Continuation power flow algorithm considering field current constraint and armature current constraint of power generator

A technology of excitation current and armature current, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as deviation

Active Publication Date: 2012-07-18
HOHAI UNIV +1
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Problems solved by technology

In practice, the reactive power output capability of the generator is not constant. With the increase of the active power output of the generator, the reactive power output capability of the generator decreases monotonously due to the influence of the excitation current and the armature current, so The static voltage stability analysis using the constant reactive power limit model has a large error, and the obtained voltage stability margin is too optimistic and deviates from the actual situation

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  • Continuation power flow algorithm considering field current constraint and armature current constraint of power generator
  • Continuation power flow algorithm considering field current constraint and armature current constraint of power generator
  • Continuation power flow algorithm considering field current constraint and armature current constraint of power generator

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Embodiment Construction

[0050] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0051] Such as figure 1 As shown in the synchronous generator capacity curve, the armature current limit is a circle with the origin as the center, circle with radius. Due to the existence of the salient pole effect, the excitation limit curve is not a circle in the strict sense. In the special case X d =X q =X (that is, the hidden pole machine), the excitation limit can be regarded as (0, -V 2 / X) is the center of the circle, circle with radius. The intersection of the maximum output limit of the prime mover and the armature current limit is the limit operating point of the generator. according to figure 1 The following conclusions can be drawn:

[0052] (1) The active power output of the generator has a great influence on its reactive power output capability, and the constant reactive power limit model will cause large errors;

[0053] (2) When the ge...

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Abstract

The invention discloses a continuation power flow algorithm considering field current constraint and armature current constraint of a power generator, which belongs to the technical field of electric power system stable analysis and control. Considering the influence of the field current constraint and the armature current constraint of the power generator on a reactive power output of the power generator, reactive output models under the maximal field current constrain and the maximal armature current constraint are respectively established, a Jacobian matrix is corrected in the continuation power flow calculation, power flow solution can be obtained through iteration, a pressure-volume (PV) curve is drawn, and more precise voltage stability margins can be obtained. In addition, the invention also provides a method for identifying a type of a static bifurcation point and key constraint conditions, so the type of the static bifurcation point and the key constraint condition causing the voltage failure can be identified, and the system prevention control validity can be improved.

Description

technical field [0001] The invention relates to a continuous power flow algorithm considering generator excitation current constraints and armature current constraints, and belongs to the technical field of power system stability analysis and control. Background technique [0002] In the past 30 years, there have been many voltage collapse accidents in power systems at home and abroad, which makes the research on voltage stability problems arouse widespread attention in the world. Static voltage stability analysis is one of the important functions in automatic voltage control system (Automatic Voltage Control-AVC) and energy management system (Energy Management System-EMS), which plays an important role in the evaluation and early warning of power grid security operation. Since the continuation power flow algorithm (Continuation Power Flow-CPF) was proposed in the 1990s, it has developed into one of the main analysis methods in the static voltage stability analysis of power ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/50
Inventor 赵晋泉钱天能
Owner HOHAI UNIV
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