The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Due to the structural design of the traditional matrix converter, the voltage transfer ratio is limited to 0.866. In this paper, we purposed a new one-step boost type matrix converter, which can change the voltage transfer ratio variable from the perspective of changing the topological structure. The topological structure of one-step boost type matrix converter not only improved the voltage transfer...
In this paper, a model independent PD with sliding mode control (PD-SMC) method for the bionic eye system is proposed. The designed controller is model independent, and has the advantages of both simple structure, easy design of PD controller and strong robustness of SMC method with respect to system parameter uncertainty. Lyapunov techniques and LaSalle's invariance theorem are used to support the...
In this paper, loss equivalent models of power electronic elements are built to discuss the power loss and efficiency of power electronic systems in real-time simulation. Based on element's dynamic characteristic and loss theory, loss equivalent models which include power switch, inductor and capacitor are established. A real-time simulation circuit of boost converter is tested and compared with the...
Well logging technology is of great significance to oil production. A new lateral resistivity logging-while-drilling (LWD) method applied in oil-based drilling fluid condition is proposed in this paper by combining capacitive coupling with inductive coupling principle. By using a new logging model, the ineffectiveness of the conventional resistivity LWD methods in oil-based drilling fluid is overcome...
Power battery is the heart of electric vehicles, and the accurate state of charge (SOC) estimation is crucial for the management of the power battery. This paper proposes an adaptive strong tracking unscented Kalman filter (ASTUKF) algorithm to estimate the SOC of lithium-ion battery. This method doesn't need to compute the Jacobian matrix compared with the traditional strong tracking filter. This...
State-of-charge (SOC) estimation methods based on battery model rely heavily on the accuracy of model parameters. And these parameters could vary with environment and the types of batteries. Online battery modeling methods can improve the robustness of SOC estimation algorithms through updating model constantly with real-time data. These methods have far more profound significance on algorithm adaptability...
Most existing fault diagnosis approaches based on Petri net are applied in transmission network, and usually utilize the action information of relay protection and breaker to form the diagnosis model which is not suitable for radial distribution network. In this paper, a novel Petri net model based on fault information of FTUs is proposed. The rapidity and fault tolerance of distribution network fault...
Accurately modeling the dynamic behavior of a lithium-ion battery is one of the major themes for researches on state of charge (SOC) estimation. A large number of experiments were performed at different discharge rates and operating temperatures for three compact lithium-ion batteries aiming at determining the relationship of open circuit voltage (OCV) with SOC. The curve of OCV-SOC is approximated...
In this paper, the research on the observation method of state of charge (SOC) of the Li-ion battery is carried on aiming at the current problems of the low precision of the SOC observation results, an accurate and efficient SOC observation method is designed for Li-ion battery based on a 2nd-order RC model with variable parameters. Firstly, the A Amper-Hour (AH) integral estimator is built according...
In the paper, a simple equivalent circuit model is built between transmitting coil and receiving coil via coupled magnetic resonance, and the simulation of frequency and efficiency is also supply. Node equations for the resonance coils are built by using the equivalent circuit and the optimum distance is analytically derived for optimum coupling coefficient for high transmission efficiency. The equivalent...
As more and more distributed generations are connected to the grid, the features of micro grid, are no longer the same as conventional grids. A micro-grid fault diagnosis method based on redundant Petri net considering temporal constraints is put forward in this paper. Firstly, a tripartite criterion for fault location is proposed on basis of Wide-area information protection method. Secondly, The...
Precise Estimation of battery state of power (SoP) is crucial for designing the energy management strategy of power system in electric vehicles (EVs) and hybrid electric vehicles (HEVs). In this paper, a novel online model-based estimation algorithm of SoP is proposed for the lithium-ion battery considering the monotonicity of output power and the influence of battery state of health (SoH). Genetic...
Aiming at that it is difficult to choose the value of virtual damping(VD) in passivity-based controller of the Boost converter, this paper proposes an approach which can be used to calculate and optimize the value of VD. The range of VD can be determined by constraining overshoot of the current response of Boost converter. The optimal VD can be found in the range of VD by genetic algorithm(GA) and...
Permanent Magnet Synchronous Motor (PMSM) as the key component of the Electric Vehicles (EVs), has numerous advantages over other synchronous motors. Fault diagnosis is essential to guarantee the safety and continuity of the operation for EVs. An undetected fault in the PMS M system may lead to high repair cost, or even catastrophic failure. Among lots of faults in the PMSM, the most serious are short...
As the power source of electric vehicles, lithium-ion batteries directly affect the performance and life of electric vehicles. The charging strategy of lithium-ion battery directly affects the charging speed, energy consumption and life of the battery. In view of above problems, the multi-segment constant current charging strategy of lithium-ion battery is designed and the particle swarm optimization...
A novel fractional-order Kinetic Battery Model (KiBaM) is proposed to accurately describe the battery nonlinear characteristic of the available capacity under discharge. Firstly, the influence of different discharge current on battery available and unavailable capacity is analyzed. Then, with the theory of fractional calculus, a novel KiBaM model model equation is proposed to characterize the battery...
On the basis of establishing mathematical model of induction machine, the simplifying assumption of two-dimensional plane finite element model was proposed, and Dirichlet and main boundary conditions were defined. The speed governing of induction machine was realized using back-to-back voltage-fed frequency converter. The continuous output direct voltage value of three-phase non-controlled rectifier...
State of charge is a significant indicator with respect to the remaining capacity for the lithium-ion battery. Nonetheless, strong nonlinearity and time-varying attributes resulting from the complicated electrochemical reactions incur the tremendous difficulty to acquire the accurate state directly. To address the above problems, a novel estimation method based on unscented Kalman filter and dual-filters...
The structure and working principle of hybrid energy storage system are introduced. The classical RC model of ultracapacitor is analyzed, and the topology of charging and discharging converter of energy storage system is studied. A ultracapacitor-battery hybrid energy storage system model based on bidirectional boost-buck circuit is constructed, and the charging and discharging process of the energy...
This paper proposes a simulated model of micro-grid control system based on IEC61850 standardized information network. In the model process level, a micro grid consisting of 2 DGs and 4 feeders is simulated by a C program generated from a Simulink Coder. In the model bay level and station level, IEC61850 communication infrastructure is simulated to include intelligent electronic devices server and...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.