1.The filtering accuracy is high, and the filtering rate of harmonic current can reach over 97%.
2.Wide range of filtering, frequency of filtering: 2-50 harmonics and interharmonics.
3.Fast response to load fluctuation with response time of 1us.
4.Dynamic injection current to suppress harmonics and compensate power factor.
5.No resonance with the system.
6.Extensible capacity with multiple combinations.
7.Suppressing system overvoltage and improving system voltage stability.
8.Damping power oscillation in power system.
9.It can restrain voltage flicker, compensate three-phase unbalance and improve power factor.
10.The system has strong self-protection and stability.
To optimize the efficiency and reliability of solar power generation system, a relatively new method is to use micro-inverters connected to each solar cell module. Each solar cell is equipped with a single micro-inverter, which enables the system to adapt to changing loads and weather conditions, thus providing the best conversion efficiency for a single solar cell and the whole system.
The concept of micro-inverters has a long history, but it did not attract people’s attention at first. In recent years, with the development of solar power technology and technological progress, micro-inverters are very attractive.
The photovoltaic power generation system with micro-inverters can simplify wiring, which means lower installation costs, higher efficiency of the solar power generation system, and shorten the time required to recover the initial investment.
Many chinese manufacturers of solar on grid inverters are mainly engaged in the development of high-power centralized on grid inverters. With the increasing popularity of domestic and foreign micro-inverters market, many manufacturers have begun to develop micro-inverters. The differences between micro-inverters and traditional inverters are as follows.
1.Inverter has low input voltage and high output voltage. The output voltage range of a single solar cell module is generally 20 to 50 V, while the peak voltage of the grid is about 311 V (220 VAC) or 156 V (110 VAC). Therefore, the output peak voltage of the micro-inverters is much higher than the input voltage, which requires the micro-inverters to adopt the inverters topology with step-up and step-down conversion function. The centralized inverters are generally buck converters, which usually adopt bridge topology. The peak voltage of the output AC side of the inverters is lower than that of the input DC side.
2.The power is small. The power of a single solar cell module is generally between 100W and 300W. The micro-inverters are directly matched with a single solar cell module, and the power level is between 100W and 300W. The traditional centralized inverters generate high enough power through series and parallel combination of several solar cell modules, and their power level is generally over 1 kW.
1.Touch screen display.
2.Output power factor PF=1.0
3.On grid with energy storage.
4.Energy generated record, load record, history information and fault record.
5.Language and time setting.
6.Structure with dust filter.
7.AC charging and AC output time setting.
8.Charging voltage and charging current timing.
9.External wi-fi device optional.
10.Parallel operation with up to only available for.
11.Smart battery charger design.
Physical environment is usually neglected when UPS is selected by industrial enterprises. Due to the influence of production and manufacturing site factors, there are many problems in industrial application environment, such as high temperature, humidity, large amount of dust and serious air pollution. In special industrial occasions, the air in the environment may also contain corrosive gases, or the body inclines in the case of vibration, which may easily lead to short-circuit of UPS internal components and power supply failure. Therefore, UPS need to have a strong environmental adaptability, to respond to the test of harsh environment with comprehensive performance.
From the point of view of electrical environment, the precise production equipment of the production line always has very stringent requirements for power supply. Power grid pollution in industrial application site is very serious, and it often faces special power supply and special industry standards. As the core of industrial power supply system, industrial UPS should be able to provide high-quality power to the load under any load and power supply conditions, eliminate the impact of instantaneous interruption of power grid and various radio disturbances on industrial equipment system, effectively prevent the harm of overvoltage of power grid to the load, and ensure the reliable operation of key industrial processes and control.
Load characteristics are an important factor affecting the selection of industrial grade UPS. In industrial automation production, due to the variety of types of electrical equipment, large differences, and complex load characteristics, the total load is often inductive, and the current fluctuation is relatively large, which will have a greater impact on the power supply. Therefore, the steady-state current and transient peak current and duration of the load are an important consideration when selecting an UPS for inductive or hybrid loads that exceed the UPS output power factor range. Due to improper consideration of the UPS power, the customer’s funds are wasted, and if the selected industrial UPS power supply is too small it will have an impact on reliable load protection. These are the ones we should avoid when choosing.
■Adopt full digital control technology.
■Intelligent detection and monitoring function.
■Digital control and static switch zero switching.
■Input/output full isolation
■DC UPS isolated with utility power completely.
■Cubicle design with power standard.
■Multifunctional protection for overvoltage,low voltage,
■Overcurrent, short circuit and so on.
■Large-screen LCD monitor Chinese and English operation interface.
■Ultralong 256 event records, user-friendly analysis and management to the situation of power supply.
■Static bypass has a strong anti-overload capacity.
1.Based on the rated current of the final electric load (motor), it is better that the rated current of the harmonic filter is more than 1.1 times of that of the load current.
2.Look at the rated working current and actual working current of the load, and do not exceed the rated working current of the harmonic filter.
3.Look at the load rate. If the load rate is too low, it will affect the effect of harmonic filter. Please check load rate data when selecting the type.
4.Check the rated working voltage and power frequency of the load equipment to see if it meets the power requirements of the harmonic filter.
5.Attention should be paid to the installation environment of harmonic filters, which meets the requirements of the environment for the use of harmonic filters.
6.It is better to provide the power factor of the load so that suitable capacitors can be installed to achieve the best power factor.
We know that the input voltage range of 12V power supply server motherboard is usually 5% positive and negative difference. If we adopt the structure of 12V bus + 12V battery BBU, it is difficult to achieve this voltage allowable range. Especially at high currents that may be as high as 23,000 amperes, the voltage drop at impedance of 1 milliohm is as high as 2 or 3 volts, and the voltage drop of copper exhaust is much higher than the voltage range of 5% or about 0.6 V. If the voltage drop is controlled by current sharing among multiple power outlets and buses, in addition to the cost and space mentioned above, additional DC/DC voltage stabilization circuit is needed to ensure the voltage reduction caused by BBU discharge. The total cost of this DC/DC voltage regulator circuit will be very high, which will also lead to the overall uneconomical system. In 48V bus structure, the main board usually has a wide range of input voltage of 36V-58V, bus voltage drop is no longer a problem, and battery BBU can be directly connected to 48V bus, without DC/DC voltage regulator circuit, so it is very easy to adopt 48V bus structure voltage allowable range.
■Adopt advanced MCU microprocessor control technology.
■Advanced MPPT Technology,High converting efficiency higher than 97% for minimizing energy loss.
■Reversed current protection at night, over voltage and reverse polarity protection.
■Capable of selecting different charging mode for various types of batteries.
■Industy-leading power density compact size and high reliability;
■Doorframe designed with waterproof structure, posted on the seal and equipped with waterproof lock on the door double insulation design;
■Cabine adopt quality galvanized sheet or aluminum coated steel sheet as material, surface coating anti-UV power;
■Suitable for outdoor installation.