A method for nonlinear sag control of hybrid multi-terminal HVDC system

A non-linear droop, power transmission system technology, applied in the field of power transmission and distribution, can solve the problems of easy over limit of DC voltage, unable to ensure stable operation of power grid, without considering the dynamic power margin of converter stations, etc., to achieve a reasonable size of droop coefficient, The effect of small static deviation

Active Publication Date: 2019-01-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

However, the slope of the traditional droop control is fixed, and the DC voltage is easy to exceed the limit. The dynami

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  • A method for nonlinear sag control of hybrid multi-terminal HVDC system
  • A method for nonlinear sag control of hybrid multi-terminal HVDC system
  • A method for nonlinear sag control of hybrid multi-terminal HVDC system

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Embodiment Construction

[0042] The present invention considers the current margin of each LCC converter station, and multiple converter stations jointly maintain the stability of the DC voltage, so that the converter station with a large current margin bears a large power variation, and the converter station with a small current margin The converter station bears a small amount of power variation to avoid the situation that some converter stations are fully loaded and lose the ability to respond to power changes. The invention can coordinate and distribute the active power of each converter station, and effectively reduce the static deviation of the DC voltage of each converter station.

[0043] The nonlinear droop control adopted by the converter station is a method of DC voltage droop control. When the converter station adopts the droop control, multiple converter stations with active power adjustment capability measure the change of the DC voltage according to the pre-established droop control. Th...

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Abstract

A method for nonlinear sag control of hybrid multi-terminal HVDC system the method performs nonlinear sag control on a plurality of LCC converter stations in a hybrid multi-terminal HVDC system, As that DC voltage of the HVDC transmission system is changed due to the change in transmission power, the LCC converter station automatically adjusts its transmission power, maintain the power balance ofHVDC system, Moreover, in the process of DC voltage stabilization by multiple LCC converter stations, the converter stations with larger current margin bear larger power variations, while the converter stations with smaller current margin bear smaller power variations, so as to avoid some converter stations losing the ability to respond to power variations due to full load. The invention fully considers the current margin of each converter station, and a plurality of LCC converter stations jointly maintain the stability of the DC voltage, so that the active power of each converter station canbe coordinated and distributed, and the static deviation of the DC voltage of each converter station can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution, in particular to a power coordination control method of a direct current transmission system based on nonlinear droop control. Background technique [0002] The high-voltage direct current transmission technology (voltage source converter-HVDC, VSC-HVDC) based on the voltage source converter can realize the independent control of active and reactive power, and does not need the commutation voltage and reactive power provided by the AC grid, which is conducive to the realization of new energy Power generation and grid connection. The high-voltage direct current transmission technology (line commutated converter-HVDC, LCC-HVDC) based on the commutated converter of the grid has the advantages of high technical maturity, low cost, and large capacity. Considering the characteristics of LCC and VSC converter technologies comprehensively, and combining the advantages of LCC-...

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Application Information

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IPC IPC(8): H02J3/36H02J1/00
CPCH02J1/00H02J3/36Y02E60/60
Inventor 刘英培杨小龙梁海平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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