virtual ground. The virtual ground provides...