By Chi-Seng Lam, Man-Chung Wong
Design and keep watch over of Hybrid lively strength Filters provides an outline of the present caliber difficulties and their compensators. To get a stability among the process fee and function, hybrid energetic strength filters (HAPFs) are beneficial. The ebook provides the assurance of resonance phenomena prevention power, filtering functionality and procedure robustness research of HAPF; nonlinear inverter present slope features and their linear operation sector requirement research of the hysteresis PWM for the HAPF; minimal inverter capability layout approach of HAPF, adaptive dc-link voltage controller for the HAPF and the genuine layout instance of a 220V 10kVA HAPF, within which the method functionality research strategy, minimal dc voltage deduction thought and adaptive dc voltage concept might be additional prolonged into the opposite lively compensators, equivalent to APF, static synchronous compensator STATCOM, and so forth. This publication will gain researchers, graduate scholars, and electrical energy engineers within the box of power-quality compensation.
Dr. Chi-Seng Lam and Dr. Man-Chung Wong are either from the college of Macau, Macao, China.
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10b. 041742 (ii) Frequency spectrum of phase a load current iLx and system currents isx after compensation (ii) Frequency spectrum of phase a load current iLx and system currents isx after compensation Fig. 9 Simulation results for improving the filtering effects of the PPF: a when only PPF is utilized and b HAPF is employed Due to the effect of Vsxh , Fig. 11) sxh with respect to different Ls values when only PPF is employed or HAPF is employed. Similar as Fig. 10, when only the PPF is utilized, harmonic current amplification point will move to the lower frequency side as the increase of Ls value and vice versa, as shown in Fig.
11), the harmonic current amplification phenomenon occurs at x ¼ 1120 rad/s. However, when the HAPF is employed (K = 25 or 50), all the harmonic current components can be significantly decreased as shown in Fig. 8a, b. And the harmonic current amplification phenomenon also disappears. In addition, the larger the K value, the better the filtering performances can be obtained and vice versa. These results verify that the active inverter part of the HAPF is capable to improve the filtering performances of the PPF and compensate the harmonic current caused by both ILxh and Vsxh .
The nonlinear loads are composed of three single-phase diode bridge rectifiers, which act as harmonic producing loads in this chapter. In the following, all the analyses are based on sufficient dc-link voltage assumption. Moreover, the internal resistance of the coupling part is assumed to be small and can be neglected. 2 Mathematical Modeling of a Three-Phase Four-Wire Center-Split HAPF and APF From Figs. 2, the switching functions Sx for each inverter leg of the HAPF and APF can be given as: & 1 when T1x is ON and T2x is OFF Sx ¼ ð3:1Þ À1 when T2x is ON and T1x is OFF For VdcjU ¼ VdcjL ¼ 0:5Vdcj , the output voltage for each inverter leg can be expressed as: vinvjx ¼ Sx Â 0:5Vdcj ð3:2Þ The inverter line-to-neutral voltage vinvjxÀn can be expressed as: vinvjxÀn ¼ vinvjx À vn ¼ vinvjx ð3:3Þ where the neutral line voltage vn ¼ 0, the switching state of an inverter leg is independent of the switching states of the other two legs, the inverter line-toneutral voltage vinvjx for each leg is either equal to À0:5Vdcj or þ0:5Vdcj .