Management and Organisation of Electricity Use Variable Speed Drives Belgrade November 2003

Chapter 6 Management and optimisation of electricity use Part II 2 Variable Speed Drives Content Rationale for use of VSD VSD Configurations VSD Applications Energy Saving Potential Conclusions

Chapter 6 Management and optimisation of electricity use Part II 3 Variable Speed Drives Rationale for Use Motor Controls and in particular Electronic Variable Speed Drives (VSDs) present the largest potential for energy savings in industry The use of VSDs in pumping systems, fans, mixers and compressors has shown substantial electricity savings and process improvements

Chapter 6 Management and optimisation of electricity use Part II 4 Electronic Variable Speed Drives (VSDs) are the dominant speed control technology at present. VSDs are : efficient reliable have reasonable cost able to continuously change the speed of AC motors. VSDs used in variable fluid flow applications show large energy savings. Variable Speed Drives Rationale for Use

Chapter 6 Management and optimisation of electricity use Part II 5 Variable Speed Drives VSD Configurations

Chapter 6 Management and optimisation of electricity use Part II 6 The selection of the optimum VSD system for reducing electricity consumption is a function of several parameters such as :  Torque - speed curve  Power and speed range  Working environment  Load-duration curve  Load Characteristics Variable Speed Drives VSD Configurations

Chapter 6 Management and optimisation of electricity use Part II 7 From fitting VSDs Electricity Savings can vary from ~ 5% to ~ 50% Variable Speed Drives VSD Applications

Chapter 6 Management and optimisation of electricity use Part II Electricity use Primary energy use Saving (%) Reduction in emissions (%) % PJ Summary of projected impact of VSDs in the EU and Norway Variable Speed Drives VSD Applications

Chapter 6 Management and optimisation of electricity use Part II 9 Market barriers of VSDs HIGH INITIAL COST To overcome it :  R&D in advance systems which will reduce the cost of VSDs  Stimulate Market awareness Variable Speed Drives VSD Applications

Chapter 6 Management and optimisation of electricity use Part II 10 Market awareness needs to be stimulated in regard to : l The appropriate use l Their short pay-back period l Their ease of control l Reduced system maintenance l Relatively low system operating costs Variable Speed Drives VSD Applications

Chapter 6 Management and optimisation of electricity use Part II 11 Variable Speed Drives Energy Saving Potential - Pumps

Chapter 6 Management and optimisation of electricity use Part II 12 A Comparison of the two methods of controlling the flow in a pumping system

Chapter 6 Management and optimisation of electricity use Part II 13 Energy savings in ventilation fan systems