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Compound system voltage stability discrimination method under extra-high voltage direct-current layered access way

An ultra-high voltage DC, layered access technology, applied in power transmission and AC networks, etc., can solve the problems of voltage stability, unfavorable power flow evacuation of the receiving end system, etc.

Active Publication Date: 2016-04-27
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the continuous increase of DC transmission capacity and the denser DC landing points, the existing DC access method will not be conducive to the power flow evacuation of the receiving end system, and will bring a series of problems in terms of voltage support and other aspects
[0003] In order to effectively solve the problem of multi-DC feeding into the AC system from the perspective of the grid structure, some scholars have proposed a method of UHV DC layered access to the AC grid, which can effectively improve some of the above problems, but based on the grid commutation converter The current DC transmission system still has inherent voltage stability problems

Method used

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  • Compound system voltage stability discrimination method under extra-high voltage direct-current layered access way
  • Compound system voltage stability discrimination method under extra-high voltage direct-current layered access way
  • Compound system voltage stability discrimination method under extra-high voltage direct-current layered access way

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Embodiment Construction

[0041] The specific implementation manner of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0042] 1. According to the equivalent model of the system under the UHV DC layered access mode, the characteristic equation of the system is established (taking the 500kV side as an example):

[0043] P di = 2C i u i 2 [cos2g i -cos(2g i +2m i )]

[0044] Q di = 2C i u i 2 [2m i +sin2g i -sin(2g i +2m i )]

[0045] I di = K i u i [cosg i -cos(g i +m i )]

[0046] u di =P di / I di

[0047] P aci =[U i 2 cosq i -E i u i cos(d i +q i -y i )] / |Z eqi |(1),

[0048] P ij =[U i 2 cosq ij -U i u j cos(d i +q ij -d j )] / |Z eqij |

[0049] Q aci =[U i 2 sinq i -E i u i sin(d i +q i -y i )] / |Z eqi |

[0050] Q ij =[U i2 sinq ij -U i u j sin(d i +q ij -d j )] / |Z eqij |

[0051] Q Ci =B Ci u i 2

[0052] In the formula, i, j=1, 2 represent 500kV layer and 1000kV layer r...

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Abstract

The invention provides a compound system voltage stability discrimination method under an extra-high voltage direct-current layered access way. The method comprises the following steps: on the basis of an equivalent model of an alternating current and direct current system under the extra-high voltage direct-current layered access way, deducing to obtain a calculation method of the VSF (Voltage Stability Factor) of each layer of converter bus of a compound system and the CVSF (Comprehensive Voltage Stability Factor) of the system; according to a give system parameter, calculating the value of the VSF of each layer of converter bus and the value of the CVSF; and according to the VSF, judging whether system voltage loses stability. Compared with the prior art, the compound system voltage stability discrimination method carries out quantization on the voltage stability characteristics of the alternating current bus of the compound system under a new access way that extra-high voltage is subjected to direct-current layered access into a receiving end power grid to be favorable for analysis. According to the VSF, the weakness of the voltage stability of the alternating bus of the compound system is judged, and the compound system voltage stability discrimination method can be used for guiding practical extra-high voltage direct-current layered access engineering researches.

Description

technical field [0001] The invention relates to a method for judging the voltage stability of a hybrid system in an ultra-high voltage direct current layered access mode, and belongs to the technical field of ultra-high voltage direct current transmission. Background technique [0002] At present, the UHV DC transmission projects that have been built in China mainly adopt the multi-infeed single-layer access method. With the wide application of UHV AC and DC technology, multi-circuit DC centralized feeding into the load center of the receiving end will become a common phenomenon in my country's power grid. With the continuous increase of DC transmission capacity and the denser DC landing points, the existing DC access method will not be conducive to the power flow evacuation of the receiving end system, and will cause a series of problems in voltage support and other aspects. [0003] In order to effectively solve the problem of multi-DC feeding into the AC system from the ...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCY02E60/60H02J3/36
Inventor 汤奕朱亮亮陈斌戴玉臣王琦李辰龙
Owner SOUTHEAST UNIV
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