Abstract
The purpose of this paper is to study the influence of the uncontrolled rectifier circuit on the generator’s output waveform when considering the commutation overlap angle. Taking the nonsalient permanent magnet (PM) generator directly connected with the uncontrolled rectifier circuit as an example, the equivalent circuit of the generator with rectifier load is established, and the commutation process of the rectifier circuit is analyzed when the effect of the commutation overlap angle is considered. The output waveforms of generator’s output side are obtained by analytical method, circuit simulation method, field-circuit coupled simulation method, and experimental method. The validity of the analysis methods is demonstrated by comparison. According to the results of analytical analysis, we know the characteristics of the output waveform under the influence of the commutation overlap angle. The existence of the commutation overlap angle will cause the voltage waveform to concave or convex, prolong the conduction time of the winding, and result in phase difference between the voltage waveform and current waveform. The influence of synchronous inductance and extra inductance on the output waveforms and harmonic distortion rate is analyzed. The research of this paper provides a theoretical basis for improving the output waveform of the generator with rectifier load.
Highlights
Distributed power supply system as the main power supply or standby power supply is widely used in numerous fields such as marine electric propulsion, wind power generation, aviation, emergency, mine, and petrochemical
The widely used uncontrolled rectifier will bring harmonic pollution to the power grid side, and the power factor is low, and the existence of a large number of harmonics will lead to an Mathematical Problems in Engineering increase in power line and equipment loss, reduce the efficiency of power generation, transmission, and electrical equipment, and cause equipment vibration and noise worse [6,7,8], so how to improve the waveforms’ quality of the power grid side in the uncontrolled rectifier circuit has been a research hotspot
In the work by Zhang and Wu [9], the working characteristics of the electric excitation synchronous generator with uncontrolled rectifier load are analyzed and the AC side voltage and current waveforms are obtained by numerical simulation
Summary
Distributed power supply system as the main power supply or standby power supply is widely used in numerous fields such as marine electric propulsion, wind power generation, aviation, emergency, mine, and petrochemical. In the work by Zhang and Wu [9], the working characteristics of the electric excitation synchronous generator with uncontrolled rectifier load are analyzed and the AC side voltage and current waveforms are obtained by numerical simulation. In the study by Meyer et al [14], current waveform characteristics of the power grid side are analyzed by Simulink simulation when the electric vehicle charging pile adopts the uncontrolled rectifier method, and the current waveform quality is improved by using the harmonic compensation device. The main research methods of AC side output characteristics of the distributed DC power supply system are mainly analyzed method, circuit simulation method, field-circuit coupled simulation method, and experimental method. is paper takes the nonsalient PM generator with the uncontrolled rectifier circuit as an example, and the output voltage and current waveforms of the generator are obtained by using the above methods. e influence mechanism of generator’s output waveforms, which is influenced by the rectifier circuit, is analyzed with the solving process of the analytic method, which provides the necessary conditions for studying how to improve the output waveforms of the distributed DC power supply. e comparison of the voltage and current waveforms obtained by each method shows the relative consistency of each method, and the advantages and limitations of each approach are illustrated
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