Method for improving voltage sag endurance capacity of frequency converter without participation of energy storage equipment

A technology of voltage sag and energy storage equipment, which is applied in the direction of electrical components, control of generators, motor control, etc., can solve the problems of increased control complexity, increased equipment cost, and high total cost, and achieves improved voltage sag tolerance capability, the effect of enhancing robustness

Active Publication Date: 2020-10-13
ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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Problems solved by technology

However, this solution not only increases the equipment cost, but also greatly improves the complexity of the control. The switching devices inside the DC-BANK also need regular maintenance, so the total cost is relatively high.

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  • Method for improving voltage sag endurance capacity of frequency converter without participation of energy storage equipment
  • Method for improving voltage sag endurance capacity of frequency converter without participation of energy storage equipment
  • Method for improving voltage sag endurance capacity of frequency converter without participation of energy storage equipment

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Embodiment Construction

[0077] The speed fuzzy PI controller and the algorithm included in the field weakening control in the present invention and the application in the fuzzy field weakening-vector controller.

[0078] Below in conjunction with specific embodiment, the present invention is further elaborated, and specific technical scheme is as follows:

[0079] A fuzzy PI controller is proposed to replace the original PI controller to enhance the robustness of the control system to system parameter changes; the flux-weakening control is used to change the reference value of the flux linkage in the case of sag, so that the energy to maintain the magnetic field Torque current transfer. The combination of the two improves the voltage sag tolerance capability of the inverter. Fuzzy field weakening-vector controller internal modules such as Figure 6 shown.

[0080] The fuzzy flux-weakening-vector control strategy controller (hereinafter referred to as "controller") includes abc-dq coordinate transf...

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Abstract

The invention discloses a method for improving the voltage sag endurance capacity of a frequency converter without participation of energy storage equipment. On the basis of the mode of improving thevoltage sag endurance capability of the frequency converter, a structure adopting external energy storage equipment or extra equipment is abandoned and a fuzzy flux weakening-vector control strategy is provided, so that the voltage sag endurance capability of the frequency converter is enhanced and the cost for improving the voltage sag endurance capability is reduced; in order to solve the technical problem, the invention provides a method for improving the voltage sag endurance capacity of a frequency converter without participation of energy storage equipment; a fuzzy flux weakening-vectorcontrol strategy is employed to control a frequency converter; and a fuzzy PI controller is used to replace an original PI controller so as to enhance the robustness of a control system to system parameter changes; and flux-weakening control is adopted, and a flux linkage reference value is changed under the condition of sag, so that the energy of the magnetic field is maintained to be transferredto torque current. The combination of the two improves the voltage sag endurance capability of the frequency converter.

Description

technical field [0001] The invention discloses a method for improving the voltage sag tolerance capacity of frequency converters without the participation of energy storage equipment, and belongs to the technical field of industrial speed-regulating production equipment. Background technique [0002] The frequency converter is often used to control the speed of rotating equipment by converting the voltage with fixed amplitude and frequency into a voltage that changes with actual needs. It is an ideal speed regulation solution for induction motors. Through control strategy control, energy saving during the operation of changing load torque and changing the speed of induction motor, reducing mechanical and thermal stress through soft start; through acceleration, deceleration, remote communication and control, simple maintenance and automatic diagnosis are Some advantages of frequency converters. The frequency converter can be divided into 5 parts as a whole: rectifier bridge,...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H02P21/00H02P21/22
CPCH02P21/001H02P21/0089H02P21/22H02P2205/01
Inventor张敏王金浩常潇李胜文张世锋樊瑞赵军李冉高乐
OwnerELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER