Different Types of Solar Inverters

Centralized inverters are generally used in large-scale photovoltaic power stations (>10kW) systems. Numerous resemblant photovoltaic strings are connected to the DC input of the same centralized inverter. Generally, three-phase IGBT power modules are used for high power. The lower power uses field effect transistors, while the DSP conversion regulator is used to ameliorate the quality of the power produced, making it veritably near to a sine surge current. Next, let's take a look at different types of solar inverters.

Here is the content list:

• Application scope classification

• Output waveform classification

• Other classification methods

Application Scope Classification

First, the ordinary solar inverter DC 12V or 24V input, AC 220V, 50Hz affair, and power from 75W to 5000W, some models have AC, DC conversion, or UPS function. Second, the inverter integrated machine or the charging integrated machine in this type of solar inverter, the stoner can use colorful forms of power to supply power to the AC cargo when there's AC power, the solar inverter uses the AC power to supply power to the cargo, or to charge the battery. When there's no AC power, use the battery to supply power to the AC cargo. It can be used in combination with colorful power sources similar to batteries, creators, solar panels, and wind turbines. 

Third, devoted solar inverter for post and telecommunications. It provides a high-quality 48V solar inverter for post and telecommunications. Its product has good quality, high trustability, modular solar inverter, and has N 1 redundancy function and can be expanded. Fourth, devoted solar inverters for aeronautics and service this type of solar inverter is 28Vdc input and can give the following AC labors 26Vac, 115Vac, 230Vac, and its affair frequency can be 50Hz, 60Hz, 400Hz, and affair power range from 30VA to 3500VA. There are also DC-DC transformers and frequency transformers for aeronautics.

Output waveform classification

Square wave solar inverter

The AC voltage waveform affair by the square surge solar inverter is a square surge. The inverter circuits used by this type of solar inverter aren't the same, but the common point is that the circuit is fairly simple and the number of power switch tubes used is small. The design power is generally between one hundred watts to kilowatts. The advantages of square-surge solar inverters are simple circuits, low prices, and accessible conservation.

Sine surge solar inverter

The AC voltage waveform affair by the sine surge solar inverter is a sine surge. The advantages of the sine surge solar inverter are that the affair waveform is good, the deformation is veritably low, the hindrance to the radio and outfit is small, and the noise is low. In addition, the protection function is complete, and the whole machine has high effectiveness.

Other classification methods

1. According to the frequency of output AC power, it can be divided into power frequency solar inverter, intermediate frequency inverter, and high-frequency solar inverter. The frequency of the power frequency solar inverter is a solar inverter of 50-60Hz; the frequency of the intermediate frequency solar inverter is generally 400Hz to ten kHz; the frequency of the high-frequency solar inverter is generally ten kHz to MHz.

2. According to the number of phases output by the solar inverter, it can be divided into single-phase solar inverter, three-phase solar inverter, and multi-phase solar inverter.

3. According to the direction of the output power of the solar inverter, it can be divided into active solar inverter and passive solar inverter. Any solar inverter that transmits the electrical energy output by the solar inverter to the industrial power grid is called an active solar inverter; any solar inverter that transmits the electrical energy output by the solar inverter to a certain electrical load is called a passive solar inverter.

4. According to the form of the solar inverter main circuit, it can be divided into a single-ended solar inverter, a push-pull solar inverter, a half-bridge solar inverter, and a full-bridge solar inverter.

5. According to the type of solar inverter main switching device, it can be divided into thyristor solar inverter, transistor solar inverter, field effect solar inverter, and insulated gate bipolar transistor (IGBT) solar inverter. It can also be classified into two categories: "half-control" solar inverter and "full-control" solar inverter. The former has no self-shut-off ability, and the components lose their control after they are turned on, so they are called "half-controlled" ordinary thyristors. The turn-on and turn-off of the transistor can be controlled by the control electrode, so it is called the "full control type". Power field effect transistors and insulated gate dual-weight transistors (IGBTs) belong to this category.

6. According to the DC power supply, it can be divided into voltage source solar inverter (VSI) and current source solar inverter (CSI). In the former, the DC voltage is nearly constant, and the output voltage is an alternating square wave; in the latter, the DC is nearly constant, and the output current is an alternating square wave.

7. According to the solar inverter control mode, it can be divided into frequency modulation (PFM) solar inverter and pulse width modulation (PWM) solar inverter.

8. According to the working mode of the solar inverter switch circuit, it can be divided into the resonant solar inverter, fixed-frequency hard-switching solar inverter, and fixed-frequency soft-switching solar inverter.

9. According to the solar inverter commutation mode, it can be divided into the ad-commutated solar inverter and self-commutated solar inverter.

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