Photovoltaic support synchronous tracking method adopting direct current bus

Abstract

The invention relates to a photovoltaic tracking support synchronous tracking control method which comprises the steps that: one direct current bus synchronously tracks a plurality of single-shaft tracking supports through one controller; each single-shaft tracking support is connected with the direct current bus only through two leads; each single-shaft tracking support can realize mechanical limit protection and accumulated error elimination, and an inclining angle sensor only needs to be arranged on one synchronously tracked single-shaft support as control feedback; two direct current buses synchronously track a plurality of double-shaft tracking supports through one controller; each double-shaft tracking support is only provided with four leads which are connected with the two direct current buses; each double-shaft tracking support can realize mechanical limit protection and accumulated error elimination; and the inclining angle sensor only needs to be arranged on one synchronously tracked double-shaft support as control feedback. The control method has strong project feasibility and high tracking precision, the initial price and the post maintenance fee of the tracking support are greatly reduced, and a wide development prospect is realized.

Description

technical field [0001] The invention relates to a method for synchronously tracking a photovoltaic support. Background technique [0002] With the maturity of technology and the reduction of cost, photovoltaic power generation has been widely used at home and abroad. According to the different forms of support, it can be divided into fixed type and automatic tracking type. The automatic tracking support can increase the power generation of the system by 10% to 50% compared with the fixed support, but the cost and maintenance cost of the automatic tracking support are also significantly higher than the fixed support. [0003] In order to reduce the initial cost, Chinese Invention Patent: A Synchronous Tracking Method for Automatically Tracking Solar Photovoltaic Generating Device Array (CN 101030741A) proposes a method for synchronously tracking photovoltaic arrays based on an AC bus. Its technical features are: (1) The AC power supply of the same frequency is used to simul...

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Problems solved by technology

[0004] The problems and deficiencies of this synchronous tracking control method are as follows: (1) Because only one of the tracking brackets is equipped with a photosensitive sensor to detect the position of the sun, the other brackets that are synchronously tracking cannot achieve closed-loop control; and the mechanical parameters of each bracket, synchronization The parameters of the motor and the wind conditions are different, causing the support to not be completely synchronously tracked, and the tracking error will accumulate, thereby greatly reducing the tracking effect; but this invention does not consider the problem of eliminating the accumulated error; and, due to the use of AC control Bus, in order to eliminate the accumulated error, it is necessary to install a position sensor on each bracket and transmit the signal to the synchronous tracking controller, which increases the cable connection between the bracket and the controller, and increases the cost for debugging and maintenance. This brings difficulty; (2) In order to ensure the safety of the tracking support, this method of synchronous tracking must install limit sensors on each support (generally 2 in each axial direction) to ensure that the support will not exceed the limit position cause loss; because the patent uses an AC control bus, these limit sensors must transmit signals to the synchronous tracking controller through additional cables, so that it can make shutdown protection and control the bracket to return to the normal operating angle range, which increases the number of brackets and The cable connection between the controllers increases the cost and brings difficulty to debugging and maintenance; (3) This synchronous tracking method uses a photosensitive sensor to detect the position of the sun, and the tracking will fail when the sensor is covered with dust or in cloudy and rainy days

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