Tracking control method and system for photovoltaic power station

Abstract

The invention discloses a tracking control method and system for a photovoltaic power station. The photovoltaic power station comprises an array photovoltaic module for converting the luminous energy into a direct current for outputting and an inverter for converting the direct current into an alternating current and generating power in a grid-connected mode with a public supply system. The method includes: a current power supply environment state of a public supply system is detected; when the power supply environment of the public supply system is normal, switching to a first power supply line with an input terminal connected in parallel to an output terminal of the inverter and a connecting terminal of the public supply system is realized to provide power for a photovoltaic tracking controller; when the power supply environment of the public supply system is abnormal, switching to a second power supply line with an input terminal connected in parallel to an input terminal of the inverter and a connecting terminal of the array photovoltaic module is realized to provide power for the photovoltaic tracking controller; and one of the first power supply line and the second power supply line provides power, so that the photovoltaic tracking controller controls the direction and angle of the array photovoltaic assembly. Therefore, field cable laying is reduced substantially; and the tracking system becomes flexible and stable when facing a changeful station environment and thus the communication quality becomes reliable.

Description

technical field [0001] The invention relates to the field of photovoltaic power station control, in particular to a tracking control method and system for a photovoltaic power station. Background technique [0002] As we all know, the inverter is connected to multiple tracker systems at the photovoltaic power station site. In the existing power supply mode, each tracker control box needs to lay a long cable to take power from the photovoltaic power station grid, which increases the workload of on-site construction. , so that the cost of work increases and the cable is prone to problems in the harsh power station environment, so that the photovoltaic tracking controller cannot work normally, and the real-time monitoring of data information cannot be achieved. [0003] Photovoltaic tracking controller mainly detects the data information of solar changes, and transmits the information to the central controller, so as to control the working status of the array photovoltaic modul...

AI Technical Summary

Problems solved by technology

This often results in poor communication quality between the communication box and the control box, coupled with the brutal construction on site, the cable is very easy to be interrupted, which puts a lot of pressure on the data collector, and the cost of the communication box is relatively high

[0004] In addition, multiple control boxes and communication boxes are interconnected, and the signal reflection of the control box is serious. This signal reflection will also interfere with the normal communication between multiple control boxes and communication boxes. To solve this problem, it is usually necessary to Or increase the source matching resistance at the communication box end, which will undoubtedly increase the design difficulty of the entire control box or communication box, and increase the cost; if one of the multiple control boxes fails, the signal transmitted to the communication box through the bus is 0, this will cause the entire communication bus from the control box to the communication box to be short-circuited and unable to work

Images