Applied Mechanics and Materials Vols. 530-531

Abstract: To the question of networked control system with random time-delay in both forward and feedback channels, a new class of Smith predictor combined to Fuzzy PID control is presented. It sets up a new Smith forecast model and designs the parameter self-tuning fuzzy PID controller. The results of system simulation using MATLAB show that the network control system of the proposed scheme has better dynamic and stability, and in the case of model miss-matching has high robustness.

Abstract: In order to maximize the match between the output of the Hybrid Wind/Photovoltaic/ Energy storage System and the scheduling curve,the article takes the measure that optimizes and controls the energy storage device one day ahead.Due to the fuzziness of the wind and photovoltaic output, the optimal control method of energy storage is proposed based on a fuzzy dependent-chance programming theory. This method considers the constraints of the energy storage device including the power output and energy constrain, and the matching degree of each time is represented by credibility value.So the final goal is maximizing the mean value of the total credibility within a day of 96 periods.The genetic algorithm based fuzzy simulation is used to solve the model,then we can get the different periods of energy storage charge and discharge power corresponding to the credibility of maximum mean value.

Abstract: Steam manage system is a great delay system. The optimum design is necessary to ensure its speed response, quick follow in concrete system. The paper introduces optimizing digital controller design principle, and builds transfer function of pure lag system and constitutes modal of control system. Based on introducing the dynamic characteristics of the steam treatment system, analyzing the character of object function and determines it, and system emulation is put up on known object function and PID controller is confirmed. Experimental emulation proves the objective function, overshoot and adjustable time of dynamic response have effectively improved in optimized system, and the optimum design of the system is significant by comparing optimized system with unoptimized system.

Abstract: Hydraulic electromagnetic energy-regenerative shock absorber (HESA) which used one permanent magnet synchronous motor (PMSM) as actuator to regenerate energy is introduced in this paper. Mathematic model which transform a three phase time and speed dependent system into a two co-ordinate time invariant system is presented. To obtain better dynamic performance, simulation models on a PMSM with field oriented control (FOC) have been carried out. Rapid torque response and stable dynamic performance are verified through the simulation results.

Abstract: Good settling properties of red mud are one of what contribute to smooth production of alumina. Many manufactories still adopt manual control on taking quantitative flocculants to control clarity of clear solution. This paper mainly studies a Genetic Algorithm-based adaptive fuzzy control device based on fuzzy control and genetic algorithm, and also focus on analyzing adaptive fuzzy control of clarity of clear solution, through the test of overflow, baseflow and a flocculants addition as adjustment method. From the results of control, the system can get a better control response, which satisfies the requirements of practice works, compared with ordinary PID control.

Abstract: This paper introduced a new modular multi-level converter (MMC), which could enhance the voltage and power level by sub-converter modules in series and was easy to extend to any level of output. Its structure and working mechanism were described. By analyzing the performance of STATCOM based on MMC working conditions in the reactive power compensation, this paper studied compensation control theory in reactive changing conditions. To obtain compensation control response speed faster and better compensation effect, a compensation control strategy was proposed based on direct current control mode. The simulation results show the strategy has a better tracking precision and response speed for the reactive power compensation.

Abstract: Aimed at the finite-time stabilization problem of a class of flexible manipulators, a stabilization controller based on terminal sliding mode control was proposed in this paper. Firstly, the nonlinear model of flexible manipulators was transformed into linear system through the exact state feedback linearization. Based on the finite time stabilization control method of the linear system, a stabilization controller based on terminal sliding mode control was designed for the flexible manipulators. Furthermore, it was proved that all the states of flexible manipulators could be stabilized to equilibrium in finite time with the proposed controller. The simulation results showed that the performance of the flexible manipulators with the proposed finite-time state feedback controller was effective. At last, the analysis and comparison of the proposed controller and the finite-time state feedback controller were given.

Abstract: This paper introduces the characteristics of VB and Matlab and the method to visit Matlab in VB, and combines the examples of control system showing that this method not only has good interface and is convinent to use, but also students can deepen the understanding and grasping for theory of control and can apply to other systems at the same time.

Abstract: This paper analyzes the instantaneous value of the three-phase circuit measurements of various parameters and the key issues to be addressed , to design a new type of intelligent SOPC based on a permanent magnet vacuum circuit breaker control system. FPGA-based NIOS II as the main processor , the more traditional micro-controller with a higher data processing speed and strong expansion capability to effectively meet the electricity system fast data processing capability and high real-time requirements . And with a powerful FPGA logic functions to achieve internal switch control section and the hardware of the control program , than the direct control of the processor using software implemented with higher reliability and noise immunity . The intelligent control system hardware to EP2C35F672C6 core processor,mainly for failure to protect the real-time data acquisition and processing and circuit breakers,real-time display of current or fault line running information, the intelligent controller to achieve two-way communication with the PC function , via the bus system to reach remote remote adjustment, the purpose of the remote control , making the performance of intelligent controller is enhanced to meet the requirements of the distribution system , which provides protection for the safe operation of power system reliability .

Abstract: Many real systems such as inertial measurement unit (IMU) in vibration environment, avionic systems in flight tests, half car dynamic model in rid comfortable test and suspension design…etc. can be expressed as Two-inputs-two-outputs (TITO) system for more realistic analysis than single-input-single-output system (SISO); but with more additional complexities. Comparing Transfer Matrix Method for multibody systems (MSTMM) with classical dynamic methods has preferences of modeling flexibility, low order of system matrix, and high computational efficiency, without necessity of deriving the system’s global dynamic equations. The need of combining control strategies with MSTMM becomes an issue of paramount importance due to that a lot of systems are considered as multibody systems, some need control to obtain higher accuracies requirement, vibration isolation treatment, …etc. As a rule of thumb the concept of designing vibration isolator in one field can be applied in many other fields. In this article a generalized TITO model is analyzed using MSTMM to deal with the vibration problem via an active isolator for both vertical translation and pitch responses. Active isolation is applied via Proportional-Integral- Derivative (PID) controller to prove the capability of formulating a relationship between MSTMM and well-known control methodologies to mitigate vibration effects. For verification purpose the analyzed model is verified using data for half car model and standard formulae for road models input excitation test. The achieved results declared that MSTMM can be combined with control techniques without need of special treatments or preconditions for different models with the advantages of MSTMM. This article allows wider developed control applications to use MSTMM simple application for more complex systems models. Dilatation in studying controlled systems using MSTMM provides a possibility for incoming control applications because of the good dealing of MSTMM with the increased complexities of multi-rigid-flexible-body problems.