A tour bus project in Zhuzhou is composed of 6 carriages, each two carriages are connected with two 9.2kW motors separate from the independent drive rubber wheels and monorail steel structure surface to form a marching power, the two motors are driven by a 22kW inverter, and the power of the whole tour bus is provided by 5 22kW inverters, and the requirements for the inverter are as follows:
1. Feature Requirements
Inverter demand supports 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 considered as hard connections to ensure that the output power of the inverter is balanced, including flat, uphill, downhill and hump road conditions. Among them, 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;
2. Safety Requirements:
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 conductor line on the side of the track, and the long-distance power supply may lead to low power supply voltage, and the demand can operate normally and stably under this situation.
3. Comfort Requirements:
The motor is turning down, and the tour bus is moving forward, which may be in an uphill condition or a downhill condition, so the direction of motor rotation has nothing to do with the uphill or downhill conditions. In this case, it is necessary to ensure the comfort of starting and stopping, that is, no slipping when starting uphill, no impact when starting downhill, and stable parking;
INVT system control is completed
According to the above skill requirements, choose the special Goodrive350-19 inverter for lifting, which completes the customer's skill requirements through the following methods:
1. Excellent function:
Optional PROFINET communication card, support PROFINET bus, together with the system spare terminal control, when the bus fault, 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 bus;
The inverter uses a unique I/F control, which is based on current control, which can ensure that the output current is stable at the set value, and then ensure that there is a satisfactory low-frequency torque. 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%;
2. Safe & Reliable:
Goodrive350-19 is a special inverter for lifting, with complete brake control logic and opening torque detection, which can ensure that the car does not slip when starting and stopping;
When the voltage drop of the conductor line is too large, the inverter can automatically reduce the output frequency to maintain the satisfactory torque output, and then ensure the reliability of the tour bus operation, and the reliability is increased by more than 30% compared with the past;
3. 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 start-stop impact is small, and the S acceleration and deceleration curve are selected together to ensure the comfort of the start-stop moment;
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