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The study of low voltage ride through of photovoltaic power generation system mainly focuses on the two aspects: the appropriate control strategy and the addition of external hardware devices. In this paper, a hybrid control method is proposed to improve the low voltage ride through (LVRT) capability. Fault conditions, rapid suppression of voltage fluctuation of photovoltaic power generation system...
The primary researches are mainly of two measures focused on a suitable control strategy and an additional hard-ware circuit to enhance the LVRT capability of photovoltaic (PV) system. In this paper, according to the Grid Integration Technical Regulation of PV station published by state grid crop, a hybrid control method composed of software and hardware are presented to enhance the capacity of low-voltage...
For a very thin dielectric MOS capacitor, the influence of the interface layer on MOS capacitance extraction is not negligible. We report a new correction method for a thin dielectric MOS capacitor based on the five-element model, which includes MOS capacitance, parallel resistance, series resistance, interface capacitance, and interface resistance. This method needs to combine double-frequency $C$ ...
This paper aims to model the accelerometer with nonlinearity by applying least square support vector regression (LS-SVR). A one-pass modeling approach based on LS-SVR with mixed kernel function is proposed. It could construct the linear approximated model and the nonlinear characteristics at one time. A LabVIEW-based automatic measurement system for accelerometer dynamic characteristics is designed...
We call a finite graph G = (V,E) a binary network if the state set of its nodes has only two elements, say, 0 and 1, representing respectively ‘OFF’ and ‘ON’ state. A switch at node v switches both the state of v and the state of each of its neighbors. It is shown in [1] that given any initial state of a network of order n > 3, we can always reach at a consistent status, i.e., either all the nodes...
When the control function of a variable universe fuzzy controller is transmitted to the offspring, there are usually some 'distortions' which lead to the error of the algorithms. To solve this problem, this paper proposes a novel optimal method of variable universe fuzzy control based on Q learning algorithm. This algorithm gives an idea of adjusting universes by contraction-expansion factors and...
Double valves system simulation model is established in AMESim environment, By comparing with experiment, The simulation model can accurately predict injection characteristics of the double valves system. The influence of the parameters such as piston diameter, cam velocity, piston matching clearance, SV valve lift, NCV valve lift, needle valve lift and injector diameter on the main fuel injection...
In academic circles, there are some controversial issues at present, such as difference and relation between exergy analysis and exergy transfer, discipline belongingness of exergy transfer and so on. Taking theoretical research in depth on exergy transfer into consideration, it is necessary to clarify these problems. This paper starts with illustrating the scientific definition of energy, and then...
The oil displacement mechanism in steam injection obtained from the indoor simulation experiments is analyzed, namely some thermal-hydraulic-mechanics-chemical coupling relation in oil reservoir porous media. The phenomenological equation for transfer process of multi-field coupling deduced from the non-equilibrium thermodynamics is simple in form and rich in connotation. The driving force of oil...
The microturbine is a complex thermal dynamic model. It is impossible to achieve accurate control because of its uncertainty and nonlinearity. In order to realize its steady control and fully exert its advantages among the distributed generation, the auto disturbance rejection control is introduced. Based on the feedback of rotational speed, extended-state observer is established. Also the controller...
This paper presents a new method to calculate the harmonic conditions for systems including switching-mode electronic nonlinear elements. The method is based on the harmonic coupled admittance matrix models for nonlinear elements. A thyristor controlled reactor (TCR) was used as an example of the nonlinear element to demonstrate the performance of the proposed method. Since the admittance model for...
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