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Novel low-frequency unloading setting method aiming at isolated power grid

A low-frequency load shedding and isolated power grid technology, applied in the field of control, can solve problems such as the impact on the stable operation of the isolated power grid, achieve the effect of improving the reliability of power supply, with obvious effects, and solving the problem of safe and stable operation

Inactive Publication Date: 2013-07-31
国网西藏电力有限公司 +1
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Problems solved by technology

[0004] The invention aims at the problem of the influence of transient frequency changes on the stable operation of the isolated power grid, and proposes a new low-frequency load shedding setting method for the isolated power grid, which improves the safety and stability of the isolated power grid operation

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  • Novel low-frequency unloading setting method aiming at isolated power grid
  • Novel low-frequency unloading setting method aiming at isolated power grid
  • Novel low-frequency unloading setting method aiming at isolated power grid

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Embodiment Construction

[0014] On the basis of studying the frequency characteristic curve of the isolated system, the present invention proposes a new low-frequency load shedding method considering the transient frequency characteristic of the system. The main contents of this method are as follows:

[0015] (1) According to the transient frequency characteristics of the specific isolated power grid and the system's requirements for frequency, the starting value of each round of low-frequency load shedding is considered separately. When calculating the transient maximum frequency deviation, the frequency primary adjustment function of the governor is considered.

[0016] Isolated power grids and interconnected large systems have different control capabilities for system frequency, and have different requirements for frequency control. The transient frequency of some isolated power grids is above 45Hz, and the steady-state frequency is above 48Hz, which means the system is stable. In general, 49Hz ...

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Abstract

The invention relates to a novel low-frequency unloading setting method aiming at an isolated power grid. The method provided by the invention comprises the following steps: singly considering a starting value of each wheel for low-frequency unloading according to the transient frequency characteristics of the isolated power grid and the frequency requirements of a system; selecting the lowest frequency value with stable transient frequency and the lowest frequency value with stable steady frequency; carrying out a once adjustment action of the frequency; determining the time delay of a low-frequency unloading action; adopting a conventional short time delay on an action wheel with a high low-frequency unloading starting value; adopting a long time delay on an action wheel with a high low-frequency unloading starting value according to a transient frequency characteristic curve of the system; and enabling a low-frequency unloading action wheel with the lowest frequency and a wheel with the shortest time delay to firstly act and adopting a parallel relation action among the other action wheels with a high frequency and a long time delay. In the method provided by the invention, thesafe and stable operation problems of the isolated power grid are effectively solved; the power supply reliability of the system is improved; and the method has guidance significances on realizing low-frequency unloading control strategies of some isolated power grids having low-frequency unloading problems in China.

Description

technical field [0001] The invention relates to a control method, in particular to a novel low-frequency load reduction setting method for an isolated power grid. Background technique [0002] The frequency characteristics and stability requirements of the isolated power grid are very different from those of the large power grid, and the security and stability problems of this type of system are more prominent. When formulating the low-frequency load shedding scheme, it is not possible to simply copy DL 428-91 "Technical Regulations for Automatic Low-frequency Load Shedding of Electric Power Systems" for setting. If the method of this regulation is used to calculate the transient maximum frequency deviation, the primary adjustment of the frequency of the governor is not considered. Only considering the frequency change caused by the kinetic energy change of the generating set will make the calculated maximum frequency deviation larger than the actual; this regulation does no...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
Inventor 高应云曹炜麦兴宾沙旦华德吉措姆祁晓卿王琢张菲菲王大宏鲁炜
Owner 国网西藏电力有限公司
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