Elevator energy saving solution

First, the leading elevator energy saving technology

Now more and more in the elevator, hotel, office buildings and other electric power survey, lift the total electricity consumption of more than 17%-25%, the elevator guide after air conditioning load, lighting, water supply and other than electricity.

1.1 development trends

At present, the elevator has been divided into "energy consumption" and advanced "feedback type" two, customers in the new purchase of the elevator, the choice of "feedback type" elevator more and more proportion.

1.2 energy saving effect

Energy saving effect is related to the elevator power, elevator system, elevator balance system and so on, the following categories of energy saving effect is better:

The higher the floor of the elevator, frequent braking, energy saving more;

The more the use of the new installation of the elevator, mechanical inertia, energy saving more;

The longer the use of the elevator, the greater the friction, the more energy saving;

Lift, the faster the braking energy saving more frequently;

By the use of the elevator, more frequently, more frequent braking, energy saving.

1.3 security, high quality, full intelligence

The use of advanced power electronics technology, reliable quality and safety, the whole intelligent operation, simple to do without the customer to do any operation.

More perfect after-sales warranty service for customers to solve all worries. One year warranty, life-long maintenance.

Two, product overview, principle and application of energy saving technology for elevator

With the continuous expansion of the scale of modern production and continuous improvement of people's living standards, the contradiction between power supply and demand has become increasingly prominent. Relevant statistics show that the motor drive load consumption of electricity accounted for more than 70% of the total electricity consumption. Therefore, the motor drive system to save energy has a particularly important social significance and economic benefits.

There are two main ways to save electric energy by electric motor drive system:

One is to enhance the efficiency of motor drive system, wind machine, pump speed control is to improve the energy saving measures of load operating efficiency as the goal, as the elevator traction machine by inverter instead of asynchronous motor speed regulator is to improve the motor efficiency as the goal of energy saving measures.

The two category is the moving load on the mechanical energy (potential energy and kinetic energy) through energy feedback converter into electricity (renewable electricity) and back to the AC grid, and other nearby electrical equipment use, the motor drive system power consumption can be decreased in unit time, so as to achieve the purpose of saving energy.

Below to lift the elevator as an example to introduce the second types of energy saving principle:

The elevator adopts frequency conversion start with mechanical function maximum running to reach the highest speed, lift to reach the target layer before gradually slowed until the elevator stops moving, this process is a process of mechanical function release of elevator traction machine. In addition, the elevator is a potential energy, in order to drag the uniform load, the load from the elevator traction machine drives is composed of passenger car and counterweight balance block, only when the car load of about 50% (1 ton passenger elevator passengers of about 7 people), car and counterweight balance block to balance each other, otherwise, the car and the counterweight balance block will have poor quality, who can make the elevator running machine.

Can the excess mechanical elevator operation (including potential energy, kinetic energy) through the motor and inverter to convert DC electrical energy stored in the capacitor converter in DC circuit, the capacitor is a small reservoir, back to the capacitor power increasing, capacitor voltage is higher (like the reservoir water level high) if not, the timely release of capacitor stored energy, will produce the frequency converter overvoltage fault, stop working, the elevator can not run normally.

At present, the vast majority of VVVF elevator adopts resistance capacitance method consumes electric energy stored in the capacitor to prevent overvoltage, but resistance energy not only reduces the efficiency of the system, a lot of heat resistance produced by the deterioration of the environment surrounding the elevator control cabinet.

The function of the energy feedback device is to be able to effectively store the electric energy back to the AC power network for the use of other power equipment, electricity saving effect is very obvious, the general power saving rate of up to 21%-46%. In addition, due to the non resistance heating element, room temperature drop, can save room air conditioning power consumption, in many occasions, save the air conditioning power consumption often brings greater power saving effect.

One of the most important features of the new energy feedback device compared with the other energy feedback devices at home and abroad is that it has the function of adaptive voltage control and feedback.

General energy feedback device is based on the inverter DC circuit voltage UPN the size of the power to determine whether the feedback, the feedback voltage using a fixed value of UHK. Because of the grid voltage fluctuation, the UHK value is in the high voltage hour will produce error feedback; UHK value is too large, will contribute to the effect of decreased (capacitor energy storage resistance consumption in advance).