Programmable logic controller (PLC)-and-frequency-converter-based energy saving control system and method for doubly-fed motor

A technology for motor energy saving and control system, applied in motor generator control, electronic commutation motor control, control system and other directions, can solve the problems of low reliability and complex structure, and achieve high reliability, simple control structure and control advantages. energy saving effect

Inactive Publication Date: 2012-02-01
SHENYANG POLYTECHNIC UNIV
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Problems solved by technology

[0003] Purpose of the invention: The present invention provides a doubly-fed motor energy-saving control system and co...

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  • Programmable logic controller (PLC)-and-frequency-converter-based energy saving control system and method for doubly-fed motor
  • Programmable logic controller (PLC)-and-frequency-converter-based energy saving control system and method for doubly-fed motor
  • Programmable logic controller (PLC)-and-frequency-converter-based energy saving control system and method for doubly-fed motor

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specific Embodiment approach

[0034] Detailed ways: The present invention will be further described below in conjunction with the accompanying drawings:

[0035] like figure 1 As shown, the present invention provides a doubly-fed motor energy-saving control system based on a PLC and a frequency converter, the system includes a start switch, a state switch, a protection switch, a doubly-fed motor, a PLC, a frequency converter, an HMI human-machine interface, a Transformer, inverter input reactor, rotational speed detection unit and startup detection unit;

[0036] On the stator side of the doubly-fed motor, the stator is connected to the grid through a start switch and a protection device; on the rotor side of the doubly-fed motor, the rotor is input through a state switch, a protection switch, a step-down transformer, a frequency converter and a frequency converter The reactor is connected to the grid.

[0037]The state switch is composed of two AC contactors, one end of the normally open contact of t...

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Abstract

The invention provides a programmable logic controller (PLC)-and-frequency-converter-based energy saving control system for a doubly-fed motor. The system is characterized by comprising a starting switch, a state transition switch, a protection switch, the doubly-fed motor, a PLC, a frequency converter, a human-computer interface ((HMI), a stepdown transformer, a frequency converter input reactor, a rotating speed detection unit and a starting control unit. On the stator side of the doubly-fed motor, a stator is connected to a power grid by the starting switch and the protection switch. On the rotor side of the doubly-fed motor, a rotor is connected to the power grid by the state transition switch, the protection switch, the stepdown transformer, the frequency converter and the frequency converter input reactor. The system not only has a simple structure and high reliability, but also can utilize the peculiar control advantages and energy-saving characteristic of the doubly-fed motor.

Description

technical field [0001] The invention belongs to the control field of doubly-fed motors, in particular to an energy-saving control system and control method for doubly-fed motors based on PLC and frequency converters. Background technique [0002] With the development of power electronics technology, the doubly-fed speed control system composed of a converter composed of high-power semiconductor devices and a doubly-fed motor has received the attention of many people. Its main working principle is the stator and rotor three-phase The windings are respectively connected to two independent symmetrical power supplies. The power supply of the stator winding is an industrial power supply with a fixed frequency, while the power supply of the rotor winding needs to be adjusted according to the operation requirements in terms of voltage amplitude, frequency and phase. This speed regulation method has the advantages of adjustable power factor, high efficiency, and small capacity of th...

Claims

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Application Information

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IPC IPC(8): H02P1/26H02P21/14H02J3/18H02P21/00
CPCY02E40/30
Inventor 林成武卢博
Owner SHENYANG POLYTECHNIC UNIV
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