Photovoltaic inverters can be divided into macro: 1. Ordinary inverter 2. Inverter / control integrated machine 3. Post and telecommunications special inverter PV inverter can be divided into:
1. Ordinary inverter
2. Inverter / control integrated machine
3. Special inverter for post and telecommunications
4. Aerospace and military special inverters
1. According to the frequency of the inverter output AC power:
(1) Power frequency inverter
Industrial frequency inverter with inverter frequency of 50~60Hz
(2) Intermediate frequency inverter
The frequency of the IF inverter is generally 400Hz to a dozen k
Hz
(3) High frequency inverter
The frequency of the high frequency inverter is generally ten kHz to MHz.
• According to the number of phases output by the inverter, it can be divided into:
(1) Single-phase inverter
(2) Three-phase inverter
(3) Multiphase inverter
• According to the direction of the inverter output power can be divided into:
(1) Active inverter
(2) Passive inverter
• According to the form of the main circuit of the inverter, it can be divided into:
(1) Single-ended inverter
(2) Push-pull inverter
(3) Half-bridge inverter
(4) Full-bridge inverter
• According to the type of inverter main switch device, it can be divided into:
(1) Thyristor inverter
(2) Transistor inverter
(3) Field effect inverter
(4) Insulated gate bipolar transistor (IGBT) inverter
• According to the DC power supply, it can be divided into:
(1) Voltage source inverter (VSI)
(2) Current source inverter (CSI)
• According to the inverter control method, it can be divided into:
(1) Frequency modulation (PFM) inverter
(2) Pulse width (PWM) inverter
• According to the working mode of the inverter switch circuit, it can be divided into:
(1) Resonant inverter
(2) Fixed frequency hard switching inverter
(3) Fixed frequency soft switching inverter
l According to the waveform of the inverter output voltage or current, it can be divided into:
(1) Square wave inverter
The voltage waveform of the square wave inverter output is square wave. The inverter circuits used in this type of inverter are not identical, but the common feature is that the circuit is relatively simple and the number of power switches used is small. The design power is typically between one hundred watts and one kilowatt.
The advantages of the square wave inverter are: simple circuit, convenient maintenance and low price.
The disadvantage is that the square wave voltage contains a large number of higher harmonics, which will cause additional losses in the load consumers with core inductors or transformers, and interfere with the radio and some communication equipment. In addition, this type of inverter has the disadvantages that the voltage regulation range is not wide enough, the protection function is not perfect, and the noise is relatively large.
(2) Step wave inverter
The voltage waveform of the output of such an inverter is a staircase wave. There are also many different lines for the inverter to achieve step wave output. The number of steps in the output waveform varies greatly.
The advantage of the step wave inverter is that the output waveform is significantly improved compared with the square wave, and the high harmonic content is reduced. When the step reaches more than 17, the output waveform can realize the quasi-sinusoidal wave.
The whole machine is very efficient when there is no transformer output.
The disadvantage is that there are many power switches used in the staircase wave superposition circuit, and some of the circuit forms also require multiple sets of DC power input. This brings trouble to the grouping of the solar cell array and the balanced charging of the wiring and the battery. In addition, the step wave voltage still has some high frequency interference on the radio and some communication equipment.
(3) Sine wave inverter
The voltage waveform of the sine wave inverter output is sine wave sine wave inverter has the advantages of good output waveform, low distortion, low interference to radio and communication equipment, and low noise. In addition, the protection function is complete and the whole machine is efficient.
The disadvantage is that the line is relatively complicated, requires high maintenance technology and is expensive.
According to the isolation mode, the PV inverter can be divided into:
(1) Independent photovoltaic system inverter
Independent inverters include village power supply systems in remote areas, solar household power systems, communication signal power supplies, cathodic protection, solar street lights and other independent power generation systems with batteries.
(2) Grid-connected photovoltaic system inverter
• Grid-connected power generation systems are photovoltaic power generation systems that are connected to the grid and deliver electricity to the grid. The solar radiation energy received by the photovoltaic module is converted into high-voltage direct current after high-frequency direct current conversion, and is converted to a grid output after being converted by the photovoltaic inverter.
Shenzhen Guruwatt - home PV inverter D brand, company website:
Http://news.chinawj.com.cn
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