Electromagnetic transient simulation method containing switching characteristic sub-network

A technology for electromagnetic transient simulation and switching subnets, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., and can solve problems such as weakening numerical oscillations

Inactive Publication Date: 2016-01-20
TSINGHUA UNIV +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Later, there were some improvement methods such as interpolation or reinitialization to weaken the numerical oscillation, but these methods did not fundamentally solve the problem

Method used

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  • Electromagnetic transient simulation method containing switching characteristic sub-network
  • Electromagnetic transient simulation method containing switching characteristic sub-network
  • Electromagnetic transient simulation method containing switching characteristic sub-network

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Embodiment Construction

[0044] The electromagnetic transient simulation method of the power system with switching characteristic branch proposed by the present invention, its flow chart is as follows figure 1 shown, including the following steps:

[0045] (1) Divide the power system into two parts: the switch subnet and the conventional subnet, such as figure 2 as shown in (a);

[0046] (2) Establish a branch-level electromagnetic transient equivalent model for the above switch subnet, the specific process includes the following steps:

[0047] (2-1) Set the state space equation of each component in each branch in the switch subnet as:

[0048] d x d t = A K x + B K u

[0049] Among them, A K ,,B K are the given parameters of each component in each branch, A K ,,B K is a real number, ...

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Abstract

The invention relates to an electromagnetic transient simulation method containing a switching characteristic sub-network, and belongs to the technical field of electromagnetic transient analysis in electric power systems. According to the simulation method, a breaker and electronic power switching elements are designed into an independent switching sub-network; the network only comprises an electronic power sub-switch, the breaker and related elements (resistors, inductors, capacitors and the like); the network performs modeling through a rational polynomial approximation based exponential fitting method provided by the invention; and the rest of networks perform modeling by a conventional method (an implicit trapezoid method, a backward Euler method, a damping trapezoidal method or a modified combining form thereof). In offline/real-time calculation, only the switching sub-network performs iteration or interpolation calculation, and the rest of networks do not participate in iteration or interpolation. The switching sub-network adopts a high-order algorithm provided by the invention, so that numerical oscillation can be immunized; and meanwhile, the workload of model modification is relatively low, so that engineering promotion is facilitated.

Description

technical field [0001] The invention relates to an electromagnetic transient simulation method including a switch characteristic branch, and belongs to the technical field of electromagnetic transient analysis of power systems. Background technique [0002] The numerical simulation research of the electromagnetic transient state of the power system is a long-standing research topic. When performing the electromagnetic transient simulation of the power system, if there is a switch action on the network, a change in the network structure, or a fault, the state variable will change suddenly. If the traditional implicit trapezoidal algorithm is still used, non-prototype numerical oscillations will occur. In addition, when the control system is simulated, the one-step time lag between the control system and the main system will also cause numerical instability. In addition, high-frequency system mutations caused by power electronic switches pose new challenges to power system sim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 舒德兀刘栋张树卿朱琳寇龙泽
Owner TSINGHUA UNIV
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