A method of photovoltaic grid-connected inversion
An inverter and photovoltaic technology, which is used in photovoltaic power generation, adjustment of electrical variables, and conversion of irreversible DC power input into AC power output. It can solve the problems of increasing system heat, low reliability, waste of solar energy resources, etc. Effects of Harmonic Pollution, Safety and Increased Overload Capability
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[0025] See Figures 1 and 2.
[0026] The main circuit adopts PWM DC / AC bridge inverter topology, 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 component of the circuit to realize PWM current control; DC 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, which are DSP Provides a current sampling signal. The power module of the charging and discharging main circuit adopts the IPM module, which integrates drive 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 an...
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