Bus transient voltage stability assessment method and system, medium and computing equipment
A transient voltage stability and transient voltage technology, applied in the field of bus transient voltage stability evaluation, can solve the problems of not adapting to the development of the power grid, not applicable to emergency control, etc., to prevent further expansion of accidents, improve reliability and operation Stability, effect of reducing load loss
Pending Publication Date: 2021-09-03
NANJING NARI GROUP CORP
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Problems solved by technology
In addition, using the existing methods to evaluate transient voltage instability often needs to investigate the voltage response within 10s after the fault starts. For the actual power grid, this method is only suitable for offline calculation and analysis, not for emergency control
[0004] Therefore, the traditional bus transient voltage stability assessment is no longer suitable for the development of the power grid, and a new bus transient voltage stability assessment method is urgently needed
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[0052] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0053] The bus transient voltage stability evaluation method includes the following steps:
[0054] Step 1. During the period of power angle oscillation in the two regions, the busbar of the hub substation connected to the busbars in the two regions is regarded as a voltage source whose electromotive force amplitude changes with the power angle oscillation, and the transient voltage stability margin of the distribution network busbar is calculated at each sampling time ; Among them, the busbar of the distribution network is connected to the busbar of the hub substation;
[0055] Step 2, if T 1 to T 2 During this period, all the transient voltage stability margins of the distribution network b...
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The invention discloses a bus transient voltage stability evaluation method and system, a medium and computing equipment, and the method comprises the steps: taking a hub substation bus connected with buses in two regions as a voltage source of which the electromotive force amplitude changes along with the power angle oscillation during the power angle oscillation of the two regions; and calculating the transient voltage stability margin of the distribution network bus at each sampling moment, judging whether the transient voltage of the bus is unstable or not according to the positive and negative change conditions of the transient voltage stability margin of the distribution network bus in the power angle oscillation period, and recognizing the bus with transient voltage instability caused by power angle oscillation in time by tracking the operation state of a power grid in real time, so that the evaluation result can provide an auxiliary decision for emergency control, so that a targeted load shedding measure can be taken for a bus with transient voltage instability, accidents can be prevented from being further expanded, the load loss can be reduced to the maximum extent, and the improvement of the power supply reliability and the operation stability of a power grid is facilitated.
Description
technical field [0001] The invention relates to a busbar transient voltage stability evaluation method, system, medium and computing equipment, and belongs to the technical field of power systems and automation thereof. Background technique [0002] Faults or disturbances can cause power angle oscillations between interconnected two-region grids. In the process of power angle oscillation, the voltage at each point of the connecting line between the two areas will also fluctuate accordingly. The voltage amplitude at the same point on the tie line decreases with the increase of the power angle swing. In actual operation, when the system fails or is disturbed, the power angle oscillation of the two interconnected areas often occurs but no out-of-step occurs. However, the problem of transient voltage instability occurs on the load bus connected to the tie line between the two areas. Since the power angle oscillation quickly returns to stability after a few cycles, the transien...
Claims
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Login to View More IPC IPC(8): G01R19/165
CPCG01R19/16538
Inventor 李宣方勇杰李兆伟吴雪莲侯玉强徐广刘福锁
Owner NANJING NARI GROUP CORP