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High performance universal frequency converter
High performance universal frequency converter
Product details
Energy saving principle of frequency converter
1. Variable frequency energy-saving:
In order to ensure the reliability of production, various production machinery are designed with a certain margin when equipped with power drives. The motor cannot operate at full load. In addition to meeting the power drive requirements, the excess torque increases the consumption of active power, resulting in energy waste. When the pressure is high, the operating speed of the motor can be reduced to save energy while maintaining constant voltage.
When the motor speed changes from N1 to N2, the variation relationship of the motor shaft power (P) is as follows:
P2/P1=(N2/N1) 3, indicating that reducing the motor speed can achieve a cubic level energy-saving effect.
2. Dynamic adjustment for energy saving:
Quickly adapt to load changes and supply maximum efficiency voltage. The frequency converter has a measurement and control output function of 5000 times per second in the software, which always maintains the high-efficiency operation of the motor output.
3. Energy saving through the V/F function of the frequency converter itself:
The V/F curve can be automatically adjusted while ensuring the output torque of the motor. Reduce the output torque of the motor, decrease the input current, and achieve energy-saving status.
4. Variable frequency with built-in soft start energy-saving:
During full voltage starting of the motor, the starting torque needs to be absorbed from the power grid
Seven times the rated current of the motor, while a large starting current wastes electricity and causes significant voltage fluctuations and damage to the power grid, increasing line and transformer losses. After adopting a frequency converter, the starting current can be reduced from 0--
The rated current of the motor reduces the impact of starting current on the power grid, saves electricity costs, and also reduces the speed impact of starting inertia on the large inertia of the equipment, extending the service life of the equipment.
5. Improve power factor and save energy:
An electric motor generates torque through electromagnetic interaction between the stator winding and rotor winding. The winding is affected by its inductive reactance. For the power grid, the impedance characteristics are inductive, and the motor absorbs a large amount of reactive power during operation, resulting in a decrease in power factor.
After adopting a variable frequency energy-saving speed controller, its performance has changed to:
After rectification and filtering, the load characteristics of AC-DC-AC have changed. The impedance characteristics of the power grid are resistive, and the power factor is high, reducing reactive power losses.
When the motor is started directly, the current is 7 times the rated current of the motor, and a large starting current wastes electricity and causes significant voltage fluctuations and damage to the power grid, increasing line loss and transformer loss,
Principle of PID Control
According to the feedback principle, in order to maintain a physical quantity unchanged or essentially unchanged, it should be compared with a constant value to form a closed-loop system. We must introduce hydraulic feedback values to compare with the given values in order to maintain a constant hydraulic pressure, thus forming a closed-loop system. But the controlled system is characterized by nonlinearity and large inertia. Nowadays, the combination of control and PID methods uses fuzzy control to accelerate response speed when pressure fluctuations are large; When the pressure range is small, PID is used to maintain static accuracy. This algorithm can be implemented through PLC and intelligent instruments, while programming the PLC to switch between the power frequency and frequency conversion of the pump. Practice has proven that using this method is feasible and cost-effective.
To maintain the pressure of the liquid supply network constant, a pressure transmitter is installed as a feedback element in the management of the pipeline system according to the feedback theorem. Due to the long and large diameter of the water supply system pipeline, the filling of the pipeline network is slow. Therefore, the system is a large lag system and it is not easy to directly use PID regulators for control. Instead, PLC is used to participate in the control to achieve the regulating effect of the control system
Control principle of wind speed controller
Using variable frequency speed regulation to achieve constant pressure liquid supply has a significant energy-saving effect compared to using regulating valves to achieve constant pressure liquid supply (which can be calculated according to specific situations). Its advantages are:
1. Starting balance, the starting current can be limited within the rated current, thus avoiding the impact on the power grid during starting;
2. Due to the decrease in the average speed of the pump, the service life of the pump and valves can be extended;
3. Can eliminate the hydraulic hammer effect during start-up and shutdown;
Generally speaking, when a frequency converter controls an electric motor, it is only necessary to match the capacity of the motor equipped with the frequency converter with the actual motor capacity. When a frequency converter controls two motors simultaneously, the capacity of the motor equipped with the frequency converter should be equal to the sum of the capacities of the two motors. But if the liquid output during peak load is much different from the full speed liquid supply of two water pumps, it is possible to consider reducing the capacity of the frequency converter appropriately, but sufficient capacity should be reserved.
1. Variable frequency energy-saving:
In order to ensure the reliability of production, various production machinery are designed with a certain margin when equipped with power drives. The motor cannot operate at full load. In addition to meeting the power drive requirements, the excess torque increases the consumption of active power, resulting in energy waste. When the pressure is high, the operating speed of the motor can be reduced to save energy while maintaining constant voltage.
When the motor speed changes from N1 to N2, the variation relationship of the motor shaft power (P) is as follows:
P2/P1=(N2/N1) 3, indicating that reducing the motor speed can achieve a cubic level energy-saving effect.
2. Dynamic adjustment for energy saving:
Quickly adapt to load changes and supply maximum efficiency voltage. The frequency converter has a measurement and control output function of 5000 times per second in the software, which always maintains the high-efficiency operation of the motor output.
3. Energy saving through the V/F function of the frequency converter itself:
The V/F curve can be automatically adjusted while ensuring the output torque of the motor. Reduce the output torque of the motor, decrease the input current, and achieve energy-saving status.
4. Variable frequency with built-in soft start energy-saving:
During full voltage starting of the motor, the starting torque needs to be absorbed from the power grid
Seven times the rated current of the motor, while a large starting current wastes electricity and causes significant voltage fluctuations and damage to the power grid, increasing line and transformer losses. After adopting a frequency converter, the starting current can be reduced from 0--
The rated current of the motor reduces the impact of starting current on the power grid, saves electricity costs, and also reduces the speed impact of starting inertia on the large inertia of the equipment, extending the service life of the equipment.
5. Improve power factor and save energy:
An electric motor generates torque through electromagnetic interaction between the stator winding and rotor winding. The winding is affected by its inductive reactance. For the power grid, the impedance characteristics are inductive, and the motor absorbs a large amount of reactive power during operation, resulting in a decrease in power factor.
After adopting a variable frequency energy-saving speed controller, its performance has changed to:
After rectification and filtering, the load characteristics of AC-DC-AC have changed. The impedance characteristics of the power grid are resistive, and the power factor is high, reducing reactive power losses.
When the motor is started directly, the current is 7 times the rated current of the motor, and a large starting current wastes electricity and causes significant voltage fluctuations and damage to the power grid, increasing line loss and transformer loss,
Principle of PID Control
According to the feedback principle, in order to maintain a physical quantity unchanged or essentially unchanged, it should be compared with a constant value to form a closed-loop system. We must introduce hydraulic feedback values to compare with the given values in order to maintain a constant hydraulic pressure, thus forming a closed-loop system. But the controlled system is characterized by nonlinearity and large inertia. Nowadays, the combination of control and PID methods uses fuzzy control to accelerate response speed when pressure fluctuations are large; When the pressure range is small, PID is used to maintain static accuracy. This algorithm can be implemented through PLC and intelligent instruments, while programming the PLC to switch between the power frequency and frequency conversion of the pump. Practice has proven that using this method is feasible and cost-effective.
To maintain the pressure of the liquid supply network constant, a pressure transmitter is installed as a feedback element in the management of the pipeline system according to the feedback theorem. Due to the long and large diameter of the water supply system pipeline, the filling of the pipeline network is slow. Therefore, the system is a large lag system and it is not easy to directly use PID regulators for control. Instead, PLC is used to participate in the control to achieve the regulating effect of the control system
Control principle of wind speed controller
Using variable frequency speed regulation to achieve constant pressure liquid supply has a significant energy-saving effect compared to using regulating valves to achieve constant pressure liquid supply (which can be calculated according to specific situations). Its advantages are:
1. Starting balance, the starting current can be limited within the rated current, thus avoiding the impact on the power grid during starting;
2. Due to the decrease in the average speed of the pump, the service life of the pump and valves can be extended;
3. Can eliminate the hydraulic hammer effect during start-up and shutdown;
Generally speaking, when a frequency converter controls an electric motor, it is only necessary to match the capacity of the motor equipped with the frequency converter with the actual motor capacity. When a frequency converter controls two motors simultaneously, the capacity of the motor equipped with the frequency converter should be equal to the sum of the capacities of the two motors. But if the liquid output during peak load is much different from the full speed liquid supply of two water pumps, it is possible to consider reducing the capacity of the frequency converter appropriately, but sufficient capacity should be reserved.
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