On-line switching method, device and system for a photovoltaic power generation unit
A photovoltaic power generation, switching technology, applied in the direction of two-wire DC circuit, etc., can solve problems affecting the reliable operation of the power supply system, and achieve the effects of improving economic feasibility, reducing inrush current, and reducing demand
Active Publication Date: 2016-08-24
BEIJING ETECHWIN ELECTRIC
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Problems solved by technology
If the collection of photovoltaic panels, combiner boxes, and DC busbar grid-connected devices is called a photovoltaic power generation unit, due to reasons such as maintenance or troubleshooting, some photovoltaic power generation units in the DC power supply system will temporarily or Long-term separation from the public DC busbar, when the photovoltaic power generation unit needs to be re-switched to the photovoltaic DC power generation system, the zero-voltage capacitance in the photovoltaic power generation unit will generate a huge inrush current, which will affect the reliable operation of the entire power supply system
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[0031] The method, device and system for on-line switching of photovoltaic power generation units provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0032] figure 1 A schematic flow chart of an online switching method for a photovoltaic power generation unit provided by an embodiment of the present invention; figure 1 As shown, the embodiment of the present invention includes the following steps:
[0033] Step 101: Obtain the bus voltage of the DC bus and the output voltage of the DC-DC converter.
[0034] Step 102: Calculate the voltage difference between the bus voltage and the output voltage of the DC-DC converter.
[0035] Step 103: Compare the magnitude of the voltage difference with a preset value, if the magnitude is smaller than the preset value, go to step 104, if the magnitude is greater than or equal to the preset value, go to step 105.
[0036] Step 104: Switching the photovoltaic...
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The invention provides an online switching method, device and system of a photovoltaic power generation unit, the method comprising obtaining the bus voltage of the DC busbar and the output voltage of the DC-DC converter; calculating the bus voltage and the output voltage of the DC-DC converter voltage difference; compare the amplitude of the voltage difference with the preset value; if the amplitude is less than the preset value, switch the photovoltaic power generation unit to the DC busbar through the buffer circuit; if the amplitude is greater than or equal to the preset value, then The photovoltaic power generation unit enters the state of waiting for switching. The embodiment of the present invention can reduce the inrush current when the photovoltaic power generation unit is switched on and off, so that the photovoltaic power generation unit separated from the DC busbar can be stably put into the photovoltaic DC power supply system online, thereby improving the economic feasibility of the public DC busbar power supply system.
Description
technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to an online switching method, device and system for photovoltaic power generation units. Background technique [0002] In the photovoltaic DC power supply system, after the photovoltaic panels are combined through the combiner box, they are connected to the public DC busbar through the photovoltaic DC grid-connected device. If the collection of photovoltaic panels, combiner boxes, and DC busbar grid-connected devices is called a photovoltaic power generation unit, due to reasons such as maintenance or troubleshooting, some photovoltaic power generation units in the DC power supply system will temporarily or Long-term separation from the public DC busbar, when the photovoltaic power generation unit needs to be re-switched to the photovoltaic DC power generation system, the zero-voltage capacitance in the photovoltaic power generation unit will generate a huge i...
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IPC IPC(8): H02J1/06
Inventor 张国驹刘炳张一博唐挺
Owner BEIJING ETECHWIN ELECTRIC