In the first mode (during normal operation of the network) the BESS is controlled to provide reduction of power losses, mitigation of voltage deviation and reactive power support. The provision of the reactive power support may be activated only if such support is required in the network.
The BESS provided a reactive power support which helped in improving the power system voltage profile as seen in Fig. 27. In a situation where the reactive power support is not required, it could be deactivated, and the reactive power provided during the 10 s will be zero as evident in Fig. 28.
Fig. 1. Schematic diagram of BESS control system (Alhejaj and Gonzalez-Longatt, 2016). There are five submodels of this control unit. These are the battery model, the power converter model, the charge controller model, the PQ controller model and the frequency controller model.
Initially, the total power losses in the test model without BESS is 26.08 MW. However, when it is connected to different buses in the test system, the power losses changed as summarized in Table 15. Fig. 29 shows a comparison of the power losses when BESS is placed on each of the buses in the studied test model.
Rooms or enclosures containing electrical equipment controlled by a lock are considered accessible to qualified persons [110.26 (F). Remember, the NEC and OSHA give the minimum working space distances for various types of conditions. Those are not the average, maximum, or target distances.
For large equipment containing overcurrent, switching, or control devices, an entrance to (and egress from) the required working space at least 24 in. wide and 6½ ft high is required at each end of the working space [110.26 (C) (2)]. This requirement applies for either of the following conditions:
Based on findings like these, a minimum safety distance of 1/4 mile (1320 feet) might be considered prudent. And again, individuals with EMF hypersensitivity or other serious health issues may want to consider a much greater safety distance, perhaps a half mile, or even more.
Dedicated electrical rooms should never be used for storage, and a clear path of travel should be maintained for emergency egress. Oftentimes, these rooms become a catchall for everything from spare light bulbs to office supplies. Inspectors should report on relevant findings in their report.
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