Frequency converter takes the lead in setting up the "12th Five-Year Plan" energy-saving emission reduction

Recently, the “12th Five-Year Plan” energy saving and environmental protection industry development plan that has been brewing for a long time is about to come out. According to the authoritative department, the plan will provide support for the development of the energy conservation and environmental protection industry in China in terms of policies, taxation, etc. This undoubtedly gives many support. Businesses bring a huge imagination. The frequency converter acts as a component that controls the AC motor's power transmission by changing the frequency and amplitude of the motor's operating power supply. It has a unique effect on energy conservation and is undoubtedly the first benefit under such a big premise.

In 1967, the world's first inverter was successfully developed and put into commercial operation. After more than forty years of development, the frequency conversion of AC motors has become a major means of saving energy, improving production processes, improving product quality, and improving the operating environment. Inverters are favored by users for their high efficiency, high power factor, and excellent speed regulation and braking performance. They play the following three important roles in many fields:

One is the soft start function. The hard start of the motor, the direct starting current is usually 3-5 times of its rated current, and the sudden increase of the current not only increases the difficulty of motor design and production, but also causes serious impact on the capacity of the grid system, transmission and distribution facilities, and the baffle and valve. The damage to other equipment is also great. The function of the inverter is to change the frequency and amplitude of the AC motor power supply, thereby changing the cycle of its motion magnetic field, and achieve the purpose of smooth control of the motor speed. This causes the starting current of the motor to start from zero and gradually increase. The maximum value does not exceed the rated current, which reduces the impact on the power grid and the requirements for the power supply capacity, and extends the service life of the equipment.

The second is to optimize motor operation. In systems such as wind turbines and central air-conditioning systems, traditional water supply methods are implemented using water towers, high water tanks, and pressure tanks. The water pressure at the outlet is often affected by factors such as the height of the water tank and the amount of water stored. It often changes. It is not easy to truly achieve constant pressure. In addition, the conventional speed control method for fans, pumps and other equipment is to regulate the amount of air supply and water supply by adjusting the baffle and valve opening of the entrance and exit. When the input power is too large, a large amount of energy is consumed in the closure process of the baffle and the valve, resulting in waste. It is as if people did not accurately calculate the amount of work under the premise of the bricks greatly exceeded the demand shipped to the tall buildings, resulting in waste of manpower and man-hours. Today, engineers combine inverters, PID regulators, SCMs, PLCs, etc. to form a control system that can regulate the output flow of pumps and reduce ineffective labor. As long as people set the water pressure of the pumping station mains, the set value is compared with the actual value of the feedback. After the difference is calculated and processed, the system will issue a control command to control the number of pumps and the number of operation of the pump motor to achieve the water supply manifold. Constant pressure target. Compared with regulating the water pressure of the valve, the system reduces the pipeline resistance, greatly reduces the effectiveness of the cut-off loss, and does not require frequent manual operation, reducing the labor intensity. In systems such as central air conditioners and fans, inverters also perform well. Central air-conditioning is designed according to the maximum need for cold (heat) plus 10 to 20%. It has a large power consumption and a large energy-saving potential. Using frequency converters to control the speed and energy of central air conditioning refrigerating compressors, refrigerating pumps, cooling pumps, cooling tower fans, air return devices, etc., it is possible to avoid excessive flow and excessive pressure and ensure the normal and effective operation of the system. Electricity 20% to 50%. Another example is that during the construction of the “Shanghai Yangtze River First Tunnel,” the Yangtze River Tunnel, the builders need to ensure that the tunnel is about 8.9 kilometers long and has a 13.7 meter inside diameter. To this end, this project uses a Delixi converter, which directly sets the motor speed according to the amount of air used, precisely adjusts the air volume, optimizes the use of electrical facilities, and saves energy by 20%-45%.

The third is the protection of the system. After detecting the abnormal state in the system, the inverter can automatically correct the action or block the power semiconductor device PWM control signal to stop the motor automatically, such as over-current stall prevention, over-current shutdown, semiconductor cooling fan overheating, and instantaneous power failure protection.

In summary, inverters have huge and unique advantages in the field of energy conservation and emission reduction. China's inverter network thinks that inverter companies should use the “twelfth five-year plan” to save energy and reduce emissions to better establish the concept of energy conservation. The energy-saving performance of the product is further upgraded, which is beneficial to the future development of the inverter company.