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Flexible ac transmission system (FACTS) interactive influence degree evaluation method based on modal series method

A technology of interactive influence and series, applied in the field of power system, can solve problems such as ignoring the influence of high-order items on system response, unable to quantitatively point out the degree of interactive influence between devices and controls, and unable to accurately predict system behavior, etc., to achieve physical meaning Clear, Adaptable Effects

Active Publication Date: 2012-07-11
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

The disadvantages of existing evaluation methods and analysis methods are that they cannot quantitatively point out the degree of interaction between devices and controls, and linear analysis ignores the impact of high-order terms on system response, so it often cannot accurately predict system behavior. Power system analysis under small disturbance conditions

Method used

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  • Flexible ac transmission system (FACTS) interactive influence degree evaluation method based on modal series method
  • Flexible ac transmission system (FACTS) interactive influence degree evaluation method based on modal series method
  • Flexible ac transmission system (FACTS) interactive influence degree evaluation method based on modal series method

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Embodiment Construction

[0029] The following is an implementation example of the present invention: a 4-machine 2-area system equipped with 2 SVCs is used as an example for simulation calculation. Further explanation is as follows:

[0030] The structure of the 4 machine 2 area system is as follows figure 1 shown. The evaluation method of FACTS interaction influence degree based on the modal progression method specifically includes the following steps:

[0031] 1) Change the size of the system reactive loads Load1 and Load2 to form different system operating conditions.

[0032] Working condition 1: Load1: -150MVar, Load2: -150MVar;

[0033] Working condition 2: Load1: -100MVar, Load2: -100MVar;

[0034] Working condition 3: Load1: -50MVar, Load2: -50MVar;

[0035] 2) Use the formula (2) to calculate the indicators under the three working conditions.

[0036] The indicators under the three working conditions are: working condition 1: 5.5873; working condition 2: 9.5779; working condition 3: 28....

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Abstract

The invention provides a flexible ac transmission system (FACTS) interactive influence degree evaluation method based on a modal series method, which comprises the following steps: a step A of providing system running conditions in a power system containing a FACTS device; a step B of inputting basic data of the system under each system running condition; a step C of performing load flow calculation to obtain a stable equilibrium point of the system; a step D of calculating nonlinear degree indexes; a step E of performing a step F if the calculation of the nonlinear degree indexes of all the system running conditions are finished, or else returning to the step B; and a step F of comparing the sizes of all the nonlinear degree indexes. The FACTS interactive influence degree evaluation method based on the modal series method has the advantages of being strong in application and definite in physical significance, can provide accurate guide for coordinated running of a plurality of FACTS, and can serve as measuring indexes for the nonlinear degree of the system to provide research methods for the work of power system analysis, stability study and the like.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a FACTS interaction influence degree evaluation method based on a modal series method. Background technique [0002] Existing Flexible AC Transmission System (FACTS) equipment is mostly controlled based on local information, and there are many types of devices, and they are all individually designed and installed for different purposes, and there is a lack of coordination between the equipment. In recent years, relevant studies have shown that this situation will lead to adverse interaction between FACTS equipment and weaken the control effect of FACTS. Moreover, with the expansion of the scale of the interconnected grid in the future, there will be more and more places where FACTS equipment is installed, and this interactive influence will become more and more serious, which will cause more and more harm to the system stability. [0003] How to systematically evaluate t...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/38
Inventor 黄柳强孙华东易俊
Owner CHINA ELECTRIC POWER RES INST
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