一种应用于光伏发电系统的通信系统以及光伏发电系统

Abstract

本实用新型公开了一种应用于光伏发电系统的通信系统，包括：电力线载波通信主机模块、电力线载波通信从机模块和磁环；电力线载波通信主机模块设置于光伏发电系统的逆变器中，并与磁环电性连接，逆变器和汇流箱之间通过正负直流线缆连接；磁环还与逆变器中的直流线缆的任意一极电性连接；电力线载波通信从机模块设置于光伏发电系统的汇流箱中，并与直流线缆的另一极电性连接；电力线载波通信主机模块产生用于承载通信数据的高频载波信号；磁环将高频载波信号耦合至直流线缆中，使得高频载波信号通过直流线缆传输至电力线载波通信从机模块；电力线载波通信从机模块从高频载波信号中提取出通信数据，从而实现逆变器与汇流箱之间的通信。

Claims

1. A communication system applied to a photovoltaic power generation system, characterized in that, include: Power line carrier communication master module, power line carrier communication slave module and magnetic ring; The power line carrier communication host module is installed in the inverter of the photovoltaic power generation system and is electrically connected to the magnetic ring. The inverter and the combiner box are connected by positive and negative DC cables. The magnetic ring is also electrically connected to any pole of the DC cable in the inverter; The power line carrier communication slave module is installed in the combiner box of the photovoltaic power generation system and is electrically connected to the other pole of the DC cable; The power line carrier communication host module generates a high-frequency carrier signal for carrying communication data. The magnetic ring couples the high-frequency carrier signal to the DC cable, so that the high-frequency carrier signal is transmitted to the power line carrier communication slave module through the DC cable; The power line carrier communication slave module extracts the communication data from the high-frequency carrier signal, thereby realizing communication between the inverter and the combiner box.

2. The communication system of claim 1, wherein, The power line carrier communication host module has multiple carrier channels, and the photovoltaic power generation system has multiple combiner boxes. There is a one-to-one correspondence between the multiple carrier channels and the multiple combiner boxes. When communication with a specific combiner box is required, the carrier channel corresponding to that combiner box is selected to generate a high-frequency carrier signal that carries the communication data.

3. The communication system of claim 2, wherein The carrier channel includes: a carrier chip, a power amplifier, a filter circuit, an isolation transformer, and a carrier terminal; the carrier chip is electrically connected to the power amplifier and the filter circuit respectively, the isolation transformer is electrically connected to the power amplifier and the filter circuit respectively, the isolation transformer is also electrically connected to the carrier terminal, and the carrier terminal is electrically connected to the magnetic ring; When the carrier chip sends out a high-frequency carrier signal, the high-frequency carrier signal is amplified by the power amplifier, isolated by the isolation transformer, and then output from the carrier terminal to the magnetic ring. When the carrier chip receives a high-frequency carrier signal from the outside, the high-frequency carrier signal is input from the magnetic ring to the carrier terminal, and then passes through the isolation transformer for isolation processing, and through the filter circuit for filtering processing before being input to the carrier chip.

4. The communication system of claim 2, wherein The carrier channel includes: a carrier chip, a power amplifier, a filter circuit, an RC circuit, and a carrier terminal; the carrier chip is electrically connected to the power amplifier and the filter circuit respectively, the RC circuit is electrically connected to the power amplifier and the filter circuit respectively, the RC circuit is also electrically connected to the carrier terminal, and the carrier terminal is electrically connected to the magnetic ring; When the carrier chip sends out a high-frequency carrier signal, the high-frequency carrier signal is amplified by the power amplifier in sequence, and then output from the carrier terminal to the magnetic ring after passing through the RC circuit. When the carrier chip receives a high-frequency carrier signal from the outside, the high-frequency carrier signal is input from the magnetic ring to the carrier terminal, passes through the RC circuit in sequence, is filtered by the filter circuit, and is then input to the carrier chip.

5. The communication system of any of claims 2-4, wherein, The upper-level monitoring system connects to the PLC signal processing circuit via an RS485 interface. The PLC signal processing circuit selects the carrier channel that needs to operate based on the service message.

6. The communication system of claim 5, wherein, The power line carrier communication host module encodes the communication data into the high-frequency carrier signal using digital modulation technology.

7. The communication system of claim 6, wherein, The power line carrier communication slave module extracts the communication data from the high-frequency carrier signal using digital demodulation technology.

8. The communication system of claim 7, wherein, The digital modulation technique is any one of orthogonal frequency division multiplexing, frequency shift keying, and phase shift keying.

9. The communication system of claim 8, wherein, The frequency band of the high-frequency carrier signal is a narrowband band of 40kHz to 500kHz or a wideband band of 1MHz to 30MHz.

10. A photovoltaic power system, characterized by, include: Photovoltaic modules, combiner boxes, inverters, and the communication system as described in claims 1-9; The photovoltaic module converts solar energy into direct current (DC), the combiner box combines the DC power and sends it to the inverter, and the inverter converts the DC power into alternating current (AC) and sends it to the power grid.

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