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Reactive power optimization method and system based on weak points of power grid

An optimization method and weak point technology, applied in the field of reactive power optimization method and system, can solve problems such as weak and unable to effectively adjust voltage

Active Publication Date: 2021-06-22
山东国瑞电力科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing controllable equipment should cooperate with online voltage stability analysis, quantitatively adjust according to the voltage operation level and control strategy, and maintain the voltage stability and voltage operation level of the power grid, mainly including: group switching shunt compensator; load regulation transformer; Phase shifter with load; generator terminal voltage regulation; load shedding and other control strategies; the inventor found in the research that there are voltage weaknesses that cannot be effectively adjusted in the existing control regulation strategy

Method used

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  • Reactive power optimization method and system based on weak points of power grid
  • Reactive power optimization method and system based on weak points of power grid
  • Reactive power optimization method and system based on weak points of power grid

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Embodiment 1

[0055] This embodiment discloses a reactive power optimization method based on the weak point of the power grid, including:

[0056] Step 1: Define the weak points of the grid based on the voltage stability and local bifurcation theory of the grid;

[0057]Step 2: Define the load growth model based on the predicted load and power generation plan, and use the continuous power flow method to identify the weak points of the grid;

[0058] Step 3: Quickly analyze the voltage stability under the expected fault set based on the sensitivity method and Look-Ahead;

[0059] Step 4: Design preventive and enhanced control measures based on linear control theory.

[0060] Regarding step 1, it should be noted that the determination of weak nodes is an important part of voltage stability research. These nodes generally have the following characteristics:

[0061] Has the highest voltage breakdown point on the V-Q curve;

[0062] Minimum reactive power margin;

[0063] Most reactive powe...

Embodiment 2

[0209] The purpose of this embodiment is to provide a computing device, including a memory, a processor, and a computer program stored in the memory and running on the processor. step.

Embodiment 3

[0211] The purpose of this embodiment is to provide a computer-readable storage medium.

[0212] A computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, executes the specific steps in Example 1 of the foregoing embodiment.

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Abstract

The invention provides a reactive power optimization method and system based on a weak point of a power grid. The method comprises the following steps: analyzing and evaluating the dynamic stability characteristics of a power system and a basic value of a system margin through employing a nonlinear dynamic system, and obtaining a weak link of the power grid based on the basic value; calculating a PV curve after the fault aiming at the weak link of the power grid; and based on the PV curve, respectively controlling elements related to active power distribution and elements related to reactive power and voltage to optimize a voltage reactive power control scheme. The reliability, the accuracy and the precision of the power grid weak link analysis method are verified, and the reliability and the accuracy of a reactive power optimization scheme implemented for weak points under the conditions of different operation modes, different load conditions and the like are verified.

Description

technical field [0001] The present disclosure belongs to the technical field of power grids, and in particular relates to a reactive power optimization method and system based on the weak point of the power grid. Background technique [0002] With the rapid development of society and economy, the construction of power facilities is not enough to meet people's growing demands, and the power grid is running at full load or even overload most of the time. To ensure the safe and stable operation of the power system, in some After a sudden accident occurs, to take fast and safe control measures, it is necessary to carry out a safety and stability analysis of the power system in advance. The identification and analysis of the weak links in the power grid is an important part of the power system security and stability analysis. [0003] One of the most common characteristics in the process of voltage collapse is that the system cannot meet the reactive power demand on some nodes o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/16
CPCH02J3/16H02J2203/10Y02E40/30
Inventor 闫红华张传平
Owner 山东国瑞电力科技有限公司
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