The Application Of WIN-VA-500T4 Inverter In The Blast Blower In The Power Plant


The Application of WIN-VA-500T4 Inverter in the blast blower in the power plant

Prolegomena:

With the world facing a growing energy crisis because of limited oil reserves and carbon emissions causing global warming, China is dedicated to optimizing its energy management. The problem of energy shortage has been badly hampering the development of the country. Thus, in such age, success of the enterprise depends on effective energy utilization and management.

Key word:

WIN-VA-500T4 inverter, blast blower, energy saving

I Introduction of Lvxiang Sugar Co., Ltd

Established in Aug. 2003, Lvxiang Sugar Co., Ltd is China’s largest sugar maker. In order to maintain self operation, the sugar maker also runs a power plant with an annual capacity of 50 million kWh. In this power plant, there is a 500KW blast blower. The current start mode of the air blower is soft start, with the starting current up to 2000A- twice as big as the rated current. The current is around 910A during normal operation. During the summer energy consumption peak, it is hard to start the inverter which accordingly increases the failure rate of the blast blower. Besides, it is not convenient and accurate to control the wind volume by the valve. Thus, in order to exert the blast blower’s maximum capacity and meet the requirements of environmental protection, Lvxiang Sugar is determined to reform its operation level. It decides to purchase a high performance vector control inverter from Shenzhen Winner S&T Co., Ltd after comparison and investigation.

II Application

Nearly 100 sets of upper 400kW high performance vector control inverters manufactured by Shenzhen Winner have been put into use in various industries, including the cement industry, the petrochemical industry, the ceramic industry, heating & ventilation, water supply, etc.

Features of WIN-VA inverter:

1. Applicable to large inertia load and potential load, with high accuracy. The WIN-VA series inverter can be better suitable to tough localities as its main circuit adopts the positive and negative bus superposition technology, as well as SCR noncontact technology.

2. Four control modes for option: V/F control, V/F control with P/G, vector control, and vector control with PG, which enable the inverter with high starting torque.

3. In the mode of open-loop, can realize rated torque output at low speed, speed control range hits 100:1

4. In the mode of closed-loop, can realize full torque output at zero speed, with speed control range up to 1000:1

5. Advanced motor parameter autotuning function

6. Built-in automatic torque compensation function realizes high starting torque.

7. Built-in slip compensation function realizes high efficiency.

8. Built-in RS-485 communication port, supporting MODBUS communication protocol.

9. Built-in PID regulator

10. Friendly user interface, large screen LCD. Can realize parameter online monitoring and online regulation, in addition to parameter copy function, making operation more convenient.

11. Torque control function enables the motor be able to run with a constant torque

12. Less pollution to the grid

Reconstruction Proposal:

On the operation desk, the user can enable RUN/STOP, and speed control functions, and monitoring is also accessible through sending the frequency and current signals back to the operation desk in the control room. Parameter settings as follows:

Environment settings:

  • A1-00:0- English - language selection
  • A1-01:4- senior setting- parameter read and written
  • A1-02:2- vector control without PG – control mode selection Application settings:
  • B1-01:1-external terminal control-frequency command selection
  • B1-02:1- external terminal control –run command selection
  • B1-03:1- coast to stop – stop mode selection
  • B3-01:1- speed search at start – speed search selection
  • C1-01:180S- acceleration time 1- acceleration time
  • C1-02:190S- deceleration time 1- deceleration time
  • C8-30:2- carrier frequency – carrier frequency selection

IV Conclusion

After reconstruction, the system can meet all the requirements of the previous soft start system. What is more important, the user can maintain the operating frequency of the inverter at 40HZ, which is enough for its normal production. The current at the input side is around 630A, representing an energy saving rate up to 32%, compared with the previous 910A. Since the installation of the inverter last Oct., it has been working smoothly. In addition, it helps the user secure a mass of maintenance and repair cost as it can effectively prolong the useful life of the blowers.