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Implicit-projection-based method for simulating stability of active power distribution system

An implicit projection algorithm and power distribution system technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as difficult calculation speed and numerical stability limitations

Inactive Publication Date: 2014-11-19
TIANJIN UNIV +2
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Problems solved by technology

Nevertheless, for the intelligent power distribution system with obvious multi-time scale characteristics, its numerical stability is still greatly limited, and it is very difficult to further improve its calculation speed

Method used

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  • Implicit-projection-based method for simulating stability of active power distribution system
  • Implicit-projection-based method for simulating stability of active power distribution system
  • Implicit-projection-based method for simulating stability of active power distribution system

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specific example

[0096] For the linear integration algorithm, the linear constant coefficient differential equation The solution of and the scalar equation

[0097] x · = λx

[0098] The solutions are equivalent, where λ is the characteristic root of the matrix A, so the above formula is also called the scalar test equation. For a given numerical integration algorithm, its numerical stability domain refers to the s domain, and the algorithm satisfies the numerical stability condition when solving the scalar test equation

[0099] |σ(hλ)|≤1

[0100] The set of hλ.

[0101] This example takes the explicit fourth-order Runge-Kutta method (hereinafter referred to as RK4 algorithm) as an example for the internal integrator of the implicit projection algorithm. According to the numerical stability conditions, the implicit projection algorithm, the traditional RK4 algorithm and the explicit The numerically stable region of the for...

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Abstract

The invention discloses an implicit-projection-based method for simulating the stability of an active power distribution system. According to an active power distribution system stability simulation model with the rigidity characteristics, based on system simulation parameters and load flow calculation results, the implicit-projection-based method includes the steps that firstly, a plurality of steps of small-step-length integral calculation are carried out through an internal integrator, wherein the step length is h, and any explicit integral algorithm with the accuracy higher than the second order can be adopted; secondly, a step of large-step-length integral calculation is carried out with the step length Mh through an external integrator based on an implicit prediction-correction method according to the calculation result of the internal integrator. By means of the implicit-projection-based method, simulating calculation of system faults can be achieved, the implicit-projection-based method is a second-order accuracy algorithm and has the good numerical stability, a numerical stability domain of the implicit-projection-based method is hardly changed along with changes of the multiple of the step length of the external integrator, the performance of the algorithm is better than that of the explicit projection integral algorithm and that of a traditional implicit trapezoidal method, the implicit-projection-based method is suitable for rapidly achieving the aim of simulating the stability of the active power distribution system with the multi-time scale characteristics, and a foundation is laid for efficiently and reliably developing an active power distribution system simulation program.

Description

technical field [0001] The invention relates to a stability simulation method of an active power distribution system. In particular, it relates to an implicit projection-based active power distribution system stability simulation method suitable for the stability simulation application of the active power distribution system including distributed power supply and energy storage. Background technique [0002] The large-scale and extensive access of distributed generation (DG) and the change of system load characteristics after the implementation of demand-side response technology all bring new challenges to the planning and operation of power distribution systems. The distribution network without DG is "passive", and the power used by the connected users is provided by the upper-level transmission network. When the distribution network is connected to DG to generate bidirectional power flow, the system is called "active distribution system". ". Active power distribution sys...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06Q50/06
CPCY02E60/00
Inventor 王成山原凯赵金利冀浩然李鹏丁茂生
Owner TIANJIN UNIV
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