Photovoltaic reverse power control and protection system

Abstract

The invention provides a photovoltaic reverse power control and protection system which is applied to a solar photovoltaic power generation system. On the current market, the existing reverse relay protector only can control the reverse power in a certain range. The reverse power control and protection system comprises a reverse power collector, a reverse power monitoring system and a reverse power control system, wherein the reverse power collector is used for collecting the information of a photovoltaic power generation system and the information of a load in real time, and transmitting the information to the monitoring system in real time to be processed; and the reverse power controller is used for receiving the instruction output signal of the monitoring system to control the operation of the photovoltaic power generation system. When the photovoltaic power generation system has reverse current which is transferred into a public supply network, all sub-power generation systems of the photovoltaic power generation system are immediately cut off to be combined to the grid, and the power consumption of the public supply network and the power consumption of the load are collected simultaneously, so that each photovoltaic subsystem intelligently puts into an operation state or a halted state to be automatically matched with the load at the user side. In the drawing, part 1 is the reverse power collector, part 2 is the reverse power monitoring system, and part 3 is the reverse power control system.

Description

Technical field [0001] The invention relates to a photovoltaic reverse power control and protection technology, which is applied to a solar photovoltaic power generation system. Background technique [0002] At present, the rapid development of the domestic solar photovoltaic power generation market has put forward new requirements and challenges for solar photovoltaic power generation systems. In order to protect the safety and stability of the public power grid, most of the grid-connected solar photovoltaic power generation systems are required to be non-reverse current systems. In order to ensure that the photovoltaic power generation system does not send power back into the public grid, the photovoltaic power generation system must have an anti-backflow control protection device. Most of the current market uses anti-backflow relay protection. This device cannot avoid the phenomenon of reverse power at all. The reverse power is controlled within a certain range, and there...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the electricity generated by the photovoltaic system cannot be consumed in a timely manner, and the problem of reverse current transmission into the public grid occurs, and reduce the impact of the photovoltaic power generation system on the safety of the public grid, the technical solution adopted by the present invention to solve this technical problem is:

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