Time-based initial-stage power grid cascading failure analog simulation method
A technology of cascading faults and simulation, applied to electrical components, circuit devices, AC network circuits, etc., can solve the problems that continuous changes in the power system cannot be effectively monitored and controlled, and cannot meet the requirements of power system operation reliability.
Inactive Publication Date: 2017-01-25
YANTAI POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER +1
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Problems solved by technology
The existing static security analysis of the traditional power system uses the operating state of the system at a specific time section. This type of method cannot effectively monitor and control the continuous changes of various elements of the power system on the time axis, and cannot meet the requirements of modern social and political conditions. Requirements for Power System Operational Reliability under Economic Conditions
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Embodiment
[0066] Embodiment: a kind of time-based initial power grid cascading failure simulation method, it comprises the steps:
[0067] 1. When modeling grid faults, consider cascading faults rather than the impact of a single fault on the system. It is considered that the state of the system before the failure is stable, and the power flow distribution before the failure of the system is known. The period T during which the mth fault occurs and the m+1th fault has not occurred is taken as the research object.
[0068] When the mth fault occurs, considering that the load transferred by the faulty line may cause overloading of the line connected in parallel with the faulty tie line or with the faulty bus section, the flow of overload will cause the line to heat up, and the thermal effect will cause arc sag to cause the line impedance to change. Large, as time increases, the possibility of m+1 cascading failures will increase accordingly. Similarly, if the load continues to increase ...
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The invention discloses a time-based initial-stage power grid cascading failure analog simulation method. The method comprises the following steps: representing influences on a circuit, caused by a heat effect of circuit overload, by utilizing a formula; analyzing parameters of the circuit respectively; when modeling power grid failures, considering influences of cascading failures instead of single failures on a system; providing a power grid failure overload serious degree index; considering influences on a system, caused by changes of a load curve along time; and recalculating the trend of a network, and forming a load index by utilizing a calculating result and judging whether the circuit has the mth failures or not due to passage of time, so as to realize load overload monitoring in a power grid failure process. According to the time-based initial-stage power grid cascading failure analog simulation method, a power grid structure is optimized for power grid planning designers and helps are provided for improving the power grid disaster-resisting capability; and a power grid failure initial-stage evolution can be more comprehensively, more accurately and more detailedly described, and reference is provided for the power grid planning designers and researchers.
Description
[0001] Technical field: [0002] The invention relates to a time-based initial grid cascading failure simulation method, which belongs to the technical field of power system operation safety analysis. [0003] Background technique: [0004] With the development of the economy and society, the demand for electricity in all walks of life is increasing. In order to solve the problem of power supply, the construction of a modern power system featuring ultra-high voltage, long-distance power transmission, and large-capacity units has become an inevitable trend; at the same time, my country Affected by the special geographical environment, various disastrous weathers occur frequently, and the intensity and frequency of some natural disasters have exceeded the capacity of the power system design in those years, making the operation of the power system closer and closer to the limit level, and its safety issues been severely tested. [0005] Study and simulate the performance of the pow...
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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 廉伟杨毅吴雷平康凯宋峰张明耀徐桢刘杰陈陶刘亭亭张婷婷曹检德吕卫民田书然刘俊旭
Owner YANTAI POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER