Ac To Dc Inverter

（1） Advantages of series inverter:

1. It is not affected by the differences between modules in series and the shadow, and at the same time, it can reduce the mismatch between the best working point of PV modules and the inverter, and increase the power generation to the greatest extent;

2. The MPPT has a wide voltage range and more flexible component configuration; in rainy days and foggy areas, the power generation time is long;

3. Small volume, small floor area, no need for special machine room, flexible installation;

4. Low self power consumption and small fault impact.

（2） There are some problems in series inverter

1. The electric gap of power devices is small, which is not suitable for high altitude areas; there are many components, which are integrated together, and the stability is slightly poor;

2. Outdoor installation, wind and sun can easily lead to aging of shell and heat sink;

3. The number of inverters is large, the total failure rate will increase, and the system monitoring is difficult;

4. The design without isolation transformer has poor electrical safety and is not suitable for the negative grounding system of membrane module.

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