WAMS-based ultra-low-frequency oscillation monitoring and emergency control method therefor

An emergency control, ultra-low frequency technology, applied in the direction of reducing/preventing power oscillation, reducing the flicker of the AC network, and laying out the AC circuit for emergency treatment. It can solve the problems of difficult frequency recovery and reduced system frequency modulation performance.

Active Publication Date: 2018-04-03
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +1
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Problems solved by technology

Several accidents that have occurred have shown that the primary frequency modulation of hydroelectric units usually provides negative damping during the ultra-low frequency oscillation process. Exiting primary frequency modulation of hydroelectric units can increase the system damping level, which can be used as an emergency control strategy. Significantly reduced performance, when the system is disturbed by power imbalance, the frequency is difficult to recover

Method used

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  • WAMS-based ultra-low-frequency oscillation monitoring and emergency control method therefor
  • WAMS-based ultra-low-frequency oscillation monitoring and emergency control method therefor
  • WAMS-based ultra-low-frequency oscillation monitoring and emergency control method therefor

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Embodiment 1

[0049] Such as Figure 1~3 Shown, the present invention is based on the ultra-low frequency oscillation monitoring method of WAMS, comprises the following steps:

[0050] A: Collect prime mover information and parameter information of the whole network hydroelectric unit to form a hydroelectric unit parameter library M:

[0051] M=[M 1 , M 2 ,...,M n ] (1)

[0052] In the formula, m i Indicates the parameter set of the i-th hydroelectric unit, S i (MVA) is the unit capacity, is the time constant of water hammer effect; G i Indicates whether the governor of the i-th hydroelectric unit has an isolated grid mode, G i = 0 means no, G i =1 means yes;

[0053] B: Build the simulation model of the power system under study, and form four typical operation modes: Fengda, Fengping, Fengxiao, and Fengjixiao according to the load level of the wet season;

[0054] C: According to the hydroelectric unit parameter library M in step A, determine the ordering of hydroelectric uni...

Embodiment 2

[0072] Such as Figure 1~4 As shown, on the basis of embodiment 1, the emergency control method of ultra-low frequency oscillation based on WAMS comprises the following steps:

[0073] F: When the occurrence of ultra-low frequency oscillation is detected, judge whether to start the emergency control strategy of ultra-low frequency oscillation;

[0074] G: After the ultra-low frequency oscillation emergency control strategy is started, the damping characteristics of the governor are evaluated online according to the ordering of the hydroelectric units described in step C. If the hydroelectric units provide negative damping, go to step H; if the hydroelectric units provide positive damping, Evaluate the damping characteristics of the next hydroelectric unit according to the sequence of hydroelectric units;

[0075] H: According to the hydroelectric unit parameter library M in step A, suppress ultra-low frequency oscillation;

[0076] I: Select the next unit according to the so...

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Abstract

The invention discloses a WAMS-based ultra-low-frequency oscillation monitoring and emergency control method therefor. A WAMS-based ultra-low-frequency oscillation online monitoring method and a modelfor judging whether ultra-low-frequency oscillation occurs or not are given; by performing online judgment on whether a hydroelectric generating set provides negative damping or not, a speed regulator is further controlled in a targeted manner; and by combination with switching of speed regulator networking/isolated network mode, ultra-low-frequency oscillation can be quite down while certain primary frequency modulation capacity is maintained, so that a practical emergency control measure is provided for ultra-low-frequency oscillation control by a power grid dispatching operation staff, andtherefore, the control method is of significant practical meaning to power grid dispatching operation.

Description

technical field [0001] The invention relates to the technical field of power system safety and stability control, in particular to WAMS-based ultra-low frequency oscillation monitoring and its emergency control method. Background technique [0002] In recent years, ultra-low oscillations of less than 0.1 Hz have successively appeared in the isolated island system of hydropower transmission or the power system with a high proportion of hydropower, which has caused periodic and frequent actions of the speed control system, and large-scale low-frequency oscillations in system frequency and power, which seriously Threats to the safe and stable operation of the power grid. [0003] Under the background of national power grid interconnection, thermal power accounts for a high proportion of regional interconnected grids, and there is no ultra-low frequency oscillation phenomenon. Both academia and industry lack the research basis for ultra-low frequency oscillation mechanism and co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/001H02J3/002H02J3/24H02J2203/20
Inventor 陈刚常晓青史华勃刘畅王曦周波张华王亮
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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