Transformer starting impulse current suppression system and method

A technology of starting inrush current and inrush current, which is applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problems of poor applicability, high hardware cost, and increased reactive power loss of circuits, so as to reduce the difficulty of transformation and improve Power quality, effect of hardware cost reduction

Pending Publication Date: 2020-02-25
CHINA ELECTRIC POWER RES INST +3
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Problems solved by technology

However, this method will lead to increased reactive power loss in the circuit, and the hardware cost is high, so the applicability is not strong

Method used

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  • Transformer starting impulse current suppression system and method
  • Transformer starting impulse current suppression system and method
  • Transformer starting impulse current suppression system and method

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Embodiment Construction

[0055] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0056] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0057] The present invention provides a transformer starting inrush current suppression system, such as figure 1 As shown, the system includes:

[0058] A group of three-phase reactor...

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Abstract

The invention relates to a transformer starting impulse current suppression system and method. The transformer starting impulse current suppression system comprises a group of three-phase reactors connected to a primary winding side of a transformer in parallel, an energy storage device connected with the three-phase reactors, and a controller of the energy storage device; the controller is used for judging whether the transformer generates impact current or not according to the measurement current of the primary winding side of the transformer, if so, generating a PWM pulse signal for controlling an inverter in the energy storage device according to the measurement voltage of the power grid side and the measurement current of the primary winding side of the transformer, and if not, controlling the energy storage device not to work. According to the transformer starting impact current suppression system provided by the invention, harmonic components, reactive components and attenuateddirect current components in transformer magnetizing impact current can be quickly and simultaneously compensated, and the power quality of a power grid side is improved; and the inverters of the energy storage device are connected to the power grid in parallel, so that the hardware cost and the transformation difficulty are remarkably reduced.

Description

technical field [0001] The invention relates to the field of power transformation equipment, in particular to a system and method for suppressing a transformer starting surge current. Background technique [0002] Since the iron core of the transformer is easily saturated, when the transformer is started with no load or light load, an inrush current several times or even dozens of times higher than its rated current will be generated. When the surge current flows into the power grid, it will inevitably lower the voltage level of the power grid, and at the same time cause serious asymmetry in the current and voltage waveforms of the power grid, which will trigger the relay protection action of the power grid. In a power grid with a small short-circuit capacity and during the black start of a large power grid, the inrush current generated by the transformer often leads to interruption of system power supply and failure of the black start of the power grid. Therefore, how to e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/18
CPCH02J3/01H02J3/1842Y02E40/30Y02E40/40
Inventor 胡安平李官军周晨陶以彬杨波余豪杰庄俊冯鑫振殷实俞斌马世乾赵长伟张子阳郦芳菲
Owner CHINA ELECTRIC POWER RES INST
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