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Figure 616 A series passive filter
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Low-pass broadband filters Multiple stages of both series and shunt fil-
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ters are often required in practical applications For example, in shunt filter applications, a filter for blocking a seventh-harmonic frequency would typically require two stages of shunt filters, the seventh-harmonic filter itself and the lower fifth-harmonic filter Similarly, in series filter applications, each frequency requires a series filter of its own; thus, multiple stages of filters are needed to block multiple frequencies In numerous power system conditions, harmonics can appear not only in a single frequency but can spread over a wide range of frequencies A six-pulse converter generates characteristic harmonics of 5th, 7th, 11th, 13th, etc Electronic power converters can essentially generate time-varying interharmonics covering a wide range of frequencies Designing a shunt or series filter to eliminate or reduce these widespread and time-varying harmonics would be very difficult using shunt filters Therefore, an alternative harmonic filter must be devised A low-pass broadband filter is an ideal application to block multiple or widespread harmonic frequencies Current with frequency components below the filter cutoff frequency can pass; however, current with frequency components above the cutoff frequency is filtered out Since this type of low-pass filter is typically designed to achieve a low cutoff frequency, it is then called a low-pass broadband filter A typical configuration of a low-pass broadband filter is shown in Fig 617 In distribution system applications, the effect of low-pass broadband filters can be obtained by installing a capacitor bank on the low-voltage side of a transformer as shown in Fig 618a The size of the capacitor bank would have to be so selected to provide the desired cutoff frequency when combined with the transformer leakage inductance and the system impedance It is then capable of preventing harmonics above the cutoff frequency from penetrating the high-voltage side of the transformer Since the cutoff frequency can be sometimes quite low, the size of the capacitor bank may be fairly large This will result in a significant voltage rise Should the voltage remain high, a voltage regulator or transformer load tap changer (LTC) must be used to lower the voltage to an acceptable level In a substation serving multiple feeders, a line reactor and voltage regulator can be installed at the beginning of the feeder to isolate the portion of the system subject to high voltage This arrangement will
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Figure 617 A low-pass broad-
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Figure 618 A low-pass broadband filter application in power service for industrial
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systems Filter arrangement in a substation with (a) dedicated and (b) multiple feeders
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allow voltage levels at other feeders to be maintained at normal values The combination of the transformer leakage inductance, the line reactor, the voltage regulator, and the capacitor bank yields the desired cutoff frequency Figure 618b depicts this arrangement In industrial system applications, commercial low-pass broadband filters have been used to prevent harmonics produced by nonlinear loads from entering the ac system The typical design is illustrated in Fig 61910 Figure 620 shows a typical system intended for this application A line reactor installed in series with the main ac line is used to provide an electrical separation between the ac system and the nonlinear load A capacitor bank is installed in shunt to form a low-pass broadband filter
Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
Applied Harmonics Applied Harmonics 259
configuration Since the presence of the capacitor bank increases the voltage at the input of the ASD, a buck transformer is needed to bring the voltage at the line reactor output down to a level where the voltage at the capacitor is acceptable The optimum performance of a low-pass broadband filter in ASD applications is obtained when there is no series inductor between the filter capacitor banks and the ASD dc bus capacitor Any impedance in between reduces the charging capability of the dc bus capacitor since it is charged from the filter capacitor The cutoff frequency for a low-pass broadband filter for ASD applications is typically designed at a low harmonic frequency, such as at
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