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EEAC-based AC/DC hybrid system transient stability control method

A transient stability, large-scale system technology, applied in AC network circuits, circuit devices, reducing/preventing power oscillations, etc., can solve the problem of low computational efficiency, long time consumption, and inability to theoretically obtain the DC emergency control amount. problems such as machine capacity, to achieve the effect of large adjustment capacity, great practicability, safe and stable operation and reliable operation

Active Publication Date: 2019-03-19
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] On the other hand, most of the current coordinated control strategies for DC emergency control and generator shutdown are qualitatively analyzed based on time-domain simulation, which has the disadvantages of low calculation efficiency and long time consumption, and it is impossible to theoretically obtain the DC emergency control amount and generator The cut-off amount does not solve the problem of how to coordinate and control among multiple resources from the mechanism

Method used

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  • EEAC-based AC/DC hybrid system transient stability control method
  • EEAC-based AC/DC hybrid system transient stability control method
  • EEAC-based AC/DC hybrid system transient stability control method

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Embodiment 1

[0057] figure 1 It is a flow chart of the transient stability control method of the AC / DC hybrid system based on EEAC of the present invention, figure 2 It is a schematic flow chart of the transient stability control method of the EEAC-based AC / DC hybrid system of the present invention, referring to figure 1 and figure 2 , the method includes:

[0058] S1 receives the power angle and power data of each generator after failure through the control center.

[0059] S2 identifies the unit group of each generator according to the power angle data.

[0060] Preferably, the extended equal area criterion EEAC is used to arrange the power angles of the generators from small to large, and to distinguish each generator into a critical unit group S and a remaining unit group A through the maximum gap discrimination.

[0061] EEAC uses the gap of the generator power angle δ to discriminate the critical unit group. The specific method is, when the system receives an impact, arrange t...

Embodiment 2

[0103] Figure 8 It is the power angle characteristic curve figure of the single-machine infinite system after the equivalent of embodiment 2;

[0104] Figure 9 It is the simulation result figure of embodiment 2 of the present invention

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Abstract

The invention provides an EEAC-based AC / DC hybrid system transient stability control method. The method comprises steps: the power angle and the power data of each generator after fault are received through a control center; each generator is subjected to generator group recognition; according to the power angle data and the power data, the recognized generator group is equivalent to a dual-generator system by adopting a corresponding local inertia center, the dual-generator system is then equivalent to a single-generator infinite system, and the single-generator infinite system curve is fit to a power angle relationship fitting curve after fault; and by using an extended equal area criterion strategy, transient stability discrimination is carried out. The method can effectively balance the unbalance between mechanical power and electromagnetic power after blocking fault, reduces the capacity of cut-off after fault, has great practicability, and can provide reliable guarantee for safeand stable operation of the power system.

Description

technical field [0001] The invention relates to the technical field of grid power supply, in particular to an EEAC-based transient stability control method for an AC / DC hybrid system. Background technique [0002] With the development of power grid power supply technology, my country's UHV operation scale has reached "six AC and five DC" by the end of 2016. The major regional power grids have been interconnected through UHV AC-DC transmission lines, and AC-DC hybrid has become the mainstay of my country's power grid. typical features. With the increase of the DC scale and the reduction of the electrical distance between the DC landing points, when the AC system at the receiving end fails, it may cause multiple DC commutation failures at the same time or successively. When multiple DC commutation fails, it is easy to cause DC The interruption of power transmission seriously threatens the safe and stable operation of the DC system. The large changes in the operation of this c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/24H02J2203/20
Inventor 和敬涵吴翔宇许寅石正王紫琪洪泽祺杨瑞
Owner BEIJING JIAOTONG UNIV
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