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Critical clearing time method for power system disturbance based on frequency synchronization theory of second-order inhomogeneous Kuramoto model

A power system and cut-off time technology, which is applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as the study of the attractive domain of the system equilibrium point, the inability to correspond to the power system model, and the inability to apply transient stability analysis. , to achieve the effect of accurate and reliable calculation results and fast calculation speed

Inactive Publication Date: 2015-02-04
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0006] The present invention is to solve the problem that the existing method is to analyze the model after linearization, and the first-order model does not contain the rotational inertia item, so it cannot correspond well to the power system model; the existing method has no degree of attraction domain for the system equilibrium point Carrying out research, it cannot be applied to the problem of transient stability analysis, but provides a power system disturbance limit cut-off time method based on the frequency synchronization theory of the second-order non-uniform Kuramoto model

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  • Critical clearing time method for power system disturbance based on frequency synchronization theory of second-order inhomogeneous Kuramoto model
  • Critical clearing time method for power system disturbance based on frequency synchronization theory of second-order inhomogeneous Kuramoto model
  • Critical clearing time method for power system disturbance based on frequency synchronization theory of second-order inhomogeneous Kuramoto model

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specific Embodiment approach 1

[0020] Specific embodiment one: the power system disturbance limit cut-off time method based on the second-order non-uniform Kuramoto model frequency synchronization theory of the present embodiment, it is realized according to the following steps:

[0021] Step 1: Establish a second-order non-uniform Kuramoto model corresponding to the power system model, and calculate the power output and transmission power of the power system, simplify the grid network to a fully connected grid network that only includes internal nodes of the generator, and form a second-order non-uniform The correspondence between the natural frequency term in the uniform Kuramoto model and the coupling coefficient of the network and the power output and transmission power in the power system;

[0022] Step 2: If a node in the power system is disturbed, modify the parameters of the second-order non-uniform Kuramoto model according to the structure of the grid network after the disturbance is removed;

[00...

specific Embodiment approach 2

[0029] Specific implementation mode two: the difference between this implementation mode and specific implementation mode one is that the step one is specifically:

[0030] Step 11: Establish a second-order non-uniform Kuramoto model corresponding to the power system model, and convert the original data of the analysis system to a unified benchmark value:

[0031] First, for a power system with n generators, in the case of disturbance, the equation of each generator can be written as

[0032] M i d 2 δ i dt 2 + D i d δ i dt = P mi - P ei , ...

specific Embodiment approach 3

[0056] Specific implementation mode three: the difference between this implementation mode and specific implementation mode one or two is that: in the step two, it is specifically:

[0057] Step 21: First, use the Kron reduction method to shrink the grid network to a fully connected network that only includes nodes in the generator. If a node in the system is disturbed, set the initial disturbance removal time t c = 0.001s;

[0058] Step 22: According to the structure of the power grid network after the disturbance removal, modify the admittance array of the augmented network to form the admittance array of the augmented network after the disturbance removal, and perform an equivalent value on the admittance array of the augmented network after the disturbance removal ;

[0059] Step two and three: For a power system with n generators, δ(t)=(δ 1 (t),...,δ n (t)), ω(t)=(ω 1 (t),...,ω n (t)) respectively represent the set of rotor angle and angular velocity of each generato...

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Abstract

The invention discloses a critical clearing time method for power system disturbance based on a frequency synchronization theory of a second-order inhomogeneous Kuramoto model, relates to a critical clearing time method for a power system after disturbance, and aims at solving the problems that an existing method cannot well correspond to a power system model, and an attraction domain degree of a system balance point is not researched in the existing method and cannot be applied to transient stability analysis. The method comprises the following steps: 1 building a second-order inhomogeneous Kuramoto model corresponding to the power system model; 2 modifying parameters of the second-order inhomogeneous Kuramoto model; 3 solving a state variable of the system at the disturbance clearance moment, and solving parameters C (delta0, omega0 and alpha) in a criterion according to the state variable; 4 judging whether the system can be kept in synchronism stability after certain disturbance according to the parameters in a synchronization criterion, and calculating the critical clearing time that the system can be kept unstable after the system is disturbed. The critical clearing time method is applied to the field of electric power system.

Description

technical field [0001] The invention relates to a method for limiting cut-off time after a power system is disturbed. Background technique [0002] Since the 1920s, scholars in the field of power systems have recognized the power system stability problem and studied it as an important aspect to ensure the safe operation of the system. System instability accidents not only cause huge economic losses and social impacts, but also reflect the importance and necessity of studying power system stability issues. With the continuous interconnection of power systems and the rise of smart grids, the scale of power grids has become larger and more complex; and with the development of new energy power generation technologies, more and more distributed When distributed energy is connected to the power system, due to the randomness and volatility of distributed energy, the power grid will suffer more and more disturbances. Therefore, the transient stability problem of the power system w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCY02E60/00
Inventor 郭钰锋庞爱平杨柳万杰李祝春于达仁薛小平
Owner HARBIN INST OF TECH
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