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234月 2016

The EV DC charger belongs to the power distribution network, the communication mode and distribution automation are often considered together. Communication is one of the key and difficult points in the distribution network automation, application communication of different regions and different conditions is different, specific to the EV fast charger, the modes of communication are wired and wireless:

1.Wired communication mode
Wired Ethernet (RJ45 cable, optical fiber, industrial serial bus (RS485), RS232, CAN bus).
Wired Ethernet has the main advantage of reliable data transmission, large network capacity, and the shortcomings of the wiring is complex, poor scalability, high cost of construction, poor flexibility.
Industrial serial wire (RS485, RS232 and CAN wire) has has the advantages of reliable data transmission and simple design. The disadvantage is that the network is complex, poor scalability, high construction cost and poor flexibility, low communication capacity.

2.Wireless communication mode
Wireless mode mainly uses the mobile data access service, such as GRPS, EVDO, CDMA, etc..
The mobile data service of mobile operators need to connect electric car fast charger to mobile data network, need to pay expensive monthly fee, with the EV DC fast charger quantity increasing, the costs will be bigger and bigger. At the same time, the security of data and the reliability of the network are limited by the mobile operators, which is not conducive to the safe operation of the equipmen. Mobile operators mobile access bandwidth is shared bandwidth. When the local area has a lot of equipment access and the average bandwidth of access to its reliability and each user will worsen, is not conducive to the charging pile group intensive access, large data amount of data transmission.

Integrated DC Charging Pile (EV DC fast charger,EV DC charger)

DC charging rectifier cabinet with Split DC EV Charging Piles (EV fast charger,electric car fast charger,EV quick charger,fast charging car charger)

 

084月 2016

The conversion efficiency of the solar powered inverter is the efficiency of the converse the electric power from the solar panel to the electric system. In the solar power system, the inverter play the role of converting the DC power from the solar panels into AC, and transfer power to the power grid. The higher conversion efficiency of inverter is, the more electricity to sale or use can be more.

There are two major factors of inverter efficiency: one is that, when the DC current transfer to AC sine wave, need to use power semiconductor circuit of direct current to switch (a very short period of time turn-on and cut-off), then power semiconductor may generate heat, resulting in a loss. By improving the design of the switch circuit, the loss can be reduced to the minimum. The other factor is to improve efficiency by the inverter control experience. The output current and voltage of the solar panel will change with the sunshine and temperature. The inverter can control the current and voltage to achieve the maximum power (power point). The faster to find the best power point, the higher the conversion efficiency will be.

The control characteristics of the solar energy inverter will be different because of the different manufacturer’s products, and the conversion efficiency is also different.
Though the conversion efficiency of some inverters are high at the maximum power output, while are very low at low output power conversion efficiency, some inverters can keep the average conversion efficiency from high power output to low power output. Therefore, when choose the inverter, need to consider and the matching between the output characteristics and the solar panel.

IG3115C series solar inverter 1-6KW (solar powered inverters,5000 watt pure sine wave inverter)

SSP3117C 1-5KVA High Frequency Pure Sine Wave Solar Inverter with MPPT Charge (solar energy inverter,solar energy inverters)

SSP3117C 1-5KVA High Frequency Pure Sine Wave Solar Inverter with MPPT Charge (solar energy inverter,solar energy inverters)

 

084月 2016

Solar panels inverter systems are composed of solar cell, solar inverter, storage battery and controller.

The solar cell array increases the area of receiving light, which improves the efficiency of converting solar energy into direct current. The controller is designed to extend the life of the battery and the use of the inverter. The inverter plays the role of converting the DC power to AC, and the DC can supply power to AC load through the inverter.

The solar inverter is now divided into two categories, which are independent solar inverter and grid connected solar inverter.
Through reliability, rated output capacity, inverter efficiency, starting performance, harmonic distortion and output voltage stability to evaluate a independent inverter. While the grid connected inverter is mainly used in peak shaving PV power station and rooftop solar power systems, thus requiring the sine wave output current of the grid connected inverter and grid voltage should be in the same frequency. In addition, the off-grid solar power inverter is different from the independent inverter because the grid connected inverter must have island effect protection. It will bring tremendous danger to personnel and equipment if there is no island effect protection. For example, after the power supply of power grid is off, when staff maintenance the power system, the power supply of grid connected inverter may be still on, resulting in casualties. There are two kinds of prevention measures to be taken in this kind of accident, one is the active detection, the other is the passive detection. Active detection is to judge whether the power grid is on through testing the amplitude, frequency, phase and other parameters of the power grid voltage. While the passive detection is to to judge whether the power grid is lost through the detection of feedback signal. So as to make sure that staff and equipment in a safe state.

SSP3110C High Frequency Modified Sine Wave Solar Power System (Hybrid solar inverter system,solar hybrid inverter system,solar panels inverter systems)

SSP3110C High Frequency Modified Sine Wave Solar Power System (Hybrid solar inverter system,solar hybrid inverter system,solar panels inverter systems)

SSP3110C 1000-2000VA High frequency Modified Sine Wave Off-grid Solar Power Inverter (modified sine wave inverter,off-grid solar power inverter) SSP3110C 1000-2000VA High frequency Modified Sine Wave Off-grid Solar Power Inverter (modified sine wave inverter,off-grid solar power inverter) SSP3111C

 

084月 2016

With the continuous development of various new technologies, solar powered inverter faces a variety of challenges, mainly in the grid performance, protection functions and electromagnetic compatibility, etc.. Grid connected performance is to improve the efficiency of the grid, eliminate the DC component, reduce the current harmonics and so on. Electromagnetic compatibility is to control the voltage fluctuations, reduce electromagnetic radiation, improve the degree of interference and so on. In addition, need to consider that it shold be fast and smooth in the process of switching between the solar inverter and the city power. The above aspects are the main aspects of how to evaluate the solar powered inverters, if several performance metrics of an inverter is very superior, then will create a very good operating environment to the solar power system, and will also provide indirectly income to power supply company.

IG3115C series solar inverter 1-6KW (solar powered inverters,5000 watt pure sine wave inverter)

223月 2016

The output end of the early solar energy inverter system generally installed isolation transformer, to realize voltage adjustment and electrical isolation, to ensure safe and reliable operation of the system. However, isolation transformer of large volume, high cost, high loss, affect the system efficiency. If the use of high-frequency transformer to achieve the electrical isolation of PV and grid, which can reduce the system volume, quality and cost, but will not significantly improve the efficiency of the system. Therefore, non isolated grid connected photovoltaic inverter system has become a hot research topic. It has the advantages of high efficiency, small size, light weight, low cost and so on. But the elimination of transformers build electrical connection between PV and grid, leakage current could be increased substantially, conducting radiated interference, increase the net current harmonics and loss, even to endanger the equipment and personnel. Therefore, the common mode current elimination has become an obstacle which must be overcomed for the popularization of non isolated grid connected solar inverter.

 

In view of the above problems, a new type of non isolated single phase solar inverter is studied. This topology not only solves the problem of leakage current effectively, but also has the advantages of low power consumption, high efficiency, strong stability and so on.

 

For a solar panel inverter, in order to achieve high efficiency and high stability, must meet the following requirements:

(1) In order to improve the stability of the system, the inverter must avoid the shoot-through problem;

(2) To keep the output current waveform from distortion, resulting in not the pipe is damaged, should avoid a dead time;

(3) Common mode leakage current is smaller;

(4) In the guarantee of the system security situation, try to use the good performance MOS tube to improve the efficiency of the system.

IG3115CL 1-10KW Pure Sine Wave Output Power Inverter (Solar Panel Inverters,Solar Panel Power Inverter)