A Calculation Method of DC Access Capability of Receiving Power Grid Considering Multiple Constraints

A technology of receiving power grid and access capability, applied in computing, electrical components, electrical digital data processing, etc., can solve problems such as the inability to fully meet the requirements of power grid operation control, reduce blind DC construction, reduce operation risks, and improve economy. effect of benefit

Active Publication Date: 2018-05-25
NARI TECH CO LTD +1
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Problems solved by technology

The patent "A Calculation Method for DC Power Receiving Scale of AC Receiving-End Power Grid" (application number CN 201410104305.7) proposes a calculation method for DC power receiving scale of AC receiving-end power grid. This method only considers the constraints of DC multi-feed short-circuit ratio, Can not fully meet the grid operation control requirements

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  • A Calculation Method of DC Access Capability of Receiving Power Grid Considering Multiple Constraints
  • A Calculation Method of DC Access Capability of Receiving Power Grid Considering Multiple Constraints
  • A Calculation Method of DC Access Capability of Receiving Power Grid Considering Multiple Constraints

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Embodiment Construction

[0044] The present invention will be described in further detail below with reference to the accompanying drawings.

[0045] figure 1 The step 1 described in step 1 is based on a certain grid, remember that M DCs have been connected, and the capacity of each DC is P d,i (i=1,2,...,M), forming a typical operation mode, in which the connected M DCs are all full-capacity transmission, according to the substation site conditions, power balance, etc. to determine the set of candidate DC drop points, assuming a common N optional DC drop points;

[0046] figure 1 Step 2 described in step 2 is to determine the new DC access point based on the short-circuit capacity of each candidate DC drop point and the degree of interaction between each DC in a typical way. The initial capacity of the new DC drop point is recorded as P new (P new Related to the DC voltage level, ±500kV is generally 3000MW, ±800kV is generally 8000MW, and ±1000kV is generally 10000MW. The default initial connection cap...

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Abstract

The invention discloses a method for calculating the direct current access capability of a receiving-end power grid considering multiple constraints, and belongs to the technical field of power systems and automation thereof. The invention determines the set of alternative DC drop points according to the substation site conditions, power balance, etc., and determines the newly added DC access drop point according to the short-circuit capacity of each alternative DC drop point and the interaction degree between each DC drop point in a typical mode , comprehensively considering multiple constraints such as DC multi-infeed short-circuit ratio, power grid peak-shaving capability in valleys, relative moment of inertia index, N‑1 transient stability, etc., iteratively gives the DC access capability of the receiving end power grid. The content of the invention is beneficial to guide the power grid planning department to reasonably plan the DC location of the receiving end grid, provide a reasonable level of the receiving end grid's access to DC capacity, reduce the blindness of DC construction, and improve the level of grid operation control.

Description

Technical field [0001] The present invention belongs to the technical field of power systems and their automation. More precisely, the present invention relates to a method for calculating the DC access capability of the receiving end power grid considering multiple constraints. Background technique [0002] High voltage direct current (HVDC) transmission has become an important form of large-scale interconnection and long-distance large-capacity transmission in China with its unique advantages, and has played an important role in the optimization of my country's large-scale resource allocation. With the continuous development and construction of power grids, it is inevitable that multiple DC transmission lines will fall on the same AC receiving-end power grid. Both China Southern Power Grid and East China Power Grid have developed into typical DC multi-infeed receiving-end power grids, and DC feed-in capacity continues to grow. [0003] In order to better guide the construction of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J5/00G06F19/00
Inventor 李兆伟翟海宝刘福锁李建华李威黄志龙李碧君周霞崔晓丹侯玉强
Owner NARI TECH CO LTD
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