Photovoltaic direct-current co-current and counter-current bidirectional protection system
A protection system and reverse current technology, applied in emergency protection circuit devices, emergency protection devices with automatic disconnection, electrical components, etc., can solve the problems that bypass diodes cannot provide reverse current, damage, protection, etc.
Inactive Publication Date: 2013-06-12
JIANGSU PHONO ELECTRIC
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Problems solved by technology
This reverse current can cause damage to other modules in the PV string
The bypass diodes installed in today's modules do not provide reverse current protection, they only reduce the effects of shadowing
Method used
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Embodiment 1
[0015] Such as figure 1 As shown, the protective circuit breakers of each group of photovoltaic modules in the photovoltaic DC forward and reverse current bidirectional protection system are connected in series in the circuit, the circuit breaker A is connected to the positive pole of the module, and the phase B is connected to the negative pole of the module to achieve multiple breaks. point protection. Each circuit breaker has a magnetic trip device and a thermal trip mechanism. When the fault in the system causes the current to increase slowly for a long time, it can reliably break the fault circuit.
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The invention relates to a photovoltaic direct-current co-current and counter-current bidirectional protection system, which is a direct-current circuit breaker specially researched and manufactured in order to meet the requirement of a photovoltaic system according to American UL489B standard as reference, wherein the American UL489B standard is stricter than standard of European Communities. The photovoltaic direct-current co-current and counter-current bidirectional protection system provided by the invention comprises a solar cell, photovoltaic modules and a photovoltaic series circuit, and is externally connected with a combiner box wire outgoing isolation electric appliance and an inverter direct-current side protection electric appliance.
Description
technical field [0001] The invention relates to a photovoltaic DC forward and reverse bidirectional protection system, which belongs to the technical field of photovoltaic power generation protection. Background technique [0002] With the development of human society, energy and environment have become urgent problems to be solved for the survival and development of human beings today. Low-carbon economy has become the general trend of global economic development. Promising new energy, with the continuous expansion of the solar photovoltaic power generation industry, the photovoltaic circuit breaker market will usher in good development opportunities. [0003] Each photovoltaic module is like a small generator, and many such small generators are connected in parallel to form a large photovoltaic power generation system. The reverse current flowing from the undamaged photovoltaic module to the damaged photovoltaic module will cause the system to overload. Reverse current c...
Claims
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Inventor 陈刚
Owner JIANGSU PHONO ELECTRIC
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