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Voltage source commutation-high voltage direct current (VSC-HVDC) power flow computing method based on automatic differential (AD) and reserving non-linear method

A technology of VSC-HVDC and power flow calculation, which is applied in the field of power system analysis and calculation, and can solve problems such as the increase of variable types and the difficulty of solving Jacobian matrix.

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

[0004] Due to the addition of VSC-HVDC, the types of variables in the power flow calculation have increased, and the solution to the Jacobian matrix has brought certain difficulties

Method used

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  • Voltage source commutation-high voltage direct current (VSC-HVDC) power flow computing method based on automatic differential (AD) and reserving non-linear method
  • Voltage source commutation-high voltage direct current (VSC-HVDC) power flow computing method based on automatic differential (AD) and reserving non-linear method
  • Voltage source commutation-high voltage direct current (VSC-HVDC) power flow computing method based on automatic differential (AD) and reserving non-linear method

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Embodiment Construction

[0022] figure 1 It is a flow chart of the method of the present invention. figure 2 It is the AC-DC hybrid system model used in the present invention. figure 2 where i represents the i-th VSC connected to the DC network. Assume that the fundamental voltage phasor output by the i-th VSC is The voltage phasor at the connection with the AC system is The impedance of the converter transformer is jX Li , R i is the equivalent resistance of the internal loss of the i-th converter and the loss of the converter transformer, and the active power and reactive power of the AC system flowing into the converter transformer are P si and Q si , the active power and reactive power flowing into the converter bridge are P ci and Q ci , where the current flowing through the converter transformer is Assume the direction as figure 1 as shown, then

[0023]

[0024] The complex power flowing into the converter transformer in the AC system Satisfy the following relationship:

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Abstract

The invention discloses a voltage source commutation-high voltage direct current (VSC-HVDC) power flow computing method based on automatic differential (AD) and a reserving non-linear method, which applies the AD technology to solution of the problem of alternating-direct current power flow containing VSC-HVDC through the reserving non-linear method. The AD is utilized to automatically generate Jacobian matrix of a power flow equation. Compared with manual programming, the method reduces handwriting code quantity, improves developing efficiency of programs. Further, the Jacobian matrix of the method is more constant, so that iteration times are increased compared with the traditional unifying iteration method. The AD only needs to be called once to form the Jacobian matrix, and program operation time is greatly reduced. A plurality of computing examples verify effectiveness of the method in solving alternating-direct current power flow problems. The results of the computing example prove that the reserving non-linear method is higher in speed than the traditional unifying iteration method under the same conditions.

Description

technical field [0001] The invention relates to a VSC-HVDC power flow calculation based on an AD and nonlinear method, and belongs to the field of power system analysis and calculation. Background technique [0002] Power system power flow calculation is a basic electrical operation to study the steady state operation of power system. Its task is to determine the operating state of the entire system according to the given operating conditions and network topology, such as the voltage (amplitude and phase angle) on each bus, the output of each generator, the power distribution and power loss in the network, etc. The result of power system power flow calculation is the basis of power system stability calculation and fault analysis. [0003] With the development of power grid construction, DC transmission is more and more widely used in the power grid, and more and more AC-DC hybrid systems will appear. Compared with the thyristor-based current source DC transmission, the new...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
Inventor 卫志农刘玉娟季聪孙国强孙永辉韦延方杨雄袁阳陆子刚张伟陈凡潘春兰
Owner HOHAI UNIV
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