47.Power Electronics by John G. Webster (Editor) PDF

By John G. Webster (Editor)

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Wiley Encyclopedia of Electrical and Electronics Engineering. Copyright # 1999 John Wiley & Sons, Inc. 234 BATTERY STORAGE PLANTS Utility network Battery station Ac switch gear Utility 12 kV Filter capacitors Power converter Converter transformer Dc switch gear Cell gating signals Converter controls Watt and VAR commands Utility conditions sensing Frequency, voltage, system stability signals Facilty controls Battery strings Battery cell voltages, temperatures, amperehours Figure 1. Elements of a battery storage plant.

The resultant current per string was over 2000 A, and the converter input current was over 6000 A. These current levels require massive conductors and switchgear and great attention to maintaining low resistance at all connections. BATTERY STORAGE PLANTS The voltage selection is limited not by the battery but by the other components in the system. The power semiconductors are not voltage limiting at the present time. The devices needed are generally available with peak ratings up to 6000 V. This would be adequate for a dc voltage of approximately 3500 V maximum without series operation of semiconductors.

This unbalance can be detected by monitoring cell voltage and cell temperature. The voltage is typically monitored in sets of four to six cells, or as many as can be combined without masking the deterioration of one cell in the set. 3 V per cell for several hours to refresh the charge on those cells that are not being fully charged by the float voltage. In some cases, the cell must be replaced. SELECTING AND RATING THE CONVERTER Choice of Power Semiconductors Power semiconductors suited to converters for battery energy storage converters fall into the following classes: Thyristors (SCRs).

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47.Power Electronics by John G. Webster (Editor)

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