Dual-input photovoltaic inverter ground insulation resistance detection system, method and device
A photovoltaic inverter and insulation resistance technology, applied in the direction of impedance measurement, etc., can solve the problem of high complexity of the detection scheme, and achieve the effect of simplifying the calculation process and simplifying the detection system
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Embodiment 1
[0038] Embodiment 1 of the present invention provides a detection system for the ground insulation resistance of a dual-input photovoltaic inverter, such as figure 2 shown, including:
[0039] Additional resistance R 0 and diode D 0 , the additional resistor R 0 and diode D 0 After being connected in series, it is connected between the second input positive pole PV2+ of the dual-input photovoltaic inverter and the ground wire PE;
[0040] Three voltage sampling circuits are used to detect the voltage V of the first input positive pole PV1+ to the common input negative pole PV- PV1+ , The voltage V of the second input positive pole PV2+ to the common input negative pole PV- PV2+ and the ground wire PE to the voltage V of the common input negative pole PV- PE ;
[0041] The controller is connected to the switch tube of the first input boost circuit BOOST1 in the dual input photovoltaic inverter, the switch tube of the second input boost circuit BOOST2 and three voltage s...
Embodiment 2
[0101] Correspondingly, the embodiment of the present invention also provides a method for detecting the insulation resistance of a dual-input photovoltaic inverter to ground, such as Figure 7 shown, including:
[0102] Step 701, control the switch tubes in the first input boost circuit and the second input boost circuit in the dual-input photovoltaic inverter to turn off, and obtain the voltage of the positive pole of the first input to the negative pole of the common input, and the voltage of the second input boost circuit. The voltage of the input positive pole to the common input negative pole and the first voltage of the ground wire to the common input negative pole;
[0103] Step 702, control the switching tube in the first input boost circuit of the dual-input photovoltaic inverter to turn off, and the switch tube in the second input boost circuit to turn on, so that the positive pole of the second input and the negative pole of the common input Short circuit, obtain ...
Embodiment 3
[0142] Based on the same inventive concept, according to the detection method for the ground insulation resistance of the dual input photovoltaic inverter provided by the above embodiments of the present invention, correspondingly, the embodiment of the present invention also provides a dual input photovoltaic inverter ground insulation resistance The detection device, the schematic diagram of its structure is shown in Figure 8 shown, including:
[0143] The acquisition unit 801 is used to control the switch tubes in the first input boost circuit and the second input boost circuit in the dual-input photovoltaic inverter to be turned off, and acquire the voltage of the positive pole of the first input to the negative pole of the common input, The voltage of the positive pole of the second input to the negative pole of the common input and the first voltage of the negative pole of the ground wire to the negative pole of the common input; control the switching off of the switchi...
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