Currently, the plant’s transmission system often uses a flow control system through a Bypass valve. Although this system meets the current requirements, it wastes energy because the power consumption of the motor is only reduced by a small part. Eliminating the losses on these valves suggests a huge potential for energy savings.
The solution to the above problem is to use an inverter to replace the valves. On that basis, Creative Viet Company has come up with an automatic control solution, combined with energy saving by the automatic control system (PLC) of SIEMENS company through the MICRO – MASTER 430 inverter for pump and fan motors of the above systems.
When active, the MM430 variable frequency control is only for a main pump. If actual demand greater ability to work by it, the system will turn the pump boot for the next until you meet the requirements. The process of booting the pump for this use only a soft boot.
Calculate energy savings of variable frequency is built on the basis of over temperature sensor to determine the optimal pumps, assuring meet practical requirements of the system, ie the technology requirements how much traffic different, the frequency variable will control for the engine of the pump or fan back in the wind speed varies. This will help the capacity consumption is reduced to a significantly. Therefore, traffic has outputs in accordance with practical requirements, not just use the liberated energy admits
For loads with constant torque, the voltage-to-frequency ratio is constant. However, for pump and fan loads, the law is a quaternary function (voltage is a quaternary function of frequency). This results in a torque characteristic that is a quadratic function of speed, which is suitable for the pump load requirements since the torque itself is also a quadratic function of the voltage. The power conversion efficiency of the inverters is very high, because of the use of power semiconductor components manufactured according to modern technology.
System is used to control valves have weaknesses in that, the required 80% level of traffic, it makes up to 96% capacity of the consumption list, while the variable frequency only 52%, ie system variables frequency can save 44% power. Although the reduction of the flow, energy consumption is also reduced, but Tổn hao on equipment such as control valves are still large.
Ability to automate system through the PID integration available for the driver within closed, the communication system with automatic RS485 on the frequency variable. Process to boot the system, the mechanical details of communication will be less wear new or broken Broken, ensuring high life. Therefore, costs for maintenance, system maintenance is reduced significantly.
This solution not only works effectively in many countries in the world that currently are being applied in Vietnam very much.
The Cosphi power factor is always kept at 0.96, which makes the grid highly efficient and reduces the cost of the reactive power compensation system, ensuring a continuous control mode, which is absolutely suitable for the grid. technology requirements for air flow. All of the above benefits have resulted in significant increase in process quality and energy savings.
When the van does not use (or to the open van available maximum), of course will not damage the van, the engine nor the capacity of the larger axis of needs. Coastal frequency of the principles of frequency change (with change voltage) should always ensure that models meet men boot load exceeding even in very low speed. Also included in the electric engine does not increase, due to coordination between the voltage and frequency to keep the students from the full scope of men. Boot line of the biggest changes the transmission frequency with the ink. Therefore, do not depreciate the net when you start, ensure other applications are unaffected.
According TKNL Center Hanoi, 15/04/2009
