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A method for decoupling dynamic response of high and low voltage grid voltage

A voltage dynamic response, low-voltage power grid technology, applied in the direction of AC network voltage regulation, circuit devices, harmonic reduction devices, etc., can solve problems that have not been studied in depth, and achieve improved usability, reduced computational complexity, and fast and effective filtering. Effect

Active Publication Date: 2021-04-27
STATE GRID SHANDONG ELECTRIC POWER +1
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Problems solved by technology

[0005] Although there are many examples of synchronous monitoring systems for low-voltage power grids, there has been no in-depth research on the coupling phenomenon and decoupling methods of voltage measurement data in low-voltage power grids.

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  • A method for decoupling dynamic response of high and low voltage grid voltage
  • A method for decoupling dynamic response of high and low voltage grid voltage
  • A method for decoupling dynamic response of high and low voltage grid voltage

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with accompanying drawing:

[0040] A method for decoupling dynamic response of high and low voltage power grid voltage, the flow chart of the method is as follows Figure 5 shown. This method firstly inputs the synchronous measurement data of the high and low voltage sides (the positive sequence voltage and phase angle of the high voltage side and the positive sequence voltage of the low voltage side) after the large disturbance occurs, and then determines the transmission lines, transformers and Electromechanical transient model parameters for the load. Through the program, according to the electromechanical transient equations, taking the measured data of the high voltage side as the input quantity, the large disturbance voltage response of the low voltage side is solved. Write a filter program, take the large disturbance voltage response on the low-voltage side as a reference signal, and use medi...

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Abstract

The invention discloses a high-voltage and low-voltage power grid voltage dynamic response decoupling method, which includes collecting synchronous measurement data after a large disturbance; determining the grid structure of the interconnected power grid and the electromechanical transient state of transmission lines, transformers and loads before the large disturbance occurs The parameters of the model; list the electromechanical transient equations of the interconnected grid, and use Newton's method to solve the equations to obtain the voltage response of the low-voltage side to large disturbances at each moment; use the median filter and mean filter method to filter out the voltage measurement of the low-voltage side Impulse noise and Gaussian white noise in the data; subtract the large disturbance voltage response from the filtered low-voltage side voltage measurement data to obtain the voltage response component of the local disturbance on the low-voltage side, and complete decoupling. The invention decouples the voltage measurement data on the low-voltage side, and the decoupled data can be used for analysis and application scenarios at different levels of the high-voltage and low-voltage power grids, thereby improving the usability of the voltage measurement data on the low-voltage side and the controllability and reliability of the low-voltage power grid. observability.

Description

technical field [0001] The invention relates to the field of power system state monitoring, in particular to a method for decoupling dynamic response of high and low voltage power grid voltages. Background technique [0002] Wide-area measurement systems based on synchrophasor measurement units (PMUs) are widely used around the world, and play an important role in online status monitoring, safety warning, and accident analysis of power grids. In view of the cost and the traditional understanding of grid monitoring, conventional PMUs are mostly installed in high-voltage substations and main power plants to monitor the dynamics of the high-voltage main grid. With the massive access of renewable energy such as wind power and photovoltaics and the rapid increase of electric vehicles, the dynamic behavior of low-voltage power grids is becoming more and more complex. In order to fully grasp the dynamic behavior of the power system and ensure the safe and stable operation of the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/12H02J3/01H02J3/24
CPCH02J3/01H02J3/12H02J3/24H02J2203/20Y02E40/40
Inventor 冯忠奎王辉刘泊辰刘刚于洋徐天锡李亚洲刘广吕东飞王毅韩永冯曰敏崔炎张宁赵文锦张卫东仲刚孟成周宝凤张学绢高原马力远昝浩
Owner STATE GRID SHANDONG ELECTRIC POWER
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