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Modulation ratio control method based on voltage closed loop of flywheel energy storage asynchronous generator

An asynchronous generator and voltage closed-loop technology, which is applied in the direction of asynchronous generator control, generator control components, motor control, etc., can solve the problems of complex control algorithm, limited application range, and difficult implementation, and realize the current limiting function and overcurrent protection, low price and cost, and easy to implement

Inactive Publication Date: 2016-05-04
SHANGHAI UNIV
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Problems solved by technology

[0005] Slip frequency control and rotor field orientation both need to detect the motor speed, need to install a speed sensor, and the application range is limited; although direct torque control does not need to detect the motor speed, the estimation of the stator flux linkage is affected by the motor parameters, and the control algorithm is complicated. Not easy to achieve

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  • Modulation ratio control method based on voltage closed loop of flywheel energy storage asynchronous generator
  • Modulation ratio control method based on voltage closed loop of flywheel energy storage asynchronous generator
  • Modulation ratio control method based on voltage closed loop of flywheel energy storage asynchronous generator

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Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] Such as figure 1 As shown, a closed-loop modulation ratio control method based on the flywheel energy storage asynchronous generator voltage uses the modulation ratio as the main control variable to achieve a stable output of the generated voltage. The specific steps are as follows:

[0025] 1) First, according to the given DC bus voltage value U dc * and the actual detected feedback voltage value U dc Make a difference, and send the obtained result to the PI regulator 3 and the limiting unit 4, thereby obtaining the control command signal M of the modulation ratio * ;

[0026] 2) if figure 2 shown, then according to the flywheel deceleration curve, the flywheel motor at t 0 At the moment with the initial generating frequency f 0 Start to slow down until t 1 time, the frequency drops to the minimum frequency f of the f...

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Abstract

The invention relates to a modulation ratio control method based on voltage closed loop of a flywheel energy storage asynchronous generator. The modulation ratio control method comprises the steps of comparing a direct current bus voltage given value with an actually detected feedback value, and obtaining a modulation ratio given value after the comparison result passes through a PI controller and an amplitude limiting module; meanwhile, giving the stator frequency; calculating and obtaining a carrier wave ratio through a flywheel speed reduction curve and an f / fc unit (as shown in the specification); then calculating the turn-on time of a switch tube according to the modulation ratio and the carrier wave ratio to generate an SPWM wave for controlling on and off of a power converter power module so as to further control the frequency of a high-speed asynchronous motor stator dragged by the flywheel to enable the frequency to be lower than the rotating speed of the flywheel constantly; and enabling the motor to be an energy feedback state so as to convert the mechanical energy stored by the flywheel into electric energy to realize power generation. According to the method, the modulation ratio is taken as the main control quantity; the stable output of the power generation voltage can be realized, and the rotor position information is not required to be detected; and meanwhile, the control algorithm is simple and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of new energy power generation, and in particular relates to a modulation ratio control method based on a flywheel energy storage asynchronous generator voltage closed-loop. Background technique [0002] The flywheel energy storage system is a typical high-tech mechatronic system, combining new technologies such as magnetic levitation technology, high-speed motor technology, vacuum technology, power electronics technology and composite materials to achieve high-efficiency energy conversion. Flywheel has high energy storage density, high energy conversion rate, long service life, short charging time, suitable for various environments, repeatable deep discharge, and simple maintenance. It is a green energy technology with broad application prospects. [0003] The control methods of flywheel energy storage asynchronous generator mainly include open-loop control and closed-loop control. Among them, the open-loo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/00H02P9/02H02P103/10
CPCH02P9/00H02P9/02H02P2207/01
Inventor 仇志坚曾程魏康妮陈威杨进
Owner SHANGHAI UNIV
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