Solar Power Inverter With MPPT Controller

TG series solar power inverter with MPPT controller 12v 24v 48v

      Principle analysis of power frequency machine and high frequency machine

    In the power frequency inverter circuit, the three-phase AC input of the main circuit is connected to the rectifier composed of three SCR bridge arms through the commutation inductance, and then converted into a DC voltage, and the output DC voltage value is adjusted by controlling the conduction angle of the rectifier bridge SCR. . Since the SCR is limited to a semi-controlled device; the control system can only control the turn-on point. Once the SCR is turned on, even if the gate driver withdraws the ridge, it cannot be turned off. It can only be turned off naturally after its current is zero, so its turn-on and Turn-off is based on a power frequency cycle. There is no high-frequency turn-on and turn-off control. Since the SCR rectifier is a step-down rectifier, the AC voltage of the DC bus voltage output by the inverter is lower than the input AC voltage. To make the output phase voltage can obtain a constant 220V voltage, a step-up isolation transformer must be added to the inverter output.

      In contrast, high-frequency inverter rectification belongs to boost rectification, and the voltage of the output DC bus is higher than the peak value of the input line voltage, which is generally about 800V. If the battery is directly connected to the bus, the standard battery section is required. The number needs 67 knots, which brings great restrictions to practical applications.

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