Method and system for controlling phase commutation sequence

A phase-sequence control and phase-sequence technology, applied in the direction of single-network parallel feed arrangement, etc., can solve the problems affecting the safe and stable operation of the power system and the hazards of the power system, and achieve the effect of improving safety and stability and reducing impact

Active Publication Date: 2020-11-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the overvoltage and overcurrent generated by the simultaneous opening and closing of the solid state circuit breaker on the three-phase line during the phase commutation sequence will cause harm to the power system and affect the safe and stable operation of the power system

Method used

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  • Method and system for controlling phase commutation sequence
  • Method and system for controlling phase commutation sequence
  • Method and system for controlling phase commutation sequence

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Embodiment Construction

[0070] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. 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.

[0071] The purpose of the present invention is to provide a commutation sequence control method and system, which can reduce the impact of the commutation sequence process on the power system and improve the safety and stability of the power system.

[0072] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying...

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Abstract

The invention discloses a phase sequence change control method and system. The method comprises: obtaining a power angle of a power generator in real time; if the power angle is greater than a presetthreshold, controlling the connection line of a corresponding current zero-crossing phase to disconnect to realize opening when the current of a certain phase, in a connected state, of the power generator and a power system passes zero; and after connection of phases between the power generator and the power system is disconnected, when the voltage of a certain phase in a disconnected state at thepower generator side is equal to the voltage of a certain phase in a disconnected state at the power system side, connecting the line of the phase in the disconnected state at the power generator side with the line of the phase in the disconnected state at the power system side, wherein the voltages of the phases are equal, until lines of all phases at the power generator side and the power system side are connected. When opening is realized at the current zero crossing point, the produced surge voltage is minimum, and when closing is realized when the voltage is equal, the produced surge current is minimum, thereby reducing impact on the power system during phase sequence change process, and improving safety and stability of the power system.

Description

technical field [0001] The invention relates to the technical field of power system stability control, in particular to a method and system for controlling a phase commutation sequence. Background technique [0002] Power grid security and stability emergency control system is an effective measure to improve the stability of the power system and ensure the safe and stable operation of the power grid. Emergency control refers to the control that the power system enters into an emergency state or an extreme emergency state due to disturbances to prevent system stability from being damaged, operating parameters seriously exceeding the specified range, and accidents further expanding to cause large-scale power outages. Emergency control can not only maintain the safety and stability of the system after a serious fault with a certain control cost, but also can increase the transmission power of some transmission lines whose transmission capacity is limited by the transient stabil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/46
CPCH02J3/46
Inventor 黄少锋李轶凡李慧张健黄怡凌高琦徐泰来郭日泽李靖雯
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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