Elevator Energy Saving Solution
First, leading elevator energy-saving technology
Elevators are now more and more. In surveys and statistics on the electricity use of hotels and office buildings, elevator electricity consumption accounts for 17%-25% of total electricity consumption, second only to air conditioning electricity consumption, higher than lighting, Electricity consumption, such as water supply.
1.1 Development Trend
At present, elevators in foreign countries have been classified into two categories: “energy-consuming†and advanced “feedbackâ€. When customers purchase new elevators, the proportion of “return-type†elevators is increasing.
1.2 Energy Saving Effect
The energy-saving effect is related to the elevator power, the entire elevator system, and the balance system of the elevator. The following types of situations have better energy-saving effects:
The elevator with higher floors on the 1st floor has frequent braking and more energy saving.
2 The more newly installed elevators, the greater the inertia of the machine, the more energy-saving;
3 The longer the elevator is used, the greater the friction and the more energy saving;
4 The faster the elevator, the more frequent braking, the more energy saving;
5 The more frequently used elevators, the more frequent braking, the more energy saving.
1.3 safe, high quality, full intelligence
The use of advanced power electronics technology, reliable quality and safety, all intelligent operation, simple to the customer without any operation.
More perfect after-sale warranty service for customers to solve all worries. One year warranty, lifetime maintenance. II. Product Principles Overview â” Elevator Energy Saving Technology Application
With the continuous expansion of modern production scale and the continuous improvement of people’s living standards, the contradiction between the supply and demand of electrical energy has become increasingly prominent and the demand for energy-saving has been increasing. Relevant statistical data show that the electric energy consumed by the motor drag load accounts for more than 70% of the total power consumption. Therefore, the motor drive system saves energy with particularly important social and economic benefits.
There are two main types of ways that motor drive systems can save energy:
One is to improve the operating efficiency of the motor drive system, such as fan, water pump speed control is to improve the efficiency of the load operation as the goal of energy-saving measures, and then the elevator traction motor speed control to replace the asynchronous motor speed regulation is Improve the efficiency of motor operation as the goal of energy-saving measures.
The second type is to convert the mechanical energy (bit energy, kinetic energy) in the load during the exercise into energy (regeneration energy) through the energy feedback device and send it back to the AC power grid for use by other nearby electrical equipment, so that the motor drive system can be consumed in a unit of time. The power of the grid is reduced, so as to achieve the purpose of saving energy.
The following describes the second type of energy-saving principle using elevators as an example:
The frequency conversion speed-controlled elevator has the maximum mechanical function after the start-up operation reaches the maximum operating speed, and the elevator slows down until the elevator stops before reaching the target level. This process is the process in which the elevator traction machine releases the mechanical function. In addition, the elevator is still a potential energy load. In order to evenly drag the load, the load of the elevator driven by the traction machine is composed of the passenger car and the counterweight balance block, only when the car load is approximately 50% ( When one ton passenger lift passengers is about 7 people), the car and the counterweight balance block are balanced with each other; otherwise, the car and the counterweight balance block will have poor quality, so that the elevator will produce mechanical potential during operation.
Excess mechanical energy (including position energy and kinetic energy) in the elevator operation is converted into DC energy by the motor and frequency converter and stored in the capacitor in the DC circuit of the inverter. At this time, the capacitor is like a small reservoir, and the energy that is sent back to the capacitor is higher. In many cases, the higher the capacitor voltage is (like the reservoir water level is too high). If the capacitor is not discharged in time, an overvoltage fault will occur, the inverter will stop working, and the elevator will not operate normally.
At present, the vast majority of domestic frequency-conversion speed-adjusting elevators use the energy stored in the resistance-consuming capacitor to prevent the overvoltage of the capacitor, but the resistance energy consumption not only reduces the efficiency of the system, but the large amount of heat generated by the resistance also deteriorates the surrounding of the elevator control cabinet. surroundings.
The function of the energy feedback device is to effectively return the stored energy in the capacitor to the AC grid for use by other peripheral electrical devices. The power saving effect is very obvious, and the general energy saving rate can reach 21%-46%. In addition, because there is no resistance heating element, the room temperature drops, which can save the power consumption of the computer room air conditioner. In many occasions, saving air conditioning power consumption often brings greater energy-saving effect.
One of the main characteristics of the new energy feedback device compared with other energy feedback devices at home and abroad is that it has a voltage adaptive control feedback function.
The general energy feedback device decides whether to feed back electrical energy according to the size of the UPN of the DC link voltage of the inverter, and the feedback voltage adopts a fixed value of UHK. Due to the fluctuation of the grid voltage, when the value of UHK is relatively small, false feedback will be generated when the grid voltage is too high; when the value of UHK is too large, the feedback effect is significantly reduced, and the stored energy in the capacitor is consumed by the resistor in advance.
The new energy feedback device uses voltage adaptive control, that is, no matter how the grid voltage fluctuates, only when the mechanical energy of the elevator is converted into electric energy and sent into the DC loop capacitor, the new energy feedback device can timely send the energy stored in the capacitor back to the grid, effectively solving the problem. The original energy feedback defect.
In addition, the new energy feedback device has a very complete protection function and expansion function, which can be used not only for the reconstruction of existing elevators but also for the matching of new elevator control cabinets. The new elevator control cabinet is powered by a new energy feedback device, which not only can greatly save energy, but also can effectively improve the quality of the input current and achieve a higher potential compatibility standard.
The new energy feedback device is suitable for a wide range of voltage levels, such as 220VAC, 380VAC, 480VAC, and 660VAC.
First, leading elevator energy-saving technology
Elevators are now more and more. In surveys and statistics on the electricity use of hotels and office buildings, elevator electricity consumption accounts for 17%-25% of total electricity consumption, second only to air conditioning electricity consumption, higher than lighting, Electricity consumption, such as water supply.
1.1 Development Trend
At present, elevators in foreign countries have been classified into two categories: “energy-consuming†and advanced “feedbackâ€. When customers purchase new elevators, the proportion of “return-type†elevators is increasing.
1.2 Energy Saving Effect
The energy-saving effect is related to the elevator power, the entire elevator system, and the balance system of the elevator. The following types of situations have better energy-saving effects:
The elevator with higher floors on the 1st floor has frequent braking and more energy saving.
2 The more newly installed elevators, the greater the inertia of the machine, the more energy-saving;
3 The longer the elevator is used, the greater the friction and the more energy saving;
4 The faster the elevator, the more frequent braking, the more energy saving;
5 The more frequently used elevators, the more frequent braking, the more energy saving.
1.3 safe, high quality, full intelligence
The use of advanced power electronics technology, reliable quality and safety, all intelligent operation, simple to the customer without any operation.
More perfect after-sale warranty service for customers to solve all worries. One year warranty, lifetime maintenance. II. Product Principles Overview â” Elevator Energy Saving Technology Application
With the continuous expansion of modern production scale and the continuous improvement of people’s living standards, the contradiction between the supply and demand of electrical energy has become increasingly prominent and the demand for energy-saving has been increasing. Relevant statistical data show that the electric energy consumed by the motor drag load accounts for more than 70% of the total power consumption. Therefore, the motor drive system saves energy with particularly important social and economic benefits.
There are two main types of ways that motor drive systems can save energy:
One is to improve the operating efficiency of the motor drive system, such as fan, water pump speed control is to improve the efficiency of the load operation as the goal of energy-saving measures, and then the elevator traction motor speed control to replace the asynchronous motor speed regulation is Improve the efficiency of motor operation as the goal of energy-saving measures.
The second type is to convert the mechanical energy (bit energy, kinetic energy) in the load during the exercise into energy (regeneration energy) through the energy feedback device and send it back to the AC power grid for use by other nearby electrical equipment, so that the motor drive system can be consumed in a unit of time. The power of the grid is reduced, so as to achieve the purpose of saving energy.
The following describes the second type of energy-saving principle using elevators as an example:
The frequency conversion speed-controlled elevator has the maximum mechanical function after the start-up operation reaches the maximum operating speed, and the elevator slows down until the elevator stops before reaching the target level. This process is the process in which the elevator traction machine releases the mechanical function. In addition, the elevator is still a potential energy load. In order to evenly drag the load, the load of the elevator driven by the traction machine is composed of the passenger car and the counterweight balance block, only when the car load is approximately 50% ( When one ton passenger lift passengers is about 7 people), the car and the counterweight balance block are balanced with each other; otherwise, the car and the counterweight balance block will have poor quality, so that the elevator will produce mechanical potential during operation.
Excess mechanical energy (including position energy and kinetic energy) in the elevator operation is converted into DC energy by the motor and frequency converter and stored in the capacitor in the DC circuit of the inverter. At this time, the capacitor is like a small reservoir, and the energy that is sent back to the capacitor is higher. In many cases, the higher the capacitor voltage is (like the reservoir water level is too high). If the capacitor is not discharged in time, an overvoltage fault will occur, the inverter will stop working, and the elevator will not operate normally.
At present, the vast majority of domestic frequency-conversion speed-adjusting elevators use the energy stored in the resistance-consuming capacitor to prevent the overvoltage of the capacitor, but the resistance energy consumption not only reduces the efficiency of the system, but the large amount of heat generated by the resistance also deteriorates the surrounding of the elevator control cabinet. surroundings.
The function of the energy feedback device is to effectively return the stored energy in the capacitor to the AC grid for use by other peripheral electrical devices. The power saving effect is very obvious, and the general energy saving rate can reach 21%-46%. In addition, because there is no resistance heating element, the room temperature drops, which can save the power consumption of the computer room air conditioner. In many occasions, saving air conditioning power consumption often brings greater energy-saving effect.
One of the main characteristics of the new energy feedback device compared with other energy feedback devices at home and abroad is that it has a voltage adaptive control feedback function.
The general energy feedback device decides whether to feed back electrical energy according to the size of the UPN of the DC link voltage of the inverter, and the feedback voltage adopts a fixed value of UHK. Due to the fluctuation of the grid voltage, when the value of UHK is relatively small, false feedback will be generated when the grid voltage is too high; when the value of UHK is too large, the feedback effect is significantly reduced, and the stored energy in the capacitor is consumed by the resistor in advance.
The new energy feedback device uses voltage adaptive control, that is, no matter how the grid voltage fluctuates, only when the mechanical energy of the elevator is converted into electric energy and sent into the DC loop capacitor, the new energy feedback device can timely send the energy stored in the capacitor back to the grid, effectively solving the problem. The original energy feedback defect.
In addition, the new energy feedback device has a very complete protection function and expansion function, which can be used not only for the reconstruction of existing elevators but also for the matching of new elevator control cabinets. The new elevator control cabinet is powered by a new energy feedback device, which not only can greatly save energy, but also can effectively improve the quality of the input current and achieve a higher potential compatibility standard.
The new energy feedback device is suitable for a wide range of voltage levels, such as 220VAC, 380VAC, 480VAC, and 660VAC.