Flywheel energy storage system and control method thereof

A technology of flywheel energy storage and control method, which is applied in the field of flywheel energy storage system and its control, can solve the problems such as unsatisfactory decoupling effect of current regulator, and achieve the effect of solving poor robustness

Inactive Publication Date: 2014-09-10
STATE GRID CORP OF CHINA +1
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Problems solved by technology

The reason is that the decoupling effect of the current regulator in the high-sp

Method used

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  • Flywheel energy storage system and control method thereof
  • Flywheel energy storage system and control method thereof
  • Flywheel energy storage system and control method thereof

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[0039] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0040] The present invention provides a flywheel energy storage system based on a complex vector PI current regulator, the topological structure diagram is as follows figure 1 As shown, the flywheel energy storage system includes two three-phase voltage-type PWM converters, LCL filters and DC support capacitors; the two three-phase voltage-type PWM converters are connected to each other through DC support capacitors connected in parallel on the DC bus , one of the three-phase voltage-type PWM converters is connected to the grid side through the output LCL filter, and the other three-phase voltage-type PWM converter is connected to the permanent magnet synchronous motor to supply power to the stator armature winding of the permanent magnet synchronous motor.

[0041] A discharge circuit is provided between the two three-...

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Abstract

The invention relates to a flywheel energy storage system and a control method thereof. The flywheel energy storage system comprises two three-phase voltage type PWM converters, an LCL filter and a direct current support capacitor; the two three-phase voltage type PWM converters are connected with each other through the direct current support capacitor connected with a direct current bus in parallel, wherein one three-phase voltage type PWM converter is connected with a power grid side through the output LCL filter while the other three-phase voltage type PWM converter is connected with a permanent magnet synchronous motor for powering the armature winding of the stator of the permanent magnet synchronous motor. The control method is achieved based on the control of a complex vector PI current regulator, and comprises a control strategy on the three-phase voltage type PWM converter at the power grid side, and a control strategy on the three-phase voltage type PWM converter at the motor side; according to the control method, dependence of the system on circuit parameters is eliminated, robustness of the system is increased, the pole-zero of the complex vector PI current regulator can be completely counteracted without being influenced by change of inductance parameters and the like, and thereby control performance is more outstanding.

Description

technical field [0001] The invention relates to an energy storage system and a control method thereof, in particular to a flywheel energy storage system and a control method thereof. Background technique [0002] Compared with other energy storage methods, flywheel energy storage has many advantages such as high energy storage density, wide operating temperature range, high power, low risk of overcharge and overdischarge, high efficiency, long life and no pollution [1]. The basic principle is to use the motor's power generation / electric dual-mode operation, and realize energy storage and release through the flywheel's speed up and down: when storing energy, the motor operates as a motor, absorbing energy from the grid to accelerate the motor rotor, and the electric energy Converted into kinetic energy; on the contrary, when the energy is released, the motor operates as a discharge machine, releasing energy to the grid to slow down the electronic rotor, and converting kinetic...

Claims

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Application Information

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IPC IPC(8): H02J3/30
CPCY02E60/16
Inventor 陈国富郭希铮蒋晓春蔡林海王江波
Owner STATE GRID CORP OF CHINA
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