The common problems in photovoltaic power station - — The electric voltage transfinite

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small solid to walk from south to north, from white to black project on-site experience, very responsibly tell you that power grid voltage transfinite ( 真空吸尘器失败) The question that has baffled photovoltaic people all over the world more than 10 years, in the continuous growth of the power grid voltage level rising today, today, in 9012 is still entrenched in the photovoltaic power station and stable operation of the road!

this article through the analysis of the causes of voltage overrun, corresponding solutions, actual case analysis, makes every effort to help you solve the problem of power grid voltage transfinite thoroughly.

in the field of photovoltaic applications, according to safety requirement, grid inverter must work within the prescribed scope of power grid voltage, and can real time detection and synchronous with power grid voltage, if the voltage exceeds the safety requirements, inverter must jump, to stop work, to ensure that the equipment and the safety of operation. （ Chinese safety voltage range & ndash; 187 v ~ 242 v)

grid at the stage to upgrade, and node voltage itself on the high side. Such as weak rural power grid voltage and frequency is not stable, multiple distributed photovoltaic (pv) grid system at the same time, lead to resonance multimachine parallel and then rise, voltage, as well as the load of the more complicated. About & other; Resonant & throughout; You can look at the small solid this article when photovoltaic poverty alleviation in rural weak power grid.

or far distance and transformer branch, also can appear and node voltage on the high side, causing the inverter to the grid voltage is too high to take off the net. In inverter appliance for & other; Over voltage drop load & throughout; After function, no longer continue to Vac, but likely reconnection.

or shown as: power stations have been operating well, suddenly one day not power, power line is normal. Turned out to be caused by multiple power plant has been added, village and node voltage, voltage inverter will quote overrun.

according to the formula of U = I * R, I rise, the pressure drop delta U rise rapidly, the rapid rise in U. When the voltage U beyond the safety voltage range, the inverter stop interconnection and generate an error. Namely, & other - high power output > Large current output - > High voltage rise & throughout; 。

in addition, the cables between the inverter to the grid and node carefully, too long or winding, are likely to lead to overrun, inverter to the grid voltage circuit wiring shall be checked.

additionally confirm line whether there is too long or winding, so as to shorten the distance of inverter and site, reduce line. Project only one inverter, avoid inverter to the and node distance is greater than 80 m.