LCC-HVDC simulation model and parameter optimization method based on inductance/capacitance switch model

A technology of LCC-HVDC and capacitive switching, which is applied in design optimization/simulation, electrical digital data processing, special data processing applications, etc. It can solve the problems of simulation effect and low efficiency, and achieve the effect of improving efficiency

Active Publication Date: 2018-09-14
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0005] The present invention aims at the problem of low simulation effect and low efficiency caused by using a binary resistor as a switch in LCC-HVDC simulation in the prior art, and proposes an LCC-HVDC simulation model and parameter optimization method based on an inductance/capacitance switch model. In the pr...

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  • LCC-HVDC simulation model and parameter optimization method based on inductance/capacitance switch model
  • LCC-HVDC simulation model and parameter optimization method based on inductance/capacitance switch model
  • LCC-HVDC simulation model and parameter optimization method based on inductance/capacitance switch model

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Embodiment Construction

[0019] Since the rectifier and inverter used in HVDC transmission are composed of six-pulse rectifiers or inverters, this embodiment takes a six-pulse rectifier system as an example to analyze the voltage, Current state is analyzed.

[0020] The working principle of the six-pulse rectifier system simplifies the circuit as figure 2 As shown, in the figure u a , u b , u c is the three-phase voltage of the AC bus on the rectifier side, L r is the inductance converted from the transformer to the valve side, L d is the smoothing reactance.

[0021] When the three-phase voltage is a power frequency sine wave, the first to sixth thyristors VT1~VT6 are triggered in turn at equal intervals; when the three-phase voltage on the AC side is balanced, the instantaneous expression of the phase voltage is: Where: u is the effective value of the phase voltage.

[0022] The first thyristor VT1 has three states: on, off, and commutation. The commutation is divided into on-commutation an...

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Abstract

The invention discloses a LCC-HVDC simulation model and parameter optimization method based on an inductance/capacitance switch model. An inductance/capacitance effective switch is used for LCC-HVDC modeling and simulation of a six-pluse rectification system; according to the working state of each thyristor, an instant-switching transient response, a steady state response and switching loss are obtained after analysis when the inductance/capacitance effective switch and an ideal switch are in different working states; a minimized difference function of the effective switch and the ideal switchserves as an optimal object, and model parameter optimization is achieved so that the inductance/capacitance effective switch can be approximate to the ideal switch. According to the LCC-HVDC simulation model and parameter optimization method, in the process that a power system containing a large amount of LCC-HVDC is simulated, admittance matrixes of the whole system cannot be changed along withthe on-off state of a switch original, the problem of multiple times of inversion of a large quantity of matrixes is solved accordingly, and large system simulation efficiency is improved.

Description

technical field [0001] The invention relates to a technology in the field of power system control, in particular to an LCC-HVDC simulation model and parameter optimization method based on an inductance / capacitance switch model. Background technique [0002] The grid-commutated converter (LCC-HVDC) in the power system is mainly composed of thyristors and is an important part of the AC-DC hybrid grid. Fast and accurate simulation of it is of great significance to the safe and stable operation of the grid. For the simulation technology of LCC-HVDC, the two-value resistance switch model is mostly used now, that is, the on-state and off-state of the thyristor of the converter are equivalent to a small resistance and a large resistance respectively. In this way, when the system scale is small, the calculation burden is acceptable. However, when simulating the entire AC-DC hybrid power grid, there are dozens of DC lines, and hundreds of switching devices need to be simulated. When...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 贺杨烊郑晓冬邰能灵黄文焘余墨多
Owner SHANGHAI JIAO TONG UNIV
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