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Due to the randomicity and instability of the wind energy, the wind power generation system has some robust control problems, such as the parameter uncertainties, disturbance rejection, imprecise model, and so on. Based on the analysis of the wind turbine operation characteristics, the generator speed has to be rapidly adjusted with the wind speed changing to capture the maximum power. For the variable...
A novel feedback control scheme for speed regulation of permanent magnet synchronous motor (PMSM) is presented based on energy-shaping and port-controlled Hamiltonian (PCH) systems theory. The desired state error port-controlled Hamiltonian structure is assigned to the closed-loop PMSM system by feedback control. Using interconnection and damping assignment passivity-based control (IDA-PBC) methodology,...
The hydraulic control system of the diamond wire saw which consists of two types of valves has been established considering the underwater work circumstances. The frogmen can control the start-stop or reversing of diamond string bead wires by using the manual reversing valve and adjust its rotate velocity of radial feed motor by using the governor valve conveniently. It belongs to an open-loop control...
A new backward looking car following model with a consideration of the relative velocity is proposed in a cooperative driving system based on the analysis of the previous models. The stability condition is obtained by the use of the linear stability theory. The stability of the uniform traffic flow is strengthened by the effect of introducing the relative velocity. A numerical simulation is carried...
Circulating cooling water system of high speed wire factory was in trouble for pumps working in higher energy consumption and lower efficiency. The paper analyzed the characteristic of speed water pump. Mathematical model was established with the optimized goal of the lowest energy consumption and it simplified inequality constraint conditions. Immune genetic algorithm (IGA) to handle constrained...
The research is developed and aims at a new clutch using MRF as the transmission medium. Based on the theory of hydrodynamics and the rheology govern equations of magnetorheological fluids, torque transfer model of magnetorheological clutch is derived. The relationships between some designed parameters and outputted torque are analyzed. According to the magnetic circuit design theory, two designed...
Based on the analysis of the wind turbine operation characteristics, the essence of the maximum wind energy tracking problem is transformed into the speed control problem of the generator. For the variable speed constant frequency brushless doubly-fed wind power generation system suffering from the wind energy uncertainties and instability, the model is established, and the disturbance signals are...
The components and work principle of Separate Meter In and Separate Meter Out(SMISMO) load sensing control system are introduced. In the novel system, the traditional proportional valve is replaced by the separate meter in and separate meter out valve element which is used to control velocity of piston in the asymmetric cylinder. Nonlinear simulation model of the novel system is built to study the...
This paper aims at controlling the nonlinear coupled variables force and velocity precisely in the electro-hydraulic proportional system. An open-loop control method based on a certain nonlinear model of force (F), voltage (U) and velocity (V), which is established from formula derivation and experimental data analysis, is presented. The experimental results and applications show that the proposed...
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