An Electromagnetic Transient Simulation Method with Switching Subnetwork

A technology of electromagnetic transient simulation and switching sub-networks, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of weakening numerical oscillations, eliminate numerical oscillations, avoid jump errors, and improve accuracy Effect

Inactive Publication Date: 2018-07-06
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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  • An Electromagnetic Transient Simulation Method with Switching Subnetwork
  • An Electromagnetic Transient Simulation Method with Switching Subnetwork
  • An Electromagnetic Transient Simulation Method with Switching Subnetwork

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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]

[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, and its value is determined by the resistance, inductance and capacitance parameters of each branch;

[0050] Take the RL (resistance inductance) branch as an example, x, u, A K ,,B K The corresponding values ​​are as follows:

[...

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Abstract

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. In this method, circuit breakers and power electronic switching elements are designed into a single switch sub-network, and the network only includes power electronic switches, circuit breakers and their related components (resistance, inductance, capacitance, etc.). The approximate exponential fitting method is used for modeling, and the rest of the network is modeled by conventional methods (implicit trapezoidal method, backward Euler method, trapezoidal method with damping or its modified combination). In offline / real-time calculation, only the switch sub-network performs iteration or interpolation calculation, and the rest of the network does not participate in iteration or interpolation. Since the switch sub-network adopts the high-order algorithm proposed by the present invention, it can be immune to numerical oscillation, and at the same time, because the workload of modifying the model is small, it is beneficial to engineering popularization and realization.

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 Patents(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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