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Voltage source commutation-high voltage direct current (VSC-HVDC) power flow computing method based on three-stage convergence Newton method

A VSC-HVDC, power flow calculation technology, applied in the field of power system analysis and calculation

Inactive Publication Date: 2014-05-07
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a VSC-HVDC power flow calculation method based on the third-order convergent Newton method for the defects existing in the existing power flow calculation method

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  • Voltage source commutation-high voltage direct current (VSC-HVDC) power flow computing method based on three-stage convergence Newton method
  • Voltage source commutation-high voltage direct current (VSC-HVDC) power flow computing method based on three-stage convergence Newton method
  • Voltage source commutation-high voltage direct current (VSC-HVDC) power flow computing method based on three-stage convergence Newton method

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Embodiment Construction

[0026] 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

[0027]

[0028] 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 a three-stage convergence Newton method, which includes first deducing a stable power flow model of the VSC-HVDC, deducing a multivariable matrix solving format of a Newton iteration method with the three-stage convergence rate, applying the format into the VSC-HVDC power flow computing, and conducting simulation tests on four computing examples of an IEEE5-57 nodal point test system. The result proves that the computing method has good convergence characteristics and requires few iteration times compared with the classic Newton method under the condition that identical accuracy requirements are met. Trend computing speed is improved due to the fact that a factor table of Jacobian matrix triangular factorization is completely utilized in each step of iteration.

Description

technical field [0001] The invention relates to a VSC-HVDC power flow calculation method based on the third-order convergent Newton method, which 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 D...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36G06F17/16
CPCY02E60/60
Inventor 孙国强卫志农季聪韦延方杨雄袁阳陆子刚张伟刘玉娟陈凡潘春兰
Owner HOHAI UNIV