Performance and characteristics of Siemens Robicon Perfect Harmony Medium-Voltage VFD

The principle of Siemens Robicon Perfect Harmony Medium-Voltage VFD is a high-high structure, direct high-voltage output, without a booster transformer, and the output is a unit series phase-shifting PWM mode. The output phase voltage of the 6KV series inverter is 13 levels, and the line voltage is 25. Level.

System integration design, including input dry-type isolation transformer, frequency converter and other components and internal wiring, users only need to connect high-voltage input, high-voltage output, low-voltage control power and control signal lines. The whole system is tested as a whole before leaving the factory.

36 rectifier input meets and surpasses the strict requirements of IEEE519～1992 and GB/T14519～93 standards for voltage distortion and current distortion, and the input harmonics are within 2%.

Reach or exceed the power factor of 0.95 within the load change of 30~ (without power factor compensation device).

The frequency converter can output sinusoidal output current and voltage waveforms without a filter. There is no special requirement for the motor, and ordinary asynchronous motors can be used without derating. With the soft start function, there is no grid voltage drop caused by the start of the motor, which can ensure the safe and long-term operation of the motor.

The output waveform of the frequency conversion device will not cause the resonance of the motor, and the torque ripple is less than 0.1%. Can avoid the phenomenon of fan surge. The inverter has a resonant point frequency skip function.

The frequency conversion device has no requirements on the length of the output cable, and the motor will not be affected by the common mode voltage and dv/dt.

The frequency converter can be used for no-load debugging without a motor, or with low-voltage power without a 6kV high voltage.

The control adopts speed sensorless vector control, and the starting torque can reach 150%.

The frequency converter has a strong adaptability to the fluctuation of the grid voltage. The frequency converter can work at full load within the range of ±10%, and the frequency converter can continue to run without tripping (reduced load operation) under the condition of a 45% voltage drop.

The efficiency of the frequency converter is 98.5%, and the efficiency of the whole set (including the transformer micro-rate is over 97%, and is basically unchanged in the whole range.

Test in any direction within 1 meter from the frequency conversion device, and the measured noise of the frequency conversion device does not exceed 75 decibels.

In the entire frequency adjustment range, the controlled motor can ensure normal operation. At the output frequency, the rated current can be continuously output. When outputting frequency, it can output rated current or rated power.

The control system adopts full digital microcomputer control with self-diagnosis function.

Motor parameters are automatically detected and control system parameters are automatically optimized.

The communication between the inverter power unit and the main control system adopts light connection, which has a high communication speed and anti-interference ability, and has good safety.

The frequency conversion device can use Chinese PCm as the interface.

The inverter has a local panel control function and a remote control function, and the two control functions have a switch or switch key. The operation panel of this cabinet should be able to carry out various control operations and parameter settings. The display panel has functions such as current, voltage, frequency, power, power factor, open, stop, fault display and fault recall.

With computer online control, monitoring, detection, diagnosis functions and corresponding software.

The control system has online detection of inverter input voltage, current, input active power, reactive power, input power factor, accumulated power consumption, output voltage, current, power, frequency, motor speed, etc.

Frequency accuracy: ± 10.5% (under all factors).

The overload capacity is 120%, lmin, which meets the load requirements of pumps and fans.

150% overload protection immediately.

Speed adjustment range: O-100% continuously adjustable.

Acceleration/deceleration time 0.1-3200 seconds (can be set according to load conditions)

Output frequency 0-120HZ (can be set according to motor conditions)

The ambient temperature is -15～+40℃, and the relative humidity is 95%.

The frequency converter has a seismic resistance of level 7, vibration 0.5G

The critical speed can be skipped (3 buttons in total, can be set arbitrarily)

User-adjustable digital meter can display speed, current, voltage, power, power consumption, etc.

Main features of Siemens Robicon Perfect Harmony Medium-Voltage VFD

Professional high-voltage frequency conversion, high-quality equipment (including dry-type internal transformer), high reliability.

Excellent performance, very few input and output harmonics (6KV inverter is 36-pulse rectifier, 13-level inverter).

High-high structure, direct output 2～14KV high voltage.

The unique fast power unit bypass technology can continue to run without tripping when the inverter fails.

To adapt to the requirements of the power grid, the power grid voltage can be reduced to 55%, and the inverter can continue to work without tripping.

The input power factor is greater than 0.95 and is almost unchanged in the entire range.

The volume (including the transformer) is small (2200KW/6KV high-voltage frequency conversion complete set is only 4877mm wide), and the cost of civil engineering aa is reduced.

The inverter efficiency (including the transformer) is high, higher than 97.0%.

The protection level is high IP31, higher than the ordinary IP20, and low requirements for the user's environment.

The environmental humidity can reach 95%.

Siemens Robicon has a service center and a spare parts center in Shanghai, responding to users 24 hours a day, and has a reputation for domestic after-sales service.

Siemens Robicon has many application cases, especially power plants, with a performance of 9500KW in the Chinese market and 60,000KW in markets outside of China.

Dual-frequency braking (patented technology) greatly improves the braking off torque of voltage source transformers.

Motor parameter automatic detection monitoring machine online monitoring function.