Protective device for photovoltaic power generation system
A photovoltaic power generation system and protection device technology, applied in the direction of protection against overcurrent, etc., can solve the problems of inability to play a protective role, potential safety hazards, and high cost, achieve reliable protection, improve working life, and suppress surge impact. the effect of the ability
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Embodiment 1
[0021] The photovoltaic power generation system protection device in this embodiment includes an overcurrent protection device and an energy storage element. The overcurrent protection device is connected in series between the photovoltaic module and the DC side of the photovoltaic inverter. The energy storage element is connected in parallel between the photovoltaic module and the DC side of the photovoltaic inverter.
[0022] In practical applications, the overcurrent protection device includes a fuse and an air switch, and the energy storage element includes a capacitor element and an energy storage battery. like Figure 4 As shown, in this embodiment, fuses are selected as overcurrent protection devices, and capacitors are selected as energy storage components. PVAray1 is a simplified photovoltaic module array, 401 is a combiner box, 402 is a photovoltaic inverter, fuse F1+, fuse F1-, and capacitor C1 are installed in the combiner box 401, and fuse F and capacitor C2 are...
Embodiment 2
[0025] The photovoltaic power generation system protection device in this embodiment includes an overcurrent protection device and an energy storage element. The overcurrent protection device is connected in series between the photovoltaic module and the DC side of the photovoltaic inverter. The energy storage element is connected in parallel between the photovoltaic module and the DC side of the photovoltaic inverter.
[0026] like Figure 5 As shown, in this embodiment, fuses are selected as overcurrent protection devices, and capacitors are selected as energy storage components. PVAray1-PVArayn are all photovoltaic module arrays, 501 is a combiner box, at the output end of each group of photovoltaic modules, that is, the input end of combiner box 501, fuses are connected in series, and capacitors are connected in parallel between positive and negative electrodes.
[0027] Because the internal resistance of the capacitor is very small, it can be regarded as a voltage sourc...
Embodiment 3
[0029] The photovoltaic power generation system protection device in this embodiment includes an overcurrent protection device and an energy storage element. The overcurrent protection device is connected in series between the photovoltaic module and the DC side of the photovoltaic inverter. The energy storage element is connected in parallel between the photovoltaic module and the DC side of the photovoltaic inverter.
[0030] like Figure 6 As shown, in this embodiment, fuses are selected as overcurrent protection devices, and capacitors are selected as energy storage components. PVAray1-PVArayn are all photovoltaic components, 601 is a combiner box, only the output terminal of combiner box 601 has added capacitance.
[0031] It can be analyzed that when there is a short circuit at the CD end, it can still play an effective protective role. In addition, when a short-circuit fault occurs on the input side of the photovoltaic inverter in the subsequent stage, due to the exi...
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