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

A technology for power system and state estimation, which is applied in computing, electrical components, circuit devices, etc., and can solve problems such as increased computation

Inactive Publication Date: 2013-04-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • 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

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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 ...

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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

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00G06Q50/06
Inventor 张伯明吴文传郭烨孙宏斌
Owner TSINGHUA UNIV