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WIND TURBINE WITH BATTERY STORAGE CONTROL METHOD FOR DISCONTINUOUS TO CONTINUOUS MODE

IP.com Disclosure Number: IPCOM000238543D
Publication Date: 2014-Sep-03
Document File: 6 page(s) / 146K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention proposes a technique for accurate control to a battery energy storage system in a wind turbine system. The technique includes a control circuit scheme for more accurate control in the system with a bi-directional DC-DC switching power supply to operate in both continuous and discontinuous current mode. The control circuit scheme operates in both modes during transition. The control circuit scheme is utilized for alternate energy system, such as, wind and solar energy system.

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WIND TURBINE WITH BATTERY STORAGE CONTROL METHOD FOR DISCONTINUOUS TO CONTINUOUS MODE

BACKGROUND

The present invention relates generally to a wind turbine and more particularly to a battery storage control for discontinuous to continuous mode operation in the wind turbine.

Generally, a battery and a bi-directional DC-DC switching power supply are utilized to transfer energy back and forth in a wind turbine system. Transfer of energy is between a DC link of AC-DC-AC converter and battery by a bi-directional DC-DC switching power. Figure 1 depicts a system with the battery and the bi-directional DC-DC switching power supply.

Figure 1

Figure 2 depicts a system with the battery and the bi-directional DC-DC switching power supply.

Figure 2

The bi-directional DC-DC switching power requires insulated gate bipolar transistor (IGBT) module and a filter. Figure 3 depicts details of bi-directional DC-DC switching power supply of Figures 1 and 2.

Figure 3

The filter is a combination of inductors, capacitors and resistors. Current in the filter inductor, L is either continuous or discontinuous. Figure 4 depicts details of current in filter inductor, L, for continuous and discontinuous mode.

Figure 4

Besides functioning as a battery charge controller, for controlling power flow to and from the battery, bi-directional DC-DC switching power supply is utilized to regulate voltage of the battery at a level appropriate for the battery as the voltage of the AC-DC-AC converter is not same.

A conventional technique includes a bi-directional DC-DC switching power supply to regulate voltage of the battery at an appropriate level. However, the conventional technique is not efficient to regulate the voltage.


It would be desirable to have an efficient technique to regulate the voltage of the battery in the wind turbine system.

BRIEF DESCRIPTION OF THE DRAWING

Figure 1 depicts the system with the battery and the bi-directional DC-DC switching power supply.

Figure 2 depicts the system with the battery and the bi-directional DC-DC switching power supply.

Figure 3 depicts details of bi-directional DC-DC switching power supply in Figures 1 and 2.

Figure 4 depicts details of current in filter inductor, L, for continuous and discontinuous.

Figure 5 depicts the graft for calculation of “effective L”, which is from zero during discontinuous mode to the full value of L during continuous mode.

DETAILED DESCRIPTION

The present invention proposes a technique for accurate control of voltage to a battery energy storage system in a wind turbine system. The technique includes a control circuit scheme for more accurate control in the system with a bi-directional DC-DC switching power supply to operate in both continuous and discontinuous current mode. The control circuit scheme operates in both modes during transition. The control circuit scheme is utilized for alternate ene...