By John G. Webster (Editor)
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Additional info for 47.Power Electronics
The converter consists of three identical power cabinets and a small central control cabinet. 4 m high. The converter cabinets are cooled by forced air. 3 MVA, 60 Hz. The waveform of each cabinet’s ac output is a threephase square wave with one or more notches or periods of zero voltage on the wave. The outputs of the three cabinets are each phase shifted by 20 electrical degrees from the next. These outputs are combined in three transformers, with the line-side windings in series, in such a way as to generate a three-phase output with harmonics canceled up to the 17th harmonic.
In this case a battery storage plant can often provide a buffer to postpone the need for additional facility. All the functions of a BESS serve to reduce the need for additional generation or transmission capability. Battery plants can be planned and built relatively quickly (3 years or less), and have minimum environmental impact. They do not make noise or require fuel storage facilities. Their emissions and spill hazards are easy to contain. The materials of the batteries are fully recyclable.
5 MW, with storage times from 10 s to 1 h. This application is described in more detail in the next section. 235 Situations Suited to Battery Storage Plants Power Grids. Power systems in developed countries tend to be connected in grids. That is, all of the power companies over an area of up to 200,000 square miles, serving peak loads of more than 40,000 MW, are connected by transmission lines and by agreements to exchange power among utility companies. In such networks, the transient caused by a sudden change of operating conditions, such as the tripping of a large generator, can be absorbed by spreading it out among the large connected base.
47.Power Electronics by John G. Webster (Editor)