https://www.mdpi.com/2218-6581/6/4/39/pdf

A Review on Energy-Saving Optimization Methods for Robotic and Automatic Systems

A vector control scheme is presented for a three-phase AC/DC converter with bi-directional power flow capability. A design procedure for selection of control parameters is discussed. A simple algorithm for unit-vector generation is presented. Starting current transients are studied with particular emphasis on high-power applications, where the line-side inductance is low. A starting procedure is presented to limit the transients. Simulation and experimental results are also presented.

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Vector control of three-phase ac-dc front-end converter

A variable frequency drive comprises a diode rectifier receiving multiphase AC power from a source and converting the AC power to DC power. An inverter receives DC power and converts the DC power to AC power to drive a load. A link circuit is connected between the diode rectifier and the inverter and comprises a DC bus to provide a relatively fixed DC voltage for the inverter. A bus capacitor is across the bus. A soft charge circuit limits inrush current to the bus capacitor. The soft charge circuit comprises an inductor connected between the source and the link circuit and a switch circuit in the link circuit for selectively providing a semiconverter configuration or a full bridge converter configuration to provide two stage charging of the bus capacitor.

Low stress soft charge circuit for diode front end variable frequency drive

A variable frequency drive comprises a diode rectifier receiving multiphase AC power and converting the AC power to DC power. An inverter receives DC power and converts the DC power to AC power to drive a load. A link circuit is connected between the diode rectifier and the inverter and comprises a DC bus to provide a relatively fixed DC voltage for the inverter. A link capacitor is across the bus. A soft charge circuit limits in rush current to the link capacitor. The soft charge circuit comprises an inductor in the bus and a resistor assist circuit across the inductor along with an anti-parallel clamping thyristor reverse connected also across the inductor.

Variable frequency drive soft charge circuit

This paper is devoted to investigation of shared D C bus systems with a common storage capacitor operati ng on utilization of regeneration energy of electrical drives of industrial robots. The system connecting the central energy storage capacitor with DC buses of several industri al robot controllers is elaborated. Simulation of operation of such system has been done with a target to obtain some specific ndicators about efficiency of the system by varying number of shared DC buses. Dimensioning of system’s parameters is prese nt d as well as conclusions about necessary control principles a re given. Results of experimental investigation are presented confirming operational efficiency of the proposed system.

Utilization of Regeneration Energy in Industrial Robots System

The shared/common bus operation of AC motor drives is becoming popular in many industrial applications due to its advantages such as cost reduction, reduced space requirements and improved reliability. Depending on the application requirements, there are presently two methods to interconnect DC buses of AC drives: shared-bus; and common-bus. Very little or no work has been done in analyzing the use of such system configurations in industrial applications. This paper analyzes the different shared/common bus configurations in precharging, motoring and regenerating and addresses how to select the components, and connect the system together to ensure trouble-free operation, using PSpice simulations.

R. Lukaszewski

Papers

Modeling and analysis of shared/common DC bus operation of AC drives. I