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This paper presents the usage of discrete-time sliding mode control (SMC) algorithm based on disturbance observer in multi-area interconnected power systems. Compared with other schemes, sliding mode control not only can reduce large overshoots, which occurs at the instant of the step change of parameters, but also its control law is easy to implement. The disturbance observer can estimate uncertainties...
This paper investigates the sliding mode control of three-phase voltage source PWM rectifier (VSR). When the three-phase VSR system is applied in different environmental conditions, external disturbances are inevitable and stochastic, so these conditions should be taken into consideration when designing the controllers. To have a good performance and a fast response, the whole closed loop control...
When wave power system using BDFG operated in islanded mode, the unbalanced loads condition should be taken into consideration in the control system, otherwise it will cause active, reactive power and electromagnetic torque fluctuations because of civil electricity. In this paper, the model of BDFG with unbalanced loads is deduced based on symmetrical component theory, the impact of negative sequence...
As a feedforward control strategy, iterative learning control (ILC) is used to track a pre-defined reference and reject repetitive disturbances iteratively, but it is incapable of compensating for non-repetitive disturbances. Thus, ILC is often combined with a well-designed feedback controller. Considering nonlinear process, this paper presents an integrated ILC and on-line model predictive (MPC)...
The boiling process is a multivariable nonlinear system with strong interactions and input constraints. In this paper, a multivariable PID control with feed-forward compensation is designed for a benchmark boiler control problem, where the boiler model is proposed in an IFAC Conference and can be used as a benchmark for various control methods. The proposed PID controller is obtained as a result of...
Electrification of the transportation sector is gradually becoming a global trend due to the environmental benefits of electric vehicles (EV), which not only helps to reduce greenhouse gas emissions, but also helps to reduce the burden of fossil fuel resources need. In order to analyze and evaluate the performance of different EV charging station location schemes, a pre-built AnyLogic Urban Dynamics...
A session-based admission time ratio (ATR) feedback control mechanism is introduced in order to the control Internet load pressure. An auto-regressive moving average (CARIMA) system is described as the Internet load pressure model. The Model Reference Adaptive Controller (MRAC) based on feedback control and feedforward compensation is designed to adjust ATR, and feedback controller is used to statue...
Island operation of a fraction of power distribution network with distributed generators (DGs) is considered an efficient operational paradigm to enhance the security of power supply. This paper attempts to address the issue of island partitioning in distribution network with the penetration of small-scale DGs and present a two-stage algorithmic solution. In the suggested solution, the CSP-based method...
A new fault diagnosis method for rolling element bearing is proposed based on empirical mode decomposition (EMD) and fisher discriminant analysis (FDA). First, non-stationary vibration signals are processed by applying EMD technique, and stationary IMF components are obtained. Then, fault feature vectors with the moving time-lagged windows are composed using the absolute values of IMF components of...
By using finite-element analysis theory, we divided wheat into a finite number of units and assumed the displacement of joint between units as unknown, building the lodging-resistant mechanical model of wheat. Combining with the model analysis method, we calculated steady state response caused by harmonic load excitation and analyzed the maximum displacement of wheat spike at certain wind scale, thereby...
This paper utilized multi-degree of freedom vibration theory combined with considering the influence of synergy of wind load and self-weight on the wheat to build the five-degree of freedom mechanical model of wheat and calculated the lodging bending moment of wheat root under a certain wind scale, in response to lodging problem in the late period of wheat development. Because of the complicated distribution...
Cogeneration system isnonlinear, wide range of operating regime, and multivariate. The generating efficiency and thermoelectric conversion coefficient of turbine generator are affected by many factors such as load variation, extracted steam change, and unstable supplied power etc. In this paper, a statistical model identification algorithm has been proposed to build the model of generating efficiency...
This paper proposes a cyclic scheduling method for cluster tools in semiconductor manufacturing with equipment front-end module and multifunctional load locks. In this special configured cluster tools, the equipment front-end module consists of an aligner, a signal-arm robot, and two load locks integrated with coolers. Hence, the two load locks both have multifunction of filling, pumping, and cooling...
Simulation model of micro-grid including a direct-drive wind power generation, two sets of power-controlled distributed generations (DGs) and a three-phase fault module was investigated in Matlab/simulink. Based on the constructed model, the operating process switched from island mode to grid-connected mode was simulated and the voltage variance signal was detected with Daubechies(Db) wavelet. The...
Distributed energy resources and energy-storage units are parallel connected through converters in a DC bus microgrid. Current sharing is a basic requirement for microgrid and many current sharing methods are proposed. Distinct from those methods like the average current method, centralized method and master-slave method, the droop control method does not need any interconnections between the converters...
Electric power market will transform to the free market based on real-time pricing and the traditional clients will change to smart clients with the development of Smart Grid. A smart client model which includes general loads, energy storage devices, electric vehicles and distributed generations is developed in this paper to study the demand-side response under real-time pricing. MS_VND algorithm...
Based on fixed switching frequency, a space vector modulation method is designed in order to reduce the harmonic pollution and improve the power factor of power rectifier devices. The modules for simulating algorithm and control are designed in Matlab environment. Results of simulation tests show that this modulation method can improve the utilization rate of system's DC (Direct Current) voltage,...
In this paper, a micro grid price mechanism is discussed and optimised. Operators can increase the consumers's profile under step-price environment. With a novel low-carbon strategy designed in this paper, consumers make ones own decision whether to buy or sell energy with what price. By using this strategy, energy distribution can be optimised and the utilization of clean power will increase. A simulation...
A hybrid isolated microgrid is proposed, including PV power, diesel generator system, load and other subsystems.. Based the equivalent circuit and output characteristics of photovoltaic cells, PV model has been established and maximum power point tracking(MPPT) has been implemented to make full use of solar energy. Diesel model has been established, base on it PID load frequency compensation control...
Wet air oxidation (WAO) technologies developed in the fifties of last century who treats the waste water with a high temperature and high pressure. In the late 50 years, it is widely used dispose the non-biodegradable organic waste water, the waste water with high concentration or refractory sludge. In according to large amount of oxygen generated by fossil energy power should be supplied for system...
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