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Solution of transient voltage stability safety region of ac and dc power systems

A technology for transient voltage stability and AC/DC systems, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve problems such as dynamic safety domain solution methods that have not mentioned transient voltage stability constraints

Active Publication Date: 2019-01-15
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, there is no mention of the solution method of the dynamic safety domain of the transient voltage stability constraint of the AC and DC system, which is applicable to the boundary calculation of the transient voltage stability domain of the dynamic safety domain solution, and the system dynamic components that have an important impact on the transient voltage stability The analysis and the selection of its key parameters are regarded as important steps and have not been reported

Method used

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  • Solution of transient voltage stability safety region of ac and dc power systems
  • Solution of transient voltage stability safety region of ac and dc power systems
  • Solution of transient voltage stability safety region of ac and dc power systems

Examples

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Embodiment

[0082] see figure 1 , the method for solving the transient voltage stability safety region of the AC-DC system in this embodiment includes the following steps:

[0083] Step 1. Establish a transient voltage stability analysis model for AC and DC systems

[0084] In this example, the figure 2 The system diagram of three machines and nine nodes is shown, and a practical model of HVDC transmission system including generator third-order model, excitation system first-order model, induction motor third-order model and dynamic response calculation is constructed.

[0085] The third-order model equation of the generator is described as follows:

[0086]

[0087] The first-order model equation of the excitation system is described as follows:

[0088]

[0089] The third-order model equations of the induction motor are described as follows:

[0090]

[0091] The control equation of the low-voltage current-limiting control link (VDCOL) in the HVDC transmission system is de...

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Abstract

The invention discloses a method for solving a transient voltage stability safety region of an AC / DC system, which utilizes an energy function method and a singular induced bifurcation theory to analyze the transient voltage stability of the AC / DC system respectively. Based on the characteristics of transient potential energy of dynamic components in AC / DC system, the parameter space of key dynamic components used to describe the safety region is found. Furthermore, the boundary of the transient voltage stability security region determined by the stability manifold and singular surface of thetransient voltage instability-dependent dominant unstable equilibrium point is constructed. Then the boundary of the safety region determined by the stable manifold of the transient voltage instability-dependent dominant unstable equilibrium point and the boundary of the safety region determined by the singular surface are obtained by Q-linear approximation and second-order Taylor expansion respectively. By analyzing the influence of a plurality of dynamic components on the transient voltage stability in a multi-machine system, the invention selects key parameters to form a dynamic safety region space, which is favorable for an operator to quickly and effectively monitor the system.

Description

technical field [0001] The invention relates to the field of research on the transient voltage stability of a power system, in particular to a method for solving the transient voltage stability safety domain of an AC and DC system. Background technique [0002] Since the primary energy is mostly distributed in remote areas, it is developed into a large power source in order to pursue economies of scale, and the load center is often a big city, making the AC and DC system for long-distance and large-capacity transmission a typical mode of current power industry operation. Due to the increasing load, the expansion of the line network takes a long time, which makes the system operating pressure is increasing. When a serious fault occurs, the system faces many security and stability risks. Among them, the transient voltage instability of AC and DC systems is a field of great concern to planners and operators. [0003] By studying the mechanism of system transient voltage instab...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/26G06F17/50
CPCG06F30/20H02J3/00H02J3/26H02J2203/20Y02E40/50
Inventor 杜兆斌张文倩黄昌树夏成军
Owner SOUTH CHINA UNIV OF TECH
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