A parameter design method for smoothing reactors in a ring-mesh flexible DC transmission system

A technology for smoothing reactors and flexible DC, which is applied in parameter calibration/setting, electrical components, circuit devices, etc., and can solve the problem of single design basis for smoothing reactor parameters and lack of systematic calculation in ring-network flexible DC transmission systems In order to reduce the range of parameters, avoid fault current surge stress damage, and avoid failure to break fault current

Active Publication Date: 2019-01-29
HUAZHONG UNIV OF SCI & TECH +2
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  • Claims
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Problems solved by technology

[0007] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for designing smoothing reactor parameters of a ring-mesh flexible direct current transmission system, thereby solving the problem that existing smoothing reactor parameters have relatively single design basis. Determining the technical problem of the lack of systematic calculation steps and ambiguous constraints in the ring-meshed HVDC system

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  • A parameter design method for smoothing reactors in a ring-mesh flexible DC transmission system
  • A parameter design method for smoothing reactors in a ring-mesh flexible DC transmission system
  • A parameter design method for smoothing reactors in a ring-mesh flexible DC transmission system

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Embodiment 1

[0077] Embodiment 1 of the present invention takes a four-terminal ring mesh flexible DC power transmission system as an example, as Figure 4shown. The power of the three rectifier stations is 1000MW, the power of the inverter station is 3000MW, the rated voltage of the DC bus is 500kV, the inductance of the bridge arm is 80mH, the resistance of the bridge arm is 0.5Ω, a single bridge arm contains 218 sub-modules, and the capacitance of the sub-module is 15mF. To simplify the calculation, it is assumed that the DC bus distances between the converter stations are equal, the line resistance is 1Ω, and the line reactance is 100mH. The transformer adopts Y0 / Δ connection mode, the grid side / valve side transformation ratio (1-1, rms) is 525 / 260kV, the rated impedance per unit is 15%, and the rated capacity is 1700MVA. Assume that the selected DC circuit breaker has a maximum shut-off current of 10kA and a break time of 3ms. Assuming that the fault occurs at the positive DC bus, t...

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Abstract

The invention discloses a parameter design method for a smoothing reactor of a looped-network flexible DC power transmission system, and the method comprises the steps: obtaining an expected operation state when a DC side of the flexible DC power transmission system has a unipolar grounding fault; obtaining all limiting conditions of the parameter design of the smoothing reactor based on the expected operation state; jointing all limiting conditions after a fault current of the DC side is completed removed, and obtaining the value range of the parameters of the smoothing reactor of the flexible DC power transmission system. Compared with an existing method for the determining of a low threshold value, the method provided by the invention proposes the clearer limiting conditions for the calculation of the fault current, thereby further reducing the size of the range of the parameters needed by the smoothing reactor, and enabling the calculation result to be clearer.

Description

technical field [0001] The invention belongs to the technical field of flexible high-voltage direct current transmission, and more specifically relates to a parameter design method of a smoothing reactor of a ring-mesh flexible direct current transmission system. Background technique [0002] With the increasingly serious problems of energy shortage and environmental pollution, my country has begun to gradually develop renewable clean energy such as wind energy and solar energy to optimize the overall energy structure. However, due to its inherent characteristics of dispersion and miniaturization, clean energy causes problems such as long-distance and unbalanced energy collection and transmission, making it uneconomical to use AC transmission technology for networking. Therefore, in view of the current multi-point collection and flexible consumption of large-scale clean energy, under the demand for large-capacity long-distance transmission, HVDC (high-voltage direct-current)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/28H02H7/26H02H3/00
CPCH02H3/006H02H7/268H02H7/28
Inventor 林磊李成竹许韦华李泓志周季胡家兵
Owner HUAZHONG UNIV OF SCI & TECH
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