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Method and system for evaluating effect of power system emergency control strategy

An emergency control and power system technology, applied in electrical components, circuit devices, AC network circuits, etc., to solve problems such as the inability of emergency control strategies to achieve expected results and trajectory deviations

Active Publication Date: 2018-10-12
CHINA ELECTRIC POWER RES INST
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Problems solved by technology

[0007] In order to solve the existing off-line and online emergency control strategy formulation and implementation process in the background technology, the trajectory between the simulated trajectory in the expected fault scenario and the actual multi-machine disturbed trajectory caused by the existence of model deviation and scenario deviation Deviations lead to the technical problem that the emergency control strategy cannot achieve the expected effect. The present invention provides a method for evaluating the effect of the emergency control strategy of the power system. The method includes:

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  • Method and system for evaluating effect of power system emergency control strategy
  • Method and system for evaluating effect of power system emergency control strategy
  • Method and system for evaluating effect of power system emergency control strategy

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Embodiment 1

[0085] figure 1 is a flowchart of a method for evaluating the effect of an emergency control strategy for a power system according to a preferred embodiment of the present invention. Such as figure 1 As shown, the method 100 for evaluating the effect of an emergency control strategy for a power system according to the present invention starts from step 101 .

[0086] In step 101, calculate the simulated equivalent power angle trajectory P when the emergency control strategy is adopted in the expected fault scenario fz (δ eq ), expected transient kinetic energy V fz trajectory and expected transient stability margin S xn , to form a fault emergency control strategy table, in which the simulated equivalent power angle trajectory P fz (δ eq ) is the curve formed by the complementary group inertia center-relative motion transformation, δ eq is the simulated equivalent power angle under the expected fault.

[0087] Preferably, the simulated equivalent power angle trajectory...

Embodiment 2

[0156] Figure 4 It is a grid structure diagram of a standard calculation example adopted by the method for evaluating the effect of an emergency control strategy of a power system in another preferred embodiment of the present invention. Such as Figure 4 As shown, this preferred embodiment adopts the IEEE39 node system standard calculation example. Assume that the expected fault scenario is: a permanent three-phase short-circuit fault occurs on line 16-17, and the fault is cleared by cutting off the line in 0.4s. The emergency control strategy formulated for this fault scenario is: cut off the active power of generator G_33 at 30 cycles to 400MW.

[0157] Assuming that the actual duration of the fault is 23 cycles, the evaluation process of the above-mentioned emergency control strategy prevention and control effect by the method of the present invention is as follows:

[0158] In step 1, the power angle trajectory of the multi-machine system under the expected fault scen...

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Abstract

The invention provides a method and system for evaluating the effect of a power system emergency control strategy. The method comprises: invoking a fault emergency control strategy table according tothe fault scenario information when the power system fails, and determining an online matching emergency control strategy, a simulation equivalent power angle trajectory Pfz (Deltafz), an expected transient kinetic energy Vfz trajectory and an expected transient stability margin Sxn; obtaining an actual equivalent power angle Deltasj, an actual equivalent rotational speed deviation Omegasj and transient deviation energy Vpc(Deltasj) according to the actual power angle and the rotational speed deviation of a generator at the current time of the power system; determining the effect of the emergency control strategy according to the value of Vpc(Deltasj) and comparing the absolute value of the Vpc(Deltasj) and Sxn; and determining the operating status of the power system, and determining whether to end the evaluation according to the effect of the emergency control strategy and the operating status of the system. The method and system can evaluate the prevention and control effect of theemergency control strategy of the power system in real time, and find the fault scene with invalid strategy as early as possible, which provides valuable decision time for adopting additional controlor active de-allocation.

Description

technical field [0001] The present invention relates to the field of power control, and more particularly, to a method and system for evaluating the effectiveness of emergency control strategies for power systems. Background technique [0002] In recent years, with the continuous expansion of the scale of the power system and the access of a large number of new equipment, the characteristics of the power grid have become more complex, and its safe and stable operation is facing more severe challenges. Since power grid faults are unavoidable, efficient and reliable power system emergency control is an important guarantee for the safe and stable operation of the power grid. However, the long-term operation practice of the power system shows that no matter how perfect the emergency control strategy is, it is always possible that the emergency control strategy implemented cannot achieve the expected effect due to the superposition of some unpredictable accidental factors. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G06Q50/06
CPCG06Q50/06H02J3/00H02J3/001
Inventor 陈长胜马世英郑超
Owner CHINA ELECTRIC POWER RES INST
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