A method of photovoltaic grid-connected inversion
An inverter and photovoltaic technology, which is applied in the direction of photovoltaic power generation, adjustment of electric variables, irreversible DC power input conversion to AC power output, etc., can solve the problems of increasing system heat generation, low reliability, waste of solar energy resources, etc., and achieve reduction Effects of Harmonic Pollution, Safety and Improvement of Overload Capability
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[0025] See figure 1 , 2 .
[0026] The main circuit adopts the topology of the PWM DC / AC bridge inverter, and the isolation transformer is used to isolate the voltage and voltage level conversion; the main function of the reactor La is to filter and store the reactive components of the circuit to achieve PWM current control; The filter is the second harmonic current filtering branch on the DC side; the AC filter is the LC filter link at the end of the grid side, which makes the sine wave grid-connected current smoother; IA, IB, and ID are high-precision Hall current sensors and are DSP Provide current sampling signal. The charging and discharging main circuit power module adopts the IPM module, which integrates driving and protection, and has high reliability. The discharge current obtained by the ID and the terminal voltage of the solar cell array are converted by A / D and sent to the software protection unit to realize the overvoltage protection of the solar cell array and the i...
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