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Active distribution network probabilistic stability analysis method in consideration of distributed photovoltaic randomness

An active distribution network and distributed photovoltaic technology, which is applied in photovoltaic power generation, parallel feeding arrangement of single network, etc., can solve the problem of less disclosure of probability stability, and achieve balanced simulation calculation efficiency, high accuracy, and improved accuracy. sexual effect

Active Publication Date: 2019-05-31
SOUTHEAST UNIV +3
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Problems solved by technology

However, there are few publications on the probabilistic stability of distributed photovoltaics and the systems they are connected to in the current literature, and they are generally limited to the research on a single inverter. sex analysis method

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  • Active distribution network probabilistic stability analysis method in consideration of distributed photovoltaic randomness
  • Active distribution network probabilistic stability analysis method in consideration of distributed photovoltaic randomness
  • Active distribution network probabilistic stability analysis method in consideration of distributed photovoltaic randomness

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[0018] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings. It should be understood that the embodiments provided below are only intended to disclose the present invention in detail and completely, and fully convey the technical concept of the present invention to those skilled in the art. The present invention can also be implemented in many different forms, and does not Limited to the embodiments described herein. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention.

[0019] refer to figure 1 , the present invention starts from the probabilistic stability of the active distribution network, and establishes the key mode damping ratio of the system as a polynomial model of each photovoltaic solar irradiance based on the probability distribution method, revealing the photovoltaic output power caused by the random change of the solar irradiance Uncertainty...

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Abstract

The invention discloses an active distribution network probabilistic stability analysis method in consideration of distributed photovoltaic randomness. In view of the distributed photovoltaic random fluctuation characteristics, a new strategy for analyzing the active distribution network small interference stability is provided based on a probability distribution method. The method can establish the polynomial estimation model of the critical mode damping ratio of the active distribution network with respect to each photovoltaic random solar irradiance, and reveals the influence of photovoltaic output power uncertainty caused by the random variation of solar irradiance on the small interference stability of the active distribution network. On this basis, by obtaining the photovoltaic solarirradiance data, the probability density function of the system critical mode damping ratio is estimated and the probability of system instability is further calculated. The invention uses a nonlinear estimation model and a probability analysis method to improve the accuracy of the stability analysis result.

Description

technical field [0001] The invention relates to the stability analysis of an active distribution network, in particular to an analysis method for the stability of an active distribution network considering the randomness of distributed photovoltaics. Background technique [0002] With the large-scale access of distributed photovoltaics, the distribution network is gradually moving towards power electronics. The access of distributed photovoltaics has changed the dynamic characteristics of the distribution network, and its low inertia and fast response may bring instability to the power grid in a wider frequency band. At the same time, the randomness and volatility of distributed photovoltaics make the operating point of the distribution network more variable, the uncertainty is more prominent, and the stability analysis is more difficult. The research shows that the active distribution network with a high proportion of distributed photovoltaic access has potential dynamic s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/56
Inventor 窦晓波齐宗强杜健雄吴在军盛万兴徐斌李冬森
Owner SOUTHEAST UNIV
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