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Current source converter based doubly-fed motor variable frequency speed control system

A doubly-fed motor, variable frequency speed regulation technology, applied in motor generator control, electronic commutation motor control, control system, etc., can solve the problem of difficult to achieve parallel connection of multiple converters, voltage ride through and fault protection, topology structure limitation , the increase in layout costs, etc., to achieve the effect of excellent dynamic performance and excellent steady-state performance

Pending Publication Date: 2019-01-01
CHINA POWER ENG CONSULTING GRP CORP EAST CHINA ELECTRIC POWER DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, current source conversion is rarely used on doubly-fed motors (asynchronous motors)
The converters commonly used in double-fed motor frequency conversion speed regulation systems on the market are mostly thyristor converters or voltage source PWM converters. Among them, the thyristor converters have large harmonics, slow response, and need to be connected in parallel when working. Power compensators lead to disadvantages such as increased layout costs, and are gradually eliminated by the market
The voltage source PWM converter has become the mainstream of the market. However, due to the limitations of the topology of the voltage source converter, for example, it is not easy to realize the parallel connection of multiple converters, voltage ride-through and fault protection, etc.

Method used

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  • Current source converter based doubly-fed motor variable frequency speed control system
  • Current source converter based doubly-fed motor variable frequency speed control system
  • Current source converter based doubly-fed motor variable frequency speed control system

Examples

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Embodiment 1

[0045] All documents mentioned in this application are incorporated by reference in this application as if each individual document were individually indicated to be incorporated by reference. In addition, it should be understood that after reading the above teaching content of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0046] The invention provides a double-fed motor frequency conversion and speed regulation system based on a current source converter. figure 1 is a schematic diagram of the topological structure of the doubly-fed motor frequency conversion speed regulation system 100 based on the current source converter in one embodiment of the present invention.

[0047] Such as figure 1 As shown, the system includes a three-phase AC power supply 1, a doubly-fed motor 2 and a mechanical lo...

Embodiment 2

[0087] Double-fed motor frequency conversion speed regulation system based on current source converter 200

[0088] figure 2 It is the topology structure of the doubly-fed wind power generation system 200 based on the current source converter in an embodiment of the present invention. This topology structure includes a transformer (connected to a three-phase AC power supply 1), a doubly-fed motor and a wind turbine connected to the shaft of the doubly-fed motor; it also includes: a machine-side converter 4, a grid-side converter 5, a machine-side filter 6, grid side filter 7 and DC inductor 8;

[0089] The machine-side converter 4 includes multiple sets of switches connected in parallel, each set of switches includes two series-connected reverse resistance type IGBTs 9 and has a collector and an emitter, and the collector of each set of switches constituting the machine-side collector of the machine-side converter, and the emitters of each group of switches constitute the m...

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Abstract

The invention discloses a current source converter based doubly-fed motor variable frequency speed control system. The system has high steady state performance, and has faster dynamic response when the rotating speed or torque of a doubly-fed motor changes. The system includes a three-phase alternating-current power supply, the doubly-fed motor and a mechanical load connected to the rotating shaftof the doubly-fed motor; and the system is characterized in that the system also includes a motor side converter, a grid-side converter, a motor side filter, a grid-side filter and a direct current inductor. the motor side filter is connected between the control winding of the doubly-fed motor and the motor side converter; the grid-side filter is connected between the three-phase alternating-current power supply and the grid-side converter; the motor side converter is connected to the grid-side converter, and the direct current inductor is connected between the motor side emitter electrode ofthe motor side converter and the grid-side collector electrode of the grid-side converter; and the power winding of the doubly-fed motor is connected to the three-phase alternating-current power supply.

Description

technical field [0001] The invention relates to an asynchronous motor, in particular to a frequency conversion and speed regulation system of a doubly-fed motor based on a current source converter. Background technique [0002] The current source converter has many excellent characteristics, including good short-circuit protection capability, flexible and adjustable power factor, and high reliability, so it is widely used in the fields of motor drive, system energy grid connection, etc. With the emergence of new anti-resistance switches such as RB-IGBT, the switching frequency of current source converters has been greatly increased compared with before, so that the DC inductance, AC inductance and AC capacitance of current source converters have been greatly reduced, which means Compared with the voltage source converter, the current source converter has faster dynamic response, less cost and less volume. [0003] At present, current source PWM converters are mostly used in...

Claims

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Application Information

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IPC IPC(8): H02P21/22H02P27/08H02P25/02H02J3/38
CPCH02J3/381H02P21/22H02P25/02H02P27/085
Inventor 张建文蔡旭李沛元戚宏勋顾越岭韩晓辉
Owner CHINA POWER ENG CONSULTING GRP CORP EAST CHINA ELECTRIC POWER DESIGN INST
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