PMSM (permanent magnet synchronous motor) grid-connected operation control method and system, and quasi-synchronization controller

A technology for permanent magnet synchronous motors and motor controllers, which is applied in the direction of synchronous generator control, control systems, and control generators. The effect of improving efficiency and reducing equipment investment

Inactive Publication Date: 2015-11-11
SHENZHEN INST OF ADVANCED TECH
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a permanent magnet synchronous motor grid-connected operation control method, system and quasi-synchronous controller, aiming to solve th

Method used

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  • PMSM (permanent magnet synchronous motor) grid-connected operation control method and system, and quasi-synchronization controller
  • PMSM (permanent magnet synchronous motor) grid-connected operation control method and system, and quasi-synchronization controller
  • PMSM (permanent magnet synchronous motor) grid-connected operation control method and system, and quasi-synchronization controller

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[0045] 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. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0046] In order to illustrate the technical solutions of the present invention, specific examples are used below to illustrate.

[0047] An embodiment of the present invention provides a method for controlling the grid-connected operation of a permanent magnet synchronous motor, such as figure 1 As shown, the control method includes the following steps:

[0048] Step S101. Obtain grid frequency and grid voltage.

[0049] In this step, specifically, the AC signal on the grid side is collected, and the AC signal on the grid side is also an input signal of the motor controller.

[0050] Step S102. ...

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Abstract

The invention relates to the technical field of motor control, and provides a PMSM (permanent magnet synchronous motor) grid-connected operation control method and system, and a quasi-synchronization controller. The method comprises the following steps: obtaining the frequency and voltage of a power grid; detecting the output frequency, output voltage and phase of a motor controller in a process that the motor controller drives a motor to operate; adjusting the rotating speed of the motor through the motor controller according to the frequency of the power grid, wherein the output frequency is the same as the frequency of the power grid; controlling the motor to carry out grid-connected operation when the output voltage of the motor controller and the voltage of the power grid are judged to meet conditions of grid-connected operation, enabling a PMSM to operate without the controller, and enabling the efficiency of an operation system to be improved. Moreover, the method achieves the feedback of energy when the motor is in a state of power generation. The energy saving of the system is achieved through employ less equipment cost.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a method and system for controlling the grid-connected operation of a permanent magnet synchronous motor and a quasi-synchronous controller. Background technique [0002] At present, in the pumping unit in the oil field, when the head of the pumping unit is descending, the motor will work as a generator. In order to overcome the waste of electric energy in the traditional pumping unit system, the DC bus of the inverter is connected in parallel, and an external The braking resistor and the controller can realize the reutilization of the electric energy of each pumping unit motor in the same well site and the peak shift control of the pumping unit power through real-time detection and control of the frequency conversion parameters of the frequency converter. Using the reverse electric energy of each pumping unit motor as the power electric energy of other pumping unit motors ...

Claims

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Application Information

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IPC IPC(8): H02J3/42H02P9/00H02P103/20
Inventor 刘益卯吴正斌杨帅
Owner SHENZHEN INST OF ADVANCED TECH
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