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A voltage control method, device and system for preventing new energy cascading failures

A voltage control method and cascading failure technology, which are applied to circuit devices, AC network voltage adjustment, and emergency treatment of AC circuit layout, etc. Efficiency and computational convergence, boost and voltage safe operating levels, effect of reduced risk

Active Publication Date: 2021-11-23
SHENZHEN POWER SUPPLY BUREAU +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the existing technology, the above algorithm does not take into account the factors that the voltage drop after the new energy off-grid will lead to the low voltage of the new energy collection point or the new energy grid-connected side, which can easily cause chain off-grid accidents of new energy stations. It brings great threats and challenges to the safe operation of the power grid

Method used

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  • A voltage control method, device and system for preventing new energy cascading failures
  • A voltage control method, device and system for preventing new energy cascading failures
  • A voltage control method, device and system for preventing new energy cascading failures

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Embodiment 1

[0038] Such as figure 1 and 2 As shown, the voltage control method for preventing new energy cascading failures provided by the embodiment of the present invention includes the following steps:

[0039] Step 1: Determine the expected accident set of new energy off-grid, evaluate the impact of the expected accident set on the regional bus voltage and calculate the deviation of the bus voltage limit value.

[0040] Specifically, based on the regional scanning of N-1 expected accidents by new energy plants and stations, the accident sets that have a greater impact on the voltage generated by the safe operation of new energy collection areas are determined; the impact of each fault in the accident set on the regional bus voltage can be understood It is: calculate the busbar voltage variation according to multiple rounds of single new energy plant and station forecast accidents, and evaluate the influence of the forecasted accident set on the lower limit deviation of the bus volta...

Embodiment 2

[0054] Such as image 3 As shown, the embodiment of the present invention provides a voltage control device for preventing cascading faults of new energy sources, including the following modules:

[0055] Deviation calculation module: determine the new energy off-grid expected accident set, evaluate the impact of the expected accident set on the regional bus voltage and calculate the bus voltage limit deviation;

[0056] Control decision-making module: Combined with the bus voltage limit deviation, the secondary voltage control correction is performed, and the secondary voltage control decision is obtained to perform regional voltage coordination control.

[0057] Specifically, the control decision-making module can be used to judge and decide whether each reactive power source in the area can be adjusted to avoid or reduce the voltage limit of the expected accident of new energy off-grid. If the regional calculation converges, the regional control decision is determined; if t...

Embodiment 3

[0059] An embodiment of the present invention provides a voltage control device for preventing new energy cascading failures, including a processor and a storage medium;

[0060] The storage medium is used to store instructions;

[0061] The processor is configured to operate according to the instructions to execute the steps of the voltage control method in the second embodiment.

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Abstract

The invention discloses a voltage control method, device and system for preventing cascading failures of new energy sources, belonging to the technical field of power system operation and control. The voltage control method includes determining a set of expected accidents of new energy off-grid, and evaluating and calculating the expected accidents The impact on the regional bus voltage is collected, and the bus voltage limit deviation is calculated; the bus voltage limit deviation is brought into the secondary voltage correction model, and the secondary voltage control decision is obtained to perform regional voltage coordination control. The invention solves the problem of continuous off-grid of new energy caused by a large change in off-grid voltage of a single new energy plant, can eliminate or reduce the degree of grid voltage over-limit after a single fault, and improve the safety of grid-connected voltage of new energy.

Description

technical field [0001] The invention relates to a voltage control method, device and system for preventing cascading faults of new energy sources, and belongs to the technical field of power system operation and control. Background technique [0002] The secondary voltage control is the core function to realize the decision-making of reactive power and voltage in the new energy cluster grid-connected area. It can realize the reactive power and voltage coordination strategy of various reactive sources in the area, ensure the voltage constraints of each node, and has good convergence and universal applicability. sex. However, in the existing technology, the above algorithm does not consider the factor that the voltage drop after the new energy is disconnected from the grid will cause the voltage of the new energy collection point or the new energy grid connection side to be too low. It brings great threats and challenges to the safe operation of the power grid. Contents of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/12H02J3/16H02J3/00
CPCH02J3/12H02J3/16H02J3/001Y02E40/30
Inventor 李志陈建华苟吉伟陈天华梅鹏林子钊闪鑫邓彬杜磊刘铠徐陆飞叶振豪陈栋
Owner SHENZHEN POWER SUPPLY BUREAU
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