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Secondary synchronous oscillation evaluation method and system based on wind energy HVDC outward delivery system

A technology of subsynchronous oscillation and external transmission system, applied in the direction of reducing/preventing power oscillation, AC network circuit, electrical components, etc., can solve the problem of subsynchronous oscillation risk without evaluation basis, etc., to increase the assessment of indicators and expand the scope of application , the index value comprehensive and accurate effect

Inactive Publication Date: 2019-04-05
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology

[0004] However, at present, there is no corresponding assessment basis for the subsynchronous oscillation risk of large-scale wind power transmission through HVDC

Method used

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  • Secondary synchronous oscillation evaluation method and system based on wind energy HVDC outward delivery system
  • Secondary synchronous oscillation evaluation method and system based on wind energy HVDC outward delivery system
  • Secondary synchronous oscillation evaluation method and system based on wind energy HVDC outward delivery system

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Embodiment Construction

[0049] According to the phenomenon of subsynchronous oscillation caused by wind turbines, there are mainly three types: IGE (induction generator effect, IGE), SSCI (subsynchronous control interaction, SSCI) and SSTI (subsynchronous torsional interaction, SSTI). Theoretically, except that the permanent magnet synchronous generator set has no shafting system, the SSTI phenomenon can be completely ruled out. Due to the structure of the wind turbine shafting system, the natural torsional vibration frequency of the shafting system is low, which makes the series compensation of the line that causes subsynchronous oscillation biased. High, up to more than 70%, it is unlikely to have such a high degree of series compensation in the actual circuit, so the SSTI phenomenon is generally not a research focus. The IGE phenomenon is that when the equivalent impedance value of the system is negative at a certain frequency, it will cause the continuous divergence or even increase of the line cu...

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Abstract

The invention provides a secondary synchronous oscillation evaluation method and system based on a wind energy HVDC outward delivery system; the method comprises the steps of establishing a power system model based on pre-established generator set model, wind power plant model and HVDC line model; and calculating the secondary synchronous oscillation risk of the electric power system based on thepower system model. According to the method, the secondary synchronous oscillation of the HVDC system by the wind power plant is added, so that the application range of the original standard is expanded, and the actual situation of the current power grid is better met; and whether a complex power system suffers from secondary synchronous oscillation or not can be primarily evaluated in a conditionthat HVDC conveys a large scale of wind power, so that the influence of the large wind power base and the HVDC on the power system can be effectively analyzed, the possibility of secondary synchronous oscillation of the system can be evaluated more accurately, and important significance on the safe and stable operation of an actual power system can be played.

Description

technical field [0001] The invention belongs to the technical field of power system planning and operation, and in particular relates to a subsynchronous oscillation evaluation method and system based on a wind energy HVDC external transmission system. Background technique [0002] With the rapid development of wind power in the past ten years, it has gradually shown the characteristics of base and scale, and the problem of reverse distribution of load is more serious. Since wind power resources are concentrated in economically underdeveloped regions, the wind energy produced cannot be fully consumed in the region and can only be sent to economically developed regions. The contradiction of wind power transmission is relatively prominent. High-voltage direct current transmission (HVDC) technology is favored because of its ability to transmit large-capacity electric energy over long distances with low loss. However, large-capacity, long-distance energy transmission brings a se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/24H02J3/36
CPCH02J3/00H02J3/24H02J3/36H02J2003/365H02J2203/20Y02E60/60
Inventor 张小瑜迟永宁李琰蒋维勇汤海雁魏春霞王志冰刘超张占奎田新首魏林君王真王峤
Owner CHINA ELECTRIC POWER RES INST
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