Power system transient stability simulating method based on implicit numerical integration

A technology of transient stability and numerical integration, applied in information technology support systems, electrical components, circuit devices, etc., can solve problems such as large amount of calculation and calculation speed that cannot meet the online calculation requirements of power systems

Inactive Publication Date: 2012-07-25
ZHEJIANG UNIV
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Problems solved by technology

[0011] The purpose of the present invention is to solve the problem that the existing numerical integration method has a large amount of calculation and the calculation speed cannot meet the online calculation requirements of the power system in the power system transient stability simulation method. State Stability Numerical Simulation Method

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  • Power system transient stability simulating method based on implicit numerical integration
  • Power system transient stability simulating method based on implicit numerical integration
  • Power system transient stability simulating method based on implicit numerical integration

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Embodiment Construction

[0053] The present invention will be further described below in conjunction with accompanying drawing.

[0054] A kind of power system transient stability simulation method based on implicit numerical integration proposed by the present invention comprises the following steps:

[0055] Step 1: Input the original parameters and information of the system, and perform power flow calculation to obtain the operating variable values ​​under steady-state conditions , including the generator node voltage , the current injected into the network and generator electromagnetic power ;

[0056] Step 2: Calculate the initial value of the state variable power angle , the initial value of angular frequency , the initial value of the state vector subvector composed of the transient and subtransient potential of the generator, the state variables of each dynamic link of the excitation and speed control system ;

[0057] Step 3: Form differential equations and network algebraic equ...

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Abstract

The invention discloses a power system transient stability simulating method based on implicit numerical integration. Compared with an existing power system transient stability numerical simulation implicit trapezoidal integration method, the power system transient stability simulating method employs a power-angle integration formula with a smaller local truncation error, namely, enables a non-linear differential equation set for describing a power system transient process to be expressed as a linear portion and a non-linear portion. An accurate analysis expression of a state transition matrix is obtained by reasonably selecting a system matrix of the linear portion as a singular matrix, and a group of implicit integration formulas is obtained by leading linear integrable functions to be approximate to the non-linear portion of the differential equation set. The local truncation error of the power-angle implicit integration formulas of the generator refers to O (h5) which is larger than a local truncation error O (h3) of implicit trapezoidal integration, the calculated quantity of integration each time is equivalent to that of the implicit trapezoidal integration. By means of the high-precision implicit integration formulas, iteration times of each integration step under the same iteration precision condition are decreased, so that the simulated calculated quantity is remarkably decreased.

Description

technical field [0001] The invention belongs to the professional field of electric power system automation, and relates to a numerical integration method for calculating the transient stability of electric power systems. Background technique [0002] Power system transient stability analysis is one of the most core and basic contents in power system analysis and calculation. Due to the continuous expansion of the scale of modern power systems, control technologies such as online dynamic security analysis, security and stability emergency control, preventive control, and intelligent dispatching have been gradually promoted and used in power systems. The prerequisite for realizing these advanced technologies is to be able to perform fast, accurate and reliable transient stability simulation calculations for large-scale power systems. [0003] The analysis methods used for power system transient stability calculation mainly include numerical integration method, direct solution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50H02J3/00
CPCY02E60/76Y04S40/22Y02E60/00
Inventor 王建全李梦骄赵志奇
Owner ZHEJIANG UNIV
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