Numerical integration method for electric power system full dynamic simulation

A dynamic simulation, power system technology, applied in the direction of electrical digital data processing, information technology support systems, electrical components, etc., can solve the problem of slow simulation speed, to ensure numerical stability, improve calculation efficiency, and improve simulation calculation speed. Effect

Active Publication Date: 2009-06-03
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
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  • Application Information

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Problems solved by technology

But its disadvantages and problems are: in the medium and long-term dynamic process, the step size is basically the same as that of the electromechanical transient process, and the simulation speed is slow

Method used

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  • Numerical integration method for electric power system full dynamic simulation
  • Numerical integration method for electric power system full dynamic simulation
  • Numerical integration method for electric power system full dynamic simulation

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Embodiment Construction

[0039] Below, refer to the attached figure 1 The numerical integration method of the whole process dynamic simulation of the power system of the present invention is described in detail.

[0040] The complex long-term dynamic process of power system is mixed with fast dynamic process and slow dynamic process. The transient process after the power system is disturbed generally ends about 10 seconds after the disturbance. However, under the impact of severe faults or cascading failures, the active power or reactive power between system generation and load may appear unbalanced for a long period of time, which may cause electric quantities such as power flow, voltage and frequency, and prime mover system variables. The long-term process of change, and eventually lead to the system loses stability. In the long-term process of the power system, generally, it does not directly lead to the loss of load, but stimulates a series of systems to split into islands, lose power, and finally los...

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Abstract

The invention discloses a numerical integration method for electric power system full dynamic simulation, combining a fixed-step trapezoidal integration method and a variable-step Gear integration method organically in the full dynamic simulation. In the method, the fixed-step trapezoidal integration method, a differential equation of a dynamic element and an algebraic equation of power network are adopted to carry out iterative solution in a mechanical and electrical transient state process of the electric power system full simulation; in the method, the variable-step Gear integration method, the differential equation of the dynamic element and the algebraic equation of the power network are adopted to carry out simultaneous solution in a medium and long-term dynamic process. The fixed-step method and the variable-step method are switched automatically according to a certain strategy in the simulation. The method integrates the advantages of the two original numerical integration methods, thereby overcoming the defect of low calculational efficiency resulting from too small step in the simulation of mechanical and electrical transient state process of the electric power system of the existing full dynamic simulation program while ensuring numerical calculation stability and calculation accuracy.

Description

Technical field [0001] The invention relates to a simulation and calculation of a power system, in particular to a numerical integration method for the whole process dynamic simulation of the power system. Background technique [0002] Dynamic simulation of the whole process of power system refers to the organic integration of the electromechanical transient, medium and long-term process of the power system for digital simulation. It is the main tool for power system planning and design, dispatching operation and analysis and research. The whole process dynamic simulation of the power system can describe the whole continuous dynamic process after the power system is disturbed. The power system is continuous from the electromechanical transient process to the medium and long-term dynamic process, and is not completely separated: the transient process has an effect on the medium and long-term process, and the medium and long-term process also has an effect on the subsequent new tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06F17/10H02J3/00
CPCY04S40/22Y02E60/76Y02E60/00
Inventor 汤涌宋新立刘文焯候俊贤刘涛
Owner CHINA ELECTRIC POWER RES INST
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