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Energy storage planning method based on power system transient stability as well as system

A technology for transient stability, power systems, applied in electrical components, circuit devices, AC network circuits, etc.

Pending Publication Date: 2019-04-16
CHINA ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] These studies mainly apply energy storage to emergency control, but there are few studies on power system planning, scheduling, and preventive control considering economy and safety.

Method used

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  • Energy storage planning method based on power system transient stability as well as system
  • Energy storage planning method based on power system transient stability as well as system
  • Energy storage planning method based on power system transient stability as well as system

Examples

Experimental program
Comparison scheme
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Embodiment

[0175]The present invention verifies the feasibility of the method through the improved IEEE39 node system, and the system reference power is 100MW. Lines 4-14 are replaced with HVDC lines with rated voltage and rated power of 500kV and 500MW respectively. Improved IEEE 39 node systems such as image 3 shown. Predictions based on historical statistical data are estimated as shown in Table 1, where zero-sequence and negative-sequence impedances are both 0.4 p.u. in ground faults.

[0176] Table 1 Expected accident set

[0177]

[0178] Uncertain scene sampling:

[0179] Generate 500 generator output scenarios through good point set sampling and Monte Carlo random sampling, such as Figure 4 shown.

[0180] The present invention quantifies the sampling effect based on information entropy, and obtains the information entropy curves of the two sampling methods by gradually increasing the number of samples, such as Figure 5 shown.

[0181] The present invention passes ...

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Abstract

The invention relates to an energy storage planning method based on power system transient stability as well as a system. An energy storage access position, output power of a generator as well as amplitude and a phase angle of a node voltage are taken as optimization variables and are input a transient stability risk mitigation model constructed in advance; and according to an objective function and constraint conditions of the transient stability risk mitigation model, an optimal configuration scheme is determined, wherein the transient stability risk mitigation model is constructed on the basis of minimization of energy storage and generator output power costs as well as predefined transient stability risk indicators, and the transient stability risk indicators are developed according tofault severity and fault occurrence probability of an uncertain scene.

Description

technical field [0001] The invention relates to a method and a system, in particular to an energy storage planning method and system based on transient stability of a power system. Background technique [0002] In recent years, with the widespread application of high-voltage AC-DC transmission systems, the operating point of the power system has been pushed to the boundary of the stable point, which may lead to cascading failures and large-scale blackouts. Therefore, risk indicators for effectively quantifying the stability of AC and DC power systems are very much needed, and then based on the risk indicators, preventive control that takes safety and economy into account can be realized. [0003] The risk-based transient stability index mainly considers the probability of failure and the severity of expected failure, and has been widely used in power system safety assessment and preventive control. Some scholars have proposed a risk-based safety index that considers failure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/28
CPCH02J3/00H02J3/28H02J2203/20
Inventor 崔红芬姚良忠叶季蕾杨波庄俊桑丙玉李官军王德顺薛金花刘友波
Owner CHINA ELECTRIC POWER RES INST
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