Voltage fluctuation simulating method

A technology of voltage disturbance and simulation method, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., to achieve the effects of simple operation, improved accuracy, and good real-time performance

Inactive Publication Date: 2016-04-20
STATE GRID ANHUI ELECTRIC POWER +2
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Problems solved by technology

[0003] Many devices currently on the market only have the ability to simulate partial voltage faults, such as stepped voltage swells, voltage sags, etc.

Method used

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Embodiment Construction

[0023] refer to figure 1 , a kind of voltage disturbance simulation method that the present invention proposes, comprises the following steps:

[0024] S1. A preset fault simulation command, the fault simulation command includes fault voltage disturbance characteristic value, voltage disturbance duration and voltage disturbance type. The types of voltage disturbances include three-phase symmetrical voltage disturbances caused by three-phase short-circuit faults, asymmetric voltage disturbances caused by single-phase-to-ground short-circuit faults, asymmetric voltage disturbances caused by two-phase-to-phase short-circuit faults, and asymmetric voltage disturbances caused by two-phase-to-ground short-circuit Symmetrical voltage dips. The characteristic value of fault voltage disturbance includes disturbance depth and start and stop phase.

[0025] S2. Generate an original model of voltage disturbance according to the fault simulation instruction. Specifically, the abc-dq0 co...

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Abstract

The invention discloses a voltage fluctuation simulating method which comprises the following steps of S1, presetting a fault simulating instruction which comprises a fault voltage disturbance characteristic value, a voltage fluctuation duration time and a voltage fluctuation type; S2, generating a voltage fluctuation original model according to the fault simulating instruction; S3, sampling the voltage of a to-be-tested power grid, and determining the current voltage state of the to-be-tested power grid; S4, adjusting the voltage fluctuation original model according to the current voltage state of the to-be-tested power grid, and generating a voltage fluctuation object model; and S5, converting the voltage fluctuation object model to a voltage fluctuation signal, and generating a fluctuation voltage in the to-be-tested power grid according to the voltage fluctuation signal. The voltage fluctuation simulating method can be used for testing the operation state of each system device in voltage fluctuation and taking measures for preventing accidents in advance.

Description

technical field [0001] The invention relates to the technical field of power grid testing, in particular to a voltage disturbance simulation method. Background technique [0002] According to statistics, more than 90% of power quality problems are caused by voltage sags (VoltageSag) and voltage swells (VoltageSwell), among which voltage sags are the main cause of accidents. The more harmful voltage sag is mainly caused by the short-circuit fault of the system, which has a long propagation distance and a large drop amplitude. When three-phase short-circuit faults, two-phase short-circuit faults and single-phase ground short-circuit faults occur in the power system, short-term voltage disturbances (surges or dips) seriously affect computers, AC contactors, programmable logic controllers (PLCs), The safe operation of typical sensitive equipment such as frequency conversion speed control devices, the failure of these sensitive loads will bring huge direct economic losses to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 汤伟刘路登殷骏李刚
Owner STATE GRID ANHUI ELECTRIC POWER
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