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In this paper a novel bidirectional converter for three phase three wire system is proposed. Usually, the converter work as the rectifier. When the BUS voltage exceed the set value, the converter will work as inverter. The feedforward decoupling control is used to optimize the dynamic response and immunity. The voltage loop design function and current loop design function are given. The voltage and...
This paper investigates the performance of the DVR for enhancing voltage dips in medium voltage (MV) distribution networks with secondary distribution configuration. The DVR compensator is analyzed as a rectifier & inverter based voltage controller. Matlab/Simulink modeling of DVR and his control strategy are presented. The DVR performances are compared for different grid connection of the DVR...
First, the basic structure and principle of HVDC power transmission system is introduced briefly. Then, power system (PSB) of MATLAB simulation model for the typical 6 pulse bridge HVDC power transmission system is built. MATLAB/ Simulink to simulate the transient processes of this system when the short circuit faults to ground occur on DC line is also used. It is proved by simulation result that...
A voltage controller for the operation of three-phase single switch boost rectifier is proposed using low cost op-amps. The controller automatically adjusts the pulse width of the boost rectifier to maintain a constant dc load voltage of desired level, despite the variations in the load and source voltage. Methods have been proposed for calculating the duty ratio to obtain the desired dc load voltage...
This paper presents a comparison analysis between two engineering software platforms, Matlab/Simulink & PSIM, which are used as major educational tools in the teaching of power electronics and electrical drive courses, in additional to conducted research in these fields. The comparison analysis is based on studying the design simplicity of the module, time consumed in building of the module, accuracy,...
The fundamental theory and control methods of Active Power Factor Correction (short for APFC) are introduced in this paper. It analyzes and studies the APFC based on the three-phase rectifier. In addition, the simulation model is built on the MATLAB and the results are shown in this paper. The results show that the grids-side input current wave is changed with a sine wave, has the same phase with...
Active and reactive power flow control and power quality improvement of a two level Voltage Source Converter (VSC) based High Voltage Direct Current (HVDC) system operating at fundamental frequency switching is proposed in this paper. Two converter stations used in this HVDC system consists of two level VSC configuration to achieve active and reactive power control with fundamental frequency switching...
Nonlinear phenomena in a closed-loop pulse-width modulated (PWM) buck converter are analyzed. We show three different methods to model the buck converter: a linearized small-signal model, a nonlinear model with a stiff source, and a nonlinear model with a rectified grid source. Using three different compensator gain values that were specifically chosen from a bifurcation diagram, the step responses...
This paper deals with a decoupled electronic load controller (DELC) for an isolated asynchronous generator (IAG), used in constant power pico hydro power generation for feeding three-phase four-wire loads. The proposed DELC is used to control the voltage and frequency in the decoupled manner. The proposed decoupled electronic load controller is combination of a voltage regulator (VR) for regulating...
In this paper, the linear mathematical model of three phase Voltage Source Rectifier (VSR) in d-q coordinates is deduced based on the power balance equation and decoupled state-feedback control method. An improved control strategy using current inner loop with state feedback decoupling, voltage square outer loop and SVPWM modulation is proposed. Nonlinear input transformation is used to derive a linear...
In this paper it will be presented through simulations, the verification and validation of a previously built Matlab/Simulink/Sim-Power-Systems toolbox for a PWM AC-to-DC converter provided with a new line conditioning control strategy, more complex and useful than the actually applied unity power factor rectifier control method. It will be studied the performances of this converter toolbox by applying...
The circuit and corresponding steady state vectors' relationship of single-phase PWM rectifier using IGBTs (insulated gate bipolar transistors) is analyzed, and the mathematic model and controller structure are presented, the PI regulators of the current and voltage loops are designed respectively. The method based on the Matlab/Simulink Blocks is used to carry out the simulation for the control system...
An over modulation strategy for matrix converter (MC) is put forward on the basis of conventional AC/DC/AC MC control theory. At first, fictitious AC/DC rectifier is over modulated to get the greatest dummy DC voltage, then fictitious DC/AC inverter is modulated from linear region to six-step modes seamlessly, which effectively improve the voltage utilization. Voltage transfer ratio under different...
A novel over modulation strategy for matrix converter (MC) is put forward on the basis of conventional AC/DC/AC MC control theory. First, fictitious AC/DC rectifier is over modulated to get the greatest dummy DC voltage, then a novel over modulation strategy was invented for the inverter side, which effectively enhanced voltage transfer ratio to 1.05 with good linearity. At last, the method was extensively...
Numerical simulation methodology based on high frequency mathematical model of high power factor PWM rectifier is proposed in this paper. And input to output transform function is deduced. With the help of input to output transform function, the design method of voltage regulator has been presented. The simulation for three-phase PWM rectifier is implemented with Runge-Kutta, thus comprehensive simulation...
This paper discusses a frequency estimation strategy that, when used in conjunction with dynamic voltage restorer (DVR), can hold the magnitude of any distribution bus voltage constant as the supply frequency varies. First the impact of supply frequency variation on the performance of a DVR is illustrated. It has been shown that if a DC battery supplies the DVR, the battery ends up supplying the real...
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