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Proportional-integration (PI) controller scheme is implemented to control the phase voltage of the customer-end single-phase inverter in a low-voltage DC (LVDC) distribution system. In the inverter output, the LC-filter is used. In order to avoid resonances caused by the filter, the feedback and the feedforward filteration is used. It is shown that basic PI control system cannot drive the steady-state...
Knowledge of load characteristics and load modeling is a necessary tool for adequate voltage stability analysis. This paper presents experimental tests of an off-the-shelf variable frequency drive feeding an induction motor and shows how this load draws power from the grid and its effect on the voltage stability. A description and simulation of the drive is provided to understand the input and output...
This paper is concerned with the design and simulation of a pulse width modulation (PWM) rectifier for three-phase Permanent Magnetic motor drive. Based on the mathematical model of PWM rectifier, the dual-close-loop engineering design with decoupled feed-forward control is applied in the 3-phase voltage source rectifier. The objective to be reached is to realize unity power factor at the input ac...
With advancement of recent high-speed switching devices, PWM inverters are operated in high frequencies and often generate EMI noises due to common-mode leakage currents. There are mainly two types of leakage currents. One is inverter leakage currents due to parasitic capacitances between switching devices and heat sinks. The other is load leakage currents due to parasitic capacitances between the...
A new controller for a dynamic voltage restorer (DVR) is proposed in this paper. The controller allows minimisation of DVR injected active power, and stabilisation of DC side voltage. It allows also recharging a DC side using no extra recharging circuit. The controller works according to the progressive phase advance strategy, and since it does not require complicated numerical computations, the controller...
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