UPS efficiency solar inverter

UPS efficiency solar inverter
The purpose is to provide safe isolation and power grid at night and fault isolation in the event. The second structure is non-isolated solutions. Wherein, DC voltage of AC voltage output from the boost stage directly. The third innovation topology structure of the high frequency online ups switch and the power diode, and AC to boost production section of functional integration in a special topology, although the conversion efficiency of solar panels is very low, so that the efficiency of the inverter as possible close to 100% is very important. In Germany, mounted on a south-facing roof of 3kW series module with an estimated annual generation 2550 kWh. If the inverter efficiency from 95% to 96% more than a year will be able to generate electricity 25kWh. The use of additional solar module generates this 25kWh costs associated with increased quite an inverter. Because efficiency from 95% to 96% so that the inverter will not double the cost, so the more efficient inverter investment is the inevitable choice. Emerging designs in the most cost-effective way to improve the efficiency of the inverter is a critical design criteria. As for the reliability and cost of the inverter are two other design criteria. Higher efficiency can reduce the temperature fluctuation on the duty cycle, thereby improving reliability, and therefore, these criteria are actually associated with. Use module will improve reliability.

UPS Function

UPS Function
The inverter only has straight AC conversion function, also has a maximum limit to carry forward the usefulness and functionality of the solar system maintenance function problems. Summed up the initiative to stop the operation and function of the maximum pure sine wave online ups point tracking control function, anti-alone operation function (and network systems), active voltage regulation function (and network systems), DC detection function (and network systems), the DC ground fault detection function (and network systems). Here brief introductions active operation and shutdown function and maximum power point tracking control function.
An initiative to stop the operation and function of the morning after sunrise, solar radiation intensity gradually strengthen, the output of solar cells also increased, when the tasks required to reach the inverter output power, the initiative to start the operation of the inverter. After entering operation, the inverter output will be at all times the solar cell module custody, only the output power of the solar cell module is greater than the inverter output Offline ups required for the task, the inverter will continue to operate; stop until sunset, even rainy days inverter can operate. When the output of solar modules become smaller, the inverter output is close to 0, the inverter will constitute standby mode.
2, the maximum power output of the solar tracking control function module is included with the intensity of solar radiation and the solar cell module itself temperature (chip temperature) and change. Else because the solar cell module having a voltage drop with the increase of the current characteristics, and thus be able to obtain the best task exists the maximum power point. Changes in the intensity of solar radiation is obviously the best task point is also in transition. Related to these changes, the task has been to make solar modules at maximum power point point, the system always get the maximum power output from the solar components, such restraint is the maximum power point tracking control. Most important feature of solar power inverter system that covers the use of the maximum power point tracking (MPPT) in this

 

UPS is a multi-string inverter to take the advantages of centralized inverters

UPS is a multi-string inverter to take the advantages of centralized inverters and string inverters, to avoid its shortcomings, can be applied to a few kilowatts of photovoltaic power stations. In the multi-string inverters contain different individual peak online offline upstracking and dc-to-dc converter, which through a common DC DC to AC inverter into alternating current, grid to grid. PV strings of different ratings (eg: different power ratings, each string a different number of components, the components of different manufacturers, etc.), different sizes or different techniques of PV modules, strings in different directions (eg : East, South and West), a different inclination or shading, can be attached to a common inverter, while each string are working in their respective maximum peak power on. Meanwhile, the length of the DC cable to reduce the impact of shading between the strings and the loss due to differences between the strings caused minimized.

 

UPS systems are generally used for large-scale centralized inverter

UPS systems are generally used for large-scale centralized inverter PV power plant (> 10kW), the number of parallel PV strings are connected
To the same central inverter DC input Outdoor cabinet of the general three-phase IGBT power module, use less power field effect transistor, using DSP switch controller to improve the quality of the output power, making it very close to sinusoidal current. The maximum power of the system is characterized by high and low cost. But the influence of PV string matching and partial shading, resulting in efficiency and power capacity of the entire PV system. At the same time the entire photovoltaic computer ups power supply generation system reliability by poor working conditions of a photovoltaic cell groups affected. The latest research is the use of space vector modulation control, as well as the development of new inverter topology of connections to achieve high efficiency under partial load conditions. On SolarMax (Shohreh Mike) central inverter, you can attach an interface box PV array, photovoltaic panels on each string string monitoring, such as a string which is not working properly, the system will put the information passed to the remote controller, and can be stopped by a bunch of these remote control, so as not to because of the failure of a string of PV strings and impact of the work and reduce the energy output of the entire PV system

UPS inverter power in the case of access to electricity

UPS inverter power in the case of access to electricity, and every time you open UPS, we heard the sound of the relay repetitive movements, UPS panel, low battery voltage indicator is lit and the buzzer sounding.
According to the above symptoms can be judged: the failure is caused by the battery voltage is too low, leading to an unsuccessful start caused by Home inverter ups. Remove the battery, the first for a balanced charge (charging all batteries in parallel), if we do not succeed, then only replace the batteries.
6, open the mains power supply is normal UPS, inverter operation indicator flashes, the buzzer sounds intermittently,high frequency online ups inverter can only work in the state, can not be converted to electricity working condition.
Failure Analysis: power inverter can not be converted to electricity supply, indicating that the inverter power supply fails to convert part of the electricity supply, we should focus on testing:
- Mains input fuse is damaged;
- If the mains input fuse is good, check the mains rectifier filter circuit output is normal;
- If the mains rectifier filter circuit output is normal, check the mains detection circuit is normal;
- If the mains detection circuit is normal, and then check the inverter power supply is normal to the mains power switch control output.

UPS inverter power stage one pair amplifier transistor is damaged

UPS inverter power stage one pair amplifier transistor is damaged, replace the same type of transistor after running for some time because they burn too much current, caused by excessive current reasons:
- Overcurrent failure. When the inverter output overcurrent, the overcurrent protection circuit does not work;
- Pulse Width Modulation (PWM) component failure, the two complementary output waveform asymmetry, a long lead-time, on-time and short the other, so that the work of unbalanced arms, even the arms are turned on simultaneously, resulting in two tube is damaged;
- Solar panel inverter difference between the larger tube parameters, then even if the input waveform symmetry, the output will be asymmetrical, the waveform is output transformer, causing magnetic bias, ie the flux imbalance, leading to the accumulation of down transformer saturation current surge, burn computer ups power supply tube, and a burn, the other also will burn.
4, after UPS boot, no display on the panel, UPS does not work.
Failure Analysis: From Symptom judgment, the failure in the mains input, battery and mains detection portion and the battery voltage detection circuit:
- Check the mains input fuse is burned;
- If the mains input fuse is good, check the battery insurance burned, because some UPS when the battery voltage is less than the self-test, all of the output of the UPS and the display will be closed;
- If the battery insurance intact, check the mains detection circuit is working properly, if the mains detection circuit is not working properly and the UPS does not have no electricity start function, UPS also will shut down all output and display.
- If the city detection circuit is working properly, then check the battery voltage detection circuit is normal.

 

Working UPS battery voltage is low

Working industrial ups power supply battery voltage is low, but start charging more than 10 hours of battery charge voltage is still not up.
Failure Analysis: Phenomenon judged from the battery or charging circuit failure, according to the following steps to check:
- Check the charging circuit input and output voltage is normal;
- If the charging circuit input is normal, the output is not normal, disconnect the battery
Then measured, if not normal, compared with the charging circuit fault;
- After disconnecting the battery charging circuit if the input and output are normal, then the battery is not charged due to long-term, over-discharge or other reasons, to the life of the damage.

UPS work, bypass output humane allow

UPS work, bypass output humane allow UPS to avoid the user to work in BYPASS MODE not boot, causing electricity interruption, online offline ups and equipment are abnormal shutdown. ups mains input is normal, the default output without bypass. Must be turned on, will have a normal inverter output.
Input power factor correction
UPS with input power factor correction, under full load, the input power factor can reach above 0.99, so that the user's network environment is not contaminated.
· DC start
Under mains failure mode, if necessary use the UPS to start the computer or other loading equipment, UPS can boot directly to the battery current, making UPS more convenient and reliable.
· Bypass Protection
Bypass feature allows the UPS greatly enhance emergency response capabilities, while user load equipment for the power of special requirements, such as the voltage is not too high, UPS bypass supply voltage is too high protection, allowing users to load equipment from high voltage danger.
Automatic start function
When mains abnormal, enter the battery power mode until the end, UPS will shut down when the utility power is restored to normal, the United States and Europe and easy UPS will start automatically boot, normal power supply, one by one without user boot.

UPS works in normal electricity mains via surge absorption filter circuit

UPS works in normal electricity mains via surge absorption filter circuit → AC DC converter circuit to convert alternating current circuit → → DC and AC output converter supply the load and charge the battery at the same time; once microprocessor control circuitry to detect to mains interruption immediately discharge circuit → AC → DC converter converts AC power output from the battery and supply load. If UPS microprocessor control circuit detects a fault, then high frequency online ups will jump to borrow from the relay (RELAY) bypass (BYPASS), mains power supply load, and audible warning the user.
Performance
· Sine wave output
Whether in mains mode or battery mode, can be low-distortion sine wave output power for the user to load equipment for the best power protection.
· Zero transfer time
When power cut or re-power, UPS switch between AC mode and battery mode is no conversion time, effectively ensuring the reliability of the load operation.
Input zero line of fire detection
To avoid UPS mains input zero FireWire reverse the machine with zero FireWire reverse detection.
· Bypass output humanity
To prevent users make UPS work in BYPASS MODE not boot, causing electricity interruption, UPS and equipment are abnormal shutdown. ups mains input is normal, the default output without bypass. Must be turned on, will have a normal inverter output.

UPS efficiency solar inverter

UPS efficiency solar inverter
Solar inverter efficiency refers to as the demand for renewable energy, solar inverters (photovoltaic inverters) market is growing. These inverters require extremely high efficiency and reliability. These inverters used in industrial ups power supply circuits were investigated and recommended the best choice for the switch and rectifier parts. The general structure of the photovoltaic inverter shown in Figure 1, there are three different inverter available. Sunlight on the solar modules are connected in series through, each module contains a set of solar cells in series (Solar Cell) unit. Direct current (DC) voltage generated by the solar module in order of several hundred volts, the values according to the number of lighting conditions module array, and the temperature of the battery modules may be connected in series.
The primary function of this type of inverter is the input DC voltage is converted to a stable value. This function is achieved through the boost converter and the boost switch and boost diode needs. In the first configuration, after the boost stage is an isolated full-bridge converter. The role is to provide full-bridge transformer isolation. The second full-bridge converter output is used from the first full-bridge DC converter stage DC into alternating current (AC). Its output is connected to another network before being filtered through the AC Pure sine wave ups grid additional double contact relay switch

 

UPS has the following characteristics:

UPS has the following characteristics:
(1) Due to on-line UPS, whether in the mains is normal, or power outages in the city by the machine during the inverter to the battery-powered, it loads are powered by the UPS inverter. Because of this, virtually eliminating the effect of any voltage fluctuations and interference from the mains to the load of work, truly non-intrusive regulator power to the load. This is obviously not any kind of interference AC power supply can be solved. When the voltage range of 180 ~ 250V city, its output voltage range up to 220V ± 3%, stable operating frequency range of the sine wave at 50Hz ± 1%.
(2) the waveform distortion coefficient line UPS output sine wave of the minimum, generally less than 3%.
(3) mains interruption can realize on-line three phase online ups uninterruptible power supply to the load. As long as the machine battery can provide power to the UPS inverter, whether electricity is interrupted, on-line UPS is powered by the inverter to the load. Therefore, the power supply from the mains to the mains interrupt the process, on-line UPS internal action did not produce any conversion, the conversion time is zero power to the load.
(4) On-line UPS with backup UPS, compared with excellent output voltage transient characteristics. Generally l00% or 100% load load load load shedding, its output voltage range of about 1%, the change of duration is generally from 1 to 3 cycles.
(5) On-line UPS generally used above 20kHz PWM technology, the smaller the noise, about 50dB.
(6) on-line UPS control circuit, using the input transformer, the output transformer and a photocoupler device like "ferroelectric" driving part and "weak" control line portion isolated from the electrical point of view, and thus the reliability of the circuit is greatly improved. This UPS failure rate is generally low.

UPS is in on-line UPS when power supply is normal

UPS is in on-line pure sine wave online ups when power supply is normal, the power input voltage noise filter removes all the way through the grid frequency interference in order to obtain pure AC is rectified and filtered into the rectifier and converts AC power to DC smoothing, then divided into two, all the way into the charger to charge the battery, and the other way supply inverter, and inverter turn DC into AC 220V, 50Hz supply load.
When utility power outage occurs, AC input has been cut off, the rectifier is no longer working, then the battery discharge the energy delivered to the inverter, and then by the inverter converts DC into AC for load. Therefore, the load, despite the utility has ceased to exist, but this time the load is not interrupted due to electricity outage, you can still operate normally.

UPS string inverters

UPS string inverters
String inverters are now on the international market has become the most popular inverter. String inverters are based on each PV string (1kW-5kW) through an inverter, the DC side with a maximum peak pure sine wave online ups tracking based on a modular concept, in parallel with the AC-side and network
. Many large-scale photovoltaic power plants using string inverters. The advantage is the difference between the modules without strings and impact of shading, while reducing the optimal operating point of PV modules
In the case of the inverter mismatch, thereby increasing the generation capacity. Technically these advantages not only reduces system cost, but also increase the reliability of the system. Meanwhile, in the string between the introduction - the concept of "master-slave", so in the system in a single string of energy can not work a single inverter case, several groups of PV strings together, so that one or several working to produce more Solar panel inverter. The latest concept for several inverters with each other to form a "team" instead of "master - slave" concept, making the reliability of the system one step further.

 

and the computer ups power supply factor is not only the current phase

1) and the computer ups power supply factor is not only the current phase b (fundamental) and the voltage between the relevant and related to the current pulse width, even if the current (fundamental) and the voltage phase  difference between the b = 0, i.e., the current (base when the center line coincides with the wave), and the voltage based on the calculated F (a) still is not 1, and the pulse width becomes narrower as the current increases.
2) Due to the forefront of the current pulse is relatively steep, so the harmonic frequency of the current offer relatively high and rich, space launch capability to offer relatively strong.
If the UPS input circuit is a diode rectifier or a thyristor rectifier, the power factor thereof is not caused by a phase difference, but by strong interference caused by a current pulse. These high-order harmonic currents all the way to form a series mode interference Shao fleeing through electrical equipment, another way out in the form of electromagnetic radiation, the formation of RF interference nearby devices, especially so that the radio communication can not be normal.