LCC-HVDC Simulation Model and Parameter Optimization Method Based on Inductor/Capacitor Switch Model

A technology of LCC-HVDC and capacitive switching, applied in the direction of design optimization/simulation, special data processing applications, etc., can solve the problems of low simulation effect and efficiency

Active Publication Date: 2022-02-18
SHANGHAI JIAOTONG 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

Method used

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  • LCC-HVDC Simulation Model and Parameter Optimization Method Based on Inductor/Capacitor Switch Model
  • LCC-HVDC Simulation Model and Parameter Optimization Method Based on Inductor/Capacitor Switch Model
  • LCC-HVDC Simulation Model and Parameter Optimization Method Based on Inductor/Capacitor 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

A LCC-HVDC simulation model and parameter optimization method based on the inductance / capacitance switch model, using the inductance / capacitance equivalent switch for the modeling and simulation of the LCC-HVDC of the six-pulse rectification system, according to the working state of each thyristor Analyze and obtain the instantaneous transient response, steady-state response, and switching loss of the inductance / capacitance equivalent switch and the ideal switch in different working states, and take the minimization of the difference function between the equivalent switch and the ideal switch as the optimization goal to achieve model parameter optimization So that the inductance / capacitance equivalent switch approaches the ideal switch. In the process of simulating a power system containing a large number of LCC-HVDCs, the present invention can make the admittance matrix of the whole system not change with the change of the switch state of the switch element, thereby avoiding the problem of multiple inversions of large matrices and improving large-scale Efficiency of system simulation.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 贺杨烊郑晓冬邰能灵黄文焘余墨多
Owner SHANGHAI JIAOTONG UNIV
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