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

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

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

CN101534010AInactive Publication Date: 2009-09-16TIANJIN UNIV
0 Cites 10 Cited by

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] The present invention is described in further detail below.

[0025] 1. Cutset voltage stability region (CVSR) and its boundary properties

[0026] 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:

[0027] I tf ={B 1 , B 2 ,...,B N} (1)

[0028] 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 P Itf Represents the power space of a cut set:

[0029]P Itf =[P I ,1,P I，2 ,...,P I，N ] (2)

[0030] 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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
16 Sep 2009
Publication
CN101534010A
IPC
H02J3/00; G06N7/08
CPC
Y04S10/54
Inventors
贾宏杰; 穆云飞