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Active and passive frequency response compound control method

A technology of frequency response and composite control, applied in the electric power field, can solve the problems of reducing the overall effect of frequency response and frequency response out of synchronization, and achieve the effect of improving frequency stability and resistance, avoiding frequency oscillation, and avoiding low-frequency load shedding

Active Publication Date: 2018-06-01
STATE GRID LIAONING ECONOMIC TECHN INST +2
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Problems solved by technology

[0003] In order to ensure the operation safety and quality of the entire power grid, the frequency response is set as a cross-regional free mutual support function, which is a necessary transmission auxiliary service for all power generation units. Its control mode is decentralized and autonomous control based on local frequency differences. Although the system The frequency response capability is the synthesis of the frequency response capabilities of all generator sets, but the asynchronous frequency response among the generator sets will reduce the overall effect of the frequency response

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Embodiment Construction

[0051] Aiming at the problems existing in the above-mentioned prior art, the present invention provides an active and passive frequency response composite control method, the purpose of which is to propose a method that can effectively improve the position of the lowest point of the frequency response in the context of UHV, avoid low-frequency load shedding of the system, and At the same time to ensure the stability of the system control strategy.

[0052] For a two-area power grid, the present invention uses a solid straight line to represent inter-area connection lines, a dotted line to represent communication lines, A zone is a disturbance zone, and B zone is a non-disturbance zone, specifically as figure 2 Show. Among them, the two-area control methods under the active and passive frequency response composite control method are as follows:

[0053] 1. Establish the mathematical model of the unit thermal power unit.

[0054] For unit thermal power units, from the perspec...

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Abstract

The invention relates to the field of electric power technology, in particular to an active and passive frequency response compound control method, in particular to a frequency response control methodunder large disturbances. The method of the invention includes the steps of first, establishing a mathematical model of a unit thermal power unit, and second, establishing a mathematical model of aninterconnected power grid. The method of the invention realizes the change of frequency response from decentralized control to centralized control, from feedback control to feedforward control, and from correction control to preventive control, and can improve the overall frequency response capability of the system without increasing frequency response facilities, thereby improving the frequency stability and resistance under large disturbances. The method can also coordinate the global and local control objectives, and can not only avoid the low-frequency load shedding of the system under large disturbances, but also make the system restore stability quickly, thereby avoiding the frequency oscillation in the active control process.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to an active and passive frequency response composite control method, in particular to a frequency response control method under large disturbances. Background technique [0002] The frequency stability of the power system under large disturbances is very important, especially in the context of the gradual formation of the UHV AC-DC hybrid power grid and the large-scale access of new energy sources, the frequency stability situation is extremely severe. The second to minute time scale after the disturbance, that is, the period of the frequency response (primary frequency modulation), is the key stage to determine whether the frequency is stable or not, and has always been concerned by the engineering and academic circles. [0003] In order to ensure the operation safety and quality of the entire power grid, the frequency response is set as a cross-regional free mutual suppor...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/24H02J3/002H02J2203/20
Inventor 穆永强王春生王勇胡大龙白静姜涛王涛梁鹏王春凤王鹤霏李卫东晋萃萃
Owner STATE GRID LIAONING ECONOMIC TECHN INST
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