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Direct starting device and control method of cage-type asynchronous generator with asynchronous motor

A technology for asynchronous generators and asynchronous motors, applied to the control of generators, control systems, harmonic reduction devices, etc., can solve the problem of reducing the energy conversion efficiency of the generator system, the impact voltage of the cage-type asynchronous generator, and increasing the electromagnetic loss of the generator etc. to achieve the effects of shortening the execution time of microcomputer code, improving dynamic response speed and transient characteristics, and suppressing stator harmonics

Active Publication Date: 2019-03-29
GUANGXI UNIV
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Problems solved by technology

And the carrying capacity is poor, usually its carrying capacity is 25% of its rated capacity
Especially in oil and gas exploration, large-capacity asynchronous motors are required, and their starting current is usually 4-7 times their own rated current, which has a great impact on the cage-type asynchronous generator, causing a large drop in voltage or even a voltage collapse
The asynchronous motor is a resistance-inductive nonlinear dynamic load, which will bring a large component of harmonics during operation, which is very unfavorable to the generator system; harmonics will cause distortion of the generator output waveform and increase the electromagnetic loss of the generator , reducing the energy conversion efficiency of the generator system

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  • Direct starting device and control method of cage-type asynchronous generator with asynchronous motor
  • Direct starting device and control method of cage-type asynchronous generator with asynchronous motor
  • Direct starting device and control method of cage-type asynchronous generator with asynchronous motor

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] Such as figure 1 As shown, the present invention discloses a direct starting device for a cage-type asynchronous generator with an asynchronous motor, including a prime mover 1, a cage-type asynchronous generator 2, an excitation capacitor 3, a DSTATCOM (static synchronous compensator 4), an asynchronous motor 5 and DSP controller.

[0027] The prime mover 1 is connected to the cage-type asynchronous generator 2, and the cage-type asynchronous generator 2 is connected in parallel with the excitation capacitor 3, and the excitation capacitor 3 is the cage-type asynchronous generator 2 to ensure self-excited voltage building. DSTATCOM and the asynchronous motor 5 are connected in parallel to the common coupling point at the end of the cage-ty...

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Abstract

The invention discloses a direct starting device of a cage-type asynchronous power generator with an asynchronous motor. The direct starting device comprises a prime motor, a cage-type asynchronous power generator, an excitation capacitor, a distribution static compensator (DSTATCOM), an asynchronous motor and a digital single processor (DSP) controller, wherein the prime motor is connected with the cage-type asynchronous power generator, the cage-type asynchronous power generator is connected in parallel with the excitation capacitor, the DSTATCOM and the asynchronous motor are connected in parallel to a common coupling point of a motor end of the cage-type asynchronous motor, and the DSP controller is connected with the DSTATCOM and is used for executing and implementing a control algorithm. The invention also discloses a control method of the above device. With the adoption of a dual-closed-loop control strategy and the introduction of an instantaneous power balance theory and harmonic voltage feedforward control of the coupling point, the harmonic interference of a non-linear load such as the asynchronous motor is suppressed, and the direct starting of the cage-type asynchronous power generator with the large-capacity asynchronous motor is achieved.

Description

technical field [0001] The invention relates to the technical field of power quality and distributed power generation, in particular to a direct starting device for a cage-type asynchronous generator with an asynchronous motor and a control method. Background technique [0002] In many remote areas of our country, the extension of the power grid requires a lot of investment, and these areas are often rich in wind energy, water energy, especially large oil and mineral reserves; many equipment for oil and mineral exploration require electric energy. It is more economical and feasible to use the wind energy or hydropower in these places to generate electricity for the load in this area. [0003] Among many generators for distributed power generation, the cage-type asynchronous generator has the advantages of simple structure, durable, cheap, easy maintenance, etc., and is widely used in independent power generation systems. The cage-type asynchronous generator needs an externa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P9/00H02J3/18H02J3/01
CPCH02J3/01H02J3/18H02P9/00Y02E40/10Y02E40/30Y02E40/40
Inventor 卢子广张文元林靖宇胡立坤张力刘博文
Owner GUANGXI UNIV
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