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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 process of simulating a power system containing a large number of LCC-HVDC, the admittance matrix of the entire system can not change with the change of the switching state of the switch element, thereby avoiding the problem of multiple inversions of large matrices and improving the simulation of large systems. efficiency

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  • 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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