A tour bus project in Zhuzhou is composed of 6 carriages, and there are two 9.2kW motors at the junction of each two carriages, and the rubber wheels are separated from the independent drive rubber wheels and the monorail steel structure surface to form a marching power, and the two motors are driven by a 22kW inverter, and the power of the whole tour bus is provided by five 22kW inverters.
Performance requirements for inverters:
The inverter needs to support the PROFINET bus;
The motor has no speed sensor, and the inverter is controlled by open loop, and each inverter drags two motors;
Multiple motors can be regarded as hard connections between them, and it is necessary to ensure that the output power of the inverter is balanced, including flat, uphill, downhill and hump road conditions. In the meantime, the inverter is in the electric condition under flat ground and uphill road conditions, the inverter is in the power generation condition under downhill road conditions, and the inverter is half in the power generation condition and half is in the electric condition under the hump road condition;
Safety requirements for frequency converters:
The motor brake is controlled by the inverter, and the tour bus can not roll when starting and stopping on the ramp;
The tour bus is powered by the trolley line on the side of the track, and the long-distance power supply may lead to low power supply voltage, and the demand can run normally and stably under this condition;
Comfort requirements for frequency converters:
The motor is turning down, and the tour car is moving forward, which may be in an uphill condition or a downhill condition at this time, so the direction of motor rotation has nothing to do with the uphill or downhill condition. In this case, it is necessary to ensure the comfort of starting and stopping, that is, the uphill start does not slip, the downhill starts without impact, and the parking is stable;
According to the above skill requirements, select the special Goodrive350-19 inverter for lifting, and the inverter will complete the customer's skill requirements through the following methods;
Excellent performance
Optional PROFINET communication card, support PROFINET bus, at the same time the system standby terminal control, when the bus failure, can be seamlessly switched to terminal control, the selection of multi-speed speed for speed control, to ensure the maximum degree of reliable operation of the tour car;
The inverter adopts the unique I/F control, which is based on the current control, which can ensure that the output current is stable at the set value, so as to ensure that the low-frequency torque is satisfied. The control method is not resistant to motor parameters, and can ensure the effective drive of multiple motors.
The droop control is selected, and the appropriate droop control frequency reduction rate is set to ensure the output power balance of the inverter, and the output torque difference of the inverter measured in the field is within 2%;
Safe and secure
Goodrive350-19 is a special inverter for lifting, which has a complete brake control logic and brake opening torque detection, which can ensure that the start and shutdown do not slip;
When the voltage drop of the conductor line is too large, when the power supply voltage of the inverter is insufficient, the inverter can actively reduce the output frequency to maintain the satisfactory torque output, so as to ensure the reliability of the operation of the tour car, and the reliability is more than 30% better than in the past;
Good comfort
Unique I/F control, 160% output current below 5HZ to ensure low-frequency output; Set the opening 0.3HZ and the closing 0.2HZ to ensure that the impact of start and stop is small, and at the same time, the S acceleration and deceleration curve is selected to ensure the comfort of the start and stop instant.
Since the end of commissioning, the equipment has been verified by the reliability of the customer's long-term load operation, and the stability, comfort and reliability of the tour bus can completely meet the requirements of the customer, breaking the long-term monopoly of the imported inverter brand in this field, and winning outstanding recognition in the client, which proves that the INVT Goodrive350-19 series lifting special inverter can completely meet the requirements of the monorail overhead tour car.
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