Unlock instant, AI-driven research and patent intelligence for your innovation.

Power system state estimating method for taking zero injection measurement equality constraint into consideration

A technology for power system and state estimation, applied in computing, electrical components, circuit devices, etc., and can solve problems such as the increase in calculation amount

Inactive Publication Date: 2011-09-14
TSINGHUA UNIV
View PDF2 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the traditional Lagrange multiplier method will greatly increase the number of optimization variables, resulting in a sharp increase in the amount of calculation

Method used

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
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Power system state estimating method for taking zero injection measurement equality constraint into consideration
  • Power system state estimating method for taking zero injection measurement equality constraint into consideration
  • Power system state estimating method for taking zero injection measurement equality constraint into consideration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] The method for estimating the state of a power system considering zero-injection measurement equation constraints proposed by the present invention includes the following steps:

[0036] 1. Treat the node injection power of zero injection node as 0 as an equality constraint, and establish a state estimation model with equality constraints such as (1):

[0037] min J(x) (1)

[0038] s.t c(x)=0

[0039] In (1), J(x) is the objective function of state estimation, and c(x) is the measurement equation of active and reactive zero injection pseudo-measurement of nodes without loads and generators. its component C i (x) can be expressed as:

[0040] V i Σ j ∈ i V j ( ...

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 relates to a power system state estimating method for taking zero injection measurement equality constraint into consideration, belonging to the technical field of power system dispatching automation and grid simulation. The method comprises the following step of: adding zero injection measurement as an equality constraint into an optimized model of state estimation to form an equality constraint-contained optimized model. As for the model, a voltage amplitude value and a phase angle of a zero injection node are used as basic variables and a voltage amplitude value and a phase angle of a nonzero injection node are used as nonbasic variables for participating in optimization; the basic variables and the nonbasic variables are solved by adopting a reduced gradient method; and the zero injection node voltage is confirmed according to nonzero injection node voltage. The method disclosed by the invention can ensure that a zero injection constraint equation is strictly met andsolve the problem that an estimating result does not meet a flow equation because zero injection node power mismatching amount is larger in the traditional power system estate estimation.

Description

technical field [0001] The invention relates to a power system state estimation method considering zero-injection measurement equation constraints, and belongs to the technical field of power system scheduling automation and power grid simulation. Background technique [0002] State estimation of power system is one of the core basic functions of energy management system (EMS). Almost all online and offline applications of EMS are based on state estimation results. There are a large number of zero-injection nodes with zero injection power in the actual power system. In the current least squares state estimation (WLS) program commonly used in dispatch centers, the usual processing method is to add pseudo-measurements of power injection into nodes with measurement values ​​of 0, and set a large weight for these pseudo-measurements. If the zero-injection measurement weight is set too small, there will be a large power mismatch in the zero-injection node in the final estimation...

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
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G06Q50/00
Inventor 张伯明吴文传郭烨孙宏斌
Owner TSINGHUA UNIV