Emergency control method for small signal stability state of new energy power system

A small disturbance stability, power system technology, applied in the direction of circuit devices, AC network circuits, reducing/preventing power oscillation, etc., can solve the problem of increasing small disturbance instability

Active Publication Date: 2017-03-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

With the vigorous development of new energy, environmental problems and energy sustainable development have been alleviated, but at the same t

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  • Emergency control method for small signal stability state of new energy power system
  • Emergency control method for small signal stability state of new energy power system
  • Emergency control method for small signal stability state of new energy power system

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Embodiment Construction

[0044] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0045] In the following description, a lot of specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described here, and those skilled in the art can do it without departing from the meaning of the present invention. By analogy, the present invention is therefore not limited to the specific examples disclosed below.

[0046] Overall, such as...

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Abstract

The invention discloses an emergency control method for a small signal stability state of a new energy power system, and relates to the technical field of new energy power system control methods. The method comprises the following steps of determining a key mode damping ratio to be a random output variable; fitting the key mode damping ratio and a random input vector by adopting a random response surface method and carrying out Hermite polynomial chaos expansion; monitoring the power system by using a Hermite polynomial chaos expansion-based formula and building a rescheduling optimization problem about random input variables once the unstable state of the power system is detected; and solving the rescheduling optimization problem, obtaining emergency control measures according to the solving result and implementing the emergency control measures. According to the method disclosed by the invention, the small signal stability state of the new energy power system can be monitored in real time; and an emergency control scheme is quickly given during small signal instability.

Description

technical field [0001] The invention relates to the technical field of new energy power system control methods, in particular to an emergency control method for small disturbance stable states of new energy power systems. Background technique [0002] In order to suppress the low-frequency oscillation, there have been a lot of researches on PSS, FACTS additional damping controller, HVDC additional damping controller and so on. However, once serious low-frequency oscillation occurs, due to time constraints, many methods are limited, mainly relying on the experience of the dispatcher to reduce the output or load of the generator. It matters a lot. Therefore, a fast and effective emergency control method will be of great significance. With the vigorous development of new energy sources, environmental issues and energy sustainable development issues have been alleviated, but at the same time, it has also brought more uncertain factors to the power system, increasing the probab...

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/24H02J2203/20
Inventor 周一辰李永刚于徳水刘伟东
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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