Background and trends of solar inverters

Many of the advantages of the solar inverter, which is safe and reliable, no noise, no pollution, energy widely available, without geographical restrictions, no consumption of fuel, easy to maintain, can be unattended, establishment period is short, the size of random, without erecting transmission line can be easily combined with the building, and so are the advantages of conventional power generation and other power generation methods that fall. With the continuous development of the type of increase in 1000w charger inverter and control technology, the photovoltaic power generation system can be applied to all areas of the national product and related to daily life.
Inverter PV system is an important part of the nature of the power inverter output power quality photovoltaic systems. Modern inverter technology, many different types, can be categorized in different forms, there are several:
(1) according to AC inverter output frequency can be divided into frequency inverter, medium frequency and high-frequency inverter. Frequency conversion inverter makes use of frequency transformers to achieve electrical isolation between input and output. This inverter is a simple structure, reliable operation, but the inverter is bulky, heavy, noisy, efficiency needs to be improved. With the increasing performance requirements of the power supply, conventional frequency 4000w solar inverter gradually transform difficult to adapt to the lightweight, high power density, high reliability requirements. High-frequency transformation is the use of high frequency conversion technology, it has the advantage of small size, light weight, low noise, high efficiency.
(2) according to the number of phases of the inverter output can be divided into single-phase inverter, three-phase inverter and multiphase inverter.
(3) The form of the main circuit of the inverter can be divided into single-ended, push-pull, half-bridge and full-bridge and so on.
(4) by type inverter main switching devices can be divided into thyristor inverter, transistor inverter, inverter FET, IGBT inverter, and so on.
(5) by stabilizing output parameters can be divided into voltage inverter and a current source inverter.
(6) according to the control mode can be divided into transposition PWM control mode and control mode. Transposition control principle is that the two switches full bridge circuit for each leg of the complementary conduction, a phase difference between the two bridge arm switch is turned on, and by adjusting the size of the phase shift angle, to regulate the output voltage pulse width, to regulate the output voltage.

For solar inverters, the input is generally low-voltage DC output high voltage frequency AC output voltage waveform has two types: sine wave and modified sine wave. Pure sine wave power inverter corresponding thereto may be suitable for all types of load, have a good ability to adapt, due to its harmonic content is small, high power quality, so it has good market prospects.
Energy conversion technology development so far, it is no longer an optional back-up device, but the power supply system is an indispensable part. In particular, and combine photovoltaic power generation system that enables independent development of photovoltaic power supply have a broader space. In China's vast central and western areas without electricity, the population density, live in scattered, and has abundant solar energy resources, is very suitable for the development of stand-alone photovoltaic technology. Combining photovoltaic technology and power conversion technologies will be greater development, become an important way to solve the power shortage in the western region without electricity or electricity.

The various components of the solar inverter efficiency impact assessment

The use of solar PV systems more widely, not only in industry, but also began to slowly into the family. How to improve the efficiency of solar power is solar energy development has been plagued by reason. Solar cells and solar inverter itself is connected with the public grid or solar energy efficiency distribution power, solar technology is the key to success.
Solar systems, the solar cell power regulator enables work to maximum efficiency. Whether to adopt 4000w charge inverter transformer, it will directly affect the efficiency of the system. Using a transformer system efficiency will directly lead to decline 1-2%, while solar inverter DC component must be avoided, current requirements must be less than 5mA. The output filter may weaken from the output of the 4000w inverter charger stage generates a current ripple is inversely proportional to the size of the switching frequency of the filter and the costs associated with the inverter. The higher the switching frequency, the smaller the filter size, the cheaper the price. However, the higher the switching frequency, the greater the loss, the lower the efficiency, in order to take compromise, 16KHZ-20KHZ switching frequency, with low noise and high efficiency audio, meet the requirements of the solar inverter.
DC / DC converter is running at 100KHZ switching frequency states or more, the converter operating in continuous mode, which means that the boost inductor current is within the rated conditions will produce a continuous waveform. When the transistor is turned off, the diode is used as a freewheeling diode, the transistor can charge the inductor. That is, when the transistor is turned on again, the diode can automatically shut down.