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Power system transient stability simulation method based on explicit numerical integration

A transient stability and power system technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problems that the calculation speed cannot meet the online calculation requirements of the power system, and the calculation amount is large

Inactive Publication Date: 2012-07-04
ZHEJIANG UNIV
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Problems solved by technology

[0011] The purpose of the present invention is to solve the shortcomings of the existing numerical integration method in the transient stability analysis and calculation of the power system, which has a large amount of calculation and the calculation speed cannot meet the online calculation requirements of the power system. Based on the second-order generator model, a new method is proposed. Transient Stability Simulation Method

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  • Power system transient stability simulation method based on explicit numerical integration
  • Power system transient stability simulation method based on explicit numerical integration
  • Power system transient stability simulation method based on explicit numerical integration

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with accompanying drawing.

[0039] A power system transient stability simulation method based on explicit numerical integration proposed by the present invention comprises the following steps

[0040] Step 1: Input the original parameters and information of the system, perform power flow calculation and calculate the electromagnetic power of each generator and the state variable power angle of each generator and angular frequency The initial value of , get the initial value , and , where i=1, 2, ... ( is the number of generators);

[0041] Step 2: Form differential equations and network algebraic equations describing the transient process of the system, and perform network algebraic equation factorization;

[0042] Step 3: Set the initial value moment of transient stability calculation , determine the integral step size h used in the transient stability calculation, and carry out the...

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Abstract

The invention discloses a power system transient stability simulation method based on explicit numerical integration, which is suitable for a generator to adopt a second order model, and overcomes the shortcomings of a conventional power system transient stability numerical integration method that the computing quantity is large and the computing speed can not meet the on-line computing requirement of a power system. Compared with the conventional power system transient stability numerical integration method, in the power system transient stability simulation method provided by the invention,the characteristic that analytical expression exists in a second derivative d<2>Delta / dt<2> of a power angle Delta is utilized to deduce the explicit second-order single-step integration formula of the motion equation of a generator rotor, which has the local truncation error of O(h<3>), and the computing quantity is equivalent to the explicit Euler method with the local truncation error of O (h<2>); and the characteristic that when the generator adopts the second order model to describe, only the power angle is required to be obtained during solving the network algebraic equation set is alsoutilized, and the differential-algebraic equation is only required to be solved at one time in each integration step. By adopting the invention, the speed of the transient stability simulation computation based on explicit numerical integration is remarkably increased, and the method is equivalent to half of the improved Euler method.

Description

technical field [0001] The invention belongs to power system automation, and in particular relates to a power system transient stability simulation method using a second-order model for a generator. Background technique [0002] Power system transient stability analysis is one of the most basic and core contents in power system analysis and calculation. Advanced technologies such as online dynamic security analysis, security and stability emergency control, preventive control, and intelligent dispatching have been gradually required to be popularized and applied in power systems. The precondition for realizing these advanced technologies is fast, accurate and reliable transient stability simulation calculation for large-scale power systems. [0003] Commonly used methods for power system transient stability analysis mainly include numerical integration method, direct method, and hybrid analysis method combining numerical integration and direct method. Numerical integration...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
Inventor 王建全武同心赵志奇
Owner ZHEJIANG UNIV
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