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This paper presents a method to expand the bandwidth of conventional class-F power amplifier. Analysis indicates that small characteristic impedance of quarter-wave shorted-circuit transmission line in the harmonic control network is beneficial for PA design, as the second harmonic impedance varies less with frequency variation. A 10W GaN packaged transistor is used to verify the proposed method....
This paper presents mathematical modeling procedure of three-phase grid-connected photovoltaic inverter. This paper presents synchronous PI current control strategy and the method for adjuster design. The typical waveforms of grid voltage, current and harmonics of grid current are carried out in a 100kW photovoltaic inverter, which can provide some guidelines for engineers to analyze, design and implement.
This paper presents mathematical modeling procedure of three-phase grid-connected photovoltaic inverter. It presents synchronous PI current control strategy and the method for adjuster design. The typical waveforms of grid voltage, grid current and harmonics of grid current are carried out on a 100 kW photovoltaic inverter, which can provide some guidelines for engineers to analyze, design and implement.
In this paper, internal fault protective relay maloperation of assembling capacitor bank caused by switching-on transient harmonics is analyzed. Mathematical expressions describing the adaptive settings of single-wye, dual-wye and bridge connections are given. The realistic action of internal fault protections under high amplitude harmonic conditions is possibly very different from theoretic setting...
Instead of ordinary shunt capacitor banks, assembling capacitor are more extensively used in power system for voltage support and power factor correction due to its larger reactive power compensation per bank as well as free-maintenance. However, just owing to large capacitance and special internal configuration, it may aggravate system issue of harmonic amplification and thus may contrarily further...
In this paper, a polynomial model was used to describe the phase of a frequency-shifted signal and the harmonic wavelet. The sine function was applied to the signal as a window function. The coefficient of the modified harmonic wavelet transform was used as a target function. We use the anneal-simulation arithmetic in finding the global maximum value of the target function. Then the parameter of the...
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