An automatic control system for photovoltaic power station low-voltage ride-through mobile detection

Abstract

The invention provides a photovoltaic power station low-voltage ride-through movement detection automatic control system. The photovoltaic power station low-voltage ride-through movement detection automatic control system comprises a monitoring background and a communication controller, the monitoring background and the communication controller are respectively connected with an Ethernet switch, and the communication controller is connected with a PLC device, an infrared thermometer and a temperature and humidity instrument. The monitoring background sends set parameters and control commands to the PLC device, a finite-state machine of the PLC device completes parameter setting according to the set parameters, and state switching and state operation are carried out according to the switch input amount of the PLC device and the control commands. The photovoltaic power station low-voltage ride-through movement detection automatic control system is provided with the finite-state machine having six states according to the characteristics of low-voltage ride-through detection, various requirements in the detection process are flexibly met, abnormal situations possibly happening in the detection process are sufficiently considered, and the test detection reliability is guaranteed.

Description

technical field [0001] The invention relates to a system in the field of grid-connected detection of new energy power generation, in particular to an automatic control system for low-voltage ride-through mobile detection of a photovoltaic power station. Background technique [0002] Photovoltaic power generation technology has developed rapidly around the world, and a large number of grid-connected photovoltaic power stations have been established. In order to ensure that the grid-connection of photovoltaic power stations does not have a major impact on the grid and that changes in the operating status of the grid do not affect the safety of equipment in photovoltaic power stations, various countries have formulated grid-connection standards and grid-connection testing standards for photovoltaic power stations. After the organization's grid-connection inspection and obtaining the grid-connection qualification, the photovoltaic power station can be connected to the grid for o...

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Problems solved by technology

[0004] At present, the automation degree of the low-voltage ride-through mobile detection test of photovoltaic power stations is not high, and the information in the detection process cannot be fully monitored. The test process requires more human intervention, such as manual adjustment of the tap changer position, which increases the complexity of the test operation, and Risk of human error

During the low-voltage ride-through mobile detection test, there will be many switch opening and closing operations and tap changer gear lifting operations. The reliability of these operations will greatly affect the normal progress of the test and even cause damage to the test equipment. At present, photovoltaic power plants The low-voltage crossing mobile detection test process does not consider this enough

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