Power System Subsynchronous Resonance Analysis Method Based on Aggregate rlc Circuit Model

A sub-synchronous resonance and power system technology, applied in the field of power systems, can solve problems such as analysis errors, disregard of dynamic characteristics, inapplicability of SSR risk assessment and quantitative analysis, etc., to reduce analysis errors and improve analysis accuracy Effect

Active Publication Date: 2018-04-10
TSINGHUA UNIV +3
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Problems solved by technology

[0004] However, in the previous impedance modeling process, for the convenience of derivation, the quasi-steady-state model of the motor was mostly used without considering its dynamic characteristics
Moreover, the control strategy of the controller in the system is also simplified accordingly, ignoring the dynamic characteristics of some controllers
Although these simplified operations are beneficial to the establishment of the system impedance model, they have brought analysis errors that cannot be ignored. The original impedance model can only use the Nyquist stability criterion to judge the stability of the system, and is not suitable for accurate assessment and quantitative analysis of SSR risks.

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  • Power System Subsynchronous Resonance Analysis Method Based on Aggregate rlc Circuit Model
  • Power System Subsynchronous Resonance Analysis Method Based on Aggregate rlc Circuit Model
  • Power System Subsynchronous Resonance Analysis Method Based on Aggregate rlc Circuit Model

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Embodiment Construction

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0035] In the present invention, unless otherwise clearly specified...

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Abstract

The invention discloses a power system subsynchronous resonance analysis method based on an aggregated RLC circuit model, which includes the following steps: establishing a power plant model and a series compensation transmission system model to obtain nonlinear differential equation models of each subsystem; according to special working conditions The following parameters and nonlinear differential equation model generate state equation model; generate algebraic equation model according to Laplace transform and state equation model; obtain the final equivalent impedance model to obtain the series resonance point; according to the series resonance point, the final equivalent Impedance models aggregated into equivalent second-order RLC circuit models; quantitative SSR analysis. The analysis method of the embodiment of the present invention performs quantitative SSR analysis by aggregating equivalent impedance models into an equivalent second-order RLC circuit model, realizes accurate quantitative evaluation of SSR, reduces analysis errors, and improves analysis accuracy.

Description

technical field [0001] The invention relates to the technical field of electric power systems, in particular to a power system subsynchronous resonance analysis method based on an aggregated RLC circuit model. Background technique [0002] Fixed series capacitor compensation can effectively improve the transmission capacity of the line and the transient stability of the power system, and it is more and more widely used in modern power systems. However, the interaction between the fixed series compensation and the surrounding turbogenerators or wind turbines is likely to cause a special power system stability problem, that is, SSR (Subsynchronous Resonance, subsynchronous resonance). SSR has adverse effects on the stability of the machine network and equipment safety. For example, SSR causes fatigue damage to the mechanical system of the large shaft of the steam turbine unit, reduces the life of the unit and even causes the main shaft to break, causing serious equipment damag...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/06G06Q50/06
Inventor 谢小荣刘华坤李雨刘辉李蕴红胡应宏岳巍澎马步云
Owner TSINGHUA UNIV
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