A multifunctional intelligent dial-up power distribution system for distributed photovoltaic power station

Abstract

The invention discloses a multifunctional power failure intelligent dialing alarm power distribution system of a distributed type photovoltaic power station. The system comprises a power distribution box body, an automatic dialer, a metering box body and a residual current monitoring box body, wherein the automatic dialer is arranged inside the box body; a residual current automatic reclosing lock circuit breaker is arranged inside the residual current monitoring box body; and the power distribution box body, the metering box body and the residual current monitoring box body are connected in series through an alternative-current cable. The system is characterized in that the inlet end of the power distribution box body is connected with the alternative-current wiring end of a photovoltaic inverter through an alternative-current cable; the outgoing end of the power distribution box body is connected with the inlet end of the metering box body through another alternative-current cable; the outgoing end of the metering box body is connected with the residual current monitoring box body through another alternative current cable; and the outgoing end of the residual current monitoring box body is connected with a national grid low-voltage side (380V / 220V) through another alternative-current cable. According to the invention, when a power distribution network of the grid system is in power failure, a generating unit and commercial power can be automatically disconnected, so that the labor cost is reduced, and the security coefficient is higher.

Description

technical field [0001] The invention relates to the technical field of electric power equipment, in particular to a multifunctional intelligent dial-up power distribution system of a distributed photovoltaic power station. Background technique [0002] At present, the fault of the distribution network in the power grid system may occur at any time. As a distributed power generation unit, the distributed photovoltaic power station is not convenient for centralized management. If the repair personnel artificially disconnect the access point of each distributed photovoltaic power station, it is inevitable Negligence will inevitably waste time, increase workload, and affect the repair time of power grid system and distribution network. Although there is an anti-islanding function inside the photovoltaic inverter, it is inevitable that the equipment will be in disrepair for a long time and the line will be aging, and some functions will lose the protection function. The failure ...

AI Technical Summary

Problems solved by technology

[0002] At present, the fault of the distribution network in the power grid system may occur at any time. As a distributed power generation unit, the distributed photovoltaic power station is not convenient for centralized management. If the repair personnel artificially disconnect the access point of each distributed photovoltaic power station, it is inevitable Negligence will inevitably waste time, increase workload, and affect the repair time of power grid system and distribution network

Although there is an anti-islanding function inside the photovoltaic inverter, it is inevitable that the equipment will be in disrepair for a long time and the line will be aging, and some functions will lose the protection function. The unit fails to achieve the anti-islanding effect that should be expected after the mains power failure, which will directly affect the personal safety of the distribution network emergency repair personnel in the power grid system

In the photovoltaic power generation unit, photovoltaic modules and inverters, as electronic components, will generate residual current during operation, and the quality of power generation will also change slightly. When the change is large at a certain moment, it will affect the quality of the power grid

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