Standby control method of photovoltaic inverter
A technology of photovoltaic inverter and control method, which is applied in the direction of photovoltaic power generation, output power conversion device, high-efficiency power electronic conversion, etc., and can solve the problems of shortening the service life of devices such as contactor switch tubes, power grid impact, and DC voltage drop, etc. problem, to avoid the failure to restore the running state in time, prolong the service life, and avoid the effect of frequent switching
Active Publication Date: 2016-01-20
SICHUAN INJET ELECTRIC CO LTD
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Problems solved by technology
In the case of insufficient sunlight, especially in the early morning, evening and rainy weather, due to the relatively low DC input power, even if the photovoltaic inverter outputs a very small power, the DC voltage will be pulled down quickly and cause shutdown
If the corresponding treatment is not done, the photovoltaic inverter is controlled to be in the standby state under certain conditions, and the photovoltaic inverter will frequently switch between running and shutting down during this period, which will not only shorten the service life of the contactor switch tube and other devices , will also have a certain impact on the power grid
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[0014] The present invention will be further described in detail below in conjunction with test examples and specific embodiments. However, it should not be understood that the scope of the above subject matter of the present invention is limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.
[0015] The standby control method of the photovoltaic inverter of the present invention, under the operation of the photovoltaic inverter, firstly judges whether the standby trigger condition is met, and if the standby trigger condition is satisfied, the photovoltaic inverter is controlled to be in the standby state, and the standby time length is different according to the standby times And change, standby time = standby time base value × standby times. After the standby time is reached, the photovoltaic inverter will switch from the standby state to the running state.
[0016] Spe...
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The invention discloses a standby control method of a photovoltaic inverter. In the running state of the photovoltaic inverter, if the DC input voltage or DC input power of the photovoltaic inverter meets the trigger condition of standby, the photovoltaic inverter is controlled to be in standby State, the current standby time is determined according to the standby times, the more standby times, the longer this standby time. In the standby control method of the photovoltaic inverter of the present invention, the standby time length of the photovoltaic inverter is determined according to the number of standby times. The frequent switching of the contactor avoids the impact of the grid caused by the frequent connection of the state and shortens the service life of the contactor switching device.
Description
technical field [0001] The invention relates to the technical field of photovoltaic inverters, in particular to a standby control method for photovoltaic inverters. Background technique [0002] A photovoltaic inverter is a power conditioning device composed of semiconductor devices that converts the DC power of a solar panel into AC power. In the case of insufficient sunlight, especially in the early morning, evening and rainy weather, due to the relatively low DC input power, even if the photovoltaic inverter outputs a very small power, the DC voltage will be pulled down rapidly and cause shutdown. If the corresponding treatment is not done, the photovoltaic inverter is controlled to be in the standby state under certain conditions, and the photovoltaic inverter will frequently switch between running and shutting down during this period, which will not only shorten the service life of the contactor switch tube and other devices , will also bring a certain impact on the po...
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IPC IPC(8): H02M1/36H02J3/38
CPCY02B70/10Y02E10/56
Inventor 刘天羽陈超
Owner SICHUAN INJET ELECTRIC CO LTD