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Multi-feed-in DC recovery process VDCOL control parameter optimization method

A technology of multi-feed DC and recovery process, applied in power transmission AC network and other directions, can solve problems such as lack of calculation verification

Active Publication Date: 2014-11-26
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] To sum up, there are many studies on VDCOL in single-circuit DC control, and the research on multi-infeed DC transmission system is mainly qualitative research, mainly for the analysis of VDCOL characteristics during the fault process and different situations after the fault, and the study of VDCOL large Some of them are analyzed with classic parameters, lacking theoretical calculation verification

Method used

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  • Multi-feed-in DC recovery process VDCOL control parameter optimization method

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Experimental program
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Embodiment

[0052] 1. DC quasi-steady state model

[0053] figure 1 For the DC quasi-steady-state model diagram, please refer to figure 1 As shown, V dor ,V doi are the DC no-load voltage values ​​of the rectifier side and the inverter side respectively, α and β are the trigger angle of the rectifier station and the lead angle of the inverter station respectively, R cr , R d , R ci are the equivalent commutation resistance of the rectifier side, the equivalent resistance of the DC line and the equivalent commutation resistance of the inverter side, respectively. At present, the converter stations of DC power transmission projects basically use 12-pulse converter valves. From the characteristics of each link of DC power transmission, the control characteristics of DC power transmission can be obtained as follows:

[0054] V dor = 6 ...

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Abstract

The invention discloses a multi-feed-in DC recovery process VDCOL control parameter optimization method, comprising steps of establishing an optimized module target function, establishing PQ coupling simplified model to obtain a constraint condition of the optimized model target function, calculating all equations of the PQ coupling simplified model in order to obtain the minimum value Qmax, min of a wattles power peak value consumed by the inverter station after optimization, and determining the optimized VHj, VLj, IHj, and ILj. The invention summarizes the recovery characteristics of the voltage of the convertor station, simplifies the calculation method of active power and wattless power, establishes the PC coupling recovery simplified model, quantitively reflects the changing pattern of the active power and the wattless power after the fault, calculates and analyzes the influence of the VDCOL parameter, and reduces the wattless power requirement of the multi-circuit DC common recovery for the receiving terminal power grid.

Description

technical field [0001] The invention relates to a method for optimizing VDCOL control parameters in a multi-infeed DC restoration process of a high-voltage direct current transmission system, belonging to the technical field of power system control operation protection. Background technique [0002] In the control mode of the DC transmission system, changing the control parameters of the low-voltage current limiting (VDCOL) link can control the recovery characteristics of the active power of the DC transmission system after a fault, so it plays an important role in the study of the recovery after the DC fault. In the AC-DC power transmission system with multi-infeed DC, if the electrical distance of the multi-circuit inverter stations is very close, when a serious fault occurs in the power grid near one of the inverter stations (such as a three-phase metallic ground short circuit), It may cause the commutation bus voltage of multiple inverter stations to drop significantly, ...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 周保荣罗东豪杜兆斌洪潮
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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