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A method for judging subsynchronous oscillation induced by a direct drive fan

A sub-synchronous oscillation and wind turbine technology, applied in wind power generation, reducing/preventing power oscillation, AC network circuits, etc., to achieve the effect of avoiding the risk of sub-synchronous oscillation

Inactive Publication Date: 2018-12-28
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Since direct-drive wind turbines use power electronic inverters as grid-connected interfaces, their harmonic wave response characteristics under the action of the control system are significantly different from those of traditional thermal power units. However, there is currently a lack of convenient and effective subsynchronous oscillation for direct-drive wind turbine grid-connected systems Judgment method of the problem

Method used

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  • A method for judging subsynchronous oscillation induced by a direct drive fan
  • A method for judging subsynchronous oscillation induced by a direct drive fan
  • A method for judging subsynchronous oscillation induced by a direct drive fan

Examples

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Embodiment 1

[0097] The following takes a wind power plant as an example to simulate the present invention. The wind power plant is composed of 30 direct-drive fans with a rated power of 1.5MW, located at the end of the power grid, and the local load rate is low and can be ignored.

[0098] 1. Dynamic equivalent modeling of direct-drive fan grid connection;

[0099] The wind farm as a whole can be equivalent to a single wind turbine with a rated capacity of Sb=1.5*30MVA, and its reference voltage U t =575V, DC voltage reference value U dc ref=1175V, L g =0.8mH, L=1mH, C=1mF, K PP =3120,K Pi =10,K ii =40.

[0100] 2. Obtain the subsynchronous oscillation frequency f of the system according to the criterion W os ;

[0101] attached Figure 7 In order to use the above parameters to form the criterion W versus frequency curve, from Figure 7 It can be seen that at the frequency of 29.6Hz and 70.4Hz, the criterion W takes a positive value, and the subsynchronous oscillation frequency ...

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Abstract

The invention discloses a method for judging subsynchronous oscillation induced by a direct drive fan, belonging to the technical field of power system security and stability. By acquiring the parameters of the electric network and the control system of the direct-drive fan, based on the structure of direct-drive fan control system, a real-time small-signal model is established, the response process of the control system to input harmonics is analyzed, the analytical expression of output harmonics is obtained, and the criterion for judging the stability of the system is obtained according to the phase relationship between harmonics in the expression. The dangerous frequency of subsynchronous oscillation can be obtained by analyzing the calculated criterion value in the subsynchronous frequency range. The stability of the system under a certain controller parameter can be predicted by using criterion W, which provides auxiliary information for decision-making and avoids the risk of subsynchronous oscillation.

Description

technical field [0001] The invention belongs to the technical field of power system safety and stability, and in particular relates to a method for judging subsynchronous oscillation caused by a direct drive fan. Background technique [0002] Power system subsynchronous oscillation is a power interaction behavior caused by the coupling of dynamic characteristics of various equipment in the system. The oscillation frequency of subsynchronous oscillation is generally between 8 and 50 Hz for a power system with a power frequency of 50 Hz. In recent years, with the substantial increase in installed capacity of wind power worldwide, the dynamic stability of the power system caused by it has become very prominent. Subsynchronous oscillation problems caused by direct-drive permanent magnet synchronous fans have appeared many times in the Northwest Power Grid of my country, which has seriously affected the The safe and stable operation of the power system also restricts the export of...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/24H02J3/386H02J2203/20Y02E10/76
Inventor 徐衍会曹宇平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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