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Method and system for reducing power mismatching degree between sub-intervals of power system

A power system and matching degree technology, applied in the direction of reducing/preventing power oscillation, wind power generation, electrical components, etc., can solve power system dispatching interval power mismatch, no power system sub-interval power mismatch, system frequency offset, etc. question

Active Publication Date: 2021-01-29
HUNAN UNIV +3
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  • Application Information

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Problems solved by technology

In fact, when the wind power fluctuates nonlinearly, the above assumptions will no longer hold true, that is, there may be a power mismatch phenomenon within the power system dispatching interval, and the problem of power mismatch between the power system dispatching sub-intervals can be solved.
When the wind power fluctuates violently, the maximum power mismatch between the power system sub-intervals may exceed the system reserve capacity, resulting in system frequency deviation and seriously affecting the safe operation of the power system.
[0003] However, no effective solution has been proposed for power system subinterval power mismatch problem
Considering that the power mismatch of the power system will bring serious security risks to the system, it is urgent to propose a method to reduce the power mismatch of the sub-intervals of the power system to ensure the safety of the power system dispatching interval.

Method used

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  • Method and system for reducing power mismatching degree between sub-intervals of power system
  • Method and system for reducing power mismatching degree between sub-intervals of power system
  • Method and system for reducing power mismatching degree between sub-intervals of power system

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Embodiment Construction

[0051] figure 1 The implementation process of the method for reducing the power mismatch degree in the scheduling interval is given, and the specific steps are as follows:

[0052] S1: Input the predicted value of wind power at both ends of the dispatch interval in and Represents the initial predicted value of wind power of the i-th wind farm at both ends of the scheduling interval before the iteration, T 0 and T 1 Respectively represent the beginning (start time) and end (end time) of the scheduling interval.

[0053] S2: Set a safety threshold R max , on this basis, set a safety threshold critical value γ; set the initial number of iterations k = 0; set the initial abandoned wind power at the end of the scheduling interval T1 as W k =0. Initialize wind power: in and Respectively represent the wind power forecast values ​​at both ends of the scheduling interval of the i-th wind farm updated in the k-th iteration.

[0054] Among them, the initialization parame...

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Abstract

The invention discloses a method and a system for reducing the power mismatching degree of sub-intervals of a power system, and the method comprises the steps: building a linear programming model forthe safety risk assessment of the sub-intervals of the power system through the comprehensive consideration of the climbing parameters of the short-term fluctuation of wind power and the related constraints of economic dispatching, and calculating the power mismatching degree of the sub-intervals of the power system at all moments; according to the power mismatching degree, obtained by the model,of each moment of the sub-interval, providing a new prevention scheduling model for reducing the maximum power mismatching degree of the sub-interval, and finally reducing the maximum power mismatching degree of the sub-interval to be within a safety threshold value through finite times of iteration, and therefore, it is ensured that the system reserve capacity can completely compensate for the power mismatching degree of the power system subintervals. According to the invention, the power mismatching degree of the sub-intervals of the power system is effectively reduced to be within the safety threshold on the basis of not sacrificing excessive economy, the safety of the interior of the whole dispatching interval of the power system is guaranteed, and the safety and reliability of the power system are improved.

Description

technical field [0001] The invention relates to the technical field of power system dispatching security, and relates to a method and system for reducing the power mismatch degree in a power system dispatching section. Background technique [0002] In recent years, the proportion of wind power generation in the total power generation of the power system in various countries has gradually increased. However, wind power has volatility and uncertainty, which brings great safety risks to the operation of the power system, such as power imbalance, line overload and other issues. In traditional power system dispatching methods, a common assumption is followed: when the power at both ends of the power system dispatching interval satisfies balance, the power balance inside the dispatching interval can also be guaranteed. In fact, when the wind power fluctuates nonlinearly, the above assumptions will no longer hold true, that is, there may be a power mismatch phenomenon within the p...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/46
CPCH02J3/24H02J3/466H02J2203/10H02J2203/20H02J2300/28Y02E10/76
Inventor 刘绚鲁文格李明节董存范高锋梁志峰范维刘思扬
Owner HUNAN UNIV
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