By Man-Chung Wong, Ning-Yi Dai, Chi-Seng Lam
This ebook describes parallel strength digital filters for 3-phase 4-wire structures, targeting the keep watch over, layout and approach operation. It provides the fundamentals of power-electronics suggestions utilized in strength platforms in addition to the complex strategies in controlling, enforcing and designing parallel energy electronics converters. The power-quality reimbursement has been accomplished utilizing energetic filters and hybrid filters, and circuit types, keep an eye on ideas and operational perform difficulties were demonstrated by means of precept learn, simulation and experimental effects. The state of the art examine findings have been typically constructed by way of a staff on the collage of Macau.
Offering historical past info and comparable novel thoughts, this ebook is a necessary source for electric engineers and researchers eager to paintings on power saving utilizing power-quality compensators or renewable strength strength electronics platforms.
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Additional info for Parallel Power Electronics Filters in Three-Phase Four-Wire Systems: Principle, Control and Design
Sample text
In the following section, the development and different shunt power quality compensators in distribution power system are introduced and discussed. 6 Shunt Power Quality Compensators Shunt capacitor banks (CBs) as shown in Fig. 4 are used extensively in distribution power systems for power-factor correction and feeder voltage control. The principal advantages of CBs are their low cost and flexibility of installation and operation. However, the CB can easily be burnt if the current harmonics level is high.
54). 55). 56) so that the scalars, Ka , Kb and K0 , are pffiffiffiffiffiffiffiffi pffiffiffi 2=3vdc Sa , 1= 2vdc Sb and 0 correspondingly. It should be noticed that vdc is the half value of vPN as shown in Fig. 23. There is no zero-component coincidentally, which changes 3-D a-b-c coordinates on 2-D α-β plane. ~ vthreeÀleg "rffiffiffi # 2 1 ¼ vdc na þ pffiffiffi Sb Á ~ nb Sa Á ~ 3 2 ð2:56Þ where Sa ¼ Sa À 12 Sb À 12 Sc and Sb ¼ Sb À Sc . 2 Two-Level Three-Leg Center-Split Converters Comparing Fig. 24 with Fig. 23, node “O” is connected with node “n”.
The unbalance exists in power networks can cause the following problems: (1) In low voltage distribution sites, three-phase unbalance loading may cause user’s voltage variation. On one side, the terminal voltage may be higher and it may destroy electric applications, and the electric applicants in low voltage side may not operate normally. 5 shows a three-phase four-wire Fig. 4 Three phase current and neutral current waveforms 24 2 Basic Principles for Parallel Power Electronic Filters Fig. 5 A three-phase four-wire system Fig.