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A dynamic security assessment method of power system based on risk index

A power system and risk index technology, applied in data processing applications, complex mathematical operations, instruments, etc., can solve problems such as combining safety and economic indicators to consider system safety conditions, reducing modeling and simulation calculations, improving Speed, easy to control effect

Active Publication Date: 2021-04-13
CHINA THREE GORGES UNIV
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  • Description
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Problems solved by technology

The probabilistic method only considers the randomness and uncertainty of the accident, and does not take the consequences of the accident into account, nor can it combine the safety and economic indicators of the system to consider the safety status of the system

Method used

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  • A dynamic security assessment method of power system based on risk index
  • A dynamic security assessment method of power system based on risk index
  • A dynamic security assessment method of power system based on risk index

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Experimental program
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Embodiment

[0076] figure 2 The shown IEEE-39 node system is a test system for the simulation of the present invention to strictly verify its validity, and compares it with the simulation result of the Monte Carlo method. The present invention has assumed that the predicted mean and standard deviation of the load of each node are normally distributed.

[0077] image 3 and Figure 4 Respectively expressed are the error rates of the mean value and standard deviation of the transient stability margin obtained by the linearization method of the present invention compared with the Monte Carlo method in the case of predicting accidents 1 and 2 and different load standard deviations. It can be seen that when the load standard deviation is very small, the error of using the method of the present invention and the Monte Carlo method is very small, which can be regarded as an effective method. When the standard deviation increases, the error also increases, and this error increases. The reason...

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Abstract

A risk index-based dynamic safety assessment method for power systems, including establishing a risk model based on the probability of the expected accident and the impact of the expected accident, screening and sorting the expected accidents, and obtaining the dominant expected accident set; Carry out load flow analysis calculation and record the voltage of all nodes in the system for the leading anticipated accident V and voltage phase angle δ ; Based on the polynomial form of the transient stability margin and the obtained power flow data, calculate the probability distribution of the transient stability margin and its mean and standard deviation; based on the established risk model, use the probability distribution of the transient stability margin and The severity function calculates the risk index of the expected accident; based on the risk index sought, the corresponding preventive control and emergency control measures are taken. The method of the present invention considers the uncertainty of load prediction, quantitatively combines the probability and severity of accidents, which are two factors that determine system safety, and can comprehensively reflect the impact of accidents on the entire power system, thereby better coordinating The relationship between the safety and economy of power system operation.

Description

technical field [0001] The invention relates to the field of dynamic security assessment of electric power systems, in particular to a risk index-based dynamic security assessment method for electric power systems. Background technique [0002] With the development of society, the scale and complexity of power demand and grid scale are increasing day by day. Affected by various uncertain factors, the changes in the operating conditions of the power system are becoming more and more complicated. However, the operators of the system may not be able to accurately grasp the state of the system, resulting in the inability to make corresponding decisions and measures when the accident occurs, and the accident spreads to the large-scale power grid. Relevant studies have shown that many blackouts are caused by transient instability. Therefore, it is very necessary to study effective dynamic security assessment methods. The dynamic safety assessment of power system is also called p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/06G06Q50/06G06F17/16
CPCG06F17/16G06Q10/0635G06Q50/06
Inventor 刘颂凯刘礼煌毛丹李欣郭攀锋杨楠王灿杨苗
Owner CHINA THREE GORGES UNIV
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