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A frequency stability early warning method based on grid sensing data

A technology of frequency stability and sensing data, applied to electrical components, circuit devices, AC network circuits, etc., can solve problems such as system frequency stability and early warning that cannot be advanced, and achieve the effect of reducing the risk of frequency instability

Active Publication Date: 2022-04-15
STATE GRID CORP OF CHINA +2
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Problems solved by technology

Prediction of Power System Frequency Curve after Disturbance Based on Deep Belief Network (Proceedings of the Chinese Society for Electrical Engineering, 2019, 39(17): 5095-5104)" proposed a method for predicting the frequency curve of power system after disturbance. These methods are mainly used in large The emergency judgment of the system frequency change trend and frequency stability under the disturbance provides a basis for the system frequency control, and it is impossible to pre-warn the system frequency stability in advance, providing sufficient time margin for system troubleshooting and operation mode adjustment

Method used

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  • A frequency stability early warning method based on grid sensing data
  • A frequency stability early warning method based on grid sensing data
  • A frequency stability early warning method based on grid sensing data

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Embodiment 1

[0050] see figure 1 , a frequency stability early warning method based on power grid sensing data. This method is aimed at a power grid with a capacity of more than 5 million kilowatts, and the following steps are followed in turn:

[0051] 1. First determine the threshold value of the frequency deviation of ±0.1Hz based on the capacity of the power grid, and then count the number of times the frequency deviation of the power grid exceeded ±0.1Hz per day in the previous year. See Table 1 for the results:

[0052] Table 1 The number of frequency deviation limit violations occurred every day in a power grid in the previous year

[0053]

[0054]

[0055] 2. Use the following formula to calculate the probability of occurrence of different frequency deviation violation times:

[0056]

[0057] In the above formula, f(x) is the probability of occurrence of x times of frequency deviation exceeding the limit, D(x) is the number of days of x frequency deviation exceeding the l...

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Abstract

A frequency stability early warning method based on power grid sensing data. This method first counts the number of frequency deviations that have exceeded the limit every day in the power grid in the previous year, and then performs the probability distribution function fitting of the number of frequency deviations that exceed the limit according to the statistical data, and according to The probability distribution function obtained by fitting is used to obtain the confidence range of the number of frequency deviation violations, and then observe the number of frequency deviation violations of the current power grid in units of days. If the number of frequency deviation violations for two consecutive days exceeds the maximum value of the confidence range, Then it is determined that there is a risk of frequency instability in the power grid, and it is necessary to monitor the frequency regulation characteristics of the units in the power grid. This design realizes the early warning of the frequency stability of the system before a large disturbance occurs, which is conducive to reducing the risk of frequency instability of the system.

Description

technical field [0001] The invention belongs to the field of power system safety and stability analysis, and in particular relates to a frequency stability early warning method based on grid sensing data. Background technique [0002] With the rapid development of new energy, it deteriorates the frequency characteristics of the power system from two aspects. On the one hand, the output of new energy is mainly determined by the wind and rain conditions, and its output has strong randomness and volatility. Large-scale new energy grid integration increases the difficulty of system active power balance. On the other hand, the active power adjustment ability of new energy units is relatively poor, and the response ability to frequency fluctuations in the system is insufficient, which further deteriorates the frequency adjustment ability of the system. Therefore, when the new energy penetration rate in the system is too high, the risk of system frequency instability increases. I...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24
CPCH02J3/241H02J2203/20
Inventor 刘巨赵红生杜治王博杨东俊艾小猛
Owner STATE GRID CORP OF CHINA
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