Alternating current can be converted into direct current using rectifier electricity, but in three-phase electricity, this DC voltage or current contains voltage or current ripple with a frequency of six times the frequency of the power supply. In addition, the inverter inverter will also generate ripple voltage or current due to output and carrier frequency, which in turn will affect the quality of DC voltage or current. Therefore, in order to obtain high-quality DC voltage or current from the inverter and control electricity, the DC voltage or current must be filtered to reduce the ripple of the voltage or current.
The DC link refers to the filter electricity plugged in between the DC power supply and the inverter, and the difference in its structure will have different effects on the function of the converter: where the inductive structure is selected, the input current ripple is small, similar to the nature of the current source; Where the capacitive structure is selected, the voltage ripple at the input terminal is small, similar to the nature of the voltage source.
For voltage inverters, the output of the rectifier is the DC voltage, and the DC central power is filtered by the large electrolytic capacitor. As for the current type inverter, the output of the rectifier is the DC current, and the central current is filtered by the large inductance.
Regarding the three-phase three-wire V series inverter (hereinafter referred to as the 220V series), U=220V; For the 440V series, U=440V.
Assuming that the electrical operation is already in a steady state, the voltage across the capacitor is shown in Figure 2, and the capacitor voltage reaches its maximum value at time t2. After that, because the supply voltage is less than the capacitor voltage, the capacitor starts to discharge; At time T3, when the power supply voltage drops to the minimum value, the capacitor voltage is still greater than the power supply voltage, and the capacitor continues to discharge: at time T4, the power supply voltage is just equal to the capacitor voltage, after which the power supply charges the capacitor. At time t4, the capacitance voltage is equal to UPV (1-a%).
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