Alternating-current header box adopting carrier communication and photovoltaic power station

Abstract

The invention relates to an alternating-current header box adopting carrier communication and a photovoltaic power station. The alternating-current header box comprises an intelligent acquisition unit, a busbar, an input breaker, a current transformer and a lightning protector, wherein the intelligent acquisition unit is used for acquiring a signal, then loading the acquired signal to the current of a power supply cable in a high-frequency signal mode and then transmitting the current by use of power; the low voltage side of a box transformer substation is provided with a carrier wave module and a communication management unit; the carrier wave module is used for decomposing the high-frequency signal from the current of the power supply cable; and the acquired signal is transmitted to a monitoring system by virtue of the communication management unit. According to the alternating-current header box, a power-line carrier technology is adopted for transmitting data, so that the alternating-current header box is simple in structure, relatively low in cost, stable in performance and convenient in system overhaul and maintenance.

Description

technical field [0001] The invention belongs to the technical field of electric power, and in particular relates to an AC combiner box using carrier communication and a photovoltaic power station with the AC combiner box. Background technique [0002] In medium-sized or large-scale solar power generation systems, the overall efficiency of photovoltaic power stations is about 1-4% higher than that of photovoltaic power stations using centralized inverters due to the use of multi-channel MPPT technical routes by string photovoltaic inverters. , Therefore, more and more large-scale photovoltaic power plants also tend to use string photovoltaic inverters. The AC combiner box is used in conjunction with the string photovoltaic inverter to complete the connection between the inverter and the box-type transformer. [0003] Conventional intelligent AC combiner boxes use RS485 communication, and RS485 communication twisted pairs need to be laid separately during construction. In ph...

AI Technical Summary

Problems solved by technology

In photovoltaic power stations, communication cables are conventionally buried directly, and communication cable trenches need to be excavated, and the overall workload of communication cable laying is relatively large

Moreover, when a communication cable breakage accident occurs, due to the direct burial method of laying, it is necessary to dig out the cable trench where the broken communication cable is located, and then repair the broken communication cable. It can be seen that the communication cable in this technology Once a failure occurs, it is difficult to recover

[0004] In addition to the RS485 wired communication method, wireless communication technology can also realize the data transmission of the AC combiner box. Although it has the advantage of not requiring separate wiring, the signal transmission is easily blocked by obstacles, the performance is unstable, the transmission distance is limited, and the cost is relatively high. high

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