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With introduction of recent standards on limiting harmonic pollution of electrical power distribution system, three-phase PWM converters are being considered as prime candidates for interfacing high-power electronic equipment to power supply lines. In these applications, converters can provide input currents without distortion and with unity power factor. In this paper, a unified discrete event model...
This paper examines the implementation of a Phase Locked Loop (PLL) for obtaining the phase angle information of three-phase grid. The paper compares techniques previously employed to implement the PLL and provides their merits and demerits. A bang-bang type PLL has been designed and implemented in a Digital Signal Processor (DSP) so as to ensure that the PLL continues to function during severe grid...
How to solve power quality problems is a research focus recently. It's of great significance to research and design the voltage disturbance device for the voltage compensation device's development and various experimental verifications. The all-digital controller is based on DSP and FPGA. The human-computer interface is designed by LabVIEW, a graphical software development environment most widely...
This paper deals with a new PWM control scheme of matrix converters, which have been proposed by the authors. The PWM control scheme is characterized by the calculation algorithm using pseudo inverse and the performance that the output voltage can be controlled completely even if the input voltage is distorted. An experimental system, which consists of a matrix converter main circuit and a control...
Three phase three level neutral point clamped (NPC) rectifier is a popular topology for power converter front-ends to achieve controllable DC voltage. In this paper, its mathematical model is analyzed and a dual-loop control strategy is adopted to regulate both DC voltage and input power factor. Instead of space vector PWM, an improved multi-level carrier based PWM is presented. The control system...
This paper presents a FPGA-based digital control for a DC-DC converter. The main difference from DSP-based solution is that FPGA allows simultaneous execution of all control procedures, enabling high performance and novel control methods. The control algorithm has been developed using a VHDL language or CAD state graphical approach based on the use of logical state diagram. The FPGA switching controller...
Present paper describes the design of a doubly fed induction generator (DFIG) test bench with active crowbar, using a PWM voltage-fed inverters connected between the grid and the rotor. A vector control scheme is proposed in order to control the power-side and the rotor- side of the converter. A control board, based on a digital signal processor (DSP) and a FPGA, has been developed to manage the overall...
This paper deals with three-phase direct matrix-reactance frequency converters (MRFC) based on unipolar PWM AC matrix-reactance choppers (MRC). Each MRC with conventional topology has two synchronous-connected switches (SCS) sets. In the MRFC, unlike the MRC topology, one of SCS sets is replaced by a matrix-connected switches (MCS) set in order to make possible of the load voltage frequency change...
Nowadays, most digital control for motion and power electronics systems are based on DSPs. This paper presents a FPGA-based digital control for a DC-DC converter. The main difference from DSP-based solution is that FPGA allows simultaneous execution of all control procedures, enabling high performance and novel control methods. The control algorithm has been developed using a VHDL language or CAD...
A simple procedure is proposed in this paper for eliminating harmonics in the load voltage of stand-alone single-phase inverters, while supplying non-linear loads. An observer has been designed for estimating the fundamental component and hence the harmonics present in the load voltage. Assuming that the Inverter could be modeled as a feed back control system with the fundamental component as the...
The paper presents adjustable speed generation systems and their parallel operation. The adjustable speed generating set consists of diesel engine, driving permanent magnet axial flux generator and power electronic converter with DSP - FPGA based control unit. The power electronic converter, with intermediate a DC link voltage, converts variable frequency and -amplitude of the voltage, produced by...
A new duty cycle parallel control method for AC-DC converter with power factor correction is proposed. The duty cycle required to achieve unity power factor consists of two terms: current term and voltage term. They are calculated directly based on the reference current and sensed inductor current, input voltage and output voltage. It requires only one multiplication and three addition operations...
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