A three-phase voltage source PWM rectifier(VSR) has some shortcomings that can lead to resonance, resulting in system instability problems. A novel multi-loop control strategy and a design of the control structure in synchronous coordinate system for LCL-VSR is proposed in this paper to solve the problem. The strategy belongs to active damping control, which introduces the filter capacitor current-loop feedback control on the basis of the traditional double-loop control system. The strategy increases the system equivalent damp which effectively inhibited the LCL filter resonance, thus ensure the stability of the system. The proposed strategy system was simulated by using the toolbox of Matlab/Simulink. Finally, the feasibility and effectiveness of the proposed method was verified by simulation results.
Base on the principle of AC chopper, a new digital AC voltage regulating generator is designed by PIC16F716. The IGBT devices are used in the main AC chopper circuit, and the feasibility of circuit is analyzed by PSPICE software. The control circuit of PIC16F716 and drive circuit of IGBT are also described in paper. At last, the AC voltage regulating generator is developed and tested, from the testing results, it can be seen that the AC voltage regulating generator not only has excellent performance of input current and output voltage, but also can control according to the demand of user and loads smartly.
In order to provide theoretical guidance for reducing the electric energy loss of 110kV six-circuit transmission line on the same tower, the factors affecting electric energy loss in overhead ground wires are deeply studied. Firstly, the model of 110kV six-circuit transmission line on the same tower is established in MATLAB. Secondly, the effect of phase sequence arrangements on electric energy loss is studied. Finally, the effects on electric energy loss of varying relative position between two overhead ground wires, horizontal distance and vertical distance among transmission lines are studied. The results show that phase sequence arrangements have a great influence on power loss in overhead ground wire. The inverse phase sequence arrangement is validated to be optimized layout. The electric energy loss is positively correlated with horizontal distance between two overhead ground wires and negatively correlated with vertical distance from overhead ground wires to the ground.
Index Terms--electricenergy loss in overhead ground wires, electromagnetic induction component and electrostatic induction component, horizontal distance of transmission lines, MATLAB, phase sequence arrangement, relative position of two overhead ground wires, six-circuit transmission line on the same tower, the most optimized layout, vertical distance of transmission lines, 110kV
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.