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Recently lots of new technologies are introduced at the distribution level, and the distribution system is facing challenges on technology and management during reforming toward an Active Distribution System. The sustainability evaluation (SE) fits the new era better than the conventional reliability and economic evaluation. In this regard, by reviewing recent works on sustainability evaluation, the...
This paper presents a novel mathematical modeling method for the lithium-ion (Li-ion) battery considering the electrochemical properties (e.g., microscopic changes of the particles) and equivalent circuit model (ECM) transfer function format. The proposed model is based on the pseudo two-dimension (P2D) model, and the terminal voltage is divided into several parts, namely the open circuit voltage,...
An optimization method for centrifugal or mixed-flow pump impeller was proposed. The blade was indirectly parameterized using the angular momentum distribution and calculated by inverse design method. The design variables were separated into two categories: the meridional contour design variables and the blade design variables. Firstly, the blade shape was optimized using genetic algorithm and the...
The super large scale AC/DC hybrid network has taken shape in China, so the research on ATC calculation model and algorithm for AC/DC systems is urgently needed. Large amount of uncertainties and dynamic, continuous and time-varying features of AC/DC hybrid systems have great impacts on ATC. So, how to deal with these uncertainties in ATC calculation is of great significance. Markov chain has the...
This paper described a new approach for assessing dynamic load shedding amount of bulk power systems. It proposed a fast algorithm to estimate dynamic load shedding amount based on the transient energy margin sensitivity and the power flow distribution factor. The transient energy margin sensitivities are highly significant in quick determination of stability limits. The power flow distribution factors...
Power transformer is important to power system equipment. Due to the complex structure of power transformer, the running state of transform is difficult to be assessed accurately. The parameters of Support Vector Machine (SVM) have significant implications on the classification results. In order to obtain the best classification model, an improved particle swarm optimization (PSO) algorithm is introduced...
Transient stability analysis is a highly complex nonlinear problem in large-scale power systems. Lots of features can reflect the transient stability state. Selecting the appropriate input features which have strong relations with stability or stability index is one of the key factors that acquire a better result in the transient stability evaluation. This paper presented a method that excellently...
Transient stability can be rapidly assessed using the artificial intelligence technology. In this paper, a fast transient stability assessment method based on Bayesian network classifier was proposed from the perspective of data mining. First, select the characteristic quantities which reflect the power system transient process rapidly as the attribute variables of the Bayesian network classifier,...
Flexible AC transmission systems (FACTS) and their controllers are of great interest today. FACTS controllers can offer great opportunities in modern power system, allowing better and safer operation of the grid. Their technical benefits are very well acknowledged, but there are some factors limiting the widespread of this technology: a) lack of a comprehensive consideration of FACTS for multiple...
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