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Fast Voltage Regulation and Grid Connection Method for Generator-Motor of Vertical Gravity Energy Storage Systems | IEEE Conference Publication | IEEE Xplore

Fast Voltage Regulation and Grid Connection Method for Generator-Motor of Vertical Gravity Energy Storage Systems

Publisher: IEEE

Abstract:

The basic requirement of the grid connection of the gravity energy storage generator-motor is that the voltage phase sequence, frequency, amplitude and phase of the machi...View more

Abstract:

The basic requirement of the grid connection of the gravity energy storage generator-motor is that the voltage phase sequence, frequency, amplitude and phase of the machine end and the network end need to be consistent. However, when the actual gravity energy storage system is connected to the grid, due to the different start-up and grid-connected methods, as well as the deviation of the control system, it is difficult to make the voltage indicators of the terminal and the network terminal completely consistent, which in turn generates transient impulse current. In view of the above problems, this paper establishes a grid-connected model of vertical gravity energy storage system, and proposes a grid-connected method of gravity energy storage generator-motor based on fast voltage regulation control. Through simulation verification, this method can make the three-phase current of motor stator smoothly transition to steady state after grid-connected, and achieve the purpose of suppressing grid-connected impulse current. The correctness and practicability of the proposed method are fully verified.
Date of Conference: 15-16 December 2023
Date Added to IEEE Xplore: 13 June 2024
ISBN Information:
Publisher: IEEE
Conference Location: Xi'an, China

I. Introduction

When the gravity energy storage is connected to the grid, the terminal voltage of the generator-motor must be consistent with the grid voltage in phase sequence, phase, amplitude and frequency to ensure the safe and stable operation of the whole system after the motor is connected to the grid[1]. However, in the actual gravity energy storage system, there is always a certain error in the voltage index of the generator-motor terminal and the grid terminal, and then the transient impulse current is generated. In the actual gravity energy storage system, there is always a certain error in the voltage index of the generator-motor terminal and the grid terminal, and then the transient impulse current is generated [2]–[4]. In addition, because the generator-motor group of the gravity energy storage system is different from the conventional generator set, it needs to switch frequently between the charging and discharging operating conditions according to the requirements of the power grid, and each switch needs to complete the start and grid connection of the generator-motor. In the case of frequent grid connection at this time, if there is always a large error in the voltage index of the machine end and the grid end, a stable transient impulse current will be generated. If there is no human intervention and control, long-term operation will bring hidden dangers to the safety of the grid-connected system, causing a series of problems such as equipment aging or even damage [5].

References

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