Controller applied to power grid side converter of flywheel energy storage system

A flywheel energy storage and converter technology, which is applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components, etc., can solve the problems of sensitivity to changes in system parameters and poor dynamic performance.

Inactive Publication Date: 2015-06-03
哈尔滨功成科技创业投资有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

The control strategy of the grid-side converter can be divided into two types according to the current control mode: "indirect current control" and "direct current control". Sensitive, currently gradually replaced by "direct current control"

Method used

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  • Controller applied to power grid side converter of flywheel energy storage system
  • Controller applied to power grid side converter of flywheel energy storage system
  • Controller applied to power grid side converter of flywheel energy storage system

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Embodiment Construction

[0021] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0022] combine figure 1 , figure 1 is the topology of the grid-side converter. In order to simplify the mathematical model of the grid-side converter, the following assumptions are usually made: (1) ignore the saturation of the inductor; (2) ignore the conduction voltage drop of the switch tube and the anti-parallel diode; (3) ignore the influence of the dead zone, and It is considered that the driving signals of the switching tubes of the upper and lower bridge arms are complementary. Write the voltage equation for the above circuit as:

[0023] L di a dt + R · i a ...

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Abstract

The invention relates to a controller applied to a power grid side converter of a flywheel energy storage system. The controller comprises a simulation module, a current control module, a control system, the converter and an equivalent flywheel energy storage system model. The controller is characterized by simulating and analyzing the dynamic response performance of the power grid side power converter operating in rectification and inversion states and researching the correctness of the designed system and parameters. The topological structure of the power grid side converter is researched, a mathematical model of the power grid side converter is created, and a simulation model of the power grid side converter is constructed; according to the requirement of the balance of energy transmission between the flywheel energy storage system and a power grid, a current control technique for the power grid side converter, the control of active power and reactive power and a decoupling control policy are researched; a mathematical model of the post-coupling control system is given, control parameters are designed on the basis of an engineering design method, and a simulation program of the control system is constructed; a power grid voltage phase angle phase-locked loop technique and a PWM (Pulse-Width Modulation) control method for the converter are analyzed and researched, and an appropriate control method is chosen to meet the required total harmonic distortion index of alternating-current side power grid current.

Description

technical field [0001] The present invention relates to a controller applied to a power grid conversion device, in particular to a controller applied to a power grid side converter device of a flywheel energy storage system. Background technique [0002] Flywheel energy storage is a simple mechanical energy storage device, but it has received special attention as an electrical energy storage device in recent years. The modern flywheel system consists of mechanical parts such as flywheel body (rotor), protective cover, bearing and sealing device, power input and output parts such as motor generator set inverter, and supply parts such as vacuum pump and lubricating oil supply. The flywheel energy storage power conversion device is a bridge for the conversion of electrical energy and mechanical energy in the flywheel system. Domestic and foreign researchers mainly study the control of flywheel motors, converter modeling and simulation, and grid-connected technology. Flywheel e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/797H02J3/30
CPCY02E60/16H02M7/797H02J3/30
Inventor 苗惠
Owner 哈尔滨功成科技创业投资有限公司
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