This paper revolves around the application of the dual stator-winding induction generator in the field of wind power generation. It involves establishing a mathematical model of the dual stator-winding wind turbine and proposing an excitation start-up method for the generator. The study begins by describing the structure, working principle, and excitation start-up method of the dual stator-winding generator, and leverages the Matlab/Simulink to establish the simulation model of the dual stator-winding induction generator. In this study, we conducted simulation and analysis to evaluate the performance and excitation starting method for the generator and carried out a prototype test. The results demonstrate that the dual stator-winding wind turbine can obtain a stable low-voltage power supply at the auxiliary winding end of the generator at different speeds by adjusting the rotor excitation currents, and can provide stable excitation voltage for the rotor end through the converter. Moreover, the stator end of the generator can yield stable-frequency and high-voltage output.
Abstract Nowadays, The microgrid(MG) provides a way for the stable access of many kinds of distributed energy to power grid, and multi-agent system(MAS) is an important control form and general utility tool of it. MAS can separate large, complex systems into small ones that can communicate and coordinate with each other and can be easy to manage. This paper starts from the concept and characteristics of MAS and microgrid, analyzes the wide range of MAS applications in micro-grid and its necessity. Then this paper focuses on the communication process of MAS in different scenarios (power restoration and power dispatch), and clearly demonstrates the convenience and practicality of MAS in MG applications. Finally, the paper looks forward to the application of MAS in MG, and believes that the emergence of 5G technology will greatly expand the application field of MAS.
The original character of cartoon works has been the most valuable element of commercial use.Their intellectual property protection issues mainly related to two aspects of copyright and trademark.The protection of cartoon character as an independent expression of copyright protection need to meet a certain criterion.The role of the Trademark Law can provide cross-protection.While the significant elements of the carton character can be allowed to be registered,so as to the duration of copyright protection restrictions can be overcome.However,the cross-protection of the well-known character of has brought the shortcomings of over-protection as a result.Therefore,in the legislative and judicial practice there should be a reasonable sub-sector of rights among the author,trademark owners and public interests,taking into account the goals of encouraging innovation and promoting the use of the characters.
The ride-hailing market often experiences significant fluctuations in traffic demand, resulting in supply-demand imbalances. In this regard, the dynamic subsidy strategy is frequently employed by ride-hailing platforms to incentivize drivers to relocate to zones with high demand. However, determining the appropriate amount of subsidy at the appropriate time remains challenging. First, traffic demand exhibits high non-stationarity, characterized by multi-context patterns with time-varying statistical features. Second, high-dimensional state/action spaces contain multiple spatiotemporal dimensions and context patterns. Third, decision-making should satisfy real-time requirements. To address the above challenges, we first construct a Non-Stationary Markov Decision Process (NSMDP) based on the assumption of ride-hailing service systems dynamics. Then, we develop a solution framework for the NSMDP. A change point detection method based on feature-enhanced LSTM within the framework can identify the changepoints and time-varying context patterns of stochastic demand. Moreover, the framework also includes a deterministic policy deep reinforcement learning algorithm to optimize. Finally, through simulated experiments with real-world historical data, we demonstrate the effectiveness of the proposed approach. It performs well in improving the platform’s profits and alleviating supply-demand imbalances under the dynamic subsidy strategy. The results also prove that a scientific dynamic subsidy strategy is particularly effective in the high-demand context pattern with more drastic fluctuations. Additionally, the profitability of dynamic subsidy strategy will increase with the increase of the non-stationary level.
Abstract To raise the energy cascade use ratio and economic benefit, the multi-energy complementation-based integrated energy system (IES) has been considerably developed in recent years, so studying its internal optimal dispatching strategies will be of great importance. In this study, an optimal dispatching strategy applicable to the operation of typical IES was put forward. First, the classical IES architecture and the operating characteristics of each piece of equipment in it were explored. Second, a mixed-integer programming model with uncertainties was constructed for three energy systems—cooling, heating and power—and each equipment in these systems. In the end, the demonstration park of a major project in China was analyzed using the proposed strategy. The effectiveness of this strategy was verified by the simulation results.
Abstract Large scale space measurement technology is one of the key technologies of aircraft assembly. The accuracy of measurement system affects the efficiency and quality of aircraft assembly directly. However, the accuracy of the measurement system depends on the process of constructing the measurement system. Therefore, this paper explores three principles of constructing high-precision large-scale space measurement system, through a large number of experiments and simulations.
This paper carries the study on the accessibility analysis method of loop-pipe-network with multi-gas-source. For the unreasonableness of conventional designing method of loop-pipe-network with multi-gas-source, the accessibility analysis mathematical model is established with relevant theory of graph theory, hydromechanics and linear algebra, and the solution method of the mathematical model of accessibility analysis is set. The accessibility analysis method could achieve the reliability and economy of network.
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