CN108631290A - A kind of multi-infeed DC receiving end power grid direct current drop point screening technique - Google Patents
A kind of multi-infeed DC receiving end power grid direct current drop point screening technique Download PDFInfo
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- CN108631290A CN108631290A CN201710168887.9A CN201710168887A CN108631290A CN 108631290 A CN108631290 A CN 108631290A CN 201710168887 A CN201710168887 A CN 201710168887A CN 108631290 A CN108631290 A CN 108631290A
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- drop point
- direct current
- receiving
- index
- end system
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
Abstract
The invention discloses a kind of multi-infeed DC receiving end power grid direct current drop point screening techniques, the present invention first defines the node incidence coefficient index of assessment node degree of coupling, and the subsystem that receiving-end system is divided into several reciprocal effects weak by the power according to correlation degree between node, each direct current selects a subsystem alternately drop point region, all possible drop point constitutes scheme set, then all schemes are assessed using more feed-in short-circuit ratio index comprehensives and selects optimal direct current synchronizing point, the present invention adapts to the direct current drop point screening that a plurality of DC power transmission line concentrates the receiving end power grid of feed-in, it is effective to improve grid stability and economy, it is more easily implemented than existing methods.
Description
Technical field
The present invention relates to Power System Planning technical field, specially a kind of multi-infeed HVDC drop point based on coupling index
Screening technique.
Background technology
High voltage dc transmission technology has in economy, reliability, technical performance etc. compared to ac transmission very big excellent
Gesture, especially in terms of long term distance transmission of electricity.Characteristic distributions based on China's load and the energy, will by the end of the year two thousand twenty bottom China
Tens of hvdc transmission lines are built up, capacity is big, drop point intensive, operation regulation and control the complexity worlds Jun Shu are rare, therefore
Rational distribution direct current drop point can slow down the reciprocal effect between DC line and ac and dc circuit, reduce system jam
Probability, the safe operation of further safeguards system.The selection of direct current drop point is a Multiobjective Programming, is related at drop point
Multiple ATTRIBUTE INDEXs such as trend, stability, geological conditions, construction cost, usually selected section is fallen from alternative drop point region
Point, then generalized analysis obtain optimal synchronizing point.
Invention content
To achieve the above object, the present invention provides the following technical solutions：A kind of multi-infeed HVDC based on coupling index is fallen
Point screening technique, the selection method include the following steps：
(1) Z gusts of Y gusts of receiving-end system node admittance matrix and nodal impedance matrix are obtained according to system topological parameter；
(2) receiving-end system incidence matrix G is calculated；
(3) subregion is carried out to receiving-end system according to incidence matrix G interior joints coupling index and direct current drop point number x；
(4) each direct current drop point is to a subsystem；
(5) the corresponding direct current feed-in short-circuit ratio index of difference node in each subregion is calculated；
(6) globality (M is carried out to indexsum), harmony (Mbal), interference (Minf) three aspect comprehensive assessments, it obtains most
Excellent synchronizing point.
As a kind of preferred technical solution of the present invention, in the step (2), receiving-end system incidence matrix is mainly used for retouching
Correlation degree between two nodes is stated, calculation expression is：
Formula 1. in yijFor Y gusts of corresponding element, zijFor Z gusts of corresponding element, ⊙ representing matrixes are to element multiplication.
As a kind of preferred technical solution of the present invention, it is characterised in that：In the step (6), comprehensive assessment index letter
Number is：
The present invention is by more direct current receiving-end system network parameters, the index association system of characterization node stiffness of coupling is defined
Every direct current after system partitioning is selected a subsystem alternately drop point region, in a plurality of direct current by number according to incidence coefficient
The weak drop point combination of reciprocal effect degree alternately synchronizing point is directly filtered out in the receiving-end system of drop point, in conjunction with judge
More feed-in short-circuit ratio index screenings of receiving-end system power go out optimal synchronizing point.
Compared with prior art, the beneficial effects of the invention are as follows：The method of the present invention is candidate area at the beginning of planning drop point
The selection in domain provides theoretical foundation and screening technique, avoids and depends on operations staff's experience searching direct current unduly at the beginning of planning
The deficiency of drop point；Reduce evaluation work amount with conventional method ratio, improves the efficiency of screening direct current drop point.
Description of the drawings
Fig. 1 is receiving-end system subregion flow chart in the specific embodiment of the invention；
Fig. 2 is 39 node system of IEEE10 machines in the specific embodiment of the invention；
Fig. 3 is each more feed-in short-circuit ratio index block diagrams of scheme in the specific embodiment of the invention；
Fig. 4 is comprehensive evaluation index result of calculation block diagram in the specific embodiment of the invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment：
Step 1：Z gusts of Y gusts of receiving-end system node admittance matrix and nodal impedance matrix are obtained according to system topological parameter；
Step 2：Calculate receiving-end system incidence matrix G；
Step 3：According to incidence matrix G interior joint coupling indexs, receiving-end system is divided according to flow shown in FIG. 1
Area；
Step 4：Each direct current drop point is to a subsystem；
Step 5：Calculate the corresponding direct current feed-in short-circuit ratio (MISCR) of difference node in each subregion；
Z in formulaEq, ijFor the node self-impedance that system obtains after Thevenin's equivalence, ZEq, ijFor the direct mutual resistance of node
It is anti-.
Step 6：Globality (M is carried out to indexsum), harmony (Mbal), interference (Minf) three aspect comprehensive assessments, it obtains
To optimal synchronizing point.
With reference to concrete case, the present invention is described in further detail.
The present invention is using 39 node system of IEEE10 machines shown in Fig. 2 as research object, the validity of verification institute extracting method.It is false
If the direct current that 3 rated power of planning are 1000MW is fed into the system.
The node admittance matrix and nodal impedance matrix of case system are calculated, and then obtains system relationship matrix, and according to
Fig. 1 flows carry out subregion to case system, and division result is：
2 receiving-end system division result of table
The node contacts of cut-out 9 and 8,1 and 2 form independent partitions；26 and 28,29 nodes of cut-out contact to form one point
Area, remaining node belong to a subregion.
More feed-in short-circuit ratio indexs of each scheme are calculated, the results are shown in Figure 3.
Scheme matrix is standardized, comprehensive evaluation index calculating function is brought into conjunction with the weighted value of each ATTRIBUTE INDEX, obtains
To overall target as a result, as shown in Figure 4.
It can show that scheme 35 is optimal by Fig. 4 data comparisons, 3 circuits distinguish drop point to 1,20,28 nodes.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Profit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent requirements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
Claims (3)
1. a kind of multi-infeed HVDC drop point screening technique based on coupling index, it is characterised in that：Under the selection method includes
State step：
(1) Z gusts of Y gusts of receiving-end system node admittance matrix and nodal impedance matrix are obtained according to system topological parameter；
(2) receiving-end system incidence matrix G is calculated；
(3) subregion is carried out to receiving-end system according to incidence matrix G interior joints coupling index and direct current drop point number x；
(4) each direct current drop point is to a subsystem；
(5) the corresponding direct current feed-in short-circuit ratio index of difference node in each subregion is calculated；
(6) globality (M is carried out to indexsum), harmony (Mbal), interference (Minf) three aspect comprehensive assessments, it obtains optimal
Synchronizing point.
2. a kind of multi-infeed HVDC drop point screening technique based on coupling index according to claim 1, it is characterised in that：
In the step (2), receiving-end system incidence matrix is mainly used for correlation degree between two nodes of description, calculation expression
For：
Formula 1. in yijFor Y gusts of corresponding element, zjiFor Z gusts of corresponding element, ⊙ representing matrixes are to element multiplication.
3. a kind of multi-infeed HVDC drop point screening technique based on coupling index according to claim 1, it is characterised in that：
In the step (6), comprehensive assessment index function is：
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710168887.9A CN108631290A (en) | 2017-03-21 | 2017-03-21 | A kind of multi-infeed DC receiving end power grid direct current drop point screening technique |
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| CN201710168887.9A CN108631290A (en) | 2017-03-21 | 2017-03-21 | A kind of multi-infeed DC receiving end power grid direct current drop point screening technique |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102623987A (en) * | 2012-03-26 | 2012-08-01 | 中国电力科学研究院 | Multiple-DC (direct current)-droppoint selection method based on multiple feed-in short circuit ratios |
| CN104868478A (en) * | 2015-06-05 | 2015-08-26 | 东南大学 | Method for starting dynamic partitioning scheme under condition of power grid emergency |
-
2017
- 2017-03-21 CN CN201710168887.9A patent/CN108631290A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102623987A (en) * | 2012-03-26 | 2012-08-01 | 中国电力科学研究院 | Multiple-DC (direct current)-droppoint selection method based on multiple feed-in short circuit ratios |
| CN104868478A (en) * | 2015-06-05 | 2015-08-26 | 东南大学 | Method for starting dynamic partitioning scheme under condition of power grid emergency |
Non-Patent Citations (2)
| Title |
|---|
| 邵瑶等: "多馈入直流系统交互作用因子的影响因素分析", 《电网技术》 * |
| 郭小江等: "CIGRE 多馈入直流短路比指标影响因素及机理", 《电力系统保护与控制》 * |
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Application publication date: 20181009 |