Armands Senfelds

Power smoothing approach within industrial DC microgrid with supercapacitor storage for robotic manufacturing application

This research paper cover optimization process a converting conventional AC supply system towards DC based industrial power distribution system with supercapacitor storage based power balancing functionality. Electrical power consumption reference data is based on 4 industrial robot manufacturing area with automotive industry specific production processes and respective electrical load examples. Improvement in energy efficiency by interconnection and energy exchange process of production equipment as well as peak loading reduction on supplying AC power grid infrastructure is demonstrated.

Power converter for DC bus sharing to increase the energy efficiency in drive systems

It is state of the art for many drive systems like those used in industrial robotics, conveyor systems or diverse numerical control machinery to have a common DC bus power system architecture. Due to regenerative braking, the DC bus voltage increases until a certain limit, which is limited means of a balancing resistor (brake chopper). Systems that require rapid cyclic starts and stops are subject to significant energy waste due to extensive use of the brake chopper. In this article, a novel power converter for drive systems is proposed that allows the brake chopper to be omitted and enables the exchange of regenerative energy among multiple drive systems within an independent DC subgrid with one centralized energy storage element. The solution does not require identical hardware or exact synchronization between the drive rectifiers, therefore it is applicable to both existing and new production equipment alike. Experimental results in industrial robot drives show savings of up to 20%.

Design of a motor drive system for bidirectional DC power flow control

A motor drive system for the purpose of bidirectional DC power flow control has been developed. A laboratory test bench has been setup to determine the dynamic properties of the system and to verify the proposed power flow control principle. Control board prototype has been developed and briefly described. Results of full reference power cycle tests have been summarized.

Electrical drive DC link power flow control with adaptive approach

An objective to control power flow in intermediate DC link of typical induction drive converter has been introduced and respective drive setup intended for such task. Theoretical considerations and simulation results of control approach utilizing available drive controller capabilities like direct torque control and speed control, as well as introduction of additional adaptive funnel type controller has been presented. Modifications of introduced adaptive control method have been presented and evaluated by simulation. Simulation results support proposed idea of DC link power flow control.

Analytical approach for industrial microgrid infeed peak power dimensioning

Method of estimating optimal power supply performance parameters with comparison of two different power measurement data analysis methods is introduced. Application of estimating optimal infeed supply converter performance parameters for industrial DC microgrid with multiple DC supplied industrial manipulators and an spot welding process has been analyzed.

Power Measurement and Data Logger with High-Resolution for Industrial DC-Grid Application

Abstract Power and energy measurement and monitoring is a key factor for many industries in terms of energy and cost efficiency evaluation. Due to trends of Smart Grid concept application in industrial environment, including decentralized DC-Grid implementation, for precise evaluation – faster and low-cost measurement equipment is needed. Manufacturing industry widely uses industrial robots that have dynamic load characteristics for which faster measurement equipment is needed. This paper gives a brief description of the developed power measurement equipment, its structure and interconnection with industrial Profinet network. Further as a testing method steady state and dynamic loads are selected and analyzed. For testing, specially created industrial DC-Grid testing environment and equipment was used. Testing results show that the selected method and idea is working and is able to measure dynamic loads with high resolution. For other industrial load types there is a discussion going on about the issue of how detailed the resolution is needed in industrial SmartGrids, as energy forecast is a new trend in robotic industry and manufacturing planning.

Modelling of AC/DC power supply unit for DC microgrid

This paper report about modelling approach based on basic experimental measurements of bidirectional AC/DC converter. Modelling of existing AC/DC power converter has been seen in context with development of DC microgrid supply system where operational efficiency and DC side voltage stability are seen as primary tasks for individual component modelling within interconnected system.

Analysis of cyclic DC load currents for intelligent electrical protection

Conceptual analysis of repetitive current of DC load is presented for two type of data processing approaches. Offline post-processing type approach as well as online adaptive data analysis method is introduced. Application of introduced analysis in case of repetitive DC current cycle with fixed duration is presented focusing of current-time behavioral investigation. Comparison of obtained analysis data and typical fuse character curve data is presented followed by brief discussion of prospective advantages.