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Voltage control method, device and system for preventing new energy cascading failure

A voltage control method and technology of cascading faults, which are applied in the direction of circuit devices, AC network voltage adjustment, emergency treatment AC circuit layout, etc., can solve problems such as cascading off-grid accidents of new energy stations and threats to safe operation of power grids

Active Publication Date: 2020-10-27
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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  • Voltage control method, device and system for preventing new energy cascading failure
  • Voltage control method, device and system for preventing new energy cascading failure

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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 a new energy cascading failure, and belongs to the technical field of power system operation and control. The methodcomprises the steps: determining a new energy off-network anticipated accident set, evaluating and calculating the impact on the regional bus voltage from the anticipated accident set, and calculatingthe bus voltage limiting value deviation; and substituting the bus voltage limit value deviation into a secondary voltage correction model to obtain a secondary voltage control decision to carry outintra-regional voltage coordination control. The problem of continuous off-grid of new energy caused by great change of off-grid voltage of a single new energy plant station is solved, the out-of-limit degree of grid voltage after a single fault can be eliminated or reduced, and the safety degree of new energy grid-connected voltage is improved.

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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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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