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Method for solving the local boundary of cut-set voltage stability regions on the basis of perturbation

A voltage stability domain, cut set technology, applied in the field of power systems, can solve problems such as errors

Inactive Publication Date: 2011-04-20
TIANJIN UNIV
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Problems solved by technology

The accuracy of the hyperplane obtained by this method depends on the number of limit points. The more limit points, the higher the accuracy. Therefore, in order to obtain a higher boundary fitting accuracy, a large number of calculations are required; in addition, when the curvature of the CVSR boundary is large, This method only uses a hyperplane to approximate the boundary, which may cause large errors

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  • Method for solving the local boundary of cut-set voltage stability regions on the basis of perturbation
  • Method for solving the local boundary of cut-set voltage stability regions on the basis of perturbation
  • Method for solving the local boundary of cut-set voltage stability regions on the basis of perturbation

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Embodiment Construction

[0023] The present invention is described in further detail below.

[0024] 1. Cutset voltage stability region (CVSR) and its boundary properties

[0025] A cut set of a power system is defined as a set consisting of the following branches, which divide the system into two disconnected parts:

[0026] I tf ={B 1 , B 2 ,...,B N} (1)

[0027] Among them, B i ={F i ,T i} is the i-th branch of the cut set, F i ,T i are the starting and ending nodes of the branch respectively; N is the number of branches forming the cut set. with PItf Represents the power space of a cut set:

[0028] P Itf =[P I，1 , P I，2 ,...,P I，N ] (2)

[0029] where P I，i is the active power of the i-th branch. with S GL = S G ∪S L Indicates the system injected power vector; S G =P G ∪Q G , S L =P L ∪Q L represent generator and load injection power vectors, respectively. When S GL After given, the operating state x of the system can be uniquely determined by the power flow equa...

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Abstract

The invention belongs to the technical field of power systems and relates to a method for solving the local boundary of cut-set voltage stability regions on the basis of perturbation. The method comprises the following steps: firstly, determining the generator-load node pair most influencing each branch power flow in the cut-set by tracing the power flow, and realizing the bidirectional perturbation increasing and decreasing each branch power flow through controlling the generator-load node pair; further, determining the voltage stability critical points of the system in the cut-set power space by perturbed operating points, and acquiring local boundary approximation hyper-planes of the security region boundary in the two symmetrical perturbation directions of increasing and decreasing respectively by utilizing the critical points; and finally, acquiring the accurate results of the local boundary of the voltage stability region through the translational and weighted processing of the two local boundary approximation hyper-planes. The invention not only has higher computational efficiency, but also ensures that the acquired boundary hyper-plane contains the limit point corresponding to the current operating point, the error is relatively small, therefore, the invention has great practical value in engineering.

Description

technical field [0001] The invention belongs to the technical field of power systems, and relates to a method for solving the local boundary of a voltage stability domain. Background technique [0002] In recent years, there have been frequent blackouts around the world [1-2] Most of them are related to the voltage stability problem, which makes the voltage stability problem more prominent. Applying the domain method to voltage stability analysis can overcome some shortcomings of the traditional "point-by-point method", so the domain method has become an important means of online security assessment, monitoring and optimization [3-7] . [0003] Regardless of whether the power system is in normal operation or has serious failures, dispatchers often need to monitor the power flow of some key cut-set sections to achieve the purpose of improving system stability [8，9] . At this time, the cut set voltage stability region (CVSR) becomes a powerful tool for them to implement mo...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06N7/08H02J3/00
CPCY04S10/54
Inventor 贾宏杰穆云飞孙建伟徐宪东
Owner TIANJIN UNIV
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