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The working principle of photovoltaic grid - connected inverter
- In the small-capacity inverter generally push-pull inverter circuit, full-bridge inverter circuit and high-frequency step-up inverter circuit three, push-pull circuit, the step-up transformer neutral plug connected to the positive power supply, two power Alternating current, the output to get AC power, due to the power transistor to ground, drive and control circuit is simple, and because the transformer has a certain leakage inductance, can limit the short circuit current, thus improving the reliability of the circuit. The disadvantage is the low utilization of the transformer, driving the emotional load is poor.s
What are the methods of photovoltaic grid-connected inverter control
- Inverter main circuit need to have a control circuit to achieve, generally have square wave and sine wave two control methods, square wave output inverter power supply circuit is simple, low cost, but low efficiency, harmonic components. Sine wave output is the development trend of the inverter, with the development of microelectronics technology, there are PWM function of the microprocessor has also come out, so the sine wave output inverter technology has matured.s
PV grid-connected inverter can directly load it?
- Grid-connected inverter is like a car file, he first detects the grid waveform, can not detect not boot, and then the PV DC modulation and consistent with the grid waveform, and then hang up.s
What is the difference between a PV grid-connected inverter and an off-grid inverter?
- Grid-connected inverter will be directly sent to the power grid, so to track the frequency of the grid, phase, the equivalent of a current source. Of course, there are some inverters called low-voltage crossing ability, you can do PQ adjustments
What is the PV inverter starting voltage
- sine wave becomes narrower and the voltage width in the center of the sine wave is widened and the switching element is always operated in a direction at a certain frequency in a half cycle, A pulse wave train (pseudo sine wave). Then let the pulse wave form a sine wave through a simple filters
Is the PV inverter a current source or a voltage source?
- For the inverter for the grid system, depending on whether the transformer can be divided into transformer-type inverter and transformer-free inverter.s
The function of photovoltaic grid - connected inverter
- Finally, a sinusoidal AC output for a grid-connected photovoltaic power generation system is generated by a low-pass filter.s
Generally a large grid-connected photovoltaic power plant will have several inverters
- Group is the use of a number of grid-connected inverter and grid-connected AC power grid, the advantage is the loss of small, low cost of the cable (because the PV cable is more expensive), eliminating the cost of the convergence box, and multiples
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