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Software Aspects of PQ in a DG Context

Software Aspects of PQ in a DG Context. By Dr. Siri Varadan. Overview. Introduction PQMS Basic Components of a PQMS Modular System Design Benefits Functional Design Data Flow, Analysis, Reporting DG Specific Applications Conclusions. Power Quality Monitoring Systems.

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Software Aspects of PQ in a DG Context

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  1. Software Aspects of PQ in a DG Context By Dr. Siri Varadan

  2. Overview • Introduction • PQMS • Basic Components of a PQMS • Modular System Design • Benefits • Functional Design • Data Flow, Analysis, Reporting • DG Specific Applications • Conclusions

  3. Power Quality Monitoring Systems • Integrated systems of several PQ monitors are being set up • increasing number of monitors • emerging computer technologies on hardware and software area • different architectures that serve all PQ monitors with a single large database • client-server • Intranet/Internet

  4. Power Quality Monitoring Systems • Advantages • efficient and fast analysis of large volumes of data • establish centralized PQ data • usage of standard PQ indices within the utility • standardization of customer complaint evaluation • modular, expendable and portable system design • reduction in system maintenance and expansion costs • standard data analysis tools on LAN/WAN, Intranet, etc. • centralized security system

  5. Main PQ Monitoring System Components • Communication System - physical media (fibre optics, copper, wireless, etc), modems (DSL, telephone, etc.), Ethernet network components (switches, routers, etc), etc. • Information Technology (IT) System - computers (data servers, polling stations, client stations, etc), system software (operating system, etc), database system, protocol converters, user applications (GUI, analytical applications, alarm and information dispersal software, web publishing, etc.), etc.

  6. Main PQ Monitoring System Components • Monitoring System - instrumentation (PQ monitors, RTUs, sensors, etc), data retrieval and configuration software, etc

  7. PQ Monitoring System Components Monitoring system Polling server Database/Application server ODBC database IT system Communication system WAN End users PQ Monitors

  8. Modular System Design - Benefits • Removes vendor dependencies - The best alternatives, specific to meet all of the utility’s requirements, are used • Easy implementation of analysis applications • Analytical applications can be written that use the ‘standardized databases • Industry standard and vendor independent applications, each best suited to meet utility’s requirements

  9. Modular System Design - Benefits • Ease in implementation of web reporting applications - Latest web hosting and interactive site technologies can be used. • Economic benefits - With several alternative systems, price of the individual modules is more competitive

  10. Modular System Design - Benefits • Maintenance of a standard database • Allows cheap and regular maintenance. Facilitates easy database expansion. Single database ensures that there is no duplication of data from all current and potential future power quality monitors. • Existing trained personnel can quickly come up to speed with the operation & maintenance of the system - No new elaborate training is necessary

  11. Modular System Design - Benefits • Future subsystem components can be selected solely on their merit - ‘Vendor-independence’ • Modular design allows • utilization of future advances in instrumentation, communication, and software technologies • utilization of upgrading without a major investment in a complete system overhaul

  12. Conceptual Design • Future expandability; plug-and-play concept Instrumentation Database Required software - Communication - Data logging - Configuration Meter server Database server LAN End user Fiber Optics and DSL modems Leased Lines or other media Current PQ meters Future PQ meters

  13. Functional Design

  14. F 3 component analysis Data from Harmonic Communication server analysis Web reporting ‘Basic’ software is installed on the ODBC Communication server Application database server Event reporting PQ characterization Independent software modules, each of which Import/Export of data can be modified/upgraded to other formats independently ( PQDIF , COMTRADE , etc) Software Modules

  15. Data Flow

  16. Data Analysis and Reporting

  17. Data Analysis and Reporting • Calculation Modules • RMS, Root Mean Square, (voltage or current) • SARFI • Fundamental voltages and currents of Fourier series • Total voltage harmonic RMS, etc. • Expert system rules constitute a simple if-and-then logic for combining windowed time data with relational and topological data • Extract module basically extracts the required portion of the data from database tables • Display is in the form of graphs, tables and text

  18. DG Specific PQ Applications ? • Event Aggregation • Use of Intelligent schemes for post-processing • Centralized data analysis • Cross-communication between different measuring units for real-time diagnostics; classification etc.

  19. DG Specific Needs • Protection issues – How and what caused the problem? • Potential conflicts with PQ design and DG objectives • Operational conflicts • Ability to analyze conditions leading to resonance etc.

  20. Conclusions • Modular – system components can be changed without major modifications • Expandable – new monitoring systems can be added without a complete system overhaul • Easier to maintain • Standard unified set of tools across the users • Customizable PQ applications with DG systems

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