A serial module-level photovoltaic shutdown system

Abstract

The invention discloses a series-type module-level photovoltaic shutdown system, which comprises a plurality of photovoltaic group strings connected into an array, and a shutdown controller, a photovoltaic inverter and a power network in series in turn, wherein, an input terminal of the shutdown controller is connected with an output terminal of the photovoltaic group string array; and each photovoltaic group string comprises m photovoltaic groups and m-1 photovoltaic shutdown in series; The series photovoltaic shutdown device comprises a switch tube, a high-frequency blocking inductor, a high-frequency path capacitor, a first discharge resistor, a driving capacitor, a second discharge resistor and a diode; On state, The shutdown controller generates a high frequency oscillating current. the voltage generated by this high frequency oscillating current on the driving capacitor of the series photovoltaic shutdown is used to drive the series photovoltaic shutdown to be turned on. When theswitching transistor driving signal of the shutdown controller is canceled, the driving capacitance of the series photovoltaic shutdown is gradually released, the switching transistor is turned off,and the system enters the shutdown state.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic grid-connected / off-grid power generation, and in particular relates to a series module-level photovoltaic shutdown system. Background technique [0002] With the application of photovoltaic power generation systems more and more widely, the safety issues of photovoltaic systems are getting more and more attention. There are high DC voltages in photovoltaic systems, and there are bound to be risks of electric shock and arc ignition, especially when a fire occurs in the photovoltaic system, because the system Due to the presence of DC high voltage, firefighters were unable to rescue in time. To solve this problem, the industry has generally recognized the need for component-level shutdown. [0003] At present, the module-level shutdown function products in the industry include photovoltaic optimizers, photovoltaic monitors, smart junction boxes, etc. On the one hand, these solutions all rely o...

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Problems solved by technology

[0006] The micro-controllers of the multi-component level quick shutdown devices disclosed in the above two utility models are all controlled by the instructions transmitted by the communication unit to control the operation of the drive circuit, that is, they all rely on the communication system, and the introduction of the communication system increases the cost, and Because the communication system is susceptible to interference, the work of the multi-component quick shutdown device is unstable. In addition, the two multi-component quick shutdown devices have two input ports and two output ports, which are input and connected to the output of the junction box of the component. port, output port and then in series, the wiring installation is relatively complicated

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