Starting method for photovoltaic grid-connected power generating system and device
A technology for grid-connected power generation and starting devices, applied in photovoltaic power generation, single-network parallel feeding arrangement, etc., can solve problems such as DC voltage waste, and achieve the effect of improving effectiveness and reliability
Active Publication Date: 2012-05-30
BYD CO LTD
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Problems solved by technology
[0004] In order to solve the above-mentioned technical problem that the DC voltage converted by the solar panel cannot be automatically controlled and the inversion of the inverter is wasted, the present invention provides a starting device for a photovoltaic grid-connected power generation system, which can start automatically and make full use of solar energy The DC voltage converted by the battery panel improves the effectiveness and reliability of the operation of the photovoltaic grid-connected power generation system
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[0021] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0022] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Herein, the same reference numerals denote the same constituents.
[0023] Such as figure 1 As shown, the photovoltaic grid-connected power generation system of the present invention includes a PV source 100 , an inverter 200 , a transformer 300 and a grid 500 . The starting device includes a DSP (digital signal processing) processor (not shown) and a starting switch 400 .
[0024] Such as figure 1 As shown, the inverter 200 includes six...
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The invention provides a starting method for a photovoltaic grid-connected power generating system and a device. The photovoltaic grid-connected power generating system comprises a PV (photovoltaic) source, an inverter, a transformer and a power grid. The starting method includes a starting switch providing step, a direct-current voltage detecting step and a starting step, wherein a starting switch is arranged between the transformer and the power grid in the starting switch providing step; voltage of two ends of the PV source is detected in the direct-current voltage detecting step and used as a first direct-current voltage value, the first direct-current voltage value is compared with a preset direct-current voltage value, and if the first direct-current voltage value is larger than or equal to the preset direct-current voltage value, the starting step can be carried out, otherwise, the direct-current voltage detecting step is repeated after a preset time interval; and the starting switch is switched on in the starting step.
Description
technical field [0001] The invention relates to a starting method for a photovoltaic grid-connected power generation system and a starting device for a photovoltaic grid-connected power generation system. Background technique [0002] As we all know, photovoltaic power generation is an important technical means to solve the current environmental pollution and energy crisis faced by mankind. At present, the most critical technical issues of photovoltaic power generation are still cost reduction and conversion efficiency. In the photovoltaic grid-connected power generation system, the DC power of the PV source is first converted into AC power through an inverter (such as an IGBT inverter), and then the voltage is boosted by a transformer and connected to the grid. Research and implementation of softening strategy of DSP-based sensorless brushless DC motor control system (Explosion-proof Motor, Issue 03, 2006) discloses a three-phase full-bridge inverter. [0003] In the prio...
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IPC IPC(8): H02J3/38
CPCY02E10/563Y02E10/56
Inventor 王营辉尹雪芹吴钰萍
Owner BYD CO LTD