Transient state stability control method and device based on trend to stable state

A transient stability and stable state technology, applied in the direction of reducing/preventing power oscillation, etc., can solve the problems that traditional control ideas are not applicable to power systems, and fail to make full use of the fast and powerful control capabilities of power electronic devices, so as to improve stability sexual effect

Active Publication Date: 2018-05-25
TSINGHUA UNIV
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Problems solved by technology

[0004] Therefore, the traditional control idea is no longer suitable for the current power system, especially the stability control requirements of the AC-DC interconnected power system with a high proportion of power electronic devices

Method used

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  • Transient state stability control method and device based on trend to stable state
  • Transient state stability control method and device based on trend to stable state
  • Transient state stability control method and device based on trend to stable state

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Embodiment Construction

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0030] Before introducing the transient stability control method and device based on the tendency to steady state, the traditional power system stability control method is briefly introduced.

[0031] With the continuous development of regional grid interconnection and long-distance centralized grid connection of renewable energy generation, a large number of power electronic devices are being connected to the power system, which has brought new problems to the safe and stable operation of the power system. For a power system wit...

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Abstract

The invention discloses a transient state stability control method and device based on a trend to a stable state. The method includes the following steps of obtaining different balance points which can be operated according to basic parameters of a power system, and determining an initial state set which can maintain the stability of the system, namely the initial state set trending to the stablestate; setting a multi-objective function constraint according to preset requirements, when the power system fails, obtaining the distance between the system state after the fault is cleared and the initial state trending to the stable state, and determining the initial state trending to the stable state which is the most similar to the current state of the system; through coordinated control of various power electronic devices in the power system, making the power system smoothly and rapidly transit to the most similar initial state trending to the stable state to achieve stable control overthe power system. According to the method, the system can smoothly transit to the most similar stable initial state trending to the stable state through coordinated control of the power electronic devices, so that there is no need to determine whether or not the system is unstable, stable control over the system is achieved, and the stability of the system is effectively improved.

Description

technical field [0001] The invention relates to the technical field of electromagnetic and electromechanical transient stability analysis of power systems, in particular to a transient stability control method and device based on a tendable stable state. Background technique [0002] In related technologies, in the existing transient stability analysis and control strategies of various power systems, it is necessary to first determine whether the system is unstable (entering an alert or emergency state), and then determine the control logic. If the system is not unstable, the emergency control strategy is not adopted, and if it is unstable, the pre-planned control strategy such as cutting machine and load is adopted. The traditional stability judgment methods mainly include time-domain simulation method, direct method and mixed method. The time-domain simulation method forms the mathematical model of the whole system according to the topological structure of each component ...

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 姜齐荣侯灵犀张春朋魏应冬
Owner TSINGHUA UNIV
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