Application of Frequency Converter in Public Electrical Equipment in Modern City
Research on technology and method of laboratory work in colleges and universities. Application of frequency converter in modern urban public electrical equipment Yang Jian (School of Electrical Engineering, Xinjiang University, Urumqi, Xinjiang, high-rise building water supply system, air conditioning system, elevator system, boiler heating system, fire protection system, etc.) In urban electrical equipment, application promotion will promote the further development of electric drive systems. As a high-tech product of modern frequency conversion technology, the frequency converter has strong functions, stable performance, high precision, fast response, convenient installation and debugging, wide application fields and energy saving. It is in the BI tube (BiPOruncT converter technology, AC motor vector transformation control technology, PWM (PulseW word control technology, developed and improved day by day. In the electric drive system, frequency conversion technology will gradually replace the DC motor speed control drive system. The frequency converter is a high-tech product integrating microcomputer, variable current and sensing technology. The control method is derived from the motor rotor formula n = (1 s) 601 / P motor speed adjustment is usually carried out by changing the motor pole pair p or changing the rotor winding resistance to change the motor slip ratio S, due to the motor pole pair The number p can only be divided into a limited number of pairs to form a regulated speed split stage. The rotor current is too large, the insulation is aging, and the life is reduced. The limitation of power frequency I in the power grid is not likely to achieve wide frequency domain motor speed regulation, and modern frequency conversion technology can achieve smooth wide-area speed regulation. The principle block diagram is as follows: the university laboratory work researches it through the three-phase bridge rectifier circuit, first turns the alternating current into direct current, and then the inverter realizes the direct current to different frequency AC conversion, and the output frequency and voltage are controlled by the control circuit. That is to say, PM technology is used to realize the frequency and voltage control of the output AC of the inverter, achieving the purpose of high performance speed regulation. The frequency converter has received attention because of its versatility and advanced performance for controlled machinery. For example: the SMGS series inverters produced by AB have more than 200 parameters, and the corresponding programs are set according to different purposes. The operator only needs to preset the program parameter setting value in combination with the actual application, and the satisfactory result can be achieved. Its function: 1 has six digital inputs, realizes various functions through external switch interface; 2 is equipped with RS-485 serial communication port and remote control interface, easy to realize remote control of motor; equipped with two adjustable plus, deceleration integral It is easy to realize soft start of motor and soft stop; 4 output frequency can be set to 0.OlHk level, which realizes stepless speed regulation which is difficult to realize by conventional method; configure P regulator. Therefore, it is possible to collect signals from the sensor and realize the speed control of the asynchronous motor through closed-loop control; 6 has two analog and three relay outputs, monitor the running state, and query the cause of the fault on the display, fully realize Asynchronous motor over-voltage, over-current, under-voltage, over-temperature, stalling and other fault alarms or tripping functions, reducing the number of failures and maintenance workload. The application of frequency conversion technology in modern urban public electrical equipment. The urban high-rise building water supply system adopts the frequency conversion speed control method, which can save the water tower and the high water tank, and only need to keep the bottom small water tank to realize the constant pressure water supply. According to the pressure sensor, the water continuous measurement and control signal is automatically transmitted to the frequency conversion device to meet the constant pressure water supply, and its sleep function also ensures automatic sleep shutdown when no water is used. Eliminates pump room noise and reduces energy consumption and mechanical wear. The measured data shows that it can save 50%. When a frequency converter has one main pump and two auxiliary pumps, when the water consumption exceeds the main pump water supply capacity, the two auxiliary pumps can be switched in time, and The function of switching the standby pump at a time has eliminated the situation that the auxiliary auxiliary pump does not need to be easily rusted for a long time. 2The air conditioning system adopts the frequency conversion speed control mode. Regardless of the system air conditioner or the window air conditioner, it can save a lot of electric energy in the case of satisfying the use function. The system air conditioner cooling tower fan is equipped with a frequency conversion speed regulating device, and the air conditioner can be based on the indoor temperature. , environmental standards such as carbon dioxide concentration. The frequency converter controls the fan speed of the air conditioner to control the air intake, which effectively reduces the heat load of the refrigerator. Compared with the general system air conditioner, the biggest advantage is that it can adjust the air intake according to the number of indoors and the temperature difference between day and night, saving energy. 3 elevator system conventional rope elevator speed control method, mainly using thyristor stator thyristor stator voltage control. This type of torque control has the drawback of operating in a low efficiency zone at low speeds. High energy consumption and low power factor. If the torque ripple generated by the motor is consistent with the natural frequency, resonance will also occur. Affect the comfort of the ride. The use of variable frequency speed control devices can greatly improve these, and the power consumption can be reduced by more than one-half. The power factor is significantly improved. If you add the integral acceleration technology, the comfort and efficiency of the ride will be greatly improved. 4 Other applications of refrigeration systems, boiler heating systems, fire protection systems, etc., with low energy consumption, low noise, high efficiency, people gradually understand the realization of the conversion of technology to productivity, the development and application of frequency conversion technology In turn, the intelligent electrical network system centrally controlled by the computer is realized to promote the development of society. Polyester Dty,Polyester Yarn Dty,Polyester Dty Yarn,Dty Polyester Yarn Ningbo Grantex Textile Co., Ltd , https://www.grantexindustries.com