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Electric-hydraulic actuators, with their many outstanding features, are widely used in automatic control systems for hybrid vehicle engines. A typical electric-hydraulic actuator consists of fast switching valves and plunger-type hydraulic cylinders. In this article, we first investigate the theoretical properties of electric-hydraulic actuators and develop mathematical models. We then use simulation...
Became automatic-mechanic contact, tap-changing switch does not fit for distributing transformer, almost all distributing transformers adopt no-load voltage-regulating. This paper introduces a distributing transformer which uses power electronic component as tap-changing switch of the transformer and realizes automatic onload voltage-regulating under the control of single-chip. We present the structure,...
Considering that the output voltage of battery will decline during its use, a four-switch buck-boost converter was proposed, which could provide stable output voltage over a wide voltage range of battery so as to extend the use time of battery and enhance its use efficiency. To improve the efficiency, the converter is designed to operate in multiple modes, which controlled by different strategies...
Multilevel neutral point clamped inverter systems are increasingly used in load compensation applications. But, the most significant problem associated with these compensators is the capacitor voltage imbalances and drift due to DC components in the zero sequence current, resulting in degradation of tracking performance of the voltage source inverter. This paper proposes a carrier based PWM control...
This paper discusses design and performance issues of three design techniques for DSTATCOM controller with an aim to improve the robustness. The state feedback controller of DSTATCOM has been designed using linear quadratic regulator (LQR), linear quadratic regulator with prescribed degree of stability and particle swarm optimization (PSO). Weak AC source and unbalanced nonlinear load are considered...
In this paper, the mover speed control of a linear induction motor using sliding mode control design considering the end effects is proposed. Firstly, the indirect field oriented control LIM is derived taking into account the end effects. Then, sliding mode control design is investigated to achieve a speed and flux tracking objective under load thrust force disturbance. The numerical simulation results...
In this paper, the design of variable structure control (VSC) for uncertain discrete systems with time-delays is considered. The original uncertain discrete system with time-delay is simplified to uncertain discrete system without time-delay. Using exponential reaching law, the reason of causing uncertain discrete system without time-delay chattering is given, and using boundary layer, an improved...
This paper investigates the problem of model predictive control for networked multirate control systems (NMCSs) with the output sampling period several times larger than the input updating period. Both sensor-to-controller and controller-to-actuator network-induced delays are considered and are assumed to be upperbounded by one output sampling period. Firstly, using a modified multirate model predictive...
This paper describes a software tool useful for gaining insight into the trade-offs encountered in any control system design and to the benefits of a dual-mode control when needed. The plant is a relatively simple two body problem (two masses coupled with a spring & damper). A GUI interfaces with a Simulinkreg model of the plant and two control options. The GUI makes it possible to switch controllers...
The paper presents the measurements of the switching over-voltages made in the Romanian Power System, at the 400/220/110 kV Urechesti substation at the disconnection of a 400 kV, 100 MVAr shunt reactor type DFAL, Siemens, Germany, in 3 consecutive versions. The first one is for shunt reactor controlled by live-tank oil circuit breaker, the second one is for shunt reactor controlled by SF6 circuit...
Georgia Transmission Corporation (GTC) commissioned the Barrow County Static Var Compensator (SVC) with a continuous rating of 0 to +260 Mvar in June of 2008. This paper presents the northern Metro Atlanta Georgia area transmission system, the requirements for voltage and var support, the dynamic performance study used to verify performance of the SVC, and provides an overview of the SVC design and...
The scheme of the developed Switched Reluctance linear generator system is presented, which is made up of the three-phase 6/4 structure simple side Switched Reluctance linear generator and the three-phase asymmetric bridge power converter. The structure of the Switched Reluctance linear generator is described with the side elevation and the sectional drawing. The three-phase asymmetric bridge power...
With the increase in the number of distributed energy resources and the amount of intelligence in electricity infrastructures, the possibilities for minimizing costs of household energy consumption increase. Household systems are hybrid systems, in the sense that they exhibit both continuous and discrete dynamics. In this paper the mixed-logical dynamic framework is used to construct a dynamic model...
This paper is concerned with the stabilization problem for fractional order chaotic systems. Based on the sliding mode control, a new switching surface involving the fractional integration of the state is proposed to simplify the task of guaranteeing the stability of the closed-loop fractional chaotic system in sliding manifold. An illustrative example of fractional Chua's system is given to demonstrate...
As controls and power electronics have continued to evolve, a new generation of rotating power system equipment has emerged that combines the best elements of both worlds. The combination of rotating equipment, digital regulators, and a small amount of power electronics results in a system solution with higher overload capabilities and better fault ride through characteristics than with the use of...
Planning flexible alternating current transmission systems (FACTS) presents special technical and commercial considerations. More recent applications present additional challenges in systems with deregulated markets. This paper describes some of the successful installations and plans for FACTS in New England.
This paper is on determining a hybrid form of control which has both fuzzy logic control (FLC) and variable structure control (VSC) integrated. This proposed fuzzy variable structure control (FVSC) approach combines the power of approximate reasoning of FLC with the switching synthesis used in VSC. The FVSC is applied to control and stabilize a micro satellite in space. A model of satellite is used...
Multi-rate simulation techniques offer advantages to the computer simulation of large scale dynamic systems. Each part of the system is solved using the most appropriate time step and numerical integration method. The approach can be particularly advantageous in real-time applications, where it is essential to complete each set of calculations in the allotted real-time interval. The ESL simulation...
The supervision and control system (SCS) of research reactors integrates a number of units that categorized into three processing levels: field, control and supervision. These processing levels are interconnected by communication networks to achieve data transfer between different units. These networks are industrial control networks and hence the control data are required to be delivered in real-time...
Resolving imbalances on phases is performed using conventional trial and error approach which involves service interruption. Phase current and voltage may improve however the resultant effect does not last for too long. To improve the performance of the secondary distribution system there is a need for an on-line and automating technology. The aim of this paper is to pioneer a method and technology...
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