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The advantages of MPPT controller with more strings and fewer strings

The advantages of MPPT controller with more strings and fewer strings

(Summary description)Each MPPT circuit of the inverter operates independently and does not interfere with each other. The strings can be of different models, different quantities, or different directions and tilt angles, so the number of strings is small and the system design flexibility is greater.

The advantages of MPPT controller with more strings and fewer strings

(Summary description)Each MPPT circuit of the inverter operates independently and does not interfere with each other. The strings can be of different models, different quantities, or different directions and tilt angles, so the number of strings is small and the system design flexibility is greater.

Information

1. Each MPPT circuit of the inverter operates independently and does not interfere with each other. The strings can be of different models, different quantities, or different directions and tilt angles, so the number of strings is small and the system design flexibility is greater.

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2. Reduce DC side fuse faults: The most common fault in photovoltaic systems is DC side faults. One MPPT is configured with 1 to 2 strings. Even if a component is short-circuited, the total current will not exceed 15%, so no configuration is required. Fuse, fuse common failure modes are divided into overcurrent fuse, aging fuse, over temperature fuse. Overcurrent fuse is a protective fuse that occurs when overload, short circuit, etc. exceed the rating; aging fuse means that in the long-term work, it is the same as its own aging, the current interception capacity is reduced, and there is no overcurrent. Fusing: The current of the fuse has a great relationship with the temperature. If the fuse works at high temperature, the current interception capacity will decrease, and the possibility of faulty fuse will be relatively large.

3. Accurate fault location: The inverter independently detects the voltage and current of each input channel, can sample the current and voltage of the string in real time, and timely find problems such as line faults, component faults, and occlusion. Through the horizontal comparison of strings, comparison of meteorological conditions, comparison of historical data, etc., the detection accuracy is improved.

4. Matching power optimizer is more suitable: At present, one of the solutions to eliminate the matching effect at the component end is to use a power optimizer. The photovoltaic optimizer can convert low current into high current according to the needs of the series circuit, and finally each power optimizer The output terminals of the inverter are connected in series and connected to the inverter, and multiple strings are connected to the optimizer. According to the principle that the voltage of the parallel circuit is consistent, when a certain string is shaded by shadows and causes the power to drop, the optimizer changes the voltage, and the total voltage of this circuit will decrease, and will also affect the voltage drop of other circuits of the same MPPT, resulting in a decrease in total power.
 

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