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With the solar power system apply more and more widely, the grid connected inverter market has also played its role as a key component of solar energy installation. In order to realize the stable and reliable operation of the grid, the grid connected inverter market must ensure the quality of the transported power and the stability of the whole grid. To keep pace with these requirements, grid operators will publish new grid operating rules that each manufacturer must follow to oversee increasing usage. Another problem for solar inverter manufacturers is that the relevant policies and regulations of different countries are different. In most cases, different projects, even in the same place, should follow different rules and regulations.
An urgent problem for grid connected solar power inverter manufacturers is that they must comply with the technical requirements of grid connected solar devices which are different in different countries. All of these countries and regions have different requirements for inverter voltage and frequency from the grid. In addition to the necessary adjustments to different system parameters such as fault crossing, the status quo also leads to higher production costs.

Technically, so far, common inverter designs use the following parameters as standard: the temperature range is between -25 ~ 50℃; the estimated period of use will be about 20 years; conversion rate is usually over 94%; with electromagnetic compatibility; lower cost; higher reliability; all power grid faults can be carried; the power factor approaches 1 while maximum power point tracking (MPPT) can be performed simultaneously.

At present, the function of most inverters is to convert the DC voltage produced by the solar device into sinusoidal AC current waveform at the switching converter to ensure the connection and synchronization between the generator and the power grid. However, this function subsequently changed. The new standards put forward different requirements for solar panel power inverter in various degrees: the development of key characteristics such as efficiency, cost and stability; compatibility with SiC, Gan and other new materials; integration with micro inverter and other innovative technologies; effective maximum power point tracking control function; and follow various new specifications, such as “anti island effect” testing.

In terms of requirements for new materials such as silicon based MOSFET, SiC technology has undergone significant changes in the field of carbide, making the production capacity of MOSFET far beyond the IGBT, especially in high pressure and high temperature conditions. This provides a feasible way to improve the efficiency of solar powered inverter.

SSP3118C4 2KVA ~ 5KVA Solar Inverter Wall Mounted Integrated

1.Pure sine wave inverter
2.Cold start function
3.Auto restart while AC is recovering
4.Overload and short circuit protection
5.Optional remote panel available
6.Selectable charging current based on applications
7.Configurable AC/Solar input priority via LCD setting
8.Compatible to mains voltage or generator power
9.Smart battery charger design for optimized battery performance
10.Parallel operation with up to 6 units only available for 4KVA/5KVA
11.Selectable input voltage range for home appliances and personal computers

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With the increasingly energy problem, the state has given high degree of affirmation to the photovoltaic industry, and encouraged various localities to actively build solar power generation projects through policy subsidies. Solar grid connected power generation system is the mainstream power supply system, which is suitable for industrial, commercial, agricultural and other
fields.

In March 17th, according to the Energy Bureau, electricity consumption in the whole society increased by 17.2% year on year, with a marked increase in heavy industry in February. Electricity consumption has risen dramatically. In order to do a better job of energy saving and consumption reduction, some provinces and cities have adopted the policy of limiting electricity for high energy consuming enterprises. After installing the grid connected power generation system, the electricity shortage will be effectively alleviated.

Distributed grid connected solar power system, because of the advantages of small investment, fast construction, small area, policy support, is the mainstream of grid connected solar power generation in developed countries, but is still not popular in China, so as the solar power plants with high yield, low cost, sustainable and scarce of the four major advantages, will have a brilliant future.

Advantages

1.Reduce circuit loss
Solar hybrid inverter system is on the user side, generating power supply to the local load, can effectively reduce the dependence on the grid power supply, and reduce circuit losses.

2.Effective use of space
Make full use of the surface of the building, solar cells can be used as building materials, effectively reducing the floor area of solar power station.

3.Off grid operation
With the smart grid and Microgrid effective interface, flexible operation, under appropriate conditions can operate independently off the grid.

SPS3115C Series Outdoor Solar Power system

■Pure sine wave inverter
■Built-in MPPT solar charge controller
■Could be built-in battery
■Protection degree:IP55
■Configurable input voltage range for home appliances computers via LCD setting and personal
■Configurable AC/Solar Charger priority via LCD setting
■Compatible to mains voltage or generator power
■Auto restart while AC is recovering
■Overload/Over temperature/short circuit protection
■Configurable battery charging current based on applications via LCD setting

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The city power is normal, people can surf the Internet, but UPS always jump to the battery power supply mode. And in this mode there is always a beep. We immediately organized the staff to check the circuit and analyze the cause of the failure. Finally it linked to the vertical air-conditioning room, every time start the air conditioning for a while, it automatically converted into battery powered. Obviously this is due to the impact of high power air conditioning to the city power output. But they are separated in two power supply, from the switchboard of different distribution room, how will interfere with each other?

With this question, the electrician followed the wire to open the ceiling, floor, junction boxes, etc.. in order to figure out that if there is a place where the circuit is falsely connected, and finally found that the zero line and the ground wire are connected together. So fuzzy interference can have an impact on the high frequency online UPS, it really is a precision device.

We decided to separate the ground wire of the air condition. After separating the zero line and the ground wire, and then start the air conditioning, found the UPS never jump again. So why this problem did not appear before? We believe that is the weather is too hot, air conditioning full load operation, which increased power consumption.

The quality of power supply is very important to the stability and security of the enterprise network. However, there are many properties of network power security, such as high performance, scalability, reliability, functionality, accuracy and availability, etc.. In order to make the enterprise network power supply can continue to run steadily, in addition to the usual use of norms, the periodic use of a variety of testing tools for the implementation of maintenance testing of the network environment is necessary. The entire room power supply safety system, need technical personnel to maintain seriously, and to do a good job of routine investigation, timely detect the problems, analysis of the impact caused by unplanned downtime.

SOROTEC HP9116CR High Frequency Online UPS 1 – 10KVA

1.Large blue LCD display interface，user-friendly. Pure high frequency online UPS 10kva，with voltage adjustment circuit,provide reliable power protection in the bad operation environment.
2.Comprehensive electric isolate and bypass protection.
3.Input power factor correction, reduce the harm of harmonic to the power grid,convenient to match small generators.
4.Automatic alarm, self test function.
5.Wide input voltage range.
6.Input neutral and live wire detect and data protect function.
7.When main power failure, the UPS going to DC start,Convenient and reliable; when main power recover,UPS restart automatically.
8.N+X Parallel Redundancy and Capacity expansion for 6K-10K.

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In the modular UPS system, when a power module of the system fails, the failure module need to exit the system timely, in order to reduce the influence of the fault module on the modular UPS system, so as to ensure the stability of output voltage.

SOROTEC in the development process of modular UPS solutions, carried out a variety of single fault test, in order to ensure the UPS power module in a single fault, to ensure the stable operation of modular UPS system. The single fault of inverter IGBT is a big challenge to the stability of UPS system.

The operating state of the modular UPS system with only 1 power module in the inverter IGBT short circuit

When only one power module is inserted into the modular UPS cabinet, as the power module of IGBT inverter is short circuited, the output voltage and current are decreased, the power module to determine inverter fault, intermittent switch to bypass power supply, the output go stably. The output interrupt time in this process is less than 20ms.

The operating state of the modular UPS system with 2 power modules in the inverter IGBT short circuit

When 2 power modules is inserted into the modular UPS cabinet, as the short circuit of one of the IGBT inverter power modules occurs, the other power module output current into the fault power module, and its current power module output energy is limited, can not fuse the output of the fault module. Until the fault module detects the inverter fault and exit the system, the system has a certain risk of intermittent cut bypass power supply, the output interrupt time in this process is less than 20ms.

SOROTEC MPS9335C 10-300KVA Modular UPS with IGBT short circuit detection

Model: 10-1200KVA
Nominal voltage: 380/400/415VAC
Output power factor: 1

MPS9335C series Modular type UPS is modular online UPS for sensitive equipments. The single cabinet power rating covers from 10KVA to 300KVA which delivers the best of combination of reliability, hot-swappable and flexibility. With the latest IGBT three-level technology and DPS control, MPS9335C achieves a high input power factor, low THDi Modular design with N+X redundancy and online hot swapping, easy to expand the capacity Full DSP control of high stability, reliability and safety Integrated IGBT module with improved performance and reduced size.

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1.Based power supply

Also known as a first power supply. The based power supply of telecom station is divided into AC based power supply and DC based power supply.

AC based power supply
The low voltage AC power supply provided by the power supply unit, the standby oil generator set (including mobile power station), the telecom inverter (or UPS) is referred to as the AC power supply of the telecom station. Low voltage AC based power supply rated voltage of 220V or 380V (three-phase five wire), rated frequency of 50Hz. Telecom equipment directly by AC based power supply, input voltage range for the rated voltage of +5% ~ -10%. Telecom equipment by AC based rectifier power supply, input AC voltage range for the rated voltage of +10% ~ -15%. In the process of power supply, if the voltage range of the voltage of the grid or generator sets is beyond the allowable range of the telecom equipment or the rectifier equipment, should adopt AC voltage regulator, to ensure that the input AC voltage to meet the requirements. The frequency range of the low voltage AC power supply shall be within the rated voltage of ±5% or less, and the sine distortion rate of the voltage waveform shall not be greater than 5%.

DC based power supply
Power supply DC voltage for all kinds of telecom equipment, telecom solar inverter and DC converter, called DC based power supply. The rated DC voltage power supply of telecom station is -48v. The battery of DC power supply usually consists of 24 lead-acid batteries, battery voltage will change in -51.6 ~ -55V when charging. In the discharge process, battery voltage will be lower than the rated voltage of the battery which is -48V, considering the voltage drop of the DC feeder between the battery room and the telecom room, the DC input voltage of telecom room of each frame allows changes in the range of -40 ~ -57V.

2.Rack power supply

Rack power also known as the second power supply. Due to a variety of special integrated circuits in a large number of telecom equipment applications, need to use 3.3V, 5V, 12V and other low-voltage power supply. In order to reduce first power requirement and save cost and reduce the maintenance workload, at present all kinds of telecom equipment is installed in the DC converter, the -48V DC voltage conversion needed for the work of 3.3V, 5V, 12V. In order to improve the reliability of power supply, several DC converters are used in parallel. In addition, a number of telecom devices are also equipped with a ringing power supply to convert the -48V voltage into the AC voltage required for ringing.

SOROTEC SHW48200 48VDC Telecom Station Solar Hybrid System

Key Features:
■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.
■Protection degree:IP55
■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.

Application

Power plant or substation power for controlling, protection and automatic device, emergency lighting, communications, steam turbine DC oil pump and so on independent DC systems. It can provide reliable power supply in the case of a power failure completely in plant or substation. The traditional DC systems connect battery pack and run with float charging mode. The new DC system run with silicon controlled rectifying power supply for battery.

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