A power system dynamic safety assessment method based on a risk index
A power system and risk index technology, applied in complex mathematical operations, data processing applications, instruments, etc., can solve the problems of combining safety and economic indicators to consider system safety conditions, reducing modeling and simulation calculations, and facilitating The effect of regulating and increasing speed
Active Publication Date: 2019-04-02
CHINA THREE GORGES UNIV
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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
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[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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A power system dynamic safety assessment method based on risk indexes comprises the steps of establishing a risk model based on the probability of occurrence of anticipated accidents and the influenceafter occurrence of the anticipated accidents, and screening and sorting the anticipated accidents to obtain a dominant anticipated accident set; carrying out load flow analysis and calculation on the screened dominant anticipated accidents and recording voltage V and voltage phase angles of all nodes in the system; based on the transient stability margin in the polynomial form and the obtained power flow data, calculating probability distribution of the transient stability margin and a mean value and a standard deviation of the transient stability margin; based on the established risk model,calculating a risk index of the anticipated accident by utilizing the probability distribution of the transient stability margin and a severity function; and taking corresponding prevention control and emergency control measures based on the solved risk index. According to the method, the uncertainty of load prediction is considered, two factors for determining the system safety, namely the accident probability and severity, are quantitatively combined, the influence of an accident on the whole power system can be comprehensively reflected, and therefore the relation between the operation safety and economy of the power system can be better coordinated.
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...
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Login to View More 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