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According to the results of two years’ investigation, it is known that the main inverter products in 2016 are overvoltage / undervoltage protection of AC output side, harmonic and waveform distortion. For two years, the overvoltage / undervoltage protection of the AC output side has become the most problematic project. Why is there always problems?

It is understood that the overvoltage / undervoltage protection AC output side, that is the solar power station supply power to the power grid through the solar inverter, when the inverter AC output terminal voltage exceeds (or below) the allowable voltage range of the power grid, the inverter will automatically disconnect the AC contactor, stop power supply, and also issued a warning signal. The function of the inverter is very obvious, that is, to ensure the safe power supply of the solar power station on the premise of guaranteeing the stability. For the power grid, a large number of access over the allowable voltage range is likely to cause damage to the stability of the grid. Because of the unstable characteristics of solar power station, the performance of inverter’s output voltage and undervoltage protection determines the grid friendliness of solar power generation, and its importance is self-evident.

The over voltage protection value of the solar panel power inverter is 195.5V-253V, and it is not a very difficult technical standard to realize. But why has it become a heavy disaster for solar inverter products for several years? This may be related to the uneven level of domestic power grid construction. For example, there are some problems in some parts of China, such as insufficient distribution transformer capacity, too large load / too small load, resulting in high voltage range of 270V and low 180V. In order to adapt to the complex conditions of these areas, some businesses may broaden the over voltage protection range of the inverter to enhance the adaptability of the inverter.

In addition, in the era of power generation, a wider range of over voltage and undervoltage protection will enable the power station to incorporate more power into the power grid, which will increase the power plant benefits. But if all solar power stations ignore the stability of the grid and frantically output the power beyond the safe range, this will inevitably damage the stability of the power grid and bring potential security risks. Once the stability of the power grid is affected by the access of solar power, the power limit will be inevitable.

To solve these problems, on the one hand, Chinese power grid construction still need to be improved, and according to the characteristics of new energy and electricity such as solar and wind power, we will improve the power grid technology, overcome the difficulties of new energy and power instability, and maximize access to new energy and electric power. On the other hand, it is necessary to improve the stable output of the solar power plant to ensure that the output voltage of the solar power is within the safe range.

REVO Series Wall Mounted Integrated Solar Hybrid Inverter With Built-in MPPT Solar Controller

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.

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The development of a new generation of information technology, such as large data, cloud computing and Internet of things, has pushed the airport to intelligent transformation and upgrading. Under the premise of ensuring information security, air traffic management, airline operation and management, airport operation management and other businesses gradually develop into “cloud data integration and innovative application”.

Power supply system from decentralization to centralization

The trouble of traditional decentralized power supply
As the core system of the infrastructure, the primary concern of the construction department of the Chongqing Jiangbei International Airport’s new terminal is the power supply system of the equipment. Once a power supply failure occurs, it will cause huge losses to the airport. The traditional power supply system uses distributed power supply, that is, one device corresponds to a small UPS. For example, the security channel, check-in, boarding, baggage and other original using decentralized 20-80kVA UPS power supply. Not only is it not convenient to disperse and maintain, but once it fails, it will be difficult for manufacturers to repair and maintain time, which will bring great trouble to airport electromechanical maintenance department. The distributed small UPS is inefficient, and most of the UPS efficiency of the present network is less than 90%, which can not meet the needs of energy saving and emission reduction at present.

Trend of centralized power supply system
The new terminal of the airport construction department, through the investigation of the existing scheme and after full discussion, decided to adopt the centralized power supply, to replace the original decentralized power supply system, the security channel, the original check-in, check-in, baggage and other scattered small capacity UPS power supply area with large capacity UPS centralized power supply. Considering the voltage loss and other problems, the power supply distance of the region can not exceed a certain range, and the UPS centralized power supply capacity is generally above 200kVA. Through the centralized power supply, the power supply efficiency of the system will be greatly improved and the index of energy saving and emission reduction can be realized. At the same time, centralized power supply also solves the problem of decentralized maintenance. The power supply is centralized, and the reliability of the system is higher. The 2N power supply system of power supply structure, redundant double bus system to improve the reliability of the power supply system, the fault of single equipment will not risk the system downtime.

MPS9335 10-1200KVA Without Switch Cabinet Modular Uninterruptible Power Supply

Application IDC（Internet Data Center）, computing center, ISP (Internet Service Provider ), Telecom , Finance.
bank and securities , Tax , hospital system , industrial automation , precision equipment, etc.

1. Superior energy saving: Efficiency > 96% at 50%-75% rated load, and > 95% at 25% rated load; Input PF > 0.99,input THDi<3%
2. Easy-to-install: Top or bottom cabling, no need of input cabling cabinet.
3. Easy-to-maintain: Full front access, UPS, failed part can be replaced shortly.
4. Easy-to-modify: The number of batter y cells can be configured flexibly, so the original batteries can be used when modifying the legacy system; moreover, the battery cell can be replaced in time when it fails without interrupting the normal operation of modular uninterruptible power supply.
5. Extra large LCD that can display 13 language (Chinese ,English ,Russian, French ,Spanish and so on).
6. Provide large LCD touch screen (optional).
7. Each modular uninterruptible power supply modules provide 4.5KW charge capacity. equivalent to 10 to 12A.
8. Advanced DSP full digital control technologies realize higher system stability, online capacity expansion and maintenance.
9. Advanced distributed active parallel technology realizes parallel operation of 4 UPS units and online capacity expansion without centralized bypass cabinet.
10. Adaptive to severe power grid environment due to extra wide input voltage and frequency ranges.
11. Intelligent batter y management maintains batter y automatically to prolong the batter y life.
12. The machine system for modular structure, consists of 1 to 10 module’s biggest single module to 30 kw.
13. Modular uninterruptible power supply power module supporting hot swappable, capacity upgrade extremely simple.
14. Super ability for overload and short circuit, ensure the system stability and safety under the limit state of system.

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There are a wide variety of MPPT solar controllers, and the selection of suitable models for solar street lamps needs to be taken into consideration in several aspects.

1.The power and voltage of a solar component.

If the solar panels below 120W/18V, 10A controller is OK, if 120V/18V~240W/18V solar panels, then use 20A street lamp controller.

2.Whether the LED light source has a built-in drive power. If the light source itself does not drive the power supply, then the constant current control unit with constant current should be selected. If the light source itself is powered by the power, then the ordinary type of solar street lamp controller should be chosen.

3.The light source with drive to see the arrangement of the lamp. If the 3 series is in parallel, the step-down constant current control unit is used, if it is more than 5 series, the lifting type constant current control unit is used.

4.According to the use of the environment. If it is outdoor, and there is no special sealing box, it is necessary to use the full waterproof IP68 grade solar energy street lamp controller. If there is a special sealing box, also can choose the plastic shell IP32 grade solar street lamp controller.

SOROTEC MPPT Solar Charge Controller 12V 24V 48V 60A 3200W

1. Intelligent maximum power point tracking technology increases efficiency 25%~30%
2. Compatible for PV systems in 12v, 24v or 48v
3. Three-stage charging optimizes battery performance
4. Maximum charging current up to 60a
5. Maximum efficiency up to 98%
6. Battery temperature sensor (BTS) automatically provides temperature compensation
7. Support wide range of lead-acid batteries including wet, AGM, and gel batteries
8. Multi-function LCD displays detailed information

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Inductors are generally composed of skeleton, winding, magnetic core, shield, package material, etc.. Skeleton generally refers to the bracket of winding coil. The enameled wire is wrapped around the skeleton, and then the core, copper core, iron core and so on are loaded into the cavity of the skeleton to increase its inductance. Winding refers to a set of coils with prescribed functions, and the windings are divided into single layer and multi layer. The core materials are silicon steel sheet, permalloy, ferrite, amorphous, metal powder core and so on. In a solar inverter, there are usually 4 kinds of inductors, including DC common mode inductance, boost inductor, filter inductor, and AC common mode inductor.

The common mode inductance mainly plays the role of EMI filter. On the one hand, it should filter the interference of external common mode electromagnetic to the inverter, on the other hand, restrain the electromagnetic interference of the inverter itself, so as to avoid the normal operation of other equipment in the power grid and the same electromagnetic environment.

The PV module is a DC source, and it does not produce electromagnetic interference. Some inverter manufacturers remove the DC EMI common mode inductance in order to reduce the cost. In fact, since the inverter switching speed is very high, will produce large common mode interference current, if there is no EMI DC common mode inductance, the interference current signal is transmitted to the DC cable and components, then the components will be like an antenna producing electromagnetic interference, impact signals of solar system surrounding.

In order to improve the power generation capacity, the string inverter is generally two stage structure, the input voltage range is wide, single-phase is 70-550V, three-phase is 200-1000V. The first is a boost, to configure the boost inductor, the second is to configure the inverter circuit, filter inductor, boost inductor and filter inductor is power inductors, from the current perspective, power inductor ripple in the whole operating period of current is relatively large and the working temperature is high, thus the DC bias characteristics of inductive power requirements high (especially at high temperature), high temperature Bs power inductors corresponding ferrite materials (saturation flux density) is very necessary; on the other hand, from the perspective of power loss, loss of inductance may account for the total loss of the solar inverter system 20~40%, is necessary to reduce the power loss of inductance.

SOROTEC REVO Series Wall Mounted Integrated Solar Hybrid Grid Tie Inverter With Built-in MPPT Solar Controller

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.

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In the increasingly fierce competition in the telecom industry nowadays, the telecom operators pay more attention to the rapid development of the business and the quality of the entire network. As the heart of the whole network, the network energy system is an important part. Operators need to have good cost performance, adapt to different situations, reliable and stable telecom power supply solution, so as to effectively solve the bottleneck of large-scale telecom construction and development, implement national energy conservation and emission reduction policies, and realize the high availability of the network. Under such circumstances, the establishment of a complete “network, energy integration” of the telecom power supply room, is the general trend.

Requirements of telecom network construction for power system
*The rapid construction, modular design;
*Stable and reliable;
*Green energy conservation, in line with the national energy saving policy;
*Coverage in all directions.

SOROTEC telecom power systems can meet the above 4 core requirements effectively. Compared with the traditional base station, the distributed base station has obvious changes in physical structure, power supply mode, engineering maintenance and protection, and the corresponding power support system should also adapt to this change.

*More power saving. The wireless side topology of the distributed base station becomes 1:N from the baseband and RF 1:1 relationship, accordingly, the power supply node is also changed from less to more, from a set of transmission base stations to multiple sets of power supply system.

*The physical structure of telecom base station has changed from traditional cabinet type equipment into modular, embedded, wall mounted and other forms, and the power supply scheme tends to be diversified.

*Centralized power supply becomes decentralized power supply. The wireless device connection changed from the plurality of antenna and antenna coupling of the BTS group into a simple transmission line and power line and antenna line, power supply scheme changed from the centralized power supply mode into the traditional distributed power supply.

*The change of engineering maintenance interface. The distributed power supply extends the power engineering maintenance interface to three segments, the BBU power supply section, the far distance power supply section between BBU and RRU, and the RRU power supply section.

*Lightning protection difficulty increases. The distributed base station has DC pull and DC RRU side power supply, which increases the pressure of DC lightning protection and remote AC lightning protection.

*Anti-theft difficulty increased. The increase of power line power supply and outdoor equipment will increase the difficulty of anti-theft.

SOROTEC HW9110E 1-10KVA High Frequency Outdoor Online Hanging UPS (outdoor ups systems,ups outdoor)

1.SOROTEC Outdoor Intelligent High Frequency Online UPS provide continuous pure sine wave AC power supply for

outside communications / network equipment.

2.Double-conversion online design, high temperature resistant, anti-cold, sealing level for IP55; With the wide range of input voltage and frequency of input window (- 45% +35% rated voltage and ± 10% rated frequency), in many remote areas of China after a severe test of the grid.

This outdoor UPS system is commonly used in the corner of the city, remote roads, mountains, bad environment, such as high temperature (+50 °C) / low temperature (-40 °C), severe dust, moisture, rain, mist erosion, very poor power quality (voltage longterm higher than 260V or less than 160V, frequency abnormal change) in the area.

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