No abstract

Increase of rectifiers for converting AC current to DC current can increase current harmonic in grids. These rectifiers can be Diode rectifiers or Thyristor based rectifiers used for variable speed drives or other applications. Then, a filter should be used to reduce these harmonic components. In this project, a Voltage Source Converter (VSC) is used as distributed static var compensation (D-STATCOM) to mitigate current harmonic produced by rectifiers. This Power quality issue is introduced, and its IEEE standard is discussed. Then its source and effect on grid is studied and simulation results are shown. Finally, a VSC D-STATCOM is used for mitigation of current harmonic in power systems.

The chromophore 2,4,6‐tri(pyridyl‐4‐(3‐sulphonatopropyl))‐1,3,5‐triazine (TPST) was used in hydrogel electrochromic devices (ECDs). The hydrogel consists of TPST, K3[Fe(CN)6]/K4[Fe(CN)6] (K3) or 1,1’‐ferrocenedimethanol (FM), and sodium carboxymethyl cellulose. The devices showed dual‐band properties, K3‐TPST exhibiting absorption in NIR region at low voltage, while absorption of ECDs blue‐shifting at −2.8 V. ECDs changed from transparent to olive green to black with a coloration efficiency of >126.74 cm2/C at 850 nm and high cycling stability. The optical contrast of FM‐TPST ECD remains 79.3 % of the first cycle contrast after 2100 cycles. TPST can change its color from transparent to black at a high voltage of −2.2 V, with relatively short switching times (FM‐TPST, 5.3 s, and K3[Fe(CN)6]/K4[Fe(CN)6]‐TPST, 3.8 s). The response was accelerated up to 5 times by introducing a sulfonyl group with comparison to our previous work. The devices using TPST with sulfonyl moiety provide a new way for the fast‐response energy‐saving smart windows.