Based on the 2018 entire-gird primary frequency regulation and AGC test, the concrete procedures and obtained results of Shandong power grid are analyzed at length. In combination with the published standards and spec...
Based on the 2018 entire-gird primary frequency regulation and AGC test, the concrete procedures and obtained results of Shandong power grid are analyzed at length. In combination with the published standards and specifications, the new techniques adopted in the test are analyzed. And then, according to the emerging problems during the test, the improvement measures and optimization suggestions are proposed. With the help of analyzed results and proposed advices, the further technical supervision work of source-network coordination can be developed and thermal unit performance can be improved.
With the development of on-line monitoring and condition-based maintenance, the optimization research of condition-based maintenance scheduling is getting more and more important. A reasonable maintenance strategy can...
With the development of on-line monitoring and condition-based maintenance, the optimization research of condition-based maintenance scheduling is getting more and more important. A reasonable maintenance strategy can save a lot of energy and reduce costs. This paper proposes a method to determine the equipment to be maintained, which is based on the comprehensive risk assessment of power system. First we build a mathematical model of maintenance based on comprehensive risk index. Then non-sequential Monte Carlo simulation and DC power flow optimization model are used to minimize the sum of failure risks and maintenance risks. Finally, the feasibility and validity of the proposed model is analyzed on the IEEE-RTS79 system.
The gyro drift is the main factor in affecting the performance of the inertial platform which is an important unit in the navigation *** belief rule base(BRB) is used to construct the failure prognosis model of the in...
详细信息
The gyro drift is the main factor in affecting the performance of the inertial platform which is an important unit in the navigation *** belief rule base(BRB) is used to construct the failure prognosis model of the inertial platform which holds the following characteristics:(1) the storage lives are long and working lives are short,(2) a lot of testing data can not be obtained,(3) some expert knowledge may be available,and(4) the failure is *** order to solve the problems,two sub-BRBs are used with one employed to capture the relationship between the external stress and hidden failure and the other to construct the forecasting model of hidden *** experimental case study is examined to demonstrate the implementation and potential applications of the proposed failure prognosis model.
The falling of bird droppings near the insulator of overhead transmission lines will cause distortion of the electric field distribution near the insulator, resulting in air gap breakdown and flashover. Studying the a...
The falling of bird droppings near the insulator of overhead transmission lines will cause distortion of the electric field distribution near the insulator, resulting in air gap breakdown and flashover. Studying the area where there may be a risk of breakdown near the insulators in such a situation is of great significance for bird damage prevention of overhead transmission lines. Based on the finite element method, this paper established the 110kV transmission line model using ANSYS Maxwell finite element software and calculated the variation of the electric field distribution around the insulator when the bird droppings fall. Using the air gap average breakdown electric field strength as the criterion to judge whether breakdown occurs or not, the risk area of the air gap breakdown is determined, thereby determining the protection range of the transmission line for the flashover caused by the falling of bird droppings.
Quadruped robot has gained its popularity due to the adaptation ability of rough *** improve the walking stability and balance of quadrupeds,separate static walking methods are discussed based on specific known *** so...
详细信息
ISBN:
(纸本)9781467397155
Quadruped robot has gained its popularity due to the adaptation ability of rough *** improve the walking stability and balance of quadrupeds,separate static walking methods are discussed based on specific known *** some unknown terrains,a uniform terrain model is established in this paper.A fuzzy logic based terrain estimation method is then proposed to estimate the terrain *** on the criterion of maximum working space,a body posture and center of gravity(COG) position adjusting strategy is proposed,and a method to adjust the posture and COG position is derived based on the kinematic *** show that the proposed methods can deal with different terrains and body posture and COG position can be tuned according to the terrain.
In this paper, Hilbert-Huang transform(HHT) is introduced into the application of fault cause identification for transmission lines. This method is composed of empirical mode decomposition (EMD) and Hilbert transform....
In this paper, Hilbert-Huang transform(HHT) is introduced into the application of fault cause identification for transmission lines. This method is composed of empirical mode decomposition (EMD) and Hilbert transform. It can analyze the characteristics of signal frequency quantitatively and accurately[1]. By analyzing the information of four common faults from fault recorder, the Hilbert marginal spectrum and the Hilbert time-frequency spectrum can be considered as the feature of different fault causes which can be classified by a probability neural network (PNN). The results show that the method can effectively identify the cause of the fault and has a high accuracy.
This paper proposes a tradeoff based interactive multiobjective evolutionary algorithm (TIEA). It can support the decision maker (DM) to guide the search towards the DM's most preferred solution by combing evoluti...
详细信息
Wind power probabilistic forecasting is of great significance to the operation and dispatch of the power system. However, most researches have focused on how to predict wind power using local information rather than s...
详细信息
We consider the nearest-neighbor model on the finite tree T with generator L. We obtain a twosided estimate of the spectral gap by factor 2. We also identify explicitly the Lipschitzian norm of the operator(-L)^(-1) i...
详细信息
We consider the nearest-neighbor model on the finite tree T with generator L. We obtain a twosided estimate of the spectral gap by factor 2. We also identify explicitly the Lipschitzian norm of the operator(-L)^(-1) in propriate functional space. This leads to the identification of the best constant in the generalized Cheeger isoperimetric inequality on the tree, and to transportation-information inequalities.
In this paper, we propose a robust change detection method for intelligent visual surveillance. This method, named M4CD, includes three major steps. Firstly, a sample-based background model that integrates color and t...
详细信息
暂无评论