DSQC661 3HAC026253-001 | ABB | High frequency modulation voltage waveform

Description

DSQC661 3HAC026253-001 | ABB | High frequency modulation voltage waveform

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A 1 kW photovoltaic inverter system is designed here. Using the topology shown in Figure 1, the main parameters of DSQC661 3HAC026253-001 are: input voltage 35-75 V, output voltage 220 V, output voltage frequency 50 Hz, DC bus voltage 400 V, output power 1 kW, transformer primary turn ratio 8:96, isolated capacitor 88 μ F. The filtering inductance is 3.3 mH and 1.2 mH respectively, and the filtering capacitance is 600 μ F and 2.2 μ F.

The DSQC661 3HAC026253-001 system uses the AVR microcontroller ATMEGA64 as the main control chip. The DC/DC part of VT1 to VT4 uses IXFK180N10 MOSFET transistors, while VD1 to VD4 uses MUR8120 fast recovery diodes with a switching frequency of f=62.5 kHz. The high-frequency transformer core uses PQ50/50 and is wound with wire wrap. The DC/AC part VT5-VT8 adopts 47N60C3 MOSFET transistor, f=32 kHz.

To verify the working principle, use an oscilloscope for testing. Figure 6a shows the waveform of high-frequency modulation voltage before output filtering. DSQC661 3HAC026253-001 shows a voltage amplitude of approximately 350 V and a frequency of 50 Hz. Figure 6b shows the working waveform of the inverter with a resistive load in independent inverter mode. It can be seen that the inverter can output an ideal sinusoidal voltage of 220 V/50 Hz, and can still maintain good sinusoidal performance under load. After actual testing, the voltage THD at full load output is ≤ 3%, which meets the requirements. Figure 6c shows the working waveform of the inverter in grid connected inverter mode. It can be seen that the inverter outputs a sine current of 4.5 A/50 Hz, and the current phase lags slightly behind the grid voltage, because the data processing of the MCU takes some time. Ignoring this point, the output current is basically the same frequency and phase as the grid voltage. After actual testing, the current THD at rated power output is ≤ 5%, which meets the requirements.

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