Summary: Repeat the simulation model established and high-frequency link inverter topology, link high frequency inverter control strategy, system simulation. Simulation results repetitive control strategy, it is possible to access to the high-frequency inverter output waveform quality link.
Keywords: High Voltage Testing Set-frequency link, an inverter, repetitive control, harmonic
Introduction L
Because of the high, current, and easy-to-use condition efficiency, power density, high-power, high-frequency bi-directional voltage source inverter, solar power inverter power source is in the field of research. High-frequency inverter power source in the model link voltage of the inverter is based on the domain model and discrete-time continuous-time domain. In order to remove the distortion of the output voltage waveform of the principle of periodic control techniques based on the analysis to consider a discrete repetitive voltage feedback, the iterative learning control. Finally, the application of PSIM simulation software for system testing was carried out on a critical analysis of the test waveform.
Mathematical model of the second inverter main circuit
Bi-directional voltage source inverter and the high-frequency diagram is shown in Figure 1. It is based on the basic transfer units. Positive and negative pulse inverter primary DC input voltage DC, is a high-frequency transformer, high frequency transformer and the main phase of the secondary side of the isolation transformer and electric transformer ratio adjustment, the same positive and negative through the high-frequency inverter RF pulse frequency demodulator has a pulse frequency, the frequency converter output filter circuit of the low-frequency pulse voltage is filtered by the filter circuit across the next higher harmonics.
Switch from inverter frequency is much higher, the high-frequency inverter power link in the main circuit model than the oscillation frequency of the LC filter. Thus, the dynamic characteristics of the inverter main decision can be equivalent to the output LC filter can be configured by the LC filter system secondary. Filtering: inductance Lf the capacity to set the Rz equivalent resistance capacitors, inductors, filters other CF. Equivalent transfer function of the inverter: H V Testing Set
Select the appropriate sampling period T, the inverter will be the equivalent discrete transfer function and hold device, zero-order transfer function may be discrete inverter:
Carrier frequency of the experiment main circuit of the inverter of 10kHz, taking into account the frequency of the output filter cut-off frequency of 1/10 to 1/5 take into account, = 2MH, CF = 6, F selection, Rz is the Lf = one. Insulating Oil Testers
MATLAB software systems can be obtained using discrete transfer function of the form:
Greater than the natural resonant frequency attenuation at the peak of the inverter no load, it is very small. PWM inverter output voltage error is from the DC side voltage fluctuation caused by the influence of the dead time load disturbance factors, such mainly. Frequency component of the error in the low frequency band, only those of low frequency error components primarily system, we have a strong suppression. Such dramatic harmonic distortion (THD%), as a steady state voltage and other indicators of steady-state error can be improved. So. Amplitude and phase compensation I shall concentrate on the low frequency band. The natural frequency can be attenuated amplitude of up to-3dB below approx.
Keywords: High Voltage Testing Set-frequency link, an inverter, repetitive control, harmonic
Introduction L
Because of the high, current, and easy-to-use condition efficiency, power density, high-power, high-frequency bi-directional voltage source inverter, solar power inverter power source is in the field of research. High-frequency inverter power source in the model link voltage of the inverter is based on the domain model and discrete-time continuous-time domain. In order to remove the distortion of the output voltage waveform of the principle of periodic control techniques based on the analysis to consider a discrete repetitive voltage feedback, the iterative learning control. Finally, the application of PSIM simulation software for system testing was carried out on a critical analysis of the test waveform.
Mathematical model of the second inverter main circuit
Bi-directional voltage source inverter and the high-frequency diagram is shown in Figure 1. It is based on the basic transfer units. Positive and negative pulse inverter primary DC input voltage DC, is a high-frequency transformer, high frequency transformer and the main phase of the secondary side of the isolation transformer and electric transformer ratio adjustment, the same positive and negative through the high-frequency inverter RF pulse frequency demodulator has a pulse frequency, the frequency converter output filter circuit of the low-frequency pulse voltage is filtered by the filter circuit across the next higher harmonics.
Switch from inverter frequency is much higher, the high-frequency inverter power link in the main circuit model than the oscillation frequency of the LC filter. Thus, the dynamic characteristics of the inverter main decision can be equivalent to the output LC filter can be configured by the LC filter system secondary. Filtering: inductance Lf the capacity to set the Rz equivalent resistance capacitors, inductors, filters other CF. Equivalent transfer function of the inverter: H V Testing Set
Select the appropriate sampling period T, the inverter will be the equivalent discrete transfer function and hold device, zero-order transfer function may be discrete inverter:
Carrier frequency of the experiment main circuit of the inverter of 10kHz, taking into account the frequency of the output filter cut-off frequency of 1/10 to 1/5 take into account, = 2MH, CF = 6, F selection, Rz is the Lf = one. Insulating Oil Testers
MATLAB software systems can be obtained using discrete transfer function of the form:
Greater than the natural resonant frequency attenuation at the peak of the inverter no load, it is very small. PWM inverter output voltage error is from the DC side voltage fluctuation caused by the influence of the dead time load disturbance factors, such mainly. Frequency component of the error in the low frequency band, only those of low frequency error components primarily system, we have a strong suppression. Such dramatic harmonic distortion (THD%), as a steady state voltage and other indicators of steady-state error can be improved. So. Amplitude and phase compensation I shall concentrate on the low frequency band. The natural frequency can be attenuated amplitude of up to-3dB below approx.
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